Route introduction refers to the operation of publishing routing information from one routing protocol to another routing protocol. Which of the following statements about routing introduction is…

Question

Options

• AWhen implementing route import, you can also deploy route air control, so as to realize the flexible control of correct business traffic
• BIn importing routes, routing information can be transferred between different routing protocols
• CThere are routing loops and route loss problems in the network, so we need to avoid this problem when the routes enter each other.
• DWhen importing routes, it is necessary to pay attention to the fact that different vendors may have different routing priority agreements

• A
  73% (27)
• B
  3% (1)
• C
  16% (6)
• D
  8% (3)

Explanation

Option A is the wrong statement because route redistribution combined with routing policy (what "route air control" refers to) controls which routing information gets redistributed between protocols - it does not directly achieve "flexible control of business traffic." Traffic control requires separate mechanisms such as QoS or traffic policies; conflating routing information management with traffic management is the core error in A.

B is correct: Route redistribution's fundamental purpose is exactly this - moving routing information between different protocols (e.g., OSPF into BGP).

C is correct: Mutual redistribution genuinely introduces the risk of routing loops and route loss (e.g., a route learned via OSPF gets imported into BGP and then re-imported back into OSPF with a different metric), so avoiding this is a real and necessary concern.

D is correct: Administrative distance (routing priority) values are not standardized across vendors - Cisco, Huawei, and others assign different default values, so route preference conflicts are a real consideration during redistribution.

Memory tip: Remember that redistribution operates on the control plane (routing table), not the data plane (actual traffic flows) - any answer claiming redistribution directly controls traffic behavior should be flagged as suspect.

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