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Which one of the following Internet services provides one to one communication?

A. Online chat B. Online messaging C. E-mail D. Usenet

A network that is restricted to use by a single organisation is referred to as:

A. LAN B. WAN C. Internet D. Intranet

In which network architecture there are no client computers and server computers?

A. CSN architecture B. Value added network architecture C. PPN architecture D. All of the above