Cisco Certified Network Associate (CCNA) Practice Exam

What command is used to force a new OSPF DR election?

1. #clear ip ospf process

2. #reset ospf

3. #force ospf election

4. #show ip ospf

The correct answer is: #clear ip ospf process

The command that is used to force a new OSPF Designated Router (DR) election is "clear ip ospf process." When this command is executed, it effectively resets the OSPF process on the router, which leads to the renegotiation of neighbor relationships. This refresh allows the OSPF protocol to reevaluate its topology and elect a new DR if necessary. In OSPF, the DR and Backup Designated Router (BDR) are essential for reducing broadcast traffic in multi-access networks, such as Ethernet. If the current DR becomes unreachable or if there are changes in the OSPF network topology, a new election may be warranted to ensure optimal routing. Regarding the other command options, "reset ospf" does not exist; thus, it cannot serve this purpose. The command "force ospf election" is also not a valid command in Cisco's IOS for OSPF operations. Lastly, the command "show ip ospf" is primarily used for displaying OSPF information rather than initiating an election. Therefore, "clear ip ospf process" is the only correct choice for forcing a new DR election, as it directly accomplishes that by resetting OSPF configurations and relationships.