pass4sure ccnp 642-892 v3.23 pdf version

QUESTION 24:
EIGRP is being used as the routing protocol within the Certkiller network. Which
two of the following features allow EIGRP to support classless routing? (Select two)
A. Djikstra’s algorithm
B. discontiguous subnets
C. variable length subnet masks
D. periodic update announcements
E. unequal path-cost load balancing
Answer: B, C
Explanation:
B: Discontiguous subnets are supported by EIGRP. This is a classless routing protocol
feature.
C: EIGRP support variable length subnet masks (VLSM). This is a classless routing
protocol feature.
Incorrect Answers
A: EIGRP use the DUAL algorithm, not the Djikstra’s algorithm. The Djikstra algorithm
is used by distance vector protocols. EIGRP is considered to be a hybrid routing protocol.
D: EIGRP use periodic hello messages, not update announcements. EIGRP use update
packets to convey reachability of destinations. When a new neighbor is discovered,
Update packets are sent so the neighbor can build up its. These are not periodic, however.
E: IGRP and EIGRP support unequal cost path load balancing, which is known as
variance. However, this is not a classless feature of EIGRP.
Note: Classless routing protocols include the routing mask with the route advertisement.
This enables discontiguous subnets and variable length subnet masks.
Reference: Introduction to Enhanced IGRP (EIGRP)

http://www.cisco.com/warp/public/103/1.html

How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?

http://www.cisco.com/warp/public/103/19.html

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QUESTION 25:
EIGRP is being used as the routing protocol on the Certkiller network. While
troubleshooting some network connectivity issues, you notice a large number of
EIGRP SIA (Stuck In Active) messages. What causes these SIA routes? (Select two)
A. The neighboring router stops receiving ACK packets from this router.
B. The neighboring router starts receiving route updates from this router.
C. The neighboring router is too busy to answer the query (generally caused by high CPU
utilization).
D. The neighboring router is having memory problems and cannot allocate the memory
to process the query or build the reply packet.
Answer: C, D
Explanation:
SIA routes are due to the fact that reply packets are not received. This could be caused by
a router which is unable to send reply packets. The router could have reached the limit of
its capacity, or it could be malfunctioning.
Incorrect Answers
A: Missing replies, not missing ACKs, cause SIA.
B: Routes updates do not cause SIA.
Notes: If a router does not receive a reply to all outstanding queries within 3 minutes, the
route goes to the stuck in active (SIA) state. The router then resets the neighbors that fail
to reply by going active on all routes known through that neighbor, and it re-advertises
all routes to that neighbor.
Reference: Enhanced Interior Gateway Routing Protocol

http://www.cisco.com/warp/public/103/eigrp3.html

QUESTION 26:
EIGRP is being configured on the Certkiller network. After the initial configuration,
the EIGRP routers form relationships with its peer routers. Which three of the
following statements correctly describe these peer relationships? (Select three)
A. EIGRP will form neighbors if the routers are not adjacent
B. EIGRP will not form neighbors if the metric K-values do not match.
C. EIGRP will not form neighbors if the router AS numbers do not match.
D. EIGRP will form neighbors over primary and secondary interface addressing.
E. EIGRP will form neighbors even though hello and hold timers do not match on the
peering interfaces.
Answer: B, C, E

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