Process Identifier for OSPF Configuration

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OSPF (Open Shortest Path First) is a popular routing protocol used in computer networks, and it allows routers to share information about the network topology with each other. When configuring OSPF on a router, the command "router ospf" is used, and a process identifier must be specified after the command.

The following are two statements that describe the process identifier used in the command to configure OSPF on a router:

A. All OSPF routers in an area must have the same process ID.

This statement is true. All routers in the same OSPF area must use the same process ID to ensure that they can communicate with each other properly. If different routers in the same area use different process IDs, they will not be able to form adjacencies with each other, which will result in routing problems.

C. Different process identifiers can be used to run multiple OSPF processes.

This statement is also true. Different process IDs can be used to run multiple OSPF processes on a single router. This is useful in scenarios where different OSPF configurations are required for different parts of the network. However, it's important to note that each OSPF process must have a unique process ID.

The other answer options are not correct:

B. Only one process number can be used on the same router. This statement is false, as mentioned in the previous statement, multiple process IDs can be used to run multiple OSPF processes on the same router.

D. The process number can be any number from 1 to 65,535. This statement is true, as the process ID can be any number from 1 to 65,535.

E. Hello packets are sent to each neighbor to determine the process identifier. This statement is false. Hello packets are used to establish neighbor relationships and exchange information about the network topology. They do not contain information about the process identifier. The process ID must be configured manually on each router.