Term Definition
ACE Access Control Entry
ACL Access Control Lists
AD Administrative Distance
ADSL Asymmetrical DSL
AIM Advanced Integration Module
AM Amplitude Modulation
ANSI American National Standard Institute
AP Access Point (to wireless network)
ARP Address Resolution Protocol
ARPANET Advanced Research Projects Agency Network
ASICs Application Specific Integrated Circuits
auto-MDIX automatic medium-dependent interface crossover
AUX Auxiliary (port)
BGP Border Gateway Protocol (a dynamic routing protocol)
BIA Burned-in Address (IEEE Ethernet MAC address as manufactured)
bps bit per second
BYOD Bring Your Own Device: any device, to any content, in any manner
CAM Content Addressable Memory
CCENT Cisco Certified Entry Network Technician
CCNA Cisco Certified Network Associate routing and switching certification
CDP Cisco Discovery Protocol
CEF Cisco Express Forwarding
CFI Canonical Format Identifier (in VLAN)
CGMP Cisco Group Management Protocol
CHADDR Client Hardware Address (in DHCPv4 protocol)
CIADDR Client IP Address (in DHCPv4 protocol)
CIDR Classless Inter-Domain Routing
Cisco IOS Cisco Internetwork Operating System
CLI Command Line Interface
CLM Cisco License Manager
CoS Class of Service (priority for voice services)
CPU Central Processing Unit
CRC Cyclic Redundancy Check value
CSMA/CA Carrier Sense Multiple Access/Collision Avoidance. Used in IEEE 802.11 WLAN
CSMA/CD Carrier Sense Multiple Access/Collision Detection
DAD Duplicate Address Detection (in ICMPv6 Neighbor Discovery)
DAI Dynamic ARP inspection
DCE Data Circuit-terminating Equipment
DHCP Dynamic Host Configuration Protocol
DNS Domain Name Service
DRAM Dynamic Random Access Memory
DS Differentiated Services. Layer 3 field. Ex ToS. DSCP + ECN
DSCP Differentiated Services Code Point. First 6 bits of DS
DSL Digital Subscriber Line
DTE Data terminal equipment
DTP Dynamic Trunking Protocol
ECN Explicit Congestion Notification. Last 2 bits of DS
EGP Exterior Gateway Protocol RFC 827
EH Extension Headers. IPv6
eHWIC Enhanced High-speed WAN Interface Card
EIA Electronic Industries Alliance; prima del 1997 era Electronic Industries Association; sciolta nel 2011 per dare luogo alle sue componenti, tra cui (vedi) TIA.
EIGRP Enhanced Interior Gateway Routing Protocol (a routing protocol)
EMI Electo Magnetic Interferences
EUI-64 Extended Unique Identifier 64 bit (in SLAAC)
EULA End User License Agreement
FCS Frame Check Sequence (data link layer, trailer field)
FDDI Fiber Distributed Data Interface
FIB Forwarding Information Base
FM Frequency Modulation
Flash It’s an erasable and reprogrammable ROM. it holds the Cisco IOS images
FTP File Transfer Protocol RFC 765
FTTH Fiber-to-the-home
Gb/s Gigabit per second == 10^9 bps
GIADDR Gateway IP Address (in DHCPv4 protocol)
GUI Graphical user Interface
HPC High Performance Computing applications
HTTP Hypertext Transfer Protocol
HWIC High-speed WIC
IAB Internet Architecture Board
IANA Internet Assigned Numbers Authority
ICANN Internet Corporation for Assigned Names and Numbers
ICMP Internet Control Message Protocol. layer 3 Time Exceeded
ICND1 Interconnecting Cisco Networking Devices part 1 (book/course)
IEEE Institute of Electrical and Electronics Engineering
IESG Internet Engineering Steering Group (in IETF)
IETF Internet Engineering Task Force
IFS Cisco IOS File System
IGRP Interior Gateway Routing Protocol (a routing protocol)
IHL Internet Header Length. layer 3
IID Interface ID (IPv6 address: host part)
Intf Interface (used in Cisco courses)
IOS Cisco Internetwork Operating system
IP Internet protocol
IPS Intrusion Prevention System
IPTV Internet Protocol Television
IRC Internet Realy Chat
IRSG Internet Research Steering Group (in IRTF)
IRTF Internet Research Task Force
IS-IS Intermediate System-to-Intermediate System (a routing protocol)
ISO International Organization for Standardization
ISOC Internet Society
ISP Internet Service Provider
ISRs Integrated Service Routers
ISR G2 Cisco Integrated Services Routers Generation Two
ITU International Telecommunication Union
ITU-T International Telecommunications Union-Telecommunication Standardization Sector
kb/s Kilobit per second == 1000 bps
LAN Local Area Network
LC Lucent connector (a type of fiber optical media connetor)
LED Light Emitting Diodes
LLC Logical Link Control (data link sublayer)
LLDP Link Layer Discovery Protocol
LOM lights-out management: one form of out-of-band management. It allows a system administrator to monitor and manage servers and other network-attached equipment by remote control regardless of whether the machine is powered on, or whether an operating system is installed or functional.
