CCNA test tomorrow in the morning, have 1 question

miller811

I am confused on entering the address for routing under the following scenarios
for instance EIGRP for a network 10.1.1.0 255.255.255.0
when do you need to enter it as just the network and not a wildcard mask

The same for OSPF
how do you know when to add it as 10.0.0.0 or 10.1.1.0

similar for IGRP
10.0.0.0 or 10.1.1.0

RIP, same deal...

any suggestions.

I have been at it for 30 days straight, at least 6 hours a day.

On the sims I am using (Cisco Press) sometimes it shows 10.0.0.0.

Just trying to determine the right answer before the test in the morning.
I don't want to give away any points on the exam.

Thanks.

r_durant

For EIGRP, you would enter the network at the classful boundary, example...network 10.0.0.0, but i think you can use either the netmask or wildcards, but i think it depends on the IOS version...don't quote me on that, I'd have to get verification...for the CCNA i'd just go with network 10.0.0.0


For OSPF, you can use either method, but the wildcards must be used, example...network 10.0.0.0 0.0.0.255 area 0 or network 10.1.1.0 0.0.0.255 area 0

With OSPF, there's no real rule of thumb to enter the networks, but if you have 2 or more interfaces that are subnetted or in the same classful boundary, then you have choices...

Let's say one interface was 10.1.1.1/30 and another was 10.1.1.5/30, but you only wanted to advertise the 10.1.1.5 interface, then you can enter them as...

network 10.1.1.5 0.0.0.0 area 0 or (which specifies just that one interface)
network 10.1.1.4 0.0.0.3 area 0 (which specifies anything in the 10.1.1.4 subnet)

...since entering 10.1.1.0 0.0.0.255 would advertise both interfaces


RIP is similar to EIGRP, however I've never come across an instance where you specify the mask or wilcard, so it's just entered at the classful boundary...network 10.0.0.0

If you're using RIPv2, then the subnet mask is advertised...but nor with v1