Friday 24 May 2019

Computer Networks Quiz

1.Bridge works in which layer of OSI model ?

A.    Application

B.    Transport

C.    Network

D.   Datalink

2. Flow control mechanisms are used at both levels 2 and 3 of X.25 (T/F) True

3. Name the types of packet switching  Datagram and Virtual Ciruit

4.Provides a connection oriented reliable service for sending messages




      All of the above


5.Which of the following layer is called as end to end layer ? Transport

6.Routers operate in which layer

A.    Layer 1

B.    Layer 3

C.    Layer 4

D.   Layer 7

7.What is the use of bridge in network ?

      To connect LANs

      To separate LANs

      To control Network speed

      All of the above


8.What is the meaning of bandwidth in network?

      Transmission capacity for communication channel

      Connected computers in the network

      Class of IP used in Network

      None of the above


9.Computer network is

A.    Collection of hardware components and computers

B.    Interconnected by communication channel

C.    Sharing of resources and information

D.   All of the above

10.Circuit Switching Network

A.    There is a dedicated communication path between two stations (end-to-end)

B.    The path is a connected sequence of links between network nodes

C.    On each physical link, a logical channel is dedicated to the connection.

D.   All of the above

E.     Only A and B

F.     Only A

11. If a message of length 6400 bits is to be transmitted with the data rate of 9900 bits per  second with  0.026secs calculate the transmission delay for circuit switching  = msg length / data rate

12.Hub is a   

A.    Broadcast device

B.    Unicast device

C.    Multicast device

D.   None of the above

13.Switch is a 

A.    Broadcast device

B.    Unicast device

C.    Multicast device

D.   None of the above

14.Which of the following describe router functions?  

A.    Packet switching

B.    Packet filtering

C.    Internetwork communication

D.   Path selection

E.     All of the above

15.Segmentation is done in

A.    Transport layer

B.    Network layer

C.    Data link layer

D.   Physical layer

16.Which of the following layer does error checking of data ? 

A.    Data link layer

B.    Network layer

C.    Transport layer

D.   Physical layer

17. Name the layer present in X.25   Physical,Link,Packet

18. Which layer in TCP/IP protocol deals with port addresses?

A.    Data link layer

B.    Physical Layer

C.    Transport Layer

D.   Network Layer

E.     Applcation Layer

19.Circuit switching has 

A.    Fixed bandwidth

B.    Dynamic bandwidth

C.    Both A and B

D.   Only A

20.What is the difference between Frame Relay and X.25 ?

Layers , U and control plane

21. What types of delay are significant in assessing the performance of a packet switching  network ?

A.    Transmission delay

B.    Processing delay

C.    Queuing delay

D.   All of the above

E.     Only A and B

22.Datagram packet switching has no call set up phase (T/F)  TRUE

23. Name the types of Switching Network. Draw the chart shows all types of switching networks ?

24. Congestion control done in

A.    MAC layer

B.    Data link layer

C.    Transport layer

D.   Application layer

25. The physical layer is responsible for the transmission of __  over the physical medium

A.    Packets

B.    Bits

C.    Message

D.   Segment

E.     All of the above

26.Frame Relay has  

A.    3 layers

B.    2 layers

C.    1 layer

D.   4 layers

E.     Only A and B

27.In virtual circuit the packet moves on     

A.    Preplanned path

B.    Fixed path

C.    Any route

D.   Both A and B

E.     Only C

28.Start and stop bits are used in serial communication for  

A.    Error detection

B.    Error correction

C.    Synchronization

D.   Slowing down the communication

29.A Routing table contains  

A.    The destination network IP

B.    The hop count

C.    Next hop router IP

D.   All of the above

30.Protocols are      

A.    Agreements on how communication components and DTE’s are to communicate

B.    Logical communication channel used for transferring data

C.    Physical communication channel used for transferring data

D.   None of the above

31.Fixed packet size P = 2568,the overhead bits per packet H=14 the data rate is 6780 bits per second calculate the no of packets required in packet switching.     Data rate / (fixed pkt size  overhead bits)

