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CCIE Vocab

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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. An EIGRP message that is used by neighbors to reply to a query. Reply messages require an Ack.

2. The low-order 4 bits of the configuration register. These bits direct a router to load either ROMMON software (boot field 0x0) - RXBOOT software (boot field 0x1) - or a full-function IOS image.

3. Controls access to the Internet in public wireless LANs.

4. A type of OSPF stub area that - unlike stub areas - can inject external routes into the NSSA area.

5. An EIGRP message that identifies neighbors - exchanges parameters - and is sent periodically as a keepalive function. Hellos do not require an Ack.

6. A 1-byte field in the IP header - originally defined by RFC 791 for QoS marking purposes.

7. Ethernet feature in which a NIC or Ethernet port can both transmit and receive at the same instant in time. It can be used only when there is no possibility of collisions. Loopback circuitry on NIC cards is disabled to use full duplex.

8. When subnetting a class A - B - or C address - the subnet for which all subnet bits are binary 0.

9. The mandatory contention-based 802.11 access protocol that is also referred to as CSMA/CA.

10. Dynamic Host Configuration Protocol.

11. An FRF standard for Frame Relay-to-ATM Service Interworking in which one DTE uses Frame Relay and one uses ATM.

12. Defined in FRF.11 - an FR VC that uses a slightly varied header - as compared with FRF.3 data VCs - to accommodate voice payloads directly encapsulated inside the Frame Relay LAPF header.

13. A Cisco IOS configuration tool - using the ip as-path access-list command - that defines a list of statements that match the AS_PATH BGP path attribute using regular expressions.

14. Excess Burst.

15. Inside telcos' original TDM hierarchy - a unit that combines multiple DS0s into a single channel

16. A 3-bit field in an 802.1Q header used for marking frames.

17. Aka network layer reachability information.

18. Variable-length subnet masking.

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

20. A mechanism for conserving battery power in wireless stations. The access point buffers data frames destined to sleeping stations - which wake periodically to learn from information in the beacon frame whether or not data frames are waiting for trans

21. Boot Protocol. 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.

22. An E-LSR in an MPLS VPN network whose role in a particular discussion is to receive unlabeled packets over customer links and then forward the packets as labeled packets into the MPLS network.

23. Password Authentication Protocol.

24. A bit inside the Frame Relay header that - when set - implies that congestion occurred in the direction opposite (or backward) as compared with the direction of the frame.

25. From the perspective of one routing protocol - a route that was learned by using route redistribution.

26. A process on a computing device that accepts SNMP requests - responds with SNMP-structured MIB data - and initiates unsolicited Trap messages back to an SNMP management station.

27. The feature in a Cisco IOS device by which a terminal session's previously typed commands are remembered - allowing the user to recall the old commands to the command line through a simple key sequence (for example - the up-arrow key).

28. In shaping and policing - the definition of parameters that together imply the allowed rate and bursts.

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

30. PIM-DM is a method of routing multicast packets that depends on a flood-and-prune approach. PIM Dense Mode gets its name from the assumption that there are many receivers of a particular multicast group - close together (from a network perspective).

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

32. Each 802.11 station passively monitors each RF channel for a specific amount of time and listens for beacons. Stations use the signal strengths of found beacons to determine the access point or ad hoc network with which to attempt association.

33. Expedited Forwarding.

34. A Cisco IOS configuration tool that can be used to match routing updates based on a base network address - a prefix - and a range of possible masks used inside the values defined by the base network address and prefix.

35. Cisco IOS router feature by which a route map determines how to forward a packet - typically based on information in the packet other than the destination IP address.

36. Database Description.

37. A set of all devices for which any frame sent by one of the devices would collide with any frames transmitted at the same time by any of the other devices in the set.

38. The first 6 bits of the DS field - used for QoS marking.

39. Cisco-proprietary STP feature in which switches use messaging to confirm the loss of Hello BPDUs in a switch's Root Port - to avoid having to wait for maxage to expire - resulting in faster convergence.

40. Virtual Router Redundancy Protocol.

41. Prefix list.

42. A wireless LAN physical layer that is backward compatible with 802.11b and operates at up to 54-Mbps data rates using OFDM in the 2.4-GHz band.

43. The SNMP specifications - standardized in RFCs - defining the rules by which SNMP MIB variables should be defined.

44. On a single computer - one layer provides a service to a higher layer. The software or hardware that implements the higher layer requests that the next lower layer perform the needed function.

45. 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

46. A single label and link that is part of a complete LDP. See also label switched path.

47. Customer edge.

48. A type of OSPF packet used to acknowledge LSU packets.

49. Address Resolution Protocol. Defined in RFC 826 - a protocol used on LANs so that an IP host can discover the MAC address of another device that is using a particular IP address.

50. 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.