Question 29 of 92 from exam 300-410-ENARSI: Implementing Cisco Enterprise Advanced Routing and Services

Question 29 of 92 from exam 300-410-ENARSI: Implementing Cisco Enterprise Advanced Routing and Services

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Question

AS 1000 Internet Cloud 192.168.101.0/24 192.168.102.0/24 192.168.100.0/24 192.168.200.0/24 Customer Edge

Refer to the exhibit.

The network administrator has configured the Customer Edge router (AS 64511) to send only summarized routes toward ISP-1 (AS 100) and ISP-2 (AS 200).

router bgp 64511 network 172.16.20.0 mask 255.255.255.0 network 172.16.21.0 mask 255.255.255.0 network 172.16.22.0 mask 255.255.255.0 network 172.16.23.0 mask 255.255.255.0 aggregate-address 172.16.20.0 255.255.252.0

After this configuration, ISP-1 and ISP-2 continue to receive the specific routes and the summary route.

Which configuration resolves the issue? A.

router bgp 64511 aggregate-address 172.16.20.0 255.255.252.0 summary-only

B.

router bgp 64511 neighbor 192.168.100.1 summary-only neighbor 192.168.200.2 summary-only

C.

list PL_BLOCK_SPECIFIC deny 172.16.20.0/22 ge 22 ip prefix-list PL_BLOCK_SPECIFIC permit 172.16.20.0/22 ! route-map BLOCK_SPECIFIC permit 10 match ip address prefix-list PL_BLOCK_SPECIFIC ! router bgp 64511 aggregate-address 172.16.20.0 255.255.252.0 suppress-map BLOCK_SPECIFIC

D.

interface E 0/0 ip bgp suppress-map BLOCK_SPECIFIC ! interface E 0/1 ip bgp suppress-map BLOCK_SPECIFIC ! ip prefix-list PL_BLOCK_SPECIFIC permit 172.16.20.0/22 ge 24 ! route-map BLOCK_SPECIFIC permit 10 match ip address prefix-list PL BLOCK_SPECIFIC

Explanations

A.

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