Network, Networking Technology, Data Communication Terms, Glossary and Dictionary

Numbers A B C D E F G H I J K L M N O P Q R S T U V W X Z

Numbers

• 1000BaseCX or 1000Base-CX
• 1000BaseF or 1000Base-F
• 1000BaseLH or 1000Base-LH
• 1000BaseLX or 1000Base-LX
• 1000BaseSX or 1000Base-SX
• 1000BaseT or 1000Base-T
• 1000BaseX or 1000Base-X
• 1000BaseZX
• 100BaseFX or 100Base-FX
• 100BaseT or 100Base-T
• 100BaseT4 or 100Base-T4
• 100BaseTX or 100Base-TX
• 100BaseX or 100Base-X
• 100VG-AnyLAN
• 10Base2 or 10Base-2
• 10Base5 or 10Base-5
• 10BaseF or 10Base-F
• 10BaseFB or 10Base-FB
• 10BaseFL or 10Base-FL
• 10BaseFP or 10Base-FP
• 10BaseT or 10Base-T
• 10Broad36
• 10GBase
• 10GBASE-CX4
• 10GBASE-E or 10GbE
• 10GBase-ER
• 10GBase-EW
• 10GBASE-L
• 10GBASE-LR
• 10GBase-LW
• 10GBASE-LX4
• 10GBASE-S
• 10GBase-SR
• 10GBase-SW
• 10GBASE-T
• 10GBase-ZR
• 10GEA: 10 Gigabit Ethernet Alliance
• 2B1Q
• 3.1 Khz Audio Bearer Service
• 4B/5B or 4B5B
• 50-Pin Telco
• 6bone
• 802.x
• 802.2
• 802.3
• 822
• 8B/10B or 8B10B
• 8-Bit Clean

A

• AARNet: Australian Academic and Research Network
• AARP Probe Packets
• ABC Compliance / Conformance
• ABR Compliance / Conformance
• Abilene Network
• ABM: Asynchronous Balanced Mode
• Abort
• ABR: Area Border Router
• ABR: Available Bit Rate
• ABRD: Automatic Baud Rate Detection
• ABS: Application Bridge Server
• Absolute Address
• Access Device
• Access List
• Access Method
• Access Server
• ACCESS.bus (A.b)
• Accounting
• ACF/NCP: Advanced Communications Function/Network Control Program
• ACF: Admissions ConFirmation
• ACF: Advanced Communications Function
• ACK: Acknowledgment
• ACO: Alarm Cut-Off
• ACOM: Acombined
• ACR: Allowed Cell Rate
• ACS: Asynchronous Communications Server
• ACSE: Association Control Service Element
• Activation
• Active Discovery Packet
• Active FTP
• Active Hub
• Active Monitor
• Active Directory 
• Active2
• ACUTA: Association of College and University Telecomm Administrators
• ACX: Asynchronous Cross-Connect
• AD: Administrative Domain
• Adaptive Routing
• Adaptive switching mode
• Add Pass Request
• Address
• Address Aging Period
• Address Bus
• Address Mapping
• Address Mask
• Address Resolution
• Addressed Call Mode
• ADF: Adapter Description File
• Adjacency
• Adjacent Nodes
• ADM: Add/Drop Multiplexer
• ADMD: Administration Management Domain
• Administrative Distance
• Administrator
• ADP: Automatic Data Processing
• ADPCM: Adaptive Differential Pulse Code Modulation
• ADSL Modem
• ADSL: Asymmetric Digital Subscriber Line
• ADSU: ATM DSU
• ADTF: ACR Decrease Time Factor
• Advertising
• AE: Application Entity
• AERM: Alignment Error Rate Monitor
• AES47
• AFCEA: Armed Forces Communications and Electronics Association
• Affinity Bits
• AFI: Authority and Format Identifier
• AFNOR: Association Francaise de Normalisation
• AFS: Andrew File System
• Agent
• AI: Artificial Intelligence
• AIM: AOL Instant Messaging
• AIM: Asynchronous Interface Module
• AIO: Asynchronous Input/Output
• AIP: ATM Interface Processor
• AIR: Additive Increase Rate
• AIRF: Additive Increase Rate Factor
• Alarm
• Alberta Supernet
• ALG: Application Level Gateway
• Algorithm
• Alien Port Adapter
• Alignment Error
• All-rings Explorer packet
• All-routes Explorer Explorer Packet
• ALO transaction
• Alphanumeric
• ALPS circuit
• ALPS: Airline Product Set
• Altivore
• AMBA: Advanced Microcontroller Bus Architecture
• Ambient network
• AMIX: American Information Exchange
• ANN: Artificial neural network
• Anonymous P2P
• Anycast
• Apache
• APaRT: Automated Packet Recognition/Translation
• APIPA: Automatic Private IP Addressing
• APP Server
• APPC: Advanced Program-to-Program Communication
• Applejuice
• Appletalk call filter
• Application Layer
• Application Layer Firewall
• Application Level Gateway
• APPN: Advanced Peer-to-Peer Networking
• APPN+
• APR: Automated Packet Recognition
• APS: Automatic Protection Switching
• AR: Access Registrar
• ARA: AppleTalk Remote Access
• Arbitrated Loop
• ARC: ATM Research Consortium
• Archie
• Architecture
• ARCNET: Attached Resource Computer NETwork
• ARDRT: ABR Rate Decrease Response Time
• Area
• ARIN: American Registry for Internet Numbers
• ARIRT: ABR Rate Increase Response Time
• ARJ: Admission ReJection
• ARM: Asynchronous Response Mode
• ARNES: Academic and Research Network of Slovenia
• ARPA: Advanced Research Projects Agency
• ARPANET: Advanced Research Projects Agency Network
• ARQ: Admission ReQuest
• ARQ: Automatic Repeat reQuest
• ARU: Alarm Relay Unit
• AS: Autonomous System
• ASAM: ATM Subscriber Access Multiplexer
• ASBR: Autonomous System Boundary Router
• ASCII Armor
• ASCU: Agent-Set Control Unit
• ASI: ATM Service Interface
• ASIST: Application Software Integration Support Tools
• ASP: Auxiliary Signal Path
• ASPI: Advanced SCSI Programming Interface
• Assigned Numbers
• AST: Automatic Spanning Tree
• ASTA: Advanced Software Technology and Algorithms
• Asymmetry
• Asynchronous
• Asynchronous PPP
• Asynchronous transmission
• ATG: Address Translation Gateway
• ATM Access Switch
• ATM Address
• ATM ARP server
• ATM Backbone Switch
• ATM Cell
• ATM Edge LSR
• ATM Edge Switch
• ATM ELSU: ATM Ethernet LAN Service Unit
• ATM Endpoint
• ATM Forum
• ATM Forum UNI
• ATM Inverse Multiplexing
• ATM Link
• ATM LSR
• ATM NIC (Network Interface Card)
• ATM Peer-to-Peer Connection
• ATM Reference Model
• ATM Switch
• ATM Token Ring LAN Service Unit (TLSU)
• ATM Traffic Descriptor
• ATM user-user connection
• ATM25 or ATM-25
• ATMM: ATM Management
• Attenuation
• Attribute
• AU: Access Unit
• AUI: Attachment Unit Interface
• AUP: Acceptable Use Policy
• AURP Tunnel
• AUSM: ATM UNI Service Module
• AUSTPAC
• Authority Zone
• AUTODIN: Automatic Digital Network
• Automatic Routing Management
• Auto-Negotiation
• Autonomous Confederation
• Autonomous Switching
• Autonomous System
• Autoreconfiguration
• Availability
• Avalanche
• Average Rate
• AVVID: Architecture for Voice, Video and Integrated Data
• AW: Admin Workstation
• AW: Administrative Weight
• AX.25

