Question 1
A network consultant is troubleshooting IS-IS instances to identify why a routing domains is having communication problems between the two instances. Which description of the possible cause of issues in the routing domain is true?
The same interface cannot be advertised in two different IS-IS instances
The IS-IS "ISP" and "ISP2" instances are unrelated and unable to intercommunicate
The configured IS-IS NSEL value is not allowing the routing systems to establish a neighborship
The interface mode ip router is-is command was not included in the script
Correct answer: A
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/xe-3s/irsxe-3s-book/irs-instance-vrf.html
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/xe-3s/irsxe-3s-book/irs-instance-vrf.html