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

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

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Computer Networking
You want to create a standard access list that denies the subnet of the following host: 172.16.50.172/20. Which of the following would you start your list with?

access-list 10 deny 172.16.64.0 0.0.31.255
access-list 10 deny 172.16.48.0 0.0.15.255
access-list 10 deny 172.16.48.0 255.255.240.0
access-list 10 deny 172.16.0.0 0.0.255.255

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