B

• B channel: Bearer channel
• B2B: Business to Business
• B2BUA: Back-to-Back User Agent
• B2C: Business to Consumer
• Back End
• Back Pressure
• Backbone
• Backchannel
• Signaling Backhauling
• Back-Haul
• Backoff
• Backplane
• Backward-learning
• Balanced Hybrid
• Balun: balanced-unbalanced
• Bandwidth
• Bandwidth Allocation
• Bandwidth Reservation
• Banyan VINES
• BARRNet: Bay Area Regional Research Network
• Baseband
• Baseline Report
• BASH: Bourne-Again SHell
• Bastion Host
• Baud
• BBN Planet
• BBN Report 1822
• BBN: Bolt, Beranek, and Newman
• BBS: Bulletin Board System
• Bc: Committed Burst
• B-Channel bundling
• BCP: Best Current Practices
• BCU: Balanced Configuration Unit
• Be: Excess Burst
• Beacon
• Bearer Channel
• BECN: Backward Explicit Congestion Notification
• Bellman-Ford Routing Algorithm
• BER: Basic Encoding Rules
• BER: Bit Error Rate
• Berkeley Sockets
• BERT: Bit Error Rate Tester
• Best-effort Delivery
• BIA: Burned-in MAC Address
• BICI: Broadband Inter-Carrier Interface
• BIGA: Bus Interface Gate Array
• Big-endian
• Binary
• BIND: Berkeley Internet Name Domain
• BinHex: Binary Hexadecimal
• BIP: Bit Interleaved Parity
• Bit
• Bit interval
• Bit Rate
• BITNET I
• BITNET II
• BITNET III
• BITNET: Because It's Time NETwork
• Bit-oriented Protocol
• BitTorrent
• Black Hole
• Block Multiplexer Channel
• Blocking State
• BLSR: Bidirectional Line Switch Ring
• BNI: Broadband Network Interface
• BNM: Broadband Network Module
• BNN: Boundary Network Node
• BONDING: Bandwidth ON Demand Interoperability Group
• Boolean
• Boolean Algebra
• Boolean AND
• Boolean logic
• Boolean OR
• Boolean value
• Boot Helper
• Border Gateway
• Border Node
• Bottleneck
• BPDU: Bridge Protocol Data Unit
• BPI: Baseline Privacy Interface
• BPS: Bits Per Second
• BRA: Basic Rate Access
• BRF: Bridge Relay Function
• BRHR: Basic Research and Human Resources
• BRI: Basic Rate Interface
• Bridge Forwarding
• Bridge Group
• Bridge ID
• Bridge MIB
• Bridge Number
• Bridge Static Filtering
• Bridging
• Broadband
• Broadband Medic
• Broadband Network
• Broadband Router
• Broadcast
• Broadcast Address
• Broadcast Domain
• Broadcast Search
• Broadcast Storm
• Broadcast Subnet
• Brouter
• Browser
• BSD: Berkeley Standard Distribution
• BSTUN: Block Serial Tunnel
• BT: Burst Tolerance
• BTA: Basic Trading Area
• BTU: British Thermal Units
• Burned-in Address
• Burst
• Burst transmission
• Burstable Billing
• Bursty Traffic
• Bus and Tag Channel
• Bus Contention
• Bus Network
• Bus Topology
• BVI: Bridge Group Virtual Interface
• BX.25: Bellcore X.25
• Bypass Mode
• Bypass Relay
• Byte
• Byte Multiplexer Channel
• Byte Reversal
• Byte-oriented Protocol

