Transport Layer

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Question 1

Which of the following transport layer protocols is used to support electronic mail?

  • SMTP

  • IP

  • TCP

  • UDP

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Question 2

Consider an instance of TCP’s Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of the slow start phase is 2 MSS and the threshold at the start of the first transmission is 8 MSS. Assume that a timeout occurs during the fifth transmission. Find the congestion window size at the end of the tenth transmission.

  • 8 MSS

  • 14 MSS

  • 7 MSS

  • 12 MSS

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Question 3

Match the following: 1

  • (1)

  • (2)

  • (3)

  • (4)

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Question 4

A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT
 

  • block entire HTTP traffic during 9:00PM and 5 :0OAM
     

  • block all ICMP traffic
     

  • stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address
     

  • block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM
     

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Question 5

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?

  • 0.015/s

  • 0.064/s

  • 0.135/s

  • 0.327/s

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Question 6

The maximum payload of a TCP segment is:
  • 65,535
  • 65,515
  • 65,495
  • 65,475
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Question 7

Suppose there are n stations in a slotted LAN. Each station attempts to transmit with a probability P in each time slot. The probability that only one station transmits in a given slot is _______.

  • nP(1 – P)n – 1

  • nP

  • P(1 – P)n – 1

  • nP(1 – P)n – 1

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Question 8

The TCP sliding window

  • can be used to control the flow of information

  • always occurs when the field value is 0

  • always occurs when the field value is 1

  • occurs horizontally

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Question 9

A device is sending out data at the rate of 2000 bps. How long does it take to send a file of 1,00,000 characters ?
  • 50
  • 200
  • 400
  • 800
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Question 10

Consider a subnet with 720 routers. If a three-level hierarchy is chosen with eight clusters, each containing 9 regions of 10 routers, then total number of entries in the routing table is __________.
  • 25
  • 27
  • 53
  • 72
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