JN0-363 · Question #17
Referring to the exhibit. You are advertising a summary route that represents your local network (172.20.0.0716) to both ISP A and ISPB. You want to influence all traffic sent to you from ISP C to…
The correct answer is C. On R2. prepend your AS number three times on the 172.20.0.0/16 route when advertising it to. To influence ISP C to prefer the path through R2 for the 172.20.0.0/16 network, R2 should make its path less preferable to ISP B by prepending its AS number multiple times. This makes the path through R2 appear longer and less desirable to ISP C, which would receive these…
Question
Referring to the exhibit. You are advertising a summary route that represents your local network (172.20.0.0716) to both ISP A and ISPB. You want to influence all traffic sent to you from ISP C to go through R2. How would you accomplish this task?
Exhibit
Options
- AOn R1, prepend your AS number three times on the 172.20.0.0/16 route when advertising It to
- BOn R1, change the local preference value to 250.
- COn R2. prepend your AS number three times on the 172.20.0.0/16 route when advertising it to
- DOn R2, change the local preference value to 50.
How the community answered
(26 responses)- A4% (1)
- B4% (1)
- C81% (21)
- D12% (3)
Explanation
To influence ISP C to prefer the path through R2 for the 172.20.0.0/16 network, R2 should make its path less preferable to ISP B by prepending its AS number multiple times. This makes the path through R2 appear longer and less desirable to ISP C, which would receive these updates from ISP B. AS path length is a well-known attribute in BGP and is used to determine the best path; paths with a longer AS path are considered less preferable.
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