C

• Cable
• Cable Range
• Cable Router
• CAC: Connection Admission Control
• Caching
• CFI: Caligare Flow Inspector
• Call
• Call Admission Precedence
• Call Agent
• Call Leg
• Call Setup Time
• Campus Area Network
• CAP: Competitive Access Provider
• CAR: Committed Access Rate
• CAR: Cisco Access Registrar
• CARNet: Croatian Academic and Research Network
• Carnivore
• Catenet
• CATV: Cable Television
• Cause Codes
• CBDS: Connectionless Broadband Data Service
• CBR: Constant BCBBS: Computerized Bulletin Board Systemit Rate
• CBWFQ: Class-based Weighted Fair Queueing
• CCDA: Cisco Certified Design Associate
• CCDP: Cisco Certified Design Professional
• CCIE: Cisco Certified Internetwork Engineer
• CCIP: Cisco Certified Internetwork Professional
• CCITT: Consultative Committee for International Telegraph and Telephone
• CCNA: Cisco Certified Network Associates
• CCNP: Cisco Certified Network Professional
• CCR: Commitment, concurrency, and recovery
• CCSP: Cisco Certified Security Professional
• CCSRC: Cisco Subscriber Registration Center
• CCVP: Cisco Certified Voice Professional
• CD: Carrier Detect
• CDDI: Copper Distributed Data Interface
• CDF: Channel Definition Format
• CDF: Cutoff Decrease Factor
• CDR: Call Detail Record
• CDV: Cell Delay Variation
• CDVT: Cell Delay Variation Tolerance
• CE router: Customer Edge router
• Cell
• Cell Block
• Cell Payload Scrambling
• Cell Relay
• CELP: Code excited linear prediction compression
• CEN: European Committee for Standardization
• CENELEC: Comite Europeen de Normalisation Electrotechnique
• CER: Cell Error Ratio
• CERFnet: California Education and Research Federation Network
• CERN: European Laboratory for Particle Physics
• CES: Circuit Emulation Service
• CGI: Common Gateway Interface
• Chaining
• Channel Bonding
• Channel-Attached
• Channelized
• Channelized E1
• Channelized T1
• Chargen: Character Generation
• Chat Script
• Cheapernet
• Checksum
• Chernobyl Packet
• Child Peer Group
• Choke Packet
• Christmas Tree Packet
• Churn
• CIA: Classical IP over ATM
• CICNet
• CICS: Customer Information Control System
• CID: Craft Interface Device
• CID: Channel ID
• CIDR: Classless Inter-Domain Routing
• CIP: Channel Interface Processor
• CIR: Committed Information Rate
• Circuit
• Circuit Group
• Circuit Steering
• Circuit-level Inverse Multiplexing
• Cisco IOS
• CNR: Cisco Network Registrar
• Cisco ONP: Cisco Optical Network Planner
• CiscoWorks
• CW2000: CiscoWorks 2000
• Cybercafe
• Cisco WRM: Cisco Wavelength Router Manager
• Cisco WW TAC: Cisco's World-Wide Technical Assistance Center
• CiscoView
• CIX: Commercial Internet Exchange
• Clara Network
• Classful Routing
• Classful Routing Protocol
• Classless Routing Protocol
• Clear Channel
• ClearCase
• ClearDDTS
• ClearQuest
• CLEI: Common Language Equipment Identifier
• CLI: Command-line Interface
• CLI: Command Language Interpreter
• Client/Server Computing
• Client-server model
• CLNS: Connectionless Network Service
• CLP: Cell Loss Priority
• CLR: Cell Loss Ratio
• CLS: Cisco Link Services
• CLSI: Cisco Link Services Interface
• Cluster
• Cluster Controller
• CMI: Coded Mark Inversion
• CMS: Call Management System
• CMS: Configuration Management System
• CMT: Connection ManagemenT
• CMTS: Cable Modem Termination System
• CO FRAD: Central office frame relay access device
• COCF: Connection-Oriented Convergence Function
• Co-SysOp
• Codec: Coder-decoder
• Codec: Compression/Decompression
• Coding
• Collapsed Backbone
• Collision
• Collision Avoidance
• Collision Detection
• Collision Domain
• Colocation
• Common Carrier
• Communication Controller
• Communication Server
• Communications Line
• Community String
• Companding
• Composite Clock
• Composite Timing
• Compound Option
• Compression
• Computer Cluster
• CONF: Configuration Failure
• Configuration Direct VCC
• Configuration Management
• Configuration register
• Configuration Tool
• Congestion
• Congestion Avoidance
• Congestion Collapse
• Connectionless
• Connectionless Mode Transmission
• Connectionless Protocol
• Connectionless Routing
• Connection-Oriented
• Connection-oriented mode transmission
• Connection-oriented Protocol
• CONS: Connection-oriented network service
• Console
• Constraint-based Routing
• Contention
• Context Aware Network
• Control Direct VCC
• Control Messages
• CAN: Controller Area Network
• Convergence
• Cookie
• Coral Content Distribution Network
• CORBA: Common Object Request Broker Architecture
• Core Gateway
• Core Router
• COS: Class of Service
• COS: Corporation for Open Systems
• CoS Management
• COSINE: Cooperation for Open Systems Interconnection Networking in Europe
• Cost value
• Continuity Test
• Count To Infinity
• CP: Control Point
• CPCS: Common Part Convergence Sublayer
• CPE: Customer Premises Equipment
• CPI-C: Common Programming Interface for Communications
• CPNIE: Called party number information element
• CPNIE: Calling Party Number Information Element
• CPS: Cells Per Second
• CPSIE: Called Party Subaddress Information Element
• CQ: Custom Queuing
• Crankback
• CRC: Cyclic Redundancy Check
• CREN: Corporation for Research and Educational Networking
• CRF: Concentrator Relay Function
• CRF: Cell Relay Function
• CRF: Connection Related Function
• CRL: Certificate Revocation List
• CRM: Cell Rate Margin
• Cross Talk
• CRP: Customer Routing Point
• CRS: Cell Relay Service
• CRV: Call Reference Value
• CS: Convergence Sublayer
• CSA: Canadian Standards Association
• CS-ACELP: Conjugate Structure Algebraic Code Excited Linear Prediction
• CSD Box: Control Signal Distribution Box
• CSI: Called Subscriber Identification
• CSNET: Computer Science Network
• CSNP: Complete Sequence Number PDU
• CSO: Composite Second Order Beat
• CTB: Composite Triple Beat
• CTD: Cell Transfer Delay
• CTI: Computer Telephony Integration
• CTS: Clear To Send
• CTS: Common Transport Semantic
• CUDI: Coorporación Universitaria para el Desarrollo de Internet
• Cut-Through
• Cut-through Packet Switching
• Cut-through Switch
• CV: Coding Violation
• Cyberspace

D

• DAC: Discretionary Access Control
• DAC: Dual-attached Concentrator
• DACS: Digital access and Cross-Connect System
• DARPA: Defense Advanced Research Projects Agency
• DAS: Dual Attachment Station
• DAS: Dynamically Assigned Socket
• Data Direct VCC
• Data Encapsulation
• Data Flow
• Data Flow Control Layer
• Data Link Control
• Data Link Layer
• Data packet
• Data Sink
• Data Stream
• Datacasting
• Datagram
• Datakit
• Data-link Control Layer
• Datex
• DAVIC: Digital Audiovisual Council
• DB Connector: Database Bus connector
• DB: Decibels
• DBA: Dynamic Bandwidth Allocation
• dBm: Decibels per milliwatt
• dBmV
• dBW
• DCA: Defense Communications Agency
• DCC: Data Communications Channel
• DCC: Data Country Code
• DCE: Data Communications Equipment
• DCE: Distributed Computing Environment
• DCF: Dispersion Compensating Fiber
• DCN: Data Communications Network
• DCOM: Distributed Component Object Model
• DCS: Digital Crossconnect System
• DCT: Discrete Cosine Transform
• DDIC: DVB/DAVIC Interoperability Consortium
• DDM: Distributed Data Management
• DDN: Defense Data Network
• DDNS: Dynamic DNS
• DDR: Dial-on-demand Routing
• De jure standard
• DE: Discard Eligible
• De-activation
• Deadlock
• DECnet
• DECnet Plus
• DECnet Routing
• Dedicated LAN
• Dedicated Line
• Default Gateway
• Default Route
• Defense Message System
• Deflection routing
• Delay
• DELNI: Digital Ethernet Local Network Interconnect
• Demand Priority
• Demarc: Demarcation point
• Demodulation
• Demodulator
• Demux: Demultiplexer
• DEN: Directory Enabled Networking
• Dense Mode Multicast
• Deny
• Deprovisioning
• DER: Distinguished Encoding Rules
• Designated Bridge
• Designated Port
• Designated Router
• Destination Address
• Destination Node
• Destination User
• Deterministic Load Distribution
• DFN: Deutsches ForschungsNetz e.V.
• DIA: Document Interchange Architecture
• Diag100
• Dial Backup
• Dial Peer
• Dial-up Line
• DID/DNIS: Direct Inward Dialing/Dialed Number Identification Service
• DID: Direct-inward-dial
• Differential Encoding
• Differential Manchester Encoding
• Differentiated Service
• DIN Connector: Deutsche Industrie Norm connector
• DIN: Deutsche Industrie Norm
• Directed Broadcast Address
• Directed Search
• Directed Tree
• Directory Services
• DISA: Defense Information Systems Agency
• Discovery Mode
• Disengage Request
• DISN: Defense Information System Network
• Distance Vector
• Distance Vector Routing Algorithm
• Distortion Delay
• Distributed Computing Environment
• Distributed Director
• Distributed Processing
• Distributed Switching
• DIT: Directory Information Tree
• DIX: DEC, Intel, and Xerox
• DLCI: Data-link Connection Identifier
• DLL: Delay Locked Loop
• DLSw+: Data-link Switching Plus
• DLU: Dependent LU
• DLUR Node
• DLUR: Dependent LU Requester
• DLUS Node
• DLUS: Dependent LU Server
• DMA: Direct Memory Access
• DMAC: Destination MAC
• DMP: Data Movement Processor
• DMTF: Distributed Management Task Force
• DN: Dialed Number
• DN: Distinguished Name
• DNA: Digital Network Architecture
• DNA: DoNotAge
• DNIC: Data Network Identification Code
• DNIS: Dialed Number Identification Service
• DNS zone: Domain Name Server zone
• DNSIX: DOD Network Security for Information Exchange
• DOCSIS CM: DOCSIS Cable Modem
• DOCSIS CMTS: DOCSIS cable modem termination system
• DOCSIS Configuration File
• DoD: Department Of Defense
• Domain
• Domain Name
• Dongle
• Dot Address
• Dot-decimal Notation
• Dotted Decimal Notation
• Download
• Downstream
• DPM: Defect Per Million
• DPMO: Defects per million opportunites
• DRDA: Distributed Relational Database Architecture
• Drop
• Drop Cable
• Drop-and-Insert
• DSA: Directory System Agent
• DSAP: Destination Service Access Point
• DSCP: Differentiated services code point
• DSF: Dispersion-shifted fiber
• DSLAM: Digital Subscriber Line Access Multiplexer
• DSn: Delivery Status notification
• DSP: Domain Specific Part
• DSPU concentration
• DSPU: Downstream Physical Unit
• DSR: Data Set Ready
• DSRFLOW
• DSU: Data Service Unit
• DSX-1
• DTE: Data Terminal Equipment
• DTL: Designated Transit List
• DTMF relay: Dual-tone Multifrequency Relay
• DTMF: Dual Tone Multifrequency
• DTR: Data Terminal Ready
• DUA: Directory User Agent
• Dual Counter-rotating Rings
• Dual Homing
• Dual Stack
• DUAL: Diffusing Update Algorithm
• Dual-homed Station
• Dumb network
• DVB: Digital Video Broadcasting
• DVB-C
• DVB-S
• DVB-S2
• DVB-H
• DVB-T
• DVVI: Data, Voice, Video Integration
• DWDM: Dense Wavelength Division Multiplexing
• DXI: Data Exchange Interface
• Dynami Routing
• Dynamic Adaptive Routing
• Dynamic Address Resolution
• Dynamic Buffer Management
• Dynamic Ports
• Dynamic Routing
• Dynamic Routing Protocol
• Dynamic Switched Call

