350-401 · Question #405
Which effect of configuring the passive-interface S0/0 command under the EIGRP routing process is true?
The correct answer is A. It prevents EIGRP neighbor relationships from being formed over interface S0/0.. Configuring passive-interface S0/0 under the EIGRP routing process prevents the interface from sending hello packets, thereby stopping EIGRP neighbor adjacencies from forming on S0/0.
Question
Which effect of configuring the passive-interface S0/0 command under the EIGRP routing process is true?
Options
- AIt prevents EIGRP neighbor relationships from being formed over interface S0/0.
- BIt configures interface S0/0 to send hello packets with the passive-interface bit set.
- CIt configures interface S0/0 to suppress all outgoing routing updates.
- DIt configures interface S0/0 to reject all incoming routing updates.
How the community answered
(57 responses)- A75% (43)
- B7% (4)
- C14% (8)
- D4% (2)
Why each option
Configuring `passive-interface S0/0` under the EIGRP routing process prevents the interface from sending hello packets, thereby stopping EIGRP neighbor adjacencies from forming on S0/0.
The `passive-interface` command, when applied to an interface for EIGRP, stops the transmission of EIGRP hello packets out of that interface, which is crucial for neighbor discovery and adjacency formation, thus preventing neighbors from forming.
EIGRP hello packets do not have a 'passive-interface bit'; the command simply prevents them from being sent.
While a passive interface does suppress outgoing routing updates, the primary mechanism causing this and preventing all routing protocol communication is the cessation of hello packets and neighbor formation.
A passive interface primarily affects outgoing EIGRP traffic and neighbor formation; it does not explicitly reject incoming routing updates but rather won't process them from non-neighbors on that segment.
Concept tested: EIGRP passive interface behavior
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-config-eigrp.html
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