Computer Networking
Which statements are true regarding ICMP packets?1. They acknowledge receipt of a TCP segment.2. They guarantee datagram delivery.3. They can provide hosts with information about network problems.4. They are encapsulated within IP datagrams.

2 and 3
1 only
3 and 4
2, 3 and 4

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Computer Networking
MAC is

a method access control technique or multiple-access transmission media
network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued to ISO.
a method of determining which device has access to the transmission medium at any time
None of these

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