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CCIE Vocab
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CCIE Vocab
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1. The term to describe a router that is neither the DR nor the BDR on a subnet that elects a DR and BDR.

2. An MPLS term referring to the MPLS label just before the IP header. Also called the VPN label when implementing MPLS VPNs.

3. Operates in dense mode and depends on its own unicast routing protocol that is similar to RIP to perform its multicast functions.

4. A Cisco IOS queuing tool most notable for its automatic classification of packets into separate per-flow queues.

5. A type of OSPF stub area for which neither external (type 5) LSAs are introduced - nor type 3 summary LSAs; instead - the ABRs originate and inject default routes into the area. External routes cannot be injected into a totally stubby area.

6. Maximum Segment Size.

7. An 802.1d STP port state in which the port does not send or receive frames - except for listening for received Hello BPDUs.

8. Out of Frame.

9. A term referring to the MQC service-policy command - which is used to enable a policy map on an interface.

10. An ITU standard Frame Relay header - including the DLCI - DE - FECN - and BECN bits in the LAPF header - and a frame check in the LAPF trailer.

11. 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.

12. Static length subnet masking.

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

14. Virtual LAN.

15. A router that is allowed to receive a packet from an OSPF router and then forward the packet to another OSPF router.

16. 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.

17. The definitions for a particular set of data variables - with those definitions following the SMI specifications. See also SMI.

18. The content engine in a WCCP cluster - which determines how traffic will be distributed within the cluster.

19. The first 4 bits of the first octet must be 1110. The last 28 bits are unstructured.

20. A DiffServ PHB that defines eight values that provide backward compatibility with IP Precedence.

21. A type of OSPF packet used to exchange and acknowledge LSA headers. Sometimes called DBD.

22. With OSPF - the encapsulation of OSPF messages inside IP - to a router with which no common subnet is shared - for the purpose of either mending partitioned areas or providing a connection from some remote area to the backbone area.

23. A style of attack in which an ICMP Echo is sent with a directed broadcast (subnet broadcast) destination IP address - and a source address of the host that is being attacked. The attack can result in the Echo reaching a large number of hosts - all of

24. 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.

25. 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.

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