E

• E164 NUmber Mapping
• E2A
• EA: Extended Address
• Early Token Release
• EARN: European Academic Research Network
• EAS: Expert Agent Selection
• EBCDIC: Extended Binary Coded Decimal Interchange Code
• EBN: Extended Border Node
• EBONE: European Backbone
• EBU: European Broadcasting Union
• ECC: Error-Correcting Code
• Echo
• Echo Cancellation
• Echo Test
• Echoplex
• ECM disable
• ECM: Error Correction Mode
• ECMA: European Computer Manufacturers Association
• Econet: Economy Network
• EDC: Error-Detecting Code
• EDFA: Erbium-doped Fiber Amplifier
• Edge Device
• Edge LSR
• EDI: Electronic Data Interchange
• EDIFACT: Electronic Data Interchange for Administration, Commerce, and Transport
• eDonkey Network
• EDUCAUSE
• EENet: Estonian Educational and Research Network
• EFCI: Explicit Forward Congestion Indication
• EFF: Electronic Frontier Foundation
• Effective Data Transfer Rate
• EFM: Ethernet in the First Mile
• Egress
• EHSA: Enhanced High System Availability
• EIA/TIA-232
• EIA/TIA-449
• EIA/TIA-586
• EIA: Electronic Industries Alliance
• EIA-422
• EIA-485
• EIA-530
• EIP: Ethernet Interface Processor
• EIRP: Effective Isotropic Radiated Power
• EISA: Extended Industry-Standard Architecture
• E-ISUP: Extended-ISUP
• ELAN: Emulated LAN
• Electromagnetic Spectrum
• EMA: Enterprise Management Architecture
• E-mail: Electronic mail
• EMI: Electromagnetic Interference
• EMIF: ESCON Multiple Image Facility
• EMP: Electromagnetic Pulse
• EMS: Element Management System
• EMTOX: Exchange of Mixed Traffic over X.25
• Emulation
• Emulation Mode
• Emultiplexing
• EN: End Node
• Encapsulating or Encapsulation
• Encapsulating
• Encapsulation
• Encapsulation Bridging
• Encoder
• Encoding
• End Point or Endpoint
• End-to-end Principle
• Enterprise Network
• Enterprise Project Management
• Entity
• Entity Identifier
• Entity Name
• Entity Type
• ENUM: E164 NUmber Mapping
• EOM: End Of Message
• EoS: Ethernet over SONET/SDH
• EOT: End of Transmission
• EPD: Early Packet Discard
• ER: Explicit Rate
• Error Control
• ES: End System
• ES: Errored Second
• ESCON Channel
• ESCON: Enterprise System Connection
• ESD: Electrostatic Discharge
• ESI: End System Identifier
• Esnet: Energy Sciences Network
• ETH Unit: Ethernet Unit
• EtherChannel
• Ethereal
• Ethernet
• Ethernet hub
• Ethernet Meltdown
• Ethernet VPN
• EtherType
• ETSI: European Telecommunications Standards Institute
• EUnet: European Internet
• E-Work
• EWOS: European Workshop for Open Systems
• Excess Rate
• EXeem
• EXeem Lite
• Expansion Card
• Expedited Delivery
• Explicit Path
• Explicit Route
• Explorer Frame
• Explorer Packet
• Extended Label ATM Interface
• Exterior Router
• External ATM Interface
• Extranet

