R1 is currently advertising prefixes 1.0.0.0/8, 2.0.0.0/8, and 3.0.0.0/8 over its eBGP
connection to neighbor 2.2.2.2 (R2). An engineer configures a prefix list (fred) on R1 that
permits only 2.0.0.0/8 and then enables the filter with the neighbor R2 prefix-list fred out
command. Upon exiting configuration mode, the engineer uses some show commands on
R1, but no other commands. Which of the following is true in this case?

A.
The show ip bgp neighbor 2.2.2.2 received-routes command lists the three original
prefixes.

B.
The show ip bgp neighbor 2.2.2.2 advertised-routes command lists the three original
prefixes.

C.
The show ip bgp neighbor 2.2.2.2 routes command lists the three original prefixes.

D.
The show ip bgp neighbor 2.2.2.2 routes command lists only 2.0.0.0/8.

E.
The show ip bgp neighbor 2.2.2.2 advertised-routes command lists only 2.0.0.0/8.

Explanation:

The show ip bgp neighbors 2.2.2.2 advertised-routes command does list the postoutboundfilter BGP Update; however, the user did not issue a clear command, so the filter has not yet
taken effect. As such, the output still lists the original three prefixes as if the filter had not yet
been applieD.