Computer Networking
What is the main reason the OSI model was created?

So different networks could communicate.
To create a layered model larger than the DoD model.
So Cisco could use the model.
So application developers can change only one layer's protocols at a time.

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Computer Networking
If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

The highest IP address of any physical interface
The lowest IP address of any physical interface
The lowest IP address of any logical interface
The highest IP address of any logical interface

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