Which of the following description of routing strategy and policy routing is correct? (Multiple choice)

Question

Options

• ARouting policies mainly control the forwarding of packets, that is, packets may be forwarded
• BPolicy routing mainly controls the introduction, publication and reception of routing information.
• CRouting policy mainly controls the introduction, publication and reception of routing information.
• DPolicy routing mainly controls the forwarding of packets, that is, packets can be forwarded without

• A
  21% (3)
• B
  7% (1)
• C
  71% (10)

Explanation

C and D are correct because they accurately capture the fundamental distinction between two easily confused concepts. Routing policy (options C) operates on the control plane - it governs how routing information is imported into, exported from, and redistributed between routing protocols, essentially shaping the routing table itself. Policy routing (option D) operates on the data plane - it intercepts individual packets during forwarding and routes them based on criteria beyond just the destination IP (e.g., source address, protocol, port), potentially overriding the normal routing table lookup.

A is wrong because it assigns packet-forwarding control to "routing policies" - that's the job of policy routing, not routing policy. B is wrong for the opposite reason: it assigns routing-information control to "policy routing" - that belongs to routing policy. A and B are simply the definitions swapped onto the wrong terms.

Memory tip: Think of the word order as a clue - "Routing Policy" modifies routing (the routing table/information), so it controls routing info. "Policy Routing" modifies routing (the act of forwarding), so it controls how packets are forwarded. Control plane vs. data plane - Policy first means packets first.

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