What is the recommended Cisco best practice for configuring an OSPF-enabled router so that each router can be easily identified when troubleshooting routing issues?
- Configure a value using the router-id command.
- Use the highest active interface IP address that is configured on the router.
- Use a loopback interface configured with the highest IP address on the router.
- Use the highest IP address assigned to an active interface participating in the routing process.
Explanation: A Cisco router is assigned a router ID to uniquely identify it. It can be automatically assigned and take the value of the highest configured IP address on any interface, the value of a specifically-configured loopback address, or the value assigned (which is in the exact form of an IP address) using the router-id command. Cisco recommends using the router-id command.
Other case:
What is the recommended Cisco best practice for configuring an OSPF-enabled router so that each router can be easily identified when troubleshooting routing issues?
- Use the highest IP address assigned to an active interface participating in the routing process.
- Use a loopback interface configured with the highest IP address on the router.
- Use the highest active interface IP address that is configured on the router.
- a route dynamically learned through the OSPF routing protocol
Explanation: A routing table includes a code that describes how a router learned that particular route. Common codes seen in a routing table include the following:
- L - An address assigned to a local interface
- C - A directly connected network
- S - A static route to a remote network
- O - A route learned through the OSPF routing protocol
- * - A route that is a candidate for a default route
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