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?

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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

Answer: D

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