Free 642-883 Sample Question 24

Which reserved AS number or range of numbers is used for backward compatibility between old BGP peers using 16-bit AS number and new BGP peers using 32-bit AS number?

Options

A. AS 65001 to 65535

B. AS 65512 to 65535

C. AS 12345

D. AS 23456

E. AS 64001

Correct Answer: D
Explanation/Reference:

https://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6554/ps6599/4byte_asnios.pdf
New Reserved AS#
AS_TRANS = AS #23456
2-byte placeholder for a 4-byte AS number
Used for backward compatibility between OLD and NEW BGP speakers

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