Usesful Acronyms for CCNA/CCNP

1. 3DES Triple DES
2. 6-to-4 IPv6-to-IPv4
3. AAA Authentication, authorization, accounting
4. ABR Area Border Router
5. ACK acknowledge, acknowledgment, acknowledgment bit in a TCP segment
6. ACL access control list
7. ACS Access Control Server
8. AD advertised distance
9. ADSL asymmetric DSL
10. AES Advanced Encryption Standard
11. AfriNIC African Network Information Centre
12. AH Authentication Header
13. ALG application layer gateway
14. ANSI American National Standards Institute
15. AON Application-Oriented Networking
16. API application programming interface
17. APNIC Asia Pacific Network Information Center
18. ARCNET Attached Resource Computer Network
19. ARIN American Registry for Internet Numbers
20. ARP Address Resolution Protocol
21. AS autonomous system
22. ASA Adaptive Security Appliance
23. ASBR Autonomous System Boundary Router
24. ATM Asynchronous Transfer Mode
25. AToM Any Transport over MPLS
26. BDR Backup Designated Router
27. BGP Border Gateway Protocol
28. BGPv4 or BGP-4 BGP Version 4
29. BIS Bump-in-the-Stack
30. BPDU bridge protocol data unit
31. bps bits per second
32. BRI Basic Rate Interface
33. BSCI Building Scalable Cisco Internetworks
34. CATV community antenna television
35. CBAC context-based access control
36. CCDP Cisco Certified Design Professional
37. CCNA Cisco Certified Network Associate
38. CCNP Cisco Certified Network Professional
39. CCSP Cisco Certified Security Professional
40. CDP Cisco Discovery Protocol
41. CE Customer Edge
42. CEF Cisco Express Forwarding
43. CEFv6 Cisco Express Forwarding for IPv6
44. CIDR classless interdomain routing
45. CIR committed information rate
46. CMTS Cable modem termination system
47. CO Central office
48. CoS class of service
49. CPE customer provider edge
50. customer premise equipment
51. CPU central processing unit
52. CSM Cisco Security Manager
53. CSMA/CD carrier sense multiple access collision detect
54. DAD Duplicate address detection
55. DBD database description packets
56. DDP database description packets
57. DES Data Encryption Standard
58. DESGN Designing for Cisco Internetwork Solutions
59. DHCP Dynamic Host Configuration Protocol
60. DHCPv6 DHCP for IPv6
61. DiffServ Differentiated Services
62. DLCI data-link connection identifier
63. DMVPN Dynamic multipoint VPN
64. DNA DoNotAge
65. DNS Domain Name Service or Domain Name System
66. DoD Department of Defense
67. DR designated router
68. DSL digital subscriber line
69. DSLAM DSL access multiplexer
70. DUAL Diffusing Update Algorithm
71. E1 External Type 1
72. E2 External Type 2
73. EAP Extensible Authentication Protocol
74. EBGP External BGP
75. e-bit external bit
76. EGP Exterior Gateway Protocol
77. EIGRP Enhanced Interior Gateway Routing Protocol
78. EoMPLS Ethernet over MPLS
79. ESP Encapsulating Security Payload
80. EUI-64 extended universal identifier 64-bit
81. FD feasible distance
82. FCAPS Fault, Configuration, Accounting, Performance, and Security
83. FDDI Fiber Distributed Data Interface
84. FEC forwarding equivalence class
85. FIB Forwarding Information Base
86. FLSM fixed-length subnet mask
87. FS feasible successor
88. FTP File Transfer Protocol
89. Gbps gigabits per second
90. GET Group encrypted transport
91. GRE Generic Routing Encapsulation
92. HDLC High-Level Data Link Control
93. HFC hybrid fiber-coaxial
94. HSRP Hot Standby Router Protocol
95. HTTP Hypertext Transfer Protocol
96. Hz hertz
97. IANA Internet Assigned Numbers Authority
98. IBGP Internal BGP
99. ICMP Internet Control Message Protocol
100. ID identifier
101. IDP initial domain part
102. IDRP Interdomain Routing Protocol
103. IEEE Institute of Electrical and Electronics Engineers
104. IETF Internet Engineering Task Force
105. IGMP Internet Group Management Protocol
106. IGP Interior Gateway Protocol
107. IGRP Interior Gateway Routing Protocol
108. IIN Intelligent Information Network
109. IKE Internet Key Exchange
110. IntServ Integrated Services
111. IOS Internet Operating System
112. IP Internet Protocol
113. IPCP Internet Protocol Control Protocol
114. IPM Internetwork Performance Monitor
115. IPsec IP security
116. IPv4 IP Version 4
117. IPv6 IP Version 6
118. IPX Internetwork Packet Exchange
119. IS 1. information systems
120. 2. intermediate system
121. ISAKMP Internet Security Association and Key Management Protocol
122. ISATAP Intra-Site Automatic Tunnel Addressing
123. IS-IS Intermediate System-to-Intermediate System
124. IS-ISv6 IS-IS for IPv6
125. ISDN Integrated Services Digital Network
126. ISO International Organization for Standardization
127. ISP Internet service provider
128. ISR integrated services router
129. ITIL IT Infrastructure Library
130. ITU-T International Telecommunication Union Telecommunication