F

• Failure Domain
• Fallback
• Fan-in unit
• Fan-out Unit
• Fantail
• FAQ: Frequently Asked Questions
• FARNET: Federation of American Research NETworks
• Fast Ethernet
• Fast Link Pulse
• Fast Packet
• Fast Packet Switching
• Fast switching
• FastTrack
• Fat Pipe
• Fault Management
• FCAPS: Faults, Configuration, Accounting, Performance, Security
• FCC: Federal Communications Commission
• FCFS: First come first served
• FCS: Frame Check Sequence
• FCS: Frame Check Sequence
• FDDITalk
• Fdgw
• FDM: Frequency-division Multiplexing
• Feature Boards
• FEC: Forward Error Correction
• FEC: Forwarding Equivalence Class
• FECN: Forward Explicit Congestion Notification
• FEIP: Fast Ethernet Interface Processor
• FEP: Front-end Processor
• FFDT: FDDI Full Duplex Technology
• Fiber Optics
• Fiber Plant
• Fiber-optic Cable
• Fibre Channel
• FICON: Fiber Connectivity
• FID0: Format Indicator 0
• FID1: Format Indicator 1
• FID2: Format Indicator 2
• FID3: Format Indicator 3
• FID4: Format Indicator 4
• FidoNet
• Field Replaceable Unit
• FIFO Queueing
• FIFO: First-in, first-out
• File sharing
• File Transfer
• Filter
• Filtering Router
• FireFox
• FireWire
• Firmware
• FISU: Fill-In Signal Unit
• FIX: Federal Internet Exchange
• Flapping
• Flash Update
• Flat Addressing
• F-link: Fully associated link
• Flooding
• Flow
• Flow Control
• Flowspec
• FLT: Full Line Terminal
• FNC: Federal Networking Council
• FOIRL: Fiber-optic Interrepeater Link
• Footprint
• Ford-Fulkerson Algorithm
• Forward Channel
• Forward Delay Interval
• Forward Delay Timer
• Forward Lookup
• Forward or forwarding
• Forwarding State
• FOTS: Fiber Optics Transmission Systems
• Fourier Transform
• FQDN: Fully Qualified Domain Name
• FRAD: Frame Relay Access Device
• Fragment
• Fragment Offset
• Fragmentation
• Fragment-free Switching
• Frame
• Frame Forwarding
• Frame Relay Bridging
• Framing
• Freenet
• FREESCO: FREE ciSCO
• Free-trade Zone
• FRF.11
• FRF.12 Implementation Agreement
• FRF.8
• FRF: Frame Relay Forum
• FRF11-trunk
• Friend-to-friend (F2F)
• Front End
• FRTS: Frame Relay Traffic Shaping
• FTTH: Fiber-To-The-Home
• FTTP: Fiber-To-The-Premises
• Full Duplex
• Full Mesh
• Full-Duplex Operation
• Fully-Qualified Domain Name
• Function Group
• FUNET: Finnish University Network
• Fuzzball Router
• FXS: Foreign Exchange Station

G

• Galactic Network
• Gatekeeper
• Gateway
• Gateway Host
• Gateway NCP
• Gateway Redundancy
• Gateway Supported Prefixes
• Gb: Gigabit
• GB: Gigabyte
• GBIC: Gigabit Interface Converter
• Gbps: Gigabits Per Second
• GBps: Gigabytes Per Second
• GCAC: Generic Connection Admission Control
• GCF: Gatekeeper ConFirmation
• GCRA: Generic Cell Rate Algorithm
• GDMO: Guidelines for Definitions of Managed Options
• GEANT
• GEANT2
• Gethostbyaddr
• Gethostbyname
• GFC: Generic Flow Control
• GG45
• Gigabit Ethernet
• Gigapackets
• GIX: Global Internet eXchange
• Gleaning
• GLORIAD: Global Ring Network for Advanced Application Development
• GMCU: Group Matrix Card Unit
• GNN: Global Network Navigator
• GNS: Get Nearest Server
• GNU Zebra
• GNUnet
• Gnutella
• Godzillagram
• Go-Back-N ARQ
• Goodput
• GOSIP: Government OSI Profile
• Gotnap
• Grid Network
• GRJ: Gatekeeper ReJection
• GRNET: Greek Research and Technology Network
• Groove
• Group 3
• GRQ: Gatekeeper ReQuest

H

• Hairpin
• Half-Duplex
• Half-Duplex Operation
• Handshake or Handshaking
• Handshake
• Handshaking
• Headend
• Header
• HEAnet: Ireland's National Education & Research Network
• HEC: Header Error Control
• Hello
• Hello Message
• Hello Packet
• Hello Timer
• Helper address
• HEPnet
• Heterogeneous Network
• Heuristic Routing
• HFC: Hybrid Fiber Coax
• Hierarchical Addressing
• Hierarchical Routing
• HIL Bus: Human Interface Loop Bus
• HIP: HSSI Interface Processor
• HIPPI: HIgh Performance Parallel Interface
• HLA: High Level Architecture
• HLD: High-level Designator
• HLP: Higher Layer Protocol
• Holddown
• Holddown period
• Home Gateway
• Homologation
• Hoot and Holler
• Hop
• Hop Count
• Hop Off
• Host
• Host address
• Host File
• Host Name
• Host Node
• Host Number
• Hot Standby
• Hot Swapping
• Hot-potato routing
• HPCC: High Performance Computing and Communications
• HPCS: High-Performance Computing Systems
• HPPI: High Performance Parallel Interface
• HPR: High Performance Routing
• HSCI: High-Speed Communications Interface
• HSSI: High-Speed Serial Interface
• HT: HyperTransport
• Hub
• Hub MIB
• Hybrid network
• Hyperlink
• Hypertext

I

• I/O: Input/Output
• I2P: Invisible Internet Project
• IAB: Internet Architecture Board
• IAHC: Internet International Ad Hoc Committee
• IANA: Internet Assigned Number Authority
• IBC: In-band Control
• IBM Director
• IBTA: InfiniBand Trade Association
• ICANN: Internet Corporation for Assigned Names and Numbers
• ICD: International Code Designator
• ICP Cell: IMA control protocol cell
• ICPIF: Calculated Planning Impairment Factor loss/delay busyout threshold
• ICR: Initial Cell Rate
• ICS: Internet Connection Sharing
• I-D: Internet-Draft
• IDB: Interface Description Block
• IDI: Initial Domain Identifier
• IDN: International Data Number
• IDP: Initial Domain Part
• IE: Internet Explorer
• IEC 62365
• IEC: International Electrotechnical Commission
• IEEE 1284
• IEEE 488
• IEEE: Institute of Electrical and Electronics Engineers
• IEPG: Internet Engineering Planning Group
• IESG: Internet Engineering Steering Group
• IETF: Internet Engineering Task Force
• IFIP: International Federation for Information Processing
• IF-MIB: Interfaces Group MIB
• I-frame: Information frame
• IFRAME: Inline frames
• IIH: IS-IS Hello
• IINREN: Interagency Interim National Research and Education Network
• IIS: Internet Information Services
• IITA: Information Infrastructure Technology and Applications
• ILMI: Interim Local Management Interface
• IMA Group
• IMHO: In My Humble Opinion
• Immediate Start
• IMP: Interface Message Processor
• In-Rate Cell
• INA: Information Networking Architecture
• INA: Interactive Network Adapter
• INASoft
• INB: Install Busy
• Inband Signalling
• INE: Intelligent Network Element
• Inetd: Internet Daemon
• InfiniBand
• Information Element
• Infranet Initiative
• Ingress Noise
• INOC: Internet Network Operations Center
• Insured Burst
• Insured Rate
• Insured Traffic
• INTAP: Interoperability Technology Association for Information Processing
• Integrated Services Internet
• Intelligent network
• Interarea Routing
• Interior router
• International Standards Organization
• Internet
• Internet Backbone
• Internet Café
• Internet Oracle
• Internet Telephony
• Internet troll
• Internet2
• Internetwork
• Internetworking
• InterNIC: Internet Information Center
• Interop
• Interoperability
• Intra-area Routing
• Intranet
• IntServ: Integrated Service
• IONL: Internal Organization of the Network Layer
• IOS: Internetwork Operating System
• IP address
• IP Datagram
• IP Explicit Path
• IP Multicast
• IP Multicast Heartbeat
• IP over ATM
• IP Precedence
• IP Router
• IP Subnetting
• IP Switch
• IP Telephony
• IP Traceback
• IPAM: IP Address Management
• IPC: Interprocess communications
• IPCheck
• IPng: IP Next Generation
• IPTV: Internet Protocol Television
• IR: Intermediate Reach
• IR: Internet Registry
• IRB: Integrated Routing and Bridging
• IRN: Intermediate Routing Node
• IRR: Information request
• IRSG: Internet Research Steering Group
• IRTF: Internet Research Task Force
• IS: Intermediate System
• ISA: Industry-Standard Architecture
• Isarithmic Flow Control
• ISDN BRI
• ISDN D-channel Signalling
• ISO 3309
• ISO 9000
• ISO Protocols
• ISO: International Organization for Standardization
• ISOC: Internet Society
• ISODE: ISO Development Environment
• ISP: Internet Service Provider
• ISR: Intermediate Session Routing
• ISSI: Inter-Switching System Interface
• ITCM: Integrated Telephony Cable Modem
• Itnet: Institute of Technology Network
• ITT: Ideal Transmission Time
• ITU: International Telecommunication Union
• ITU-T: International Telecommunication Union Telecommunication Standardization Sector
• IXP: Internet Exchange Point

