If router R1 knows a static route to a destination network and then learns about the same destination network through a dynamic routing protocol, how does R1 respond?
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A. B. C. D.B
When a router has multiple routes to the same destination network, it must decide which route to use. The selection process is based on the administrative distance of the routing protocol and the metric of the route.
In this case, router R1 has learned about a destination network through both a static route and a dynamic routing protocol. Here are the possible outcomes:
A. It refuses to advertise the dynamic route to other neighbors. If R1 has a static route to the destination network with a lower administrative distance than the dynamic routing protocol, it will prefer the static route and will not advertise the dynamic route to other neighbors. This is because the static route has a higher priority than the dynamic route. So, this option could be correct if the static route has a lower administrative distance than the dynamic routing protocol.
B. It prefers the static route. If R1 has a static route to the destination network with a lower administrative distance and a better metric than the dynamic routing protocol, it will prefer the static route and use it to forward traffic to the destination network. This is because the static route is more reliable and efficient than the dynamic route. So, this option could be correct if the static route has a lower administrative distance and a better metric than the dynamic routing protocol.
C. It disables the routing protocol. This is unlikely to happen because a router would not disable a routing protocol just because it learned about a destination network through a static route.
D. It sends a withdrawal notification to the neighboring router. This option is incorrect because the router does not send a withdrawal notification just because it learned about a destination network through a static route.
In summary, the answer depends on the administrative distance and metric of the static route and the dynamic routing protocol. If the static route has a lower administrative distance and a better metric than the dynamic routing protocol, the router will prefer the static route. If the dynamic routing protocol has a lower administrative distance or a better metric than the static route, the router will use the dynamic route. If the static route has a lower administrative distance than the dynamic routing protocol, the router will prefer the static route and not advertise the dynamic route to other neighbors.