Computer Networking
The packets switching concept was first proposed

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

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Computer Networking
X.21 is

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

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Computer Networking
What does the passive command provide to dynamic routing protocols?

Stops the router from sending any dynamic updates.
Stops an interface from sending periodic dynamic updates but not from receiving updates.
Stops the router from receiving any dynamic updates.
Stops an interface from sending or receiving periodic dynamic updates.

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