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Ring: It is a simple linear array where end nodes are associated. It is equal to a mesh with wrap around connections. The data transfer in a ring is generally one direction. So, one disadvantages to this network is that some data transfer can necessitate N/2 links to be travelled (such as nodes 1 & 2) where N is total number of nodes.
Figure: Ring network
Describe autonomous system?
Some multiple WAN methods are defined below: ARPANET: It start in 1960's. It was operated by Advanced Research Project Agency, which is a company of US defense department.
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