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Routing protocols and passive int

I am having trouble with the following question, there are 3 right ones:

A. After the router RIP and passive int S0/0 cmd has been issued, the S0/0 int will not send any RIP updates, bur will receive updates on that interface.
B. After the router OSPF and passive int S0/0 cmd has been issued, the S0/0 int will not send any OSPF updates, bur will receive updates on that interface.
C. After the router EIGRRP and passive int S0/0 cmd has been issued, the S0/0 int will not send any EIGRP updates, but will receive updates on that interface.
D. When you use the passive int cmd with EIGRP, hello msg are not sent out on specified int.
E. When you use the passive int cmd with OSPF, hello msg are not sent out on specified int.
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totaram
Asked:
totaram
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1 Solution
 
Marius GunnerudSenior Systems EngineerCommented:
Not sure what your question is.

When the passive interface command is used the routing protocol is in non-broadcast mode..ie unicast mode.  So it will receive updates but will not send out updates unless the neighbor command is issued, and then it will only send updates to the neighbors that are specified.
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totaramAuthor Commented:
The question is which three of the five is correct? As per your posting, all five seem correct, but the right answer is ADE.
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Marius GunnerudSenior Systems EngineerCommented:
It is a trick question, ospf and eigrp send update information with the hello packets.
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totaramAuthor Commented:
I see what you are saying, I was thinking more on protocol side.. EIGRP does not receive and send any uodates when passive interface cmd is issued, unlike rest of other protocols.
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Marius GunnerudSenior Systems EngineerCommented:
EIGRP, when it no longer has a neighbor, will ignore all incoming update as well as not send any outbound updates. basically when updates are comming in EIGRP says, I don't know who you are so i will ignore you.
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