8 04 2014
Latest 2014 Pass4sure and Lead2pass Cisco 642-902 Practice Tests (11-10)
QUESTION 11
Which is the most effective technique to contain EIGRP queries?
A. route summarization
B. configuring route filters
C. using a hierarchical addressing scheme
D. establishing separate autonomous systems
Answer: A
Explanation:
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. One of the most effective techniques for containing EIGRP queries is to use route summarization or stub networks.
Stub networks are configured in a hub and spoke network and is configured only on the stub router. The command is
router eigrp 100
eigrp stub
The result of this configuration is that the stub routers will send updates about routes they have to the hub router but the hub router will never query the stub router for updates in the event of a route being lost.
QUESTION 12
Refer to the exhibit. Given the exhibited router output, which command sequence can be added to R1 to generate a default route into the OSPF domain?
A. default-router
B. ip default-network
C. default-information originate always
D. ip default-gateway
Answer: C
QUESTION 13
Identify three characteristics of EIGRP feasible successors? (Choose three.)
A. A feasible successor is selected by comparing the advertised distance of a non-successor route to the
feasible distance of the best route.
B. If the advertised distance of the non-successor route is less than the feasible distance of best route, then
that route is identified as a feasible successor.
C. If the successor becomes unavailable, then the feasible successor can be used immediately without
recalculating for a lost route.
D. The feasible successor can be found in the routing table.
E. Traffic will be load balanced between feasible successors with the same advertised distance.
Answer: ABC
Explanation:
http://packetlife.net/blog/2010/aug/9/eigrp-feasible-successor-routes/
QUESTION 14
What are three kinds of OSPF areas? (Choose three.)
A. stub
B. active
C. remote
D. backbone
E. ordinary or standard
Answer: ADE
QUESTION 15
A network administrator assigns a multicast address of 239.255.8.5 to an application running on a device with an Ethernet MAC address of 01.b2.7d.05.f1.80. Which Layer 2 multicast address will this device use?
A. 01.00.5e.7F.08.05
B. 01.b2.7d.05.f1.80
C. 01.b2.7d.0a.08.05
D. 01.00.5e.05.f1.80
E. ff.ff.ff.ff.ff.ff
Answer: A
QUESTION 16
A network administrator is troubleshooting an EIGRP configuration across a discontiguous network. What must the administrator do to ensure the routers have the correct routing information?
A. Nothing, EIGRP supports discontiguous networks by default.
B. The administrator must disable automatic summarization with the command no auto-summary.
C. The administrator must enable manual summarization with the command ip summary-address.
D. The administrator must enable classless routing with the command ip classless.
E. The administrator must specify a default network with the command ip default-network.
Answer: B
QUESTION 17
What is the purpose of the eigrp stub configuration command?
A. to increase scalability by limiting the EIGRP query range
B. to reduce the size of the routing table by blocking the D EX (External EIGRP) routes into the EIGRP
stub router
C. to reduce the convergence time by enabling the EIGRP stub router to propagate the EIGRP queries
from the EIGRP hub router
D. to reduce the convergence time by enabling the EIGRP stub router to also perform query requests
to the EIGRP hub router
Answer: A
Explanation:
Complex, redundant EIGRP networks can cause scalability problems. The best solution to this is to provide a means within the context of the EIGRP protocol itself to control traffic flows and limit query depth. The EIGRP Stub Router functionality in Cisco IOS Software Release 12.0(7)T can achieve this solution.
The Enhanced Interior Gateway Routing Protocol (EIGRP) Stub Routing feature improves network stability, reduces resource utilization, and simplifies stub router configuration. Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke network, one or more end (stub) networks are connected to a remote router (the spoke) that is connected to one or more distribution routers (the hub). The remote router is adjacent only to one or more distribution routers. The only route for IP traffic to follow into the remote router is through a distribution router. This type of configuration is commonly used in WAN topologies where the distribution router is directly connected to a WAN. The distribution router can be connected to many more remote routers. Often, the distribution router will be connected to 100 or more remote routers. In a hub and spoke topology, the remote router must forward all non local traffic to a distribution router, so it becomes unnecessary for the remote router to hold a complete routing table. Generally, the distribution router need not send anything more than a default route to the remote router.
When using the EIGRP Stub Routing feature, you need to configure the distribution and remote routers to use EIGRP, and to configure only the remote router as a stub. Only specified routes are propagated from the remote (stub) router. The router responds to queries for summaries, connected routes, redistributed static routes, external routes, and internal routes with the message "inaccessible." A router that is configured as a stub will send a special peer information packet to all neighboring routers to report its status as a stub router. Any neighbor that receives a packet informing it of the stub status will not query the stub router for any routes, and a router that has a stub peer will not query that peer. The stub router will depend on the distribution router to send the proper updates to all peers.
QUESTION 18
Based on the information in the exhibit, which statement is true?
A. RTC will be able to access the 10.0.0.0 network.
B. RTC will not have the 10.0.0.0 network in its routing table.
C. RTC will not have the 192.168.10.0 network in its routing table.
D. RTB will not have the 10.0.0.0 network in its routing table.
E. RTB and RTC will not have the 10.0.0.0 network in their routing tables.
Answer: B
QUESTION 19
Which command displays statistics on EIGRP hello, updates, queries, replies, and acknowledgments?
A. debug eigrp packets
B. show ip eigrp traffic
C. show ip eigrp topology
D. show ip eigrp neighbors
Answer: B
QUESTION 20
A company has a BGP network and a BGP route of 196.27.125.0/24 that should be propagated to all of the devices. The route is not now in any of the routing tables. The administrator determines that an access list is the cause of the problem. The administrator changes the access list to allow this route, but the route still does not appear in any of the routing tables. What should be done to propagate this route?
A. Clear the BGP session.
B. Use the release BGP routing command.
C. Use the service-policy command to adjust the QOS policy to allow the route to propagate.
D. Change both the inbound and outbound policy related to this route.
Answer: A
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