Computer Networking
Which of the following technique is used for encapsulation?

a technique used in best-effort delivery systems to avoid endlessly looping packets.
All of these
None of these
One of the pieces that results when an IP gateway divides an IP datagram into smaller pieces for transmission across a network that cannot handle the original datagram size
a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame.

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Computer Networking
The network layer, in reference to the OSI model, provide

the interface between the X.25 network and packet mode device
data link procedures that provide for the exchange of data via frames that can be sent and received
the virtual circuit interface to packet-switched service
All of these
None of these

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