Which two options correctly describe Remote Triggered Black Hole Filtering (RFC 5635)? (Choose
two.)
A.
RTBH destination based filtering can drop traffic destined to a host based on triggered entries
in the FIB.
B.
RTBH source based filtering will drop traffic from a source destined to a host based on
triggered entries in the RIB
C.
Loose uRPF must be used in conjunction with RTBH destination based filtering
D.
Strict uRPF must be used in conjunction with RTBH source based filtering
E.
RTBH uses a discard route on the edge devices of the network and a route server to send
triggered route updates
F.
When setting the BGP community attribute in a route-map for RTBH use the no-export
community unless BGP confederations are used then use local-as to advertise to sub-as
confederations
Explanation:
“When RTBH filtering is desired for a specific address, that
address is announced from a trigger router (or route server),
tagged with the chosen “RTBH” community and with the NO_EXPORT
community, and passed via iBGP. The receiving routers check the
BGP policy, set the next-hop to be the discard route, resulting in
a Forwarding Information Base (FIB) entry pointing to a discard
address.”
– https://tools.ietf.org/html/rfc5635
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