J

• Jabber Lock-Up
• Jacobson's algorithm
• JANET: Joint Academic NETwork
• JIDM: Joint Inter-Domain Management
• Jitter
• Jitter buffer
• JTAPI: Java Telephony Application Programming Interface
• Jumper
• Junction
• JUNET: Japan UNIX Network
• JvNCnet: John von Neumann Computer Network
• JXTA: Juxtapose

K

• KA9Q
• Kad Network
• Kademlia
• Karn's Algorithm
• Kazaa Lite K++
• Kazaa Lite Resurrection
• Kazaa Lite Revolution
• Kazaa or Kazzaa
• Kb: Kilobit
• KB: Kilobyte
• Kbps: Kilobits Per Second
• KBps: Kilobytes Per Second
• Keepalive Interval
• Keepalive Message
• K-Lite: Kazaa Lite
• KVA: Kilovolt-ampere

L

• L2TP Session
• L2TP Tunnel
• LAA: Locally Administered Address
• Label Imposition
• Label Swapping
• Label Switch
• LAC: L2TP Access Concentrator
• laddr: Local address
• Lag
• LAN Manager
• LAN Server
• LAN Switch
• LAN: Local Area Network
• LANE: LAN Emulation
• LAT: Local Address Table
• Late Collision
• Latency
• Layer
• Layer 4 router
• LBR: Label Bit Rate
• LC-ATM Interface
• LCC: Line Card Control
• LCF: Location Confirm Message
• LCI: Logical Channel Identifier
• LCN: Logical Channel Number
• Leaf Internetwork
• Leaky Bucket
• Learning Bridge
• Leased Line
• LEC: LAN Emulation Client
• LECS: LAN Emulation Configuration Server
• LEN Node: Low-entry Networking Node
• Leonard Kleinrock
• LES: LAN Emulation Server
• Level 1 Router
• Level 2 Router
• LFIB: Label Forwarding Information Base
• LFSR: Linear Feedback Shift Register
• LGN: Logical Group Node
• Limited Resource Link
• Line Code Type
• Line Conditioning
• Line Driver
• Line of Sight
• Link
• Link Aggregation
• Link State Routing Algorithm
• LIS: Logical IP Subnet
• Listserv
• LITNET: Academic and Research Network in Lithuania
• Little-endian
• LMI: Local Management Interface
• LMT: Last mile technology
• LMU: LAN Manager for UNIX
• LNM: LAN Network Manager
• LNNI: LAN Emulation Network-to-Network Interface
• LNS: L2TP Network Server
• Load Balancing
• Local Acknowledgment
• Local adjacency
• Local Bridge
• Local Explorer Packet
• Local Traffic Filtering
• LOCD: Loss of Cell Delineation
• LOF: Loss of Frame
• Logical Channel
• Longest Prefix Match
• Look-Aside Interface
• Loop
• Loopback
• Loopback Address
• Loopback interface
• Loopback Packet
• Loopback Test
• LOP: Loss of Pointer
• LOS: Line of Sight
• LOS: Loss of Signal
• Lossy
• Low speed link
• LPD: Line Printer Daemon
• LR: Long Reach
• LRE: Long Reach Ethernet
• LRJ: Location ReJect Message
• LRQ: Location ReQuest
• LSA: Link-State Advertisement
• LSAP: Link Service Access Point
• LSB: Least Significant Bit
• LSC: Label Switch Controller
• LSC: Link State Control
• LSP tunnel: Label switched path tunnel
• LSP: Label Switched Path
• LSR: Label Switch Router
• LSRR: Loose Source and Record Route
• LSSU: Link Status Signal Unit
• LTE: Line-terminating Equipment
• LUNI: LAN Emulation User-to-Network Interface
• LUSerNet
• LVC: Label switched controlled virtual circuit

