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

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Computer Networking
The packets switching concept was first proposed

All of these
in the early 1960s for military communication systems, mainly to handle speech
in the late 1950s for Defense Ministry of US
in the late 1980s for the Defense Ministry of US.
None of these

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