CCNA Exploration 2, Chapter 9. “EIGRP” Worksheet #1

Name:

1.  Enhanced Interior Gateway Routing Protocol (EIGRP) is a ______, ______routing protocol that was released in 1992 with IOS 9.21. As its name suggests, EIGRP is an enhancement of Cisco IGRP (Interior Gateway Routing Protocol). Both are ______protocols and only operate on ______routers.

2.  EIGRP includes several features that are not commonly found in other distance vector routing protocols. These features include:

3.  EIGRP used to be commonly referred to as a “hybrid” routing protocol. Why does Cisco no longer refer to EIGRP this way?

4.  List and compare the operations of EIGRP as compared to Traditional Distance Vector Routing Protocols:

5.  Explain the use of metrics used by IGRP and EIGRP:

6.  List and Explain the important changes EIGRP implements through the use of the DUAL algorithm:

7.  How does EIGRP achieve loop-free paths without the use of holdown timers?

8.  List the three Type/Length/Values (TLV) types, and their Hexadecimal equivalent, that are found in an encapsulated EIGRP Message:

9.  What is the value of the protocol field in an EIGRP packet header?

10. What is the IP destination multicast address in an EIGRP packet header?

11. What is the destination MAC multicast address in an EIGRP packet header?

12. What are the EIGRP packet types that may be specified in the Opcode field of the EIGRP packet header?

13. What is the Autonomous System (AS) number and why is it significant to the EIGRP routing process?

14. What are the K1 and K3 fields used to specify?

15. The ______is the amount of time the EIGRP neighbor receiving a message should wait before considering the advertising router to be down.

16. Delay is calculated as the ______in units of ______.

17. Bandwidth is the ______of any interface along the route.

18. Explain the difference in the IP Internal message and the IP external message:

19. EIGRP has the capability for routing several different protocols including IP, IPX, and AppleTalk using ______. ______are responsible for the specific routing tasks for each ______layer protocol.

20. Explain RTP and how EIGRP uses it. What is the difference between “reliable” RTP and “unreliable” RTP?

21. RTP can send packets either as a ______or a ______. Multicast EIGRP packets use the reserved multicast address of ______.

22. Explain the Hello Packets that EIGRP uses:

23. Explain Update and ACK packets:

24. Explain Query and Reply Packets:

25. An EIGRP router assumes that as long as it is receiving ______from a neighbor, the neighbor and its routes remain viable.

26. On most networks EIGRP Hello packets are sent every ______seconds. On multipoint nonbroadcast multiaccess networks (NBMA) such as X.25, Frame Relay, and ATM interfaces with access links of T1 (1.544 Mbps) or slower, Hellos are ______every ______seconds.

27. By default, the hold time is ______times the Hello interval, or ______seconds on most networks and ______seconds on low speed NBMA networks.

28. Explain how EIGRP uses Partial and Bounded updates to minimize bandwidth usage:

29. EIGRP has a default administrative distance of ______for internal routes and ______for routes imported from an external source, such as default routes.

30. EIGRP has a third AD value, of ______, for summary routes.

31. What is an autonomous system (AS)?

32. How are autonomous systems uniquely identified? Explain in detail:

33. Explain what types of organizations need autonomous system numbers and why:

34. Explain Process ID numbers as used by EIGRP:

35. Explain the command that is used to enable EIGRP on a router:

36. What is an “adjacency”?

37. What is a “wildcard mask” and why is it used with EIGRP?

38. Use the ______command to view the ______table and verify that EIGRP has established an ______with its neighbors.

39. If the ping to an adjacent (neighbor) router is successful and EIGRP still does not see the router as a neighbor, what configurations should you examine?

40. EIGRP routes are denoted in the routing table with a ____, which stands for ______.

41. What is a Null0 Summary Route and why is it important with EIGRP?

42. Be sure to do the Packet Tracer Exploration 9.2.6: “Configure and Verify EIGRP Routing”.