300-410 Questions Bank

The ―summary-address‖ is only used to create aggregate addresses for OSPF at an autonomous system boundary. It means this command should only be used on the ASBR when you are trying to summarize externally redistributed routes from another protocol domain or you have a NSSA area. But a requirement to create a summarized route is:

―The ASBR compares the summary route’s range of addresses with all routes redistributed into OSPF on that ASBR to find any subordinate subnets (subnets that sit inside the summary route range). If at least one subordinate subnet exists, the ASBR advertises the summary route.‖

vty 0:

+ cisco

+ 0csic

vty 1:

+ no username

+ no password

The command “aaa authentication login default none” means no authentication is required when

access to the device via Console/VTY/AUX so if one interface does not specify another login

authentication method (via the “login authentication …” command), it will allow to access

without requiring username or password. In this case VTY 1 does not specify another

authentication login method so it will use the default method (which is “none” in this case).