Computer Networking
Which of the following describes an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model?

xDSL
VPN
Cable
HDLC
IPSec

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Computer Networking
Synchronous protocols

are generally used by personal computers
allow faster transmission than asynchronous protocols do
are more reliable
None of these
transmit characters one at a time

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Computer Networking
What is split horizon?

It splits the traffic when you have a large bus (horizon) physical network.
It prevents regular update messages from reinstating a route that has gone down.
Information about a route should not be sent back in the direction from which the original update came.
It holds the regular updates from broadcasting to a downed link.

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