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Composite
Exam Number: 642-892 Exam
Associated Certifications: Composite
Duration: 321 Q&As
Available Language(s): English
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QUESTION 75
While troubleshooting an EIGRP routing problem you notice that one of the
PassGuide routers have generated a large number of SIA messages. What are two
possible causes for EIGRP Stuck-In-Active routes? (Select two)

A. Some query or reply packets are lost between the routers.
B. The neighboring router starts receiving route updates from this router.
C. A failure causes traffic on a link between two neighboring routers to flow in only one
direction (unidirectional link).
D. The neighboring router stops receiving ACK packets from this router.

Answer: A, C

Explanation:
The SIA state means that an EIGRP router has not received a reply to a query from one
or more neighbors within the time allotted (approximately 3 minutes). When this
happens, EIGRP clears the neighbors that did not send a reply and logs a
DUAL-3-SIAerror message for the route that went active
Details: http://www.cisco.com/warp/public/103/18.html#topic1
QUESTION 77
EIGRP uses five generic packet types (hello, updates, queries, replies,
acknowledgements). If you wished to view the statistics for these packets, which IOS
command should you use?

A. debug eigrp packets
B. show ip eigrp traffic
C. show ip eigrp topology
D. show ip eigrp neighbors

Answer: B

Explanation:
The show ip eigrp traffic command displays the number of Enhanced IGRP (EIGRP)
packets sent and received.
Example:
642-892

The following is sample output from the show ip eigrp traffic command:
Router# show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 77
Hellos sent/received: 218/205
Updates sent/received: 7/23
Queries sent/received: 2/0
Replies sent/received: 0/2
Acks sent/received: 21/14
Reference
:http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_command_reference_chapter09186a0080
0

QUESTION 78
While troubleshooting a routing problem on the PassGuide EIGRP network you
discover that one of the routers is failing to establish adjacencies with its neighbor.
What is a likely cause of this problem between neighbors? (Select two)

A. The K-values do not match.
B. The hold times do not match.
C. The hello times do not match.
D. The AS numbers do not match.

Answer: A, D

Explanation:
Peer relationships and adjacencies between routers will not be formed between EIGRP
routers if the neighbor resides in a different autonomous system or if the
metric-calculation mechanism (K values) is misaligned for that link.
Incorrect Answers:
B, C: It is possible for two routers to become EIGRP neighbors even though the hello and
hold timers do not match.
QUESTION 79
While troubleshooting an EIGRP routing issue, you are seeing a high number of
SIA (stuck in active) routes. Which of the following are causes of a route becoming
SIA? (Select two)

A. Some query or reply packets are lost between the routers.
B. The neighboring router stops receiving ACK packets from this router.
C. The neighboring router starts receiving route updates from this router.
D. A failure causes traffic on a link between two neighboring routers to flow in only one
direction (unidirectional link).

Answer: A, D

Explanation:

The acknowledgement does not reach the destination or they are too delayed. This is
normally due to too many routing topology changes, or a router with insufficient
memory.
Note: In some circumstances, it takes a very long time for a query to be answered. So
long, in fact, that the router that issued the query gives up and clears its connection to the
router that isn’t answering, effectively restarting the neighbor session. This is known as a
stuck in active (SIA) route. The most basic SIA routes occur when it simply takes too
long for a query to reach the other end of the network and for a reply to travel back.
Incorrect Answers:
B: Ack packets don’t reply to Query, only Reply do.
C: Does not apply to SIA. This is the normal operation of EIGRP.
Reference:http://www.cisco.com/warp/public/103/eigrp3.html
The Composite exam (642-892) is the quickest way for currently certified Cisco Certified Network Professionals (CCNP®) and Cisco Certified Design Professionals (CCDP®) to obtain recertification. The exam tests skills and knowledge pertaining to the Building Scalable Cisco Internetworks (BSCI) and Building Cisco Managed Switched Networks (BCMSN) courses. Composite may be taken to recertify CCNP and CCDP certifications; it may also be taken in place of the BSCI and BCMSN exams required for CCNP and CCDP certifications. Candidates must successfully pass both routing and switching subsections of the Composite exam to successfully pass the exam
# Questions and Answers : 326 Q&As
Latest updated: October 24th , 2008
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