Cisco BGP Configuring BGP on Cisco Routers Set 3

1.

When the border routers in a transit autonomous system are to be configured, which configuration command should be used if the internal routers within the transit autonomous system have no IGP route to reach the router interface of the EBGP neighbor?

neighbor {ip-address} ebgp-multihop {hop-count} neighbor {ip-address} ibgp-multihop {hop-count} neighbor {ip-address} update-source {interface} neighbor {ip-address} next-hop-self sync

2.

Which of the following statements about the BGP MED path attribute on Cisco routers is correct?

If the MED is not attached to a BGP route, it defaults to 0 (best). By default, MED can be considered for routers coming from different autonomous systems. By default, MED can be considered for routers coming from different intrafederation autonomous systems. The bgp deterministic-med command is used to ensure that an accurate MED comparison is made acrossall routes received from different autonomous systems. The bgp deterministic-med command is used to allow the MED to determine the BGP path selection overthe other BGP attributes.

3.

Which of the following errors is the most common when configuring BGP routers within a transit AS?

using BGP next-hop-self on the edge routers BGP to IGP redistribution errors IGP to BGP redistribution errors BGP synchronization enabled eBGP and iBGP administrative distance configuration errors

4.

Which prefix-list will permit the 172.16.1.32 255.255.255.240 prefix?

ip prefix-list Certkiller permit 172.16.1.0/28 ip prefix-list Certkiller permit 172.0.0.0/8 le 30 ip prefix-list Certkiller permit 172.16.0.0/16 eq 28 ip prefix-list Certkiller permit 172.16.1.0/8 ge 29

5.

Which statement is correct about transit AS and iBGP?

The iBGP full mesh is a physical full mesh of all the routers within a transit AS. The iBGP full mesh is a logical mesh of TCP sessions. Transit AS running full-mesh iBGP requires synchronization to be enabled. Transit AS running full-mesh iBGP requires next-hop-self to be enabled on all the core routers. iBGP neighbors within a transit AS must be directly connected to each other.

6.

Which method could be used to improve the scalability of IS-IS used as the IBGP of an ISP?

Use stub or totally stubby nonbackbone IS-IS areas. Use IS-IS route leaking into the nonbackbone IS-IS areas. Use IS-IS CSNP on Level-1-2 circuits. Use IS-IS pseudo-node on Level-1-2 circuits. Use proper interarea route summarization.

7.

Which of the following statements about the BGP MED path attribute on Cisco routers is correct?

If the MED is not attached to a BGP route, it defaults to 0 (best). By default, MED can be considered for routes coming from different autonomous systems. By default, MED can be considered for routes coming from different intraconfederation autonomoussystems. The bgp deterministic-med command is used to ensure that an accurate MED comparison is made acrossall routes received from different autonomous systems. The bgp deterministic-med command is used to allow the MED to determine the BGP path selection overthe other BGP attributes.

8.

Which command is used to configure the external, confederation-wide AS number?

Certkiller 3(config)#router bgp {as-number} Certkiller 3(config-router)#bgp confederation peers {as-number} Certkiller 3(config-router)#bgp confederation identifier{as-number} Certkiller 3(config-router)#bgp cluster-id{as-number} Certkiller 3(config-router)#neighbor {ip address} remote-as {as-number}

9.

Which BGP path attribute is used to inform the BGP peer that the routing information that was presented in the original routing updates may have been lost when the updates were summarized?

AGGREGATOR AS_PATH ATOMIC_AGGREGATE CLUSTER_LIST COMMUNITY

10.

You work as a network engineer at Certkiller .com. You are troubleshooting a BGP neighbor relationship in
which the neighbor relationship has gone down. You issue the following command:
show ip bgp summary
You see the string "PfxCt" and Idle appear in the State/PfxRcd field.
What could be the cause of this issue?

The neighbor has been manually shutdown. The maximum prefix limit had been set and exceeded. The interface on the neighbor router is down. There is a problem with the service provider. The neighbor has no prefix to send.

Cisco BGP Configuring BGP on Cisco Routers Set 3

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Cisco BGP Configuring BGP on Cisco Routers Set 3

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