Computer Networking
The method of communication in which transmission takes place in both directions, but only one direction at a time is called

Four wire circuit
Full Duplex
Half Duplex
Simplex

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Computer Networking
The packets switching concept was first proposed

None of these
in the late 1980s for the Defense Ministry of US.
All of these
in the late 1950s for Defense Ministry of US
in the early 1960s for military communication systems, mainly to handle speech

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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 172.16.0.0 0.0.255.255
access-list 10 deny 172.16.48.0 255.255.240.0
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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