Which of the following statements are true? A) The Open Systems Interconnection

Question

Which of the following statements are true?

A) The Open Systems Interconnection (OSI) model (ISO/IEC 7498-1) contains 7 layers

B) The standard Unix command, ping, is used to determine whether there is a route between a sender and any specified destination address.

C) Computers accessible via the Internet can not have the ping service disabled.

D) The standard Unix traceroute command identifies the sequence of computers and routers through which a packet traveled.

1. A, B, and D

2. A, B, C, and D

3. A, C, and D

4. B, C, and D

Explanation / Answer

As per my understanding, option A, B and D are true. I am not sure about option C.

Still, I will go with option 2 as I came across several cases, where system is connected to Internet and it is still not reachable through Ping command.

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