M

• MAC address
• MAC address learning
• MAC Layer
• MAC: Media Access Control
• MADI: Multi-channel Audio Digital Interface
• MAE: Metropolitan Access Exchange
• Mail Bridge
• Mail Exploder
• Mail Gateway
• MAN: Metropolitan-area Network
• Managed FRAD
• Managed Object
• Manchester Encoding
• Martian Packet
• Martian: Packets from Mars
• Master Control Port
• MATV: Master Antenna TV
• MAU: Medium Attachment Unit
• MaxAge Timer
• Maximum Burst
• Maximum Rate
• Mb: Megabit
• MB: Megabyte
• MBBS
• MBONE: Multicast Backbone
• Mbps: Megabits Per Second
• MBps: Megabytes Per Second
• MBS: Maximum Burst Size
• MCA: Micro Channel Architecture
• MCDV: Maximum Cell Delay Variation
• MCLR: Maximum Cell Loss Ratio
• MCNS: Multimedia Cable Network System Partners Ltd
• MCR: Minimum Cell Rate
• MCTD: Maximum Cell Transfer Delay
• MD: Mediation Device
• MDI Uplink
• MDI: Medium-dependant Interface
• MDIX: Medium Dependent Interface Crossover
• MDN: Message Disposition Notification
• Media
• Media Rate
• Media Stream
• Mesh
• Mesh Networking
• Message
• Message Switching
• Message Unit
• Meta tags
• Metasignaling
• Metric
• MFA Forum
• MGC Switchover
• MGC: Media Gateway Controller
• MGW: Media Gateway
• MHP: Multimedia Home Platform
• MHS: Message Handling System
• MIB: Management Information Base
• MIC: Media Interface Connector
• Microcode
• Microfilter
• Microsegmentation
• MID: Message Identifier
• Mid-level Network
• Midsplit
• Migration data host
• MII: Medium Independent Interface
• MILNET: Military Network
• Mirror Site
• Mirroring
• Mips: Millions of instructions per second
• Mixing Segment
• MLS: Multilayer Switch
• MMF: Multimode Fiber (MM Fiber)
• MML: Man-Machine Language
• MMoIP: Multi-Media over IP
• MMP: Multichassis Multilink PPP
• Mnet
• Modem Eliminator
• Modem server
• Mosaic
• Mozilla Firefox
• MQI: Message Queuing Interface
• MRM: Multicast Routing Monitor
• MRP: Multiservice Route Processor
• MRTG: Multi Router Traffic Grapher
• MSAU: Multistation Access Unit (or MAU)
• MSB: Most Significant Bit
• MSLT Adjustment: Minimum Scan Line Time Adjustment
• MSLT: Minimum Scan Line Time
• MSN SysOp
• MSO: Multiple Service Operator
• MSS: Maximum Segment Size
• MTA: Message Transfer Agent
• MTBF: Mean Time Between Failure
• MTTR: MeanTime to Repair
• MTU: Maximum Transmission Unit
• MUD: Multi-user Dungeon
• Multiaccess Network
• Multicast
• Multicast Address
• Multicast Forward VCC
• Multicast Group
• Multicast Router
• Multicast Send VCC
• Multicast Server
• Multidrop Line
• Multi-Homed
• Multihomed Host
• Multihoming
• Multi-instance Option
• Multi-Layer Switching
• Multiple Domain Network
• Multiplexer
• Multiplexing
• Multipoint
• Multipoint Control Unit
• Multipoint-Unicast
• Multiport Repeater
• MultiRate
• MultiService Switch
• Multi-Unicast
• Multivendor Network
• Multizone network
• MUX: Multiplexer
• MX Record: Mail exchange record

N

• NACK: Not Acknowledge
• NACS: NetWare Asynchronous Communication Services
• NADF: North American Directory Forum
• NADN: Nearest Active Downstream Neighbor
• Nagle algorithm
• NAK: Negative Acknowledgment
• Name Caching
• Name Resolution
• Name Server
• Namespace
• Naming Scheme
• NANOG: North American Network Operator's Group
• NAP: Network Access Point
• Napster
• NAPT: Network Address Port Translation
• Narrowcast
• NAS: Network Attached Storage
• NASI: NetWare Access Server Interface
• NASI: NetWare Asynchronous Support Interface
• NAT: Network Address Translation
• National LambdaRail
• NAU: Network Addressable Unit
• NAUN: Nearest Active Upstream Neighbor
• NBDDS: NetBIOS Datagram distribution service
• NBNS: NetBIOS Name Service
• NBS: National Bureau of Standards
• NBSS: NetBIOS Session Service
• NCIA: Native Client Interface Architecture
• NCP: Network Control Point
• NCP: Network Control Program
• NCSA: National Center for Supercomputing Applications
• NDIS: Network Driver Interface Specification
• NE: Network Element
• Neighborhood
• Neighboring Routers
• NET: Network Entity Title
• Netburp
• Netflow
• Netiquette
• Netmask
• Netsplit
• Netsukuku
• NetView
• Network Access Server
• Network Adapter
• Network Address
• Network Administrator
• Network Analyzer
• Network Architecture
• Network Bottleneck
• Network Byte Order
• Network Coding
• Network Complexity
• Network Compliance
• Network Computing
• Network Computing System
• Network Control Program
• Network Diagnose
• Network Diagram
• Network Driver Interface Specification (NDIS) interface library
• Network Gateway
• Network Health
• Network Interface
• Network Layer
• Network logon 
• Network Management
• Network Map
• Network Mapping
• Network mapper 
• Network monitor 
• Network monitoring
• Network Number
• Network of Workstations
• Network Operator
• Network Perimeter
• Network Port
• Network Redirector
• Network Routing Method
• Network Security
• Network Switch
• Network Tap
• Network Topology
• Neural Network
• NFAS: Non-Facility Associated Signaling
• NGN: Next Generation Networking
• NHS: Next Hop Server
• NIC: Network Interface Card
• NIPRNET: Non-secure Internet Protocol Router Network
• NIS: Network Information System
• N-ISDN: Narrowband ISDN
• NIST: National Institute of Standards and Technology
• NLBS: Network Load Balancing Services
• NLESO: Network-level Extended Security Option
• NLM: NetWare Loadable Module
• NLRI: Network Layer Reachability Information
• NMS: Network Management System
• NMVT: Network Management Vector Transport
• NN: Network Node
• NNI: Network-to-Network Interface
• NNM: Network Node Manager
• NNS: Network Node Server
• NOC: Network Operations Center
• Node
• Nodezilla
• Nonce
• Nonextended Network
• Non-repudiation Service
• Nonseed Router
• Non-stub Area
• NORDUnet
• Northwest Net
• NOS: Network Operating System
• Notification Code
• NR: Network Registrar
• NREN: National Research and Education Network
• NRM: Normal Response Mode
• NRM: Number of RM Cells
• NRZ: Nonreturn to Zero
• NRZI: Nonreturn to Zero Inverted
• NSA: Non-service-affecting
• NSAP: Network Service Access Point
• NSAPI: Network Service Access Point Identifier
• NSF: National Science Foundation
• NSFNET: National Science Foundation Network
• NTFS: New Technology File System
• NTIA: National Telecommunications and Information Administration
• NT-1: Network Termination 1
• NTRI: NCP/Token Ring Interconnection
• NTSC: National Television Systems Committee
• Null Modem
• NVE: Network-visible Entity
• NYSERNet
• NZ-DSF: Non zero-Dispersion-Shifted Fiber

O

• OADM: Optical add Drop Multiplexer
• OAM Cell
• OARnet: Ohio Academic Resources Network
• OBC: Out-of-band Control
• Object Instance
• OC: Optical Carrier
• OCLC: Online Computer Library Catalog
• Octet
• ODA: Open Document Architecture
• ODBC: Open DataBase Connectivity
• ODI: Open Data-Link Interface
• OFA: Optical Fiber Amplifier
• OID: Object Identifier
• OIM: OSI Internet Management
• OIR: Online Insertion and Removal
• OMG: Object Management Group
• ONC NFS
• ONC: Open Network Computing
• Ones Density
• Onion Routing
• OOTB: Out-of-the-box
• Open Circuit
• Open Mail Relay
• Open Proxy
• OpenAcs: Open Architecture
• OpenFT
• OpenView
• OpenWrt
• OPS/INE: Operations Provisioning System/lntelligent Network Element
• OPT: Open Packet Telephony architecture
• OSF: Open Software Foundation
• OSI 7-Layer Reference Model
• OSI Network Address
• OSI Presentation Address
• OSI: Open System Interconnection
• OSINET
• OSS: Operations Support System
• OSSI: Operations Support System Interface
• OUI: Organizationally Unique Identifier
• Outframe
• Out-of-band Signaling
• Out-of-Rate Cell
• Overlap
• Overlay Multicast
• Overlay Network
• Overnet

