| Exam 642-883 | Question id=3445 | BGP Routing in Service Provider Environments |
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 |
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