Which of the following tools can be used with multiple routing protocols and consists of an if-match and apply clause?

Question

Options

• Acommunity-filter
• Broute-filter
• Croute-policy
• Dip-prefix

• A
  7% (3)
• B
  2% (1)
• C
  76% (32)
• D
  14% (6)

Explanation

Route-policy (C) is correct because it is a multi-protocol policy tool - applicable to BGP, OSPF, IS-IS, RIP, and others - and is structurally defined by if-match clauses (which specify matching conditions such as prefix, AS-path, or community) and apply clauses (which modify route attributes like MED, local preference, or next-hop).

Why the distractors are wrong:

• A. community-filter - Matches only BGP community attributes; it's a single-protocol matching tool with no apply clause of its own.
• B. route-filter - A simpler, more limited filtering mechanism; it lacks the dual if-match/apply clause structure and is not as universally multi-protocol.
• D. ip-prefix - Matches IP address prefixes only; it has no apply clause and serves purely as a matching reference used by policies, not a policy itself.

Memory tip: Think of route-policy as a full "if → then" rule engine: if-match = the condition, apply = the action. The word "policy" implies decision-making power across protocols - filters and prefixes are just inputs that a policy consults.

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