In which solution is a router ACL used?

Question

Options

• Afiltering packets that are passing through a router
• Bto change the default administrative distance of a route in the route table
• Cprotecting a server from unauthorized access
• Dcontrolling path selection, based on the route metric

• A
  93% (50)
• B
  2% (1)
• C
  4% (2)
• D
  2% (1)

Explanation

The primary and defining purpose of a router ACL is to filter packets as they pass through the router - permitting or denying traffic based on criteria such as IP address, protocol, and port number. ACLs are applied to router interfaces either inbound or outbound to control which packets are forwarded. Option B is incorrect; administrative distance is modified using the 'distance' command in routing configuration. Option C is partially achievable with ACLs but describes firewall or host-based security more accurately - ACLs on routers are not typically described as 'protecting a server.' Option D describes routing protocol metric manipulation, which is handled by route maps or protocol-specific commands, not ACLs.

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