Computer Networking
Establishing a virtual connection is functionally equivalent to

Placing a telephone call prior to a conversation
Connecting as virtual memory
Placing a modem prior to a conversation
None of these
Physically connecting a DTE and DCE

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Computer Networking
The Internet Control Message Protocol (ICMP)

allows gateways to send error a control messages to other gateways or hosts
reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem
All of these
None of these
provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another

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