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

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Computer Networking
X.21 is

a very common bit-oriented data link protocol issued by ISO
network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media
None of these
a method of determining which device has access to the transmission medium at any time

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