642-883 Exam Dumps | Which reserved AS number or range of numbers is used for backward compatibility between old BGP peers

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Cisco.642-883.v2018-06-25.q81
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Question 4/81

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?

A. AS 65001 to 65535

B. AS 65512 to 65535

C. AS 12345

D. AS 23456

E. AS 64001

Correct Answer: D

Explanation/Reference:
http://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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