Computer Networking
Which of the following is a wrong example of network layer?

Source routing and domain naming-USENet
X.25 level 2-ISO
X.25 Packet Level Protocol (PLP)-ISO
Internet Protocol (IP) - ARPANET

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Computer Networking
Messages from one computer terminal can be sent to another by using data networks. The message to be sent is converted to an electronic digital signal, transmitted via a cable, telephone or satellite and then converted back again at the receiving end. What is this system of sending messages called?

Electronic newspaper
Paperless office
Electronic mail
None of these
Global network

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