300-510 Exam Dumps | Refer to the exhibit. The service provider environment has these configurations:

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Question 44

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Question 44/142

Refer to the exhibit. The service provider environment has these configurations:
- The OSPF backbone area is configured to advertise loopback prefixes.
- The PE routers run the BGP-IPv4 address family in a BGP-free core
topology.
- The broadband users IP subnet 192.168.10.0/24 is redistributed in BGP on PEA.
The operations team noticed route disruptions when broadband subscriber 192.168.10.8 goes offline. Which configuration must an engineer apply to PEA to resolve this problem?

A. PEA(config)# router bgp 65101
PEA(config-router)# network 192.168.10.0 255.255.255.255
PEA(Config)# Router ospf 10
PEA(Config-router)# redistribute bgp 65101

B. PEA(Config)# ip route 192.168.10.0 255.255.255.0 Null0
PEA(Config)# Router BGP 65101
PEA(Config-router)# redistribute static

C. PEA(Config)# ip route 192.168.10.0 255.255.255.0 Null0
PEA(Config)# Router ospf 10
PEA(Config-router)# redistribute static

D. PEA(config)# router ospf 10
PEA(config-router)# network 192.168.10.0 0.0.0.255 area 0
PEA(Config)# Router BGP 65101
PEA(Config-router)# redistribute ospf 10

Correct Answer: B

The broadband IP subnet 192.168.10.0/24 is redistributed into BGP. When 192.168.10.8 (a specific host) goes offline, this likely causes the route for 192.168.10.0/24 to flap or be withdrawn from BGP because the redistributed route depends on the presence of live hosts. This can cause disruptions for other hosts within the same subnet.
To stabilize the route advertisement in BGP, a static route to Null0 is configured for the entire subnet 192.168.10.0/24. The static route ensures that the prefix remains in the routing table regardless of host reachability. Redistributing the static route into BGP ensures that the prefix remains consistently advertised.
The ip route 192.168.10.0 255.255.255.0 Null0 creates a "dummy" static route that keeps the prefix in the routing table. The redistribute static command in BGP ensures the static route is advertised.

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