MAC Media Access Control (data link sublayer)
Mb/s Megabit per second == 1,000,000 bps
MLS multilayer switching
MMF Multi mode Fiber
MTU Maximum Transmission Unit
NA Neighbor Advertisement message (in ICMPv6)
NAT Network Address Translation
NAT64 Network Address Translation for IPv6
NAT-PT Network Address Translation-Protocol Translation (in IPv6, deprecated in favor of NAT64)
NetBIOS Network Basic Input/Output System (microsoft, layer 3-5: transport-session)
NIC Network Interface card
NS Neighbor Solicitation message (in ICMPv6)
NTP Network Time Protocol
NVRAM NonVolatile Random Access Memory. it holds the startup config.file
OOB Out Of Band management (tipically: modem)
OS Operating Systems
OSPF Open Shortest Path First
OTDR Optical Time Domain Reflectometer
OUI Organization Unique Identifier (IEEE Ethernet MAC address: first 3 bytes)
PAK Product Activation Key
PAT Port Address Translation (in NAT)
PID Product ID
PDU Protocol Data Unit
Pri user Priority (in VLAN tag)
PM Phase Modulation
POST Power-On Self-Test program
PSTN Public Switched Telephon Network
QoS Quality of Service
RA Router Advertisement message (in ICMPv6)
RAM Random Access Memory. it holds IOS, routing & arp tables, running config.file, packet buffer
RFC Request For Comments
RFI Radio Frequency Interferences
RIP Routing Information Protocol (a dynamic routing protocol)
RIP ng RIP next generation
RIR Regional Internet Registry
ROM Read Only Memory. it holds bootstrap startup program, ROM monitor firmware (limited IOS), POST
RA Router Advertising (ICMPv6)
RS Router Solicitation (ICMPv6)
RTU Right-To-Use (licensing)
SC Subscriber connector (a type of fiber optical media connetor)
SDM cisco Switch Database Manager
SDRAM Synchronous Dynamic RAM
SEC Security
SFD Start Frame Delimiter (1 byte after the 7 byte of I3E 802.3 frame preamble)
SLAAC Stateless Address Autoconfiguration (ICMPv6)
SMF Single mode Fiber
SN Serial Number
SP Service Provider
SSID Service Set IDentifier (wi-fi id)
ST Straight Tip connector (a type of fiber optical media connetor)
SVI Switch Virtual Interface: lack of physical hardware associated with it. Created in software.
TACACS Terminal Access Controller Access-Control System (login host protocol)
TAG Technical Advisory Group
Tb/s Terabit per second == 10^12 bps
TCP Transmission Control Protocol
TIA Telecommunication Industry Association; componente di EIA fino al 2011, successivamente organizzazione indipendente
TPID Tag protocol ID (in VLAN)
ToS Type of Service. Layer 3. Now DS
TSP Telecommunication Service Provider
TTL Time To Limit. layer 3 IPv4
UC Unified Communications
UDI Unique Device Identifier
UDP User Datagram Protocol (connectionless transport protocol)
ULA Unique Local Address (in IPv6)
VLAN Virtual LAN
VoIP Voice Over IP
VPN Vitual Private Network
VTP VLAN trunking protocol
WAN Wide Area Nework
WIC WAN Interface Card
WISP Wireless Internet Service Provider
WLAN Wireless local area networks
wmask Wildcard mask (nelle ACL)
WPAN Wireless Personal Area Network
YIADDR Your IP Address (in DHCPv4 protocol)