32. In circuit switching the message arrives in the same order that it was originally sent. (T/F)    TRUE

33.In a broad sense a railway track is an example of  

A.    Simplex

B.    Half duplex

C.    Full duplex

D.   All of the above

34.A packet switching network 

A.    Is free

B.    Can reduce the cost of the using information utility

C.    Allows communication channels to be shared among more than one user

D.   Both B and C

35.A device that can convert digital signals to analog

A.    A packet

B.    A modem

C.    An emulator

D.   None of the above

36.Communication via circuit switching involves three phases which are    

A.    Circuit establishment,data transfer,circuit disconnect

B.    Circuit establishment data commpression circuit disconnect

C.    Data transfer data compression circuit disconnect

D.   Circuit establishment,data compression

37.Local are networks can transmit

A.    Faster than telecommunications over public telephone lines

B.    Slower than telecommunication over public lines

C.    By using twisted or coaxial cable

D.   Both A and C

38.Working of the WAN generally involves    

A.    X.25

B.    Frame relay

C.    ATM

D.   All of the above

39.The X.25 standard specifies a 

A.    Technique for dial access

B.    Technique for start stop data

C.    Data bit rare

D.   DTE/ DCE interface

40. A bridge can    

A.    Filter a frame

B.    Forward a frame

C.    Extend a LAN

D.   All of the above

41.A local area network  

A.    That connects thirty personal computers can provide more computing power than a minicomputer

B.    Control error detection and correction

C.    Constructs packets of data and sends them across the network

D.   None of the above

42.In space division Technique

A.    Signal path are physically separate from one another(divided into space) – simple crossbar matrix or multistage space division switch

B.    it involves the partitioning of lower speed bit stream into pieces that share higher speed stream with other bit stream. The pieces or slots are manipulated by control unit.

C.    Both A and B

D.   Only B

43.Which layer of OSI model is responsible for semantics and syntax of data ?      

A.    Application

B.    Presentation

C.    Session

D.   Transport

44. The store and forward mechanism is used in

A.    Packet switching

B.    Message switching

C.    Circuit Switching

D.   Datagram switching

45.In packet switching Control info contains at least    

A.    Routing (addressing) info, so as to be routed to the intended destination

B.    Recall the content of an IP header

C.    Both A and B

D.   Only A

E.     Only B

46.A repeater takes a weak and corrupted signal and _______ it

A.    Amplifies

B.    Regenerates

C.    Resembles

D.   Reroutes

47.The following is the characteristics of packet switching 

A.    Each packet should contain addressing information

B.    For a best effort delivery service a connection set up phase is not required

C.    Packets can be of arbitrary length

D.   All of the above

48.Which layer of OSI provides  reliable process to process message delivery and error recovery  

A.    Transport Layer

B.    Physical Layer

C.    Data Link Layer

D.   Presentation Layer 

49.The total delay for the switching network is sum of  

A.    Set up time

B.    Propagation delay

C.    Process delay

D.   Transmission delay

E.     All of the above

F.     Only A B and D

G.   Only B C and D

50.In ATM 

A.    Packets are of fixed size

B.    Packets are of different size

C.    Packets vary in sizes

D.   Size is decided first

51.At network layer protocol defined by TCP/IP is 

A.    TCP

B.    UDP

C.    IP

D.   None of the above

52.What are the advantages of Packet Switching

A.    Line efficiency

B.    Data rate conversion

C.    In circuit-switching, a connection could be blocked if there lacks free resources

D.   Priorities can be used

E.     All of the above

F.     Only B,C and D

53.Name the layers of TCP/IP model Link,Internet,Transport,application

54.Virtual circuits are

A.    More reliable

B.    Less reliable

C.    More flexible

D.   None of the above

55. Which of the following is not an advantage of synchronous transmission over asynchronous transmission  ?

A.    Can be used effectively for high volumes of data

B.    High level of error detection can be incorporated

C.    Each byte is protected by a separate parity bit

D.   Self clocking facility of encoding systems can be effectively used

56.A dedicated transmission path is given in 

A.    Circuit switching

B.    Datagram packet switching

C.    Virtual circuit packet switching

D.   A and B

E.     Only A

57. X.25, Frame Relay, ATM are examples of

A.    Circuit Switching

B.    Packet Switching

C.    Both A and B

D.   Only B

E.     Only A

58. What is common in X.25 and Frame Relay

A.    U – plane

B.    C – plane

C.    Both A and B

D.   Only A

59.What is the unit of communication at Network Layer

A.    Bits

B.    Datagram

C.    Packets

D.   Segments

E.     Frames

F.     Both B and C

G.   Both C and D

60. The ________will change from hop to hop, but the _____________remain the same

A.    Physical addresses , logical addresses

B.    Logical addresses, physical addresses

C.    Logical addresses , port addresses

D.   Physical addresses , port addresses