單項(xiàng)選擇題The corporate head office of TestKing has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence,what will happen?()

A. UDP will send an ICMP Information Request to the source host.
B. UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
C. UDP will drop the datagrams.
D. UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.
E. UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.


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1.多項(xiàng)選擇題Although TCP segments differ from UDP segments, they both contain some common fields. What two segments do they share in common?()

A. source address
B. options
C. sequence number
D. sources
E. destination port
F. checksum

2.多項(xiàng)選擇題Which of the following protocols utilize TCP?()

A. NTP
B. NNTP
C. SMTP
D. SNMP
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4.多項(xiàng)選擇題Which of the following protocols utilize UDP as the layer 4 transport mechanism?()

A.TACACS
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C.SMTP
D.SNMP
E.HTTP
F.TFTP

5.多項(xiàng)選擇題Which of the protocols below use TCP at the transport layer?()

A.TFTP
B.SMTP
C.SNMP
D.FTP
E.HTTP
F.HTTPS

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