Which of the following descriptions about route-policy is incorrect? (Multiple choice)

Question

Options

• AThe route control list can be used to match the address of routing information or data packets, and filter routing information or data packets that do not meet the conditions
• BThe prefix list can only be used to filter routing information, not data packets
• CThe community filter is a tool used to match the community attributes in BGP routing information. It can filter BGP routes independently according to the community attributes of BGP routes
• DThe path-filter is a tool used to match the attribute in BGP routing information. It can filter BGP routes independently according to the AS Path attribute of BGP routing

• A
  5% (1)
• B
  81% (17)
• C
  14% (3)

Explanation

Both B and D contain false statements. B incorrectly uses the absolute claim that prefix lists can only filter routing information and cannot filter data packets - prefix lists can also be applied in packet-filtering contexts, so the blanket exclusion is wrong. D incorrectly states that the AS path filter (path-filter) can filter BGP routes independently; in practice, path-filter is a matching condition that must be referenced inside a route-policy to actually take effect, meaning it has no standalone filtering capability. Options A and C are correct: ACLs (route control lists) genuinely filter both routing information and data packets, and community filters accurately match BGP community attributes and can be applied to BGP route filtering. Memory tip: On Huawei exam questions, flag absolute words like "only" (B) and "independently" (D) - they almost always signal an overstatement; prefix lists are broader than "routing only," and filtering tools like path-filter depend on a route-policy to do real work.

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