When the passive-interface command is used on a router, which two routing protocols will
continue to receive routing updates on an interface that is configured as passive? (Choose two.)
A.
OSPF
B.
RIP
C.
RIPv2
D.
EIGRP
Explanation:
You can use the passive-interface command to control the advertisement of routing information.
The command enables the suppression of routing updates over some interfaces while it allows
updates to be exchanged normally over other interfaces.
With most routing protocols, such as RIP version 1 and 2, the passive-interfacecommand
restricts outgoing advertisements only. However, when used with Enhanced Interior Gateway
Routing Protocol (EIGRP) and OSPF, the effect is slightly different. The use of the passiveinterfacecommand in EIGRP suppresses the exchange of hello packets between two routers,
which results in the loss of their neighbor relationship. This stops not only routing updates from
being advertised, but it also suppresses incoming routing updates.
The same is true for OSPF. To stop routers from becoming OSPF neighbors on a particular
interface, issue the passive-interfacecommand at the interface.
References:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0a.shtml
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml