Refer to the exhibit. While provisioning a new BGP session between the PE and CE router, you issue the as-override command. Which statement describes modification of the prefix before being sent to the CE router (10.10.10.1)?
A.
The fourth AS changes, but no other autonomous systems change.
B.
The first and fourth autonomous systems change.
C.
The second and third autonomous systems change.
D.
The first AS changes, but no other autonomous systems change.
It's B mesmo.
SPCOR E-learning Cisco, section 14.7, we have:
The modified AS-path update procedure is called AS override:
• The procedure is used only if the first AS number in the AS path is equal to the AS number of the receiving BGP router.
• In this case, all leading occurrences of the AS number of the receiving BGP router are replaced with the AS number of the sending BGP router. Occurrences that are farther down the AS path of the AS number of the receiving router are not replaced because they indicate a real routing information loop.
• An extra copy of the sending router AS number is prepended to the AS path. The standard AS number prepending procedure occurs on every EBGP update.
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