What does the passive-interface command do when implement with RIP? (Choose two.)
- Allows an interface to receive routing update traffic
- Prevents an interface from sending routing update traffic
- Prevents an interface from sending any normal data traffic
- Allows an interface to receive normal data traffic
- Disables a router interface
- Places a router interface in standby mode
The effect of the passive-interface command is dependent on the routing protocol running on the interface. For EIGRP, the router will not only stop sending routing updates, but also hellos, which means that it will not form a neighbor relationship with another EIGRP router on that interface. This is also the case with OSPF and IS-IS. With RIP, however, the router will continue to send hellos even as it stops sending routing updates, and it will still receive routing updates. An example of using the passive-interface command is below. The command is issued from the router configuration mode.
Router(config-router)# passive-interface ethernet 0/0
The passive-interface command will even overrule a configuration that includes a distribute list that allows the advertisement of a network through the interface. Examine the partial output of the show run command taken from a router running EIGRP below:
router eigrp 100
network 10.16.18.0 0.0.255.255
network 10.16.19.0 0.0.255.255
passive-interface serial 0/0
distribute-list 50 out serial 0/0
Access-list 50 permit 10.16.8.0 0.0.255.255
In this case, although the distribute list allows the advertisement of the 10.16.8.0 network, the passive-interface command applied to the Serial 0/0 interface will disallow all outgoing and incoming updates.
The passive-interface command does not affect the transmission or reception of normal data traffic, only routing updates.
The passive-interface command does not disable the router interface. The shutdown command is used to disable a router interface.
The passive-interface command does not place the router in standby mode.
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