Cisco Certified Network Associate (CCNA) Practice Exam

Which command will configure the OSPF network type to broadcast?

1. (config)#interface SERIAL INTERFACE

2. (config-if)#ip ospf network broadcast

3. (config-if)#network broadcast ip

4. (config)#router ospf broadcast

The correct answer is: (config-if)#ip ospf network broadcast

The command that correctly configures the OSPF network type to broadcast is the one that is precisely meant for setting the OSPF network type within a specific interface. When using OSPF, the network type can be configured to define how routers communicate with each other in a broadcast environment, such as Ethernet. The command to use in this context is `ip ospf network broadcast`, which, when entered in interface configuration mode, sets the OSPF operation on that interface to broadcast. This is significant in Ethernet environments where multiple devices can connect and communicate without needing to establish a point-to-point connection first. By doing this, OSPF can send multi-access messages to all other routers on the same LAN segment, leveraging the properties of the broadcast network type effectively for routing updates and maintain the OSPF neighbor relationships. The other options do not serve the intended purpose of configuring OSPF to broadcast. Some options refer to interface configuration commands or incorrect syntax that do not align with the correct configuration methodology for OSPF network types. Thus, identifying and utilizing the correct command is key for proper OSPF operation and network efficiency.