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Home » Technical » Aptitude Test - 20
Hassan
1. In a _______ topology, a dedicated link connects a device to a central controller.?
A. Ring
B. Bus
C. Mesh
D. Ring
2.A _______ topology is a variation of a star topology.?
A. Ring
B. Bus
C. Mesh
D. Ring
3.The multiplexing technique, in which each input connection has an allotment in the output even if it is not sending data is.?
A. Asynchronous TDM
B. Synchronous TDM
C. FDM
D. Asynchronous TDM
4.Techniques can make the size of the routing table manageable and also handle issues such as:
A. Flow control
B. Error reporting
C. Tunneling
D. Flow control
5.The five components that make up a data communications system are the message, sender, receiver, medium and...?
A. protocol
B. Code
C. connecting device
D. protocol
6.The mobile station moves from one cell to another during a:
A. Optimization
B. Connection
C. Conversation
D. Optimization
7.Parallel transmission is good in speed but it is very?
A. cheap
B. costly
C. time consuming
D. cheap
8.Multiplexing techniques are of:
A. 3 type
B. 4 types
C. 5 types
D. 3 type
9.A digital multiplexing technique for combining several low-rate channels into one high-rate channel is called...?
A. FDM
B. TDM
C. WDM
D. FDM
10.Channels are separated in multiplexing by unused strips of bandwidth guard bands to prevent:
A. Dispersion
B. Noise in channel
C. Overlapping
D. Dispersion
11. Time-division multiplexing multiplexes the :
A. Analog signals
B. Digital signals
C. Both A and B
D. Analog signals
12.An analog multiplexing technique named WDM combines :
A. Electromagnetic signals
B. Optical signals
C. Digital signals
D. Electromagnetic signals
13.Which of the following does not allow multiple uses or devices to share one communication line?
A. doubleplexer
B. multiplexer
C. concentrator
D. doubleplexer
14.A communications device that combines transmissions from several I/O devices into one line is a ?
A. concentrator
B. modifier
C. multiplexer
D. concentrator
15.The sharing of a medium and its link by two or more devices is called _______.?
A. modulation
B. encoding
C. line discipline
D. modulation
16.Which multiplexing technique transmits analog signals?
A. FDM
B. TDM
C. WDM
D. FDM
17.The word ______ refers to the portion of a _______ that carries a transmission.?
A. channel; link
B. link; channel
C. line; channel
D. channel; link
18.We can divide ____ into two different schemes: synchronous or statistical.
A. FDM
B. TDM
C. WDM
D. FDM
19.In ________ TDM, each input connection has an allotment in the output even if it is not sending data.?
A. synchronous
B. statistical
C. isochronous
D. synchronous
20.In ________ TDM, slots are dynamically allocated to improve bandwidth efficiency.?
A. synchronous
B. statistical
C. isochronous
D. synchronous
21.In ________, we combine signals from different sources to fit into a larger bandwidth.?
A. spread spectrum
B. line coding
C. block coding
D. spread spectrum
22._______ is designed to be used in wireless applications in which stations must be able to share the medium without interception by an eavesdropper and without being subject to jamming from a malicious
A. Spread spectrum
B. Multiplexing
C. Modulation
D. Spread spectrum
23.The ______ technique expands the bandwidth of a signal by replacing each data bit with n bits.
A. FDM
B. DSSS
C. FHSS
D. FDM
24.DMT is a modulation technique that combines elements of _______ and _______.?
A. FDM; TDM
B. QDM; QAM
C. FDM; QAM
D. FDM; TDM
25.A band is always equivalent to ...............?
A. a byte
B. a bit
C. 100 bits
D. a byte
26..................... type of multiplexing are used by transport layer to improve transmission efficiency.?
A. upward
B. downward
C. horizontal
D. upward
27.Which of the following delay is faced by the packet in travelling from one end system to another ?
A. Propagation delay
B. Queuing delay
C. Transmission delay
D. Propagation delay
28.Which of these is a standard interface for serial data transmission?
A. ASCII
B. RS232C
C. 2
D. ASCII
29."Parity bits" are used for which of the following purposes?
A. Encryption