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1._______ is used for supervisory messages at the Internet Protocol layer. A)TCP B)DNS C)DHCP D)ICMP 2.In...

1._______ is used for supervisory messages at the Internet Protocol layer.

A)TCP

B)DNS

C)DHCP

D)ICMP

2.In the Domain Name System, there is/are ______ root server(s), which is/are the highest level server(s).

A)no

B)one

C)more than one

D)none of the above

3.Which of the following is likely to dominate in VoIP as signaling protocol?

A)SIP.

B)H.323.

C)IP

D)Both A and B

4.Which of the following offers more reliable antivirus protection?

A)Antivirus software on user PCs.

B)Antivirus software on the mail server.

C)Both A and B are about equally reliable.

D)None of the above

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Answer #1

1. D   ICMP is used for supervisory messages at IP layer.

.2. D In DNS, there are more than one root servers.These are at top level .

3. A   SIP is currently dominating in VoIP as signaling protocol

4. A Antivirus of PC is more reliable as there are other sources of virus rather than via mail

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