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300-515 · Question #86

Refer to the exhibit. An engineer has configured router 1 to provide shared services to clients behind router 2. To complete the implementation so that routes from router 1 are accepted, what must…

The correct answer is B. with import route targets 201:202 and 401:402. Option B is correct because Router 2 needs to import the route targets that Router 1 exports for shared services - import RTs on Router 2 must match Router 1's export RTs (201:202 and 401:402) for the routes to be accepted into Router 2's VRF. Why the distractors fail: A is…

Layer 3 VPNs

Question

Refer to the exhibit. An engineer has configured router 1 to provide shared services to clients behind router 2. To complete the implementation so that routes from router 1 are accepted, what must the engineer configure on router 2?

Options

  • Awith import route targets 101:102 and 202:201
  • Bwith import route targets 201:202 and 401:402
  • Cwith export route targets 301:202 and 101:102
  • Dwith export route targets 201:202 and 401:402

How the community answered

(26 responses)
  • A
    4% (1)
  • B
    81% (21)
  • C
    12% (3)
  • D
    4% (1)

Explanation

Option B is correct because Router 2 needs to import the route targets that Router 1 exports for shared services - import RTs on Router 2 must match Router 1's export RTs (201:202 and 401:402) for the routes to be accepted into Router 2's VRF.

Why the distractors fail:

  • A is wrong because 101:102 and 202:201 are not the RT values Router 1 exports - these are likely Router 2's own export RTs or other VRF values shown in the exhibit, so no match occurs.
  • C is wrong on two levels: it uses export instead of import (wrong direction), and the RT values (301:202 and 101:102) don't match Router 1's shared-service exports.
  • D uses the correct RT values (201:202 and 401:402) but configures them as export rather than import - export RTs tag routes leaving a VRF, they don't control which routes are accepted into it.

Memory tip: Think of it as a lock-and-key: one router's export RT is the key, and the receiving router's import RT is the lock - they must match. "To receive, you import."

Topics

#route targets#import/export filtering#L3VPN routing#BGP VPN

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