131. Standardization Sector
132. Acronyms and Abbreviations 5
133. kbps kilobits per second
134. L3 Level 3
135. LACNIC Latin American and Caribbean IP Address Regional Registry
136. LAN local-area network
137. LANE LAN Emulation
138. LS link state
139. LSA link-state advertisement
140. LSAck link-state acknowledgment
141. LSDB link-state database
142. LSP link-state packet
143. LSR link-state request
144. LSU link-state update
145. M metric
146. MAC Media Access Control
147. MAN metropolitan-area network
148. MB megabyte
149. MBGP Multiprotocol BGP
150. Mbps megabits per second
151. MD5 message digest algorithm 5
152. MED Multi-Exit-Discriminator
153. MIB Management Information Base
154. MLD Multicast Listener Discovery
155. MOSPF Multicast OSPF
156. MP-BGP4 Multiprotocol Border Gateway Protocol Version 4
157. MPLS Multiprotocol Label Switching
158. ms Millisecond
159. MTU maximum transmission unit
160. NA Neighbor advertisement
161. NAC Network Admission Control
162. NAT Network Address Translation
163. NAT-T NAT Traversal
164. NAT-PT NAT-Protocol Translation
165. NBMA nonbroadcast multiaccess
166. NCP Network control protocol
167. ND Neighbor discovery
168. NLRI Network Layer Reachability Information
169. NMS Network Management System
170. NS Neighbor solicitation
171. NSSA not-so-stubby area
172. NTP Network Time Protocol
173. ODR on-demand routing
174. OER Optimized Edge Routing
175. OS operating system
176. OSI Open System Interconnection
177. OSPF Open Shortest Path First
178. OSPFv2 OSPF Version 2
179. OSPFv3 OSPF Version 3
180. OUI organizationally unique identifier
181. P2P Point-to-point
182. PAT Port Address Translation
183. PBR policy-based routing
184. PBX Private Branch Exchange
185. PDM protocol-dependent module
186. PDU protocol data unit
187. PE Provider Edge
188. POP point of presence
189. POTS plain old telephone service
190. PPDIOO Prepare, Plan, Design, Implement, Operate, Optimize
191. PPP Point-to-Point Protocol
192. PPPoA PPP over ATM
193. PPPoE PPP over Ethernet
194. pps packets per second
195. PPTP Point-to-Point Tunneling Protocol
196. PRI Primary Rate Interface
197. PSTN public switched telephone network
198. PVC permanent virtual circuit
199. QoS quality of service
200. RA Router advertisement
201. RF Radio frequency
202. RFC Request For Comments
203. RIB Routing Information Base
204. RIP Routing Information Protocol
205. RIPE-NCC Réseaux IP Européens-Network Coordination Center
206. RIPng Routing Information Protocol new generation
207. Acronyms and Abbreviations 7
208. RIPv1 Routing Information Protocol Version 1
209. RIPv2 Routing Information Protocol Version 2
210. RIR Regional Internet registries
211. RPF Reverse Path Forwarding
212. RR route reflector
213. RRI reverse route injection
214. RS Router solicitation
215. RSVP Resource Reservation Protocol
216. RTO retransmit timeout
217. RTP Reliable Transport Protocol
218. RTT round-trip time
219. RTTMON Round-Trip Time Monitor
220. SA security association
221. SDSL Symmetric DSL
222. SHA Secure hash
223. SHDSL single-pair high-speed DSL
224. SIA stuck in active
225. SIN ships in the night
226. SLAs Service level agreements
227. SM source metric
228. SMTP Simple Mail Transfer Protocol
229. SNAP Subnetwork Access Protocol
230. SNMP Simple Network Management Protocol
231. SOHO small office/home office
232. SONA Service-Oriented Network Architecture
233. SP Service Provider
234. SPF shortest path first
235. SPT shortest path tree
236. SPX Sequenced Packet Exchange
237. SRTT smooth round-trip time
238. ssh secure shell
239. SSL Secure socket layer
240. STP 1. shielded twisted-pair 2. Spanning Tree Protocol
241. SVC switched virtual circuit
242. SYN Synchronize
243. TCP Transmission Control Protocol
244. TCP/IP Transmission Control Protocol/Internet Protocol
245. TFTP Trivial File Transfer Protocol
246. TLV Type, Length, Value
247. TMN Telecommunications Management Network
248. ToS type of service
249. TTL Time To Live
250. UDP User Datagram Protocol
251. U/L Universal/Local
252. URL Uniform Resource Locator
253. UTP unshielded twisted-pair
254. VC virtual circuit
255. VDSL very high bitrate DSL
256. VLAN virtual LAN
257. VLSM variable-length subnet mask
258. VoD video on demand
259. VoIP Voice over IP
260. VPN virtual private network
261. VRF VPN routing and forwarding
262. VT video telephony
263. VTI Virtual tunnel interface
264. VTP VLAN Trunking Protocol
265. vty virtual terminal
266. WAN wide-area network
267. WAAS Wide Area Application Services
268. WCCP Web Cache Communications Protocol
269. WFQ weighted fair queuing
270. WiMAX Worldwide Interoperability for Microwave Access
271. WLAN wireless LAN
272. WRED weighted random early detection
273. WWW World Wide Web
274. ZBF zone-based firewall