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QUESTION 21:
In an effort to decrease the size of the routing tables in the PassGuide network,
summarization is being configured on all routers. Where in an EIGRP network is it
most appropriate to implement route summarization?
A. At area border routers
B. At autonomous system boundary routers
C. It is done automatically by the DR router in each area
D. Manually at any interface of any EIGRP router within the network
E. In backbone area routers.
Answer: B
Explanation:
Enhanced IGRP performs route summarization at classful network boundaries by default.
Automatic route summarization occurs at major network boundaries. ASBRs
(autonomous system boundary routers) are used at the major network boundaries.
Incorrect Answers
A, C, E: Area Border Router and DR are used in OSPF, but not in EIGRP. Backbone area
routers are also concepts used in OSPF, but not in EIGRP.
D: Manual summarization can be done in any interface at any router within network, but
this is not the preferred solution. Summarizing manually at each router can result in black
hole routing. However, done properly this is an acceptable practice. If the question calls
for more than one answer then the best choice would be B and D.
QUESTION 22:
The PassGuide network is using route summarization to decrease the size of the
routing tables. In an EIGRP network, which of the following describes the best
method for implementing summarization?
A. At WAN interfaces.
B. Manually at major network boundaries.
C. Dynamically at discontiguous interfaces.
D. Dynamically at major network boundaries.
Answer: D
Explanation:
642-901
www.actualtest.org – The Power of Knowing
EIGRP supports arbitrary route summarization. Route summarization takes place
automatically at major network boundaries (where network are supernetted).
Note: Route summarization is the consolidation of advertised addresses.
Incorrect Answers
A: Manually configuring summarization at WAN boundaries is not necessarily
recommended in all situations. If the routers belong to the same major network boundary
then summarization should not be configured.
B: Route summarization is automatic in EIGRP, and it is recommended to keep the
defaults.
C: Route summarization should only be applied at contiguous interfaces. Choosing this
option would most likely lead to black hole routing, making many networks unreachable.
QUESTION 23:
The PassGuide network is running EIGRP on the T1 links within their NBMA frame
relay network. By default what would the hold time be for hello packets across these
WAN links?
A. 30 seconds
B. 60 seconds
C. 90 seconds
D. 180 seconds
E. 5 Seconds
Answer: D
Explanation:
EIGRP sends hello packets every 5 seconds on high bandwidth links and every 60
seconds on low bandwidth multipoint links. The hold time is typically three times the
hello interval. In this scenario, on slow NBMA media, hold time will be 180 seconds.
Incorrect Answers:
A, B, C: Although the hello timers can be manually configured for these values, they are
not the default time.
E: This is the default for high bandwidth links, such as Ethernet networks.
Reference: Enhanced Interior Gateway Routing Protocol

http://www.cisco.com/warp/public/103/eigrp1.html

QUESTION 24:
EIGRP is being used as the routing protocol within the PassGuide 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
642-901
www.actualtest.org – The Power of Knowing
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

QUESTION 25:
EIGRP is being used as the routing protocol on the PassGuide 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

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