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Data communications quiz

Quiz by Daniel Rubin-Grøn

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23 questions
Show answers
  • Q1
    True or False: A protocol defines the format and the order of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.
    False
    True
    Impossible to answer
    45s
  • Q2
    If the distance between two nodes is increased from 10 meters to 100 meters, which delay gets bigger?
    The processing delay
    The queuing delay
    The transmission delay
    The propagation delay
    45s
  • Q3
    What is a packet called in the link layer?
    A message
    A segment
    A datagram
    A frame
    45s
  • Q4
    Which transport layer protocol does SMTP use?
    None of the others
    TCP
    UDP
    TCP or UDP
    45s
  • Q5
    Which of the following transport services are not provided by the Internet?
    Congestion control
    Guaranteed throughput
    Security services
    Reliable data transfer
    45s
  • Q6
    True or False: When a mail is sent using SMTP (Simple Mail Transfer Protocol), the message is encrypted.
    False
    Impossible to answer
    True
    45s
  • Q7
    True or False: When your computer sends a DNS query it sends it to the root DNS server.
    True
    False
    Impossible to answer
    45s
  • Q8
    True or False: Finding a path from one node to another in a large network is a transport layer function.
    False
    True
    Impossible to answer
    45s
  • Q9
    Which of the following is correct:
    UDP does not provide any of the other listed services
    UDP provides Reliable data transfer
    UDP provides Multiplexing and demultiplexing
    UDP provides Congestion control
    45s
  • Q10
    True or False: Host A is sending a large file over a TCP connection. Assume that host B has no data to send to host A. Host B will not send acknowledgements to host A because host B cannot piggyback the acknowledgements on data.
    Impossible to answer
    False
    True
    45s
  • Q11
    Suppose host C sends two TCP segments back to back to host D over a TCP connection. The first segment has sequence number 658 and acknowledgement number 657. The second segment has seq. 674 and ack. 773. How much data is in the first segment?
    773-657 = 116 bytes
    773-674 = 99 bytes
    674-658 = 16 bytes
    674-657 = 15 bytes
    45s
  • Q12
    In a TCP segment header, there is a receive window field. What does the value in this field signify?
    The number of in-transit-bytes the network can handle
    The unused buffer size in bytes of the receiver
    None of the other options
    The total buffer size in bytes of the receiver
    45s
  • Q13
    IPv6 increases the size of the IP address from x bits to y bits, ensuring that the world won't run out of IP addresses. What is the value of x and y?
    x = 32, y = 128
    x = 8, y = 16
    x = 32, y = 64
    x = 4, y = 16
    45s
  • Q14
    Which of the following is a type of switching fabric inside a router?
    All of the others
    Memory
    Crossbar
    Bus
    45s
  • Q15
    45s

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