P

• P/F: Poll/Final bit
• p2mp: Point-to-multipoint
• P2P: Peer-to-peer
• Packet
• Packet Analysis
• Packet Analyzer
• Packet driver
• Packet Pain
• Packet Sniffer
• Packet Switch
• Packet Switch Network
• Packet Switching
• Packet-level Inverse Multiplexing
• Packet-switching Node
• PAD: Packet Assembler/Disassembler
• PAM: Port to Application Mapping
• PAN: Personal Area Network
• Parallel Channel
• Parallel Transmission
• Parallelism
• PARC: Palo Alto Research Center
• Parent Peer Group
• Parity
• Parity Check
• Parking a Domain Name
• Partial Mesh
• Passive FTP
• PASV: Passive mode FTP
• Patch Cable
• Path Control Layer
• Path Control Network
• Path Name
• Path State Block
• Paul Baran
• Payload
• PBR: Policy-based Routing
• PC Card
• PCI: Protocol Control Information
• PC-Network
• PCR: Peak Cell Rate
• PCS: Personal Communications Service
• PDN: Public/private/packet Data Network
• PDU: Protocol Data Unit
• PE Router
• Peak Rate
• Peer Group
• PeerGuardian
• Peer-to-Peer Computing
• Performance Management
• Performance Monitoring
• Peripheral Node
• Permanent Virtual Circuit Interface Priority Queueing
• PGL: Peer Group Leader
• Phase Shift
• PHB: Per-Hop Behaviour
• PHP: Penultimate Hop Popping
• PHY: Physical Layer Device
• Physical Control Layer
• Physical Layer
• PHYSNET: Physics Network
• PIAFS: Personal Handyphone Internet Access Forum Standard
• Piggybacking
• Ping: Packet internet groper
• Ping-Ponging
• PLCP: Physical Layer Convergence Procedure
• PLU: Primary Logical Unit
• PMD: Physical Medium Dependent
• PMD: Polarization Mode Dispersion
• POD: Packet of Disconnect
• PoE: Power over Ethernet
• Point-to-Multipoint Connection
• Point-to-point Connection
• Poison Reverse
• POL-34
• Policy
• Policy Decision Point
• Policy Enforcement Point
• Policy Routing
• Policy Server
• Polling
• Port
• Port Address Translation
• Port Mirroring
• Port Number
• Port Triggering
• Portal
• POSI: Promoting Conference for OSI
• POTS Splitter
• Power-on Servicing
• PPS: Packet per second
• PQ/CBWFQ: Priority Queueing/Class-based Weighted Fair Queueing
• Preamble
• Precloning
• Presence technology
• Presentation Layer
• Presentation Services Layer
• PRI: Primary Rate Interface
• Primary Ring
• Primary Station
• Print Server
• Priority output queuing
• Priority Queue
• Private IP address
• Private Ports
• Privileged Process
• PRMD: Private Management Domain
• Process switching
• Promiscuous Mode
• Propagation Delay
• Proprietary
• Protected Checksum
• Protection Ring
• Protocol
• Protocol analysis
• Protocol Analyzer
• Protocol Converter
• Protocol decoder
• Protocol decoding
• Protocol Stack
• Protocol Suite
• Protocol Translator
• Protocol Type
• Provider Edge Router
• Provisioning
• Proxy ARP
• Proxy Explorer
• Proxy Mode
• Proxy polling
• Proxy Service
• PRTG: Paessler Router Traffic Grapher
• PSDN: Packet-switched Data Network
• Pseudowire
• PSS: Packet Switch Stream
• PTI: Payload Type Identifier
• PTSE: PNNI Topology State Element
• PTSP: PNNI Topology State Packet
• PU 2.1: Physical Unit type 2.1
• PU 2: Physical Unit 2
• PU 4 : Physical Unit 4
• PU 5: Physical Unit 5
• PU: Physical Unit
• PVC: Permanent Virtual Circuit
• PVP Tunneling: Permanent Virtual Path Tunneling
• PVP: Permanent Virtual Path
• PVST: Per-VLAN Spanning Tree
• PVST+ : Per-VLAN Spanning Tree plus
• PXE: Preboot Execution Environment

Q

• QAM: Quadrature amplitude modulation
• Q-in-Q
• QoS Parameters
• QoS: Quality of Service
• QPPB: QoS Policy Propagation on BGP
• QPSK: Quaternary Phase Shift Keying
• QRSS: Quasi-random Signal Sequence
• Quartet Signaling
• Query
• Queue
• Queuing Delay
• Queuing Theory
• QUIPU

R

• Race Condition Ranging
• RACE: Research on Advanced Communications in Europe
• RADSL: Rate-adaptive Asymmetric Digital Subscriber Line
• Random Early Detection
• Ranging
• RAS: Reliability, Availability, Serviceability
• Rate Limiting
• Rate Queue
• RDF: Rate Decrease Factor
• RDI: Remote Defect Indication
• Re-Activation
• Reassembly
• Redirect
• Redirect Server
• Redirector
• Redundancy
• Redundant System
• Reed-Solomon Encoder
• Reference Point
• Registrar
• Registered Endpoint
• Registered Ports
• Relay
• Reliability
• Reload
• Remote Assistance
• Remote Bridge
• Remote Computer
• Remote DBA: Remote Database Administration
• Remote System
• Rendezvous Point
• Repeater
• Repeating Hub
• Residential Gateway
• Reverse Telnet
• RCF: Registration ConFirmation
• RFC: Request For Comments
• RFP: Request for Proposal
• RFS: Remote File System
• RIF: Rate Increase Factor
• RIF: Routing Information Field
• RII: Routing Information Identifier
• RIM: Request Initialization Mode
• Ring
• Ring Group
• Ring Latency
• Ring Monitor
• Ring Network
• Ring Topology
• RJE: Remote Job Entry
• RM: Resource Management
• RM-CDT: RM-cell transfer delay
• RM-CDV: RM-Cell Delay Variation
• RM-CER: RM-Cell Error Ratio
• RM-CLR: RM-Cell Loss Ratio
• RM-CMR: RM-Cell Misinsertion Ratio
• RM-CTD: RM-Cell Transfer Delay
• RNIE: Redirecting Number Information Element
• Roaming Service
• ROLC: Routing Over Large Clouds
• Root Account
• Root Bridge
• Rotary Groups
• Route
• Route Distinguisher
• Route Extension
• Route Flapping
• Route Map
• Route Summarization
• Routed Bridge Encapsulation
• Routed Protocol
• Router
• Routing
• Routing Daemon
• Routing Domain
• Routing Metric
• Routing Protocol
• Routing Redistribution
• Routing Switch
• Routing Table
• Routing Update
• RPC Server: Remote Procedure Call Server
• RPF: Reverse Path Forwarding
• RPR: Restore Path Request
• RR: Relative Rate
• RRDtool