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Data Communication and Computer Networks MCQ - Functions of OSI and TCP/IP Layers

51 Which one of the following statements is FALSE?

TCP guarantees a minimum communication rate.

52 In TCP, a unique sequence number assigned to each

In TCP, a unique sequence number is assigned to each byte.

53 In the TCP/IP protocol suite, which one of the following is NOT part of the IP header?

In IPv4 header format Destination port filed is not available.

54 A TCP message consisting of 2100 bytes is passed to IP for delivery across two networks. The first network can carry a maximum payload of 1200 bytes per frame and the second network can carry a maximum payload of 400 bytes per frame, excluding network overhead. Assume that IP overhead per packet is 20 bytes. What is the total IP overhead in the second network for this transmission?

Total IP overhead is 120 bytes.

55 Suppose that the maximum transmit window size for a TCP connection is 12000 bytes. Each packet consists of 2000 bytes. At some point of time, the connection is in slow-start phase with a current transmit window of 4000 bytes. Subsequently, the transmitter receives two acknowledgement. Assume that no packets are lost and there are no time-outs. What is the maximum possible value of the current transmit window?

In slow-start phase, for each ACK, the sender increases the current transmit window by Maximum Segment Size (MSS).
As per question, a packet consists of 2000 bytes and that can be taken as MSS. So, after two ACKs, current transmit window
= 4000 + 2000 + 2000
= 8000

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Question:

A router has two full-duplex Ethernet interfaces each operating at 100 Mb/s. Ethernet frames are at least 84 bytes long (including the Preamble and the Inter-Packet-Gap). The maximum…

A. 0.01
B. 3.36
C. 6.72
D. 8

Correct answer: B

Explanation:

Minimum transmission time = (84 bytes) / (2*100 bps) = (84 * 8 bits) / (2*100 bps) = 3.36 seconds

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