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CCIE Vocab

Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. With Spanning Tree Protocol - the single port on each LAN segment from which the best Hello BPDU is forwarded.






2. High Density Binary 3.






3. Router-Port Group Management Protocol.






4. Out of Frame.






5. A Layer 3 forwarding path through a router that does not optimize the forwarding path through the router.






6. On a multiaccess network - when a PIM-DM or PIM-SM router receives a Prune message - it starts a 3-second timer. If it receives a Join message on the multiaccess network from another router before the timer expires - it considers the message as an ov






7. A small FIFO queue associated with each router's physical interface - for the purpose of making packets available to the interface hardware - removing the need for a CPU interrupt to start sending the next packet out the interface.






8. An issue whereby parts of the RF signal take different paths from the source to the destination - which causes direct and reflected signals to reach the receiver at different times - and corresponding bit errors.






9. Receivers subscribe to an (S -G) channel when they request to join a multicast group. That is - they specify the unicast IP address of their multicast source and the group multicast address. SSM is typically used in very large multicast deployments s






10. A type of AS_PATH segment consisting of an ordered list of ASNs through which the route has been advertised.






11. Management Information Base.






12. A prestandard (at the time of publication) wireless LAN physical layer that offers data rates in the hundreds of megabits per second.






13. Ready To Send.






14. Link Fragmentation and Interleaving.






15. Another name for 802.1Q-in-Q. See 802.1Q-in-Q.






16. Password Authentication Protocol.






17. From one multicast router's perspective - the upstream router is another router that has just forwarded a multicast packet to that router.






18. A set of rules by which BGP examines the details of multiple BGP routes for the same NLRI and chooses the single best BGP route to install in the local BGP table.






19. An E-LSR in an MPLS VPN network whose role in a particular discussion is to receive labeled packets from other LSRs and then forward the packets as unlabeled packets to CE routers.






20. Cisco Group Management Protocol.






21. In PIM-SM - the path of the group traffic that flows from the RP to the routers that need the traffic. It is also called the root-path tree (RPT) - because it is rooted at the RP.






22. A protection against problems caused by unidirectional links between two switches. Uses messaging between switches to detect the loop - err-disabling the port when the link is unidirectional.






23. A 48-bit address that is calculated from a Layer 3 multicast address by using 0x0100.5E as the multicast vendor code (OUI) for the first 24 bits - always binary 0 for the 25th bit - and copying the last 23 bits of the Layer 3 multicast address.






24. 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.






25. Variable-length subnet masking.






26. An 802.1w RSTP port state in which the port is not the Root Port but is available to become the root port if the current root port goes down.






27. 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






28. Defined in RFC 2091 - the extensions define how RIP may send a full update once - and then send updates only when routes change - when an update is requested - or when a RIP interface changes state from down to up.






29. A message that each host sends - either in response to a router Query message or on its own - to all multicast groups for which it would like to receive multicast traffic.






30. An NTP mode in which two or more NTP servers mutually synchronize their clocks.






31. Also called VLAN trunking - a method (using either the Cisco ISL protocol or the IEEE 802.1Q protocol) to support carrying traffic between switches for multiple VLANs that have members on more than one switch.






32. A 3-bit field in an ISL header used for marking frames. Also - used generically to refer to either the ISL CoS field or the 802.1Q User Priority field.






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






34. In the context of SNMP - the Set command is sent by an SNMP manager - to an agent - requesting that the agent set a single identified variable to the stated value. The main purpose is to allow remote configuration and remote operation - such as shutt






35. A queuing tool's logic by which it selects the next packet to dequeue from its many queues.






36. Digital subscriber line - a common Internet service type for residential and business customers.






37. A characterization of a BGP path attribute in which all BGP implementations must support and understand the attribute (well known) - and all BGP Updates must include the attribute (mandatory).






38. In 802.1X - the computer that stores usernames/passwords and verifies that the correct values were submitted before authenticating the user.






39. Defined in IEEE 802.1w - a specification to enhance the 802.1d standard to improve the speed of STP convergence.






40. A message sent by a host when it wants to leave a group - addressed to the All Multicast Routers address 224.0.0.2.






41. Temporal Key Integrity Protocol.






42. The process of forwarding packets through a router. Also call IP routing.






43. The multicast addresses assigned by IANA.






44. A logical group of content engines running WCCP between them. The lead content engine determines the traffic distribution within the cluster - for optimum performance and scalability.






45. An EIGRP message that is used to ask neighboring routers to verify their route to a particular subnet. Query messages require an Ack.






46. An effort to reduce the query scope with EIGRP - using route summarization or EIGRP stub routers.






47. Forwarding Information Base.






48. A term generally describing characteristics about BGP paths that are advertised in BGP Updates.






49. Permanent virtual circuit.






50. A route that is created to represent one or more smaller component routes - typically in an effort to reduce the size of routing and topology tables.