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:
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CCNA Exploration 2, Chapter 9. “EIGRP” Worksheet #1
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:
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CCNA Exploration 2, Chapter 9. “EIGRP” Worksheet #1
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?
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CCNA Exploration 2, Chapter 9. “EIGRP” Worksheet #1
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?
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CCNA Exploration 2, Chapter 9. “EIGRP” Worksheet #1
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.
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CCNA Exploration 2, Chapter 9. “EIGRP” Worksheet #1
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:
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CCNA Exploration 2, Chapter 9. “EIGRP” Worksheet #1
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?
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CCNA Exploration 2, Chapter 9. “EIGRP” Worksheet #1
42. Be sure to do the Packet Tracer Exploration 9.2.6: “Configure and Verify EIGRP
Routing”.
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