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CCIE Vocab

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1. In MPLS - a term used to define a label that an LSR learned from a neighboring LSR.

2. The number of beacons that governs how often multicast frames are sent over a wireless LAN.

3. The RMON function of sending a notification to an RMON collector or the console. Triggered by an RMON event.

4. The Cisco IOS feature by which special short key sequences can be used to move the cursor inside the current command line to more easily change a command.

5. A Cisco IOS configuration tool for routing protocols by which routing updates may be filtered.

6. When a PIM-SM router switches from RPT to SPT - it sends a PIM-SM Prune message for the source and the group with the RP bit set to its upstream router on the shared tree. RFC 2362 uses the notation PIM-SM (S - G) RP-bit Prune for this message.

7. Exterior Gateway Protocol.

8. With Spanning Tree Protocol - the single port on each LAN segment from which the best Hello BPDU is forwarded.

9. A possible side effect of a scheduler that performs strict-priority scheduling of a queue - which can result in lower-priority queues getting little or no service.

10. A set of QoS RFCs that redefines the IP header's ToS byte - and suggests specific settings of the DSCP field and the implied QoS actions based on those settings.

11. In IP routing - a term referring to the process of forwarding packets through a router.

12. The encapsulation of EAP messages directly inside LAN frames. This encapsulation is used between the supplicant and the authenticator.

13. As defined in RFC 3623 - graceful restart allows for uninterrupted forwarding in the event that an OSPF router's OSPF routing process must restart. The router does this by first notifying the neighbor routers that the restart is about to occur; the n

14. Port Address Translation.

15. A local Cisco-proprietary BGP setting that is not advertised to any peers. A larger value is considered to be better.

16. The original standardized set of generic SNMP MIB variables - defined in RFC 1158.

17. A mapping between each DSCP value and a corresponding CoS value - often used in Cisco LAN switches when performing classification for egress queuing.

18. Superframe

19. An integer setting for EIGRP and IGRP. Any FS route whose metric is less than this variance multiplier times the successor's metric is added to the routing table - within the restrictions of the maximum-paths command.

20. In MPLS VPNs - an entity in a single router that provides a means to separate routes in different VPNs. The VRF includes per-VRF instances of routing protocols - a routing table - and an associated CEF FIB.

21. Policing in which a single rate is metered - and packets are placed into one of two categories (conform or exceed).

22. A queuing scheduler's logic by which - if a particular queue has packets in it - those packets always get serviced next.

23. A feature of Ethernet NICs. When the NIC transmits an electrical signal - it "loops" the transmitted electrical current back onto the receive pair. By doing so - if another NIC transmits a frame at the same time - the NIC can detect the overlapping r

24. A WFQ term referring to its drop logic - which is similar to tail-drop behavior.

25. The combination of MPLS labels and links over which a packet will be forwarded over an MPLS network - from the point of ingress to the MPLS network to the point of egress.

26. An architecture and set of documents that defines Cisco's best recommendations for how to secure a network.

27. A switch feature that limits the number of allowed MAC addresses on a port - with optional limits based on the actual values of the MAC addresses.

28. A CBWFQ and LLQ term referring to the bandwidth on an interface that is neither reserved nor allocated via a priority command.

29. Flush timer.

30. A type of logic for how a router uses a default route. When a default route exists - and the class A - B - or C network for the destination IP address does not exist in the routing table - the default route is used. If any part of that classful netwo

31. The IP address used by hosts as the default gateway in a VRRP configuration. This address is shared by two or more VRRP routers - much as HSRP works.

32. A BGP path attribute that lists ASNs through which the route has been advertised. The AS_PATH includes four types of segments: AS_SEQ - AS_SET - AS_CONFED_SEQ - and AS_CONFED_SET. Often - this term is used synonymously with AS_SEQ

33. A NAT term describing an IP address representing a host that resides outside the enterprise network - with the address being used in packets inside the enterprise network.

34. Reverse ARP.

35. An STP timer that dictates the interval at which the Root switch generates and sends Hello BPDUs.

36. From a Layer 1 perspective - the process of using special strings of electrical signals over a transmission medium to inform the receiver as to which bits are overhead bits - and which fit into individual subchannels.

37. The common set of IOS configuration commands that is used with each QoS feature whose name begins with "Class-Based."

38. A single address in each subnet for which packets sent to this address will be broadcast to all hosts in the subnet. It is the highest numeric value in the range of IP addresses implied by a subnet number and prefix/mask.

39. A process whereby a switch - when making a forwarding decision - uses not only Layer 2 logic but other OSI layer equivalents as well.

40. IP routing The simplest MPLS application - involving the advertisement of an IGP to learn IP routes - and LDP or TDP to advertise labels.

41. A mechanism used by TCP senders to limit the dynamic window for a TCP connection - to reduce the sending rate when packet loss occurs. The sender considers both the advertised window size and CWND - using the smaller of the two.

42. A T1 alarm state that occurs when a device receives a Yellow Alarm signal. This typically means that the device on the other end of the line is in a Red Alarm state.

43. A protocol used for reliable multicast and unicast transmissions. Used by EIGRP.

44. A standard (RFC 951) protocol by which a LAN-attached host can dynamically broadcast a request for a server to assign it an IP address - along with other configuration settings - including a subnet mask and default gateway IP address.

45. Orthogonal frequency division multiplexing.

46. Excess Burst.

47. Internal BGP.

48. A Cisco-proprietary feature. After a Cisco multicast router receives IGMP Join or Leave messages from hosts - it communicates to the connected Cisco switches - telling them which hosts (based on their unicast MAC addresses) have joined or left each m

49. An optimized Layer 3 forwarding path through a router or switch. CEF optimizes routing table lookup by creating a special - easily searched tree structure based on the contents of the IP routing table. The forwarding information is called the Forward

50. Secure Shell protocol used for character-oriented command-line access and configuration. A highly secure alternative to Telnet.