What is the multicast address that an OSPF device uses to communicate with the designated router?
Highlight for answer: 126.96.36.199
TIP: If you are allowed access to a command prompt during the open-ended questions and you want to verify your answer (or you know that the answer is 224.0.0.x but you forget what the last octet is)then you can always do an ‘nslookup 224.0.0.x’ and plug in values for the last octet.
Highlight below for some examples (from Linux but Windows will return the same/similar results):
188.8.131.52.in-addr.arpa name = ALL-SYSTEMS.MCAST.NET.
184.108.40.206.in-addr.arpa name = ALL-ROUTERS.MCAST.NET.
220.127.116.11.in-addr.arpa name = OSPF-ALL.MCAST.NET.
18.104.22.168.in-addr.arpa name = OSPF-DSIG.MCAST.NET.
22.214.171.124.in-addr.arpa name = RIP2-ROUTERS.MCAST.NET.
10.0.0.224.in-addr.arpa name = IGRP-ROUTERS.MCAST.NET.