Computer Networking
The Token-Ring architecture was developed for a more efficient way to determine who should be transmitting at any one time. With Ethernet, collisions may take place, causing the transmitting computers to have to retransmit their data. The use of token guarantees that only one computer can transmit at a time. What happens as the network increases in size? Choose the best answer

The network becomes more efficient
The speed of the Token-Ring network must be 16Mbps if the number of nodes is greater then 500
The network becomes less efficient
An additional token is added for every 1,000 nodes
After the number of nodes exceeds 550, the Multistation Access Unit must be replaced by the more powerful Hyperstation Unified Bandwidth device

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Computer Networking
MAC is

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

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Computer Networking
The packets switching concept was first proposed

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

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