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  部分642-902题库分享如下：

1.Refer to the exhibit. Which three statements are true? (Choose three.)

S 62.99.153.0/24 [1/0] via 209.177.64.130 172.209.12.0/32 is subnetted, 1 subnets

D EX 172.209.1

[170/2590720] via 209.179.2.114, 06:47:28, Serial0/0/0.1239

62.113.17.0/24 is variably subnetted, 2 subnets, 2 masks

D EX 99.3.215.0/24

[170/27316] via 209.180.96.45, 09:52:10, FastEthernet11/0/0

[170/27316] via 209.180.96.44, 09:52:10, FastEthernet11/0/0

25.248.17.0/24

[90/1512111] via 209.179.66.25, 10:33:13, Serial0/0/0.1400001

[90/1512111] via 209.179.66.41, 10:33:13, Serial0/0/0.1402001

62.113.1.0/24 is variably subnetted, 12 subnets, 2 masks

D 62.113.1.227/32

 [90/2611727] via 209.180.96.45, 10:33:13, FastEthernet1/0/0

[90/2611727] via 209.180.96.44, 10:33:13, FastEthernet1/0/0

S* 0.0.0.0/0 [1/0] via 209.180.96.14

A. On the routing table of R4, the 10.1.1.0/24 route appears as an O E2 route.

B. On R4, the 172.16.1.0/24 route has a metric of 20.

C. The R3 S0/0 interface should not need the no ip split-horizon eigrp 1 configuration command for the 172.16.1.0/24 route to appear in the routing table of R2 as an D EX route.

D. The administrative distance of the 172.16.1.0/24 route in the routing table of R3 is 170.

E. On R5, the 4.0.0.0/8 route will have an administrative distance of 120 and a hop count of 6.

Answer: A,B,D

2.Which command will display EIGRP packets sent and received, as well as statistics on hello packets, updates, queries, replies, and acknowledgments?

A. debug eigrp packets

B. show ip eigrp traffic

C. debug ip eigrp

D. show ip eigrp interfaces

Answer: B

3.Which three statements are true about EIGRP operation? (Choose three.) Select 3 response(s).

A. When summarization is configured, the router will also create a route to null 0.

B. The summary route remains in the route table, even if there are no more specific routes to the network.

C. Summarization is configured on a per-interface level.

D. The maximum metric for the specific routes is used as the metric for the summary route.

E. Automatic summarization across major network boundaries is enabled by default.

Answer: A,C,E

4.Which two statements about the EIGRP DUAL process are correct? (Choose two.) Select 2 response(s).

A. An EIGRP route will go active if there are no successors or feasible successors in the EIGRP topology table.

B. An EIGRP route will go passive if there are no successors in the EIGRP topology table.

C. DUAL will trigger an EIGRP query process while placing the flapping routes in the holddown state.

D. A feasible successor in the EIGRP topology table can become the successor only after all the query requests have been replied to.

E. The stuck in active state is caused when the wait for the query replies have timed out.

F. EIGRP queries are sent during the loading state in the EIGRP neighbor establishment process.

Answer: A,E

5.What are three key concepts that apply when configuring the EIGRP stub routing feature in a hub and spoke network? (Choose three.) Select 3 response(s).

A. A hub router prevents routes from being advertised to the remote router.

B. Only remote routers are configured as stubs.

C. Stub routers are not queried for routes.

D. Spoke routers connected to hub routers answer the route queries for the stub router.

E. A stub router should have only EIGRP hub routers as neighbors.

F. EIGRP stub routing should be used on hub routers only.

Answer: B,C,E

6.Based on the exhibited output, which three statements are true? (Choose three.)

A. All the routes are in the passive mode because R1 is in the query process for those routes.

B. R1 is in AS 200.

C. R1 will load balance between three paths to reach the 192.168.1.48/28 prefix because all three paths have the same advertised distance (AD) of 40512000.

D. 40512000 is the advertised distance (AD) via 192.168.1.66 to reach the 192.168.1.48/28 prefix.

E. All the routes are in the passive mode because these routes are in the hold-down state.

F. The best path for R1 to reach the 192.168.1.48/28 prefix is via 192.168.1.66.

Answer: B,D,F

7.Refer to the exhibit. EIGRP is configured with the default configuration on all routers. Auto summarization is enabled on routers R2 and R3, but it is disabled on router R1. Which two EIGRP routes will be seen in the routing table of router R3? (Choose two.)

A. 10.0.0.0/8

B. 172.16.10.0/24

C. 172.16.0.0/24

D. 10.10.10.0/24

E. 172.16.0.0/16

F. 10.10.0.0/16

Answer: D,E

8.Refer to the exhibit. EIGRP has been configured on routers R1 and R2. However, R1 does not show R2 as a neighbor and does not accept routing updates from R2. What could be the cause of the problem?

A. The no auto-summary command has not been issued under the EIGRP process on both routers.

B. Interface E0 on router R1 has not been configured with a secondary IP address of 10.1.2.1/24.

C. EIGRP cannot exchange routing updates with a neighbor's router interface that is configured with two IP addresses.

D. EIGRP cannot form neighbor relationship and exchange routing updates with a secondary address.

Answer: D

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