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Question 234 - 300-410 discussion

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R1 and R2 are configured as eBGP neighbor , R1 is in AS100 and R2 is in AS200. R2 is advertising these networks to R1:

172.16.16.0/20

172.16.3.0/24

172.16.4.0/24

192.168.1.0/24

192.168.2.0/24

172.16.0.0/16

The network administrator on R1 must improve convergence by blocking all subnets of 172-16.0.0/16 major network with a mask lower than 23 from coming in, Which set of configurations accomplishes the task on R1?

A.

ip prefix-list PL-1 deny 172.16.0.0/16 le 23

ip prefix-list PL-1 permit 0.0.0.0/0 le 32

!

router bgp 100

neighbor 192.168.100.2 remote-as 200

neighbor 192.168.100.2 prefix-list PL-1 in

Answers
A.

ip prefix-list PL-1 deny 172.16.0.0/16 le 23

ip prefix-list PL-1 permit 0.0.0.0/0 le 32

!

router bgp 100

neighbor 192.168.100.2 remote-as 200

neighbor 192.168.100.2 prefix-list PL-1 in

B.

ip prefix-list PL-1 deny 172.16.0.0/16 ge 23

ip prefix-list PL-1 permit 0.0.0.0/0 le 32

!

router bgp 100

neighbor 192.168.100.2 remote-as 200

neighbor 192.168.100.2 prefix-list PL-1 in

Answers
B.

ip prefix-list PL-1 deny 172.16.0.0/16 ge 23

ip prefix-list PL-1 permit 0.0.0.0/0 le 32

!

router bgp 100

neighbor 192.168.100.2 remote-as 200

neighbor 192.168.100.2 prefix-list PL-1 in

C.

access-list 1 deny 172.16.0.0 0.0.254.255

access-list 1 permit any

!

router bgp 100

neighbor 192.168.100.2 remote-as 200

neighbor 192.168.100.2 distribute-list 1 in

Answers
C.

access-list 1 deny 172.16.0.0 0.0.254.255

access-list 1 permit any

!

router bgp 100

neighbor 192.168.100.2 remote-as 200

neighbor 192.168.100.2 distribute-list 1 in

D.

ip prefix-list PL-1 deny 172.16.0.0/16

ip prefix-list PL-1 permit 0.0.0.0/0

!

router bgp 100

neighbor 192.168.100.2 remote-as 200

neighbor 192.168.100.2 prefix-list PL-1 in

Answers
D.

ip prefix-list PL-1 deny 172.16.0.0/16

ip prefix-list PL-1 permit 0.0.0.0/0

!

router bgp 100

neighbor 192.168.100.2 remote-as 200

neighbor 192.168.100.2 prefix-list PL-1 in

Suggested answer: A
asked 07/10/2024
Fabrizio Leo
38 questions
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