OSPF question

Agis

Hey all,
I was doing an OSPF lab and I used these commands after enabling OSPF on RouterA:
#router ospf 100
#network 172.19.0.161 255.255.255.224 area 0

Now this "lab" is a Testout sim. It accepted the command and when I used the "show ip route" command the network address showed up on RouterB correctly. The sim said I correctly configured the routers. When reviewing I saw that I should have used-
#network 172.19.0.0 0.0.0.31 area 0

...using the wildcard mask. Question- Can you do it both ways? ...or is the sim incorrect and real routers would be configured incorrectly? :

Thanks
*edit- I accidentally used 127 instead of 31 in my original post*

BennyLava

A real router accepts either but a subnet mask will be automatically converted to a wildcard mask in the config


R2(config-router)#net 172.19.0.161 255.255.255.224 area 0
R2(config-router)#do sh run | section router
router ospf 1
log-adjacency-changes
network 172.19.0.160 0.0.0.31 area 0


For exam purposes, you would probably want to enter it with a wildcard mask in case the sim doesn't behave the same way.