Computer networks miscellaneous

Computer networks miscellaneous

Easy Questions

Computer Networks

Computer networks miscellaneous
  1. What is the maximum size of data that the application layer can pass on to the TCP layer below?








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    The default TCP Maximum Segment Size is 536. Where a host wishes to set the maximum segment size to a value other than the default, the maximum segment size is specified as a TCP option, initially in the TCP SYN packet during the TCP handshake. Because the maximum segment size parameter is controlled by a TCP option, a host can change the value in any later segment.

    Correct Option: A

    The default TCP Maximum Segment Size is 536. Where a host wishes to set the maximum segment size to a value other than the default, the maximum segment size is specified as a TCP option, initially in the TCP SYN packet during the TCP handshake. Because the maximum segment size parameter is controlled by a TCP option, a host can change the value in any later segment.

  1. In the slow start phase of the TCP congestion control algorithm, the size of the congestion window








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    Slow start is one of the algorithm that TCP uses to control congestion inside the network, also known as exponential growth phase, here the TCP congestion window size is increased.

    Correct Option: D

    Slow start is one of the algorithm that TCP uses to control congestion inside the network, also known as exponential growth phase, here the TCP congestion window size is increased.

  1. While opening a TCP connection, the initial sequence number is to be derived using a time-of-day (ToD) clock that keeps running even when the host is down. The low order 32 bits of the counter of the ToD clock is to be used for the initial sequence numbers. The clock counter increments once per millisecond. The maximum packet lifetime is given to be 64s. Which one of the choices given below is closest to the minimum permissible rate at which sequence numbers used for packets of a connection can increase?








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    Since if we increment 1 per 1 ms and life time of packet is given 64 s. But i think question is not asking in this scenario . TCP uses Sliding Window Protocol. Here Minimum Permissible rate may be confusing but think like that if life time of packet is given 64s so this is max. Means if we increment seq. no per 64 sec is allowed but more than 64s should not be allowed. If we keep more than 64s for 1 sequence number we need to wait for next sequence without any reason. so ans should be = 1 / 64 s = 0.015 /s

    Correct Option: A

    Since if we increment 1 per 1 ms and life time of packet is given 64 s. But i think question is not asking in this scenario . TCP uses Sliding Window Protocol. Here Minimum Permissible rate may be confusing but think like that if life time of packet is given 64s so this is max. Means if we increment seq. no per 64 sec is allowed but more than 64s should not be allowed. If we keep more than 64s for 1 sequence number we need to wait for next sequence without any reason. so ans should be = 1 / 64 s = 0.015 /s

  1. One of the header fields in an IP datagram is the Time To Live (TTL) field. Which of the following statements best explains the need for the field?








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    Time to live (TTL) is a limit on the period of time or transmissions in computer and computer network technology that a unit of data (e.g., a packet) can experience before it should be discarded. If the limit is not defined then the packets can go into an indefinite loop. The packet is discarded when the Time to live field reaches 0 to prevent looping.

    Correct Option: D

    Time to live (TTL) is a limit on the period of time or transmissions in computer and computer network technology that a unit of data (e.g., a packet) can experience before it should be discarded. If the limit is not defined then the packets can go into an indefinite loop. The packet is discarded when the Time to live field reaches 0 to prevent looping.

  1. The transport layer protocols used for real time multimedia, file transfer, DNS and e-mail, respectively are








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    The Transport layers protocols used for
    l. Real Time Multimedia can be unreliable but has to be tast so UDP.
    2. File Transfer has to be secure and reliable so uses TCP.
    3. DNS Domain name system can be both TCP and UDP
    4. Email User TCP for reliability. Hence, answer is option (c) UDP, TCP, UDP and TCP

    Correct Option: C

    The Transport layers protocols used for
    l. Real Time Multimedia can be unreliable but has to be tast so UDP.
    2. File Transfer has to be secure and reliable so uses TCP.
    3. DNS Domain name system can be both TCP and UDP
    4. Email User TCP for reliability. Hence, answer is option (c) UDP, TCP, UDP and TCP