| Exam 640-878 | Question id=4925 | Routed Network Technologies II |
Which BGP attribute is also used for loop prevention?
| A. |
weight | |
| B. |
local preference | |
| C. |
MED | |
| D. |
AS path |
As RFC 4271 says, “AS loop detection is done by scanning the full AS path (as specified in the AS_PATH attribute), and checking that the autonomous system number of the local system does not appear in the AS path”.