An Enterprise router, Ent1, displays the following excerpt from the show ip bgp command.
ENT1 has an eBGP connection to an ISP router with address 3.3.3.3 and an
iBGP connection to a router with address 4.4.4.4. Which of the following is most likely to be
true?
Network Next Hop Metric LocPrf Weight Path
*> 3.3.3.3 0 0 1 1 1 1 2
18 i
A.
The Enterprise likely uses ASN 1.
B.
The neighboring ISP likely uses ASN 1.
C.
The route has been advertised through ASN 1 multiple times.
D.
Router Ent1 will add another ASN to the AS_Path before advertising this route to its iBGP
peer (4.4.4.4).
Explanation:
The output shows the results of AS_Path prependinG. The repetitive 1’s cannot
mean that the route has been advertised into and out of the same ASN repeatedly because
loop prevention would have prevented such an advertisement. With AS_Path
prepending, the neighboring ASN typically adds its own ASN to the end of the
AS_Path (as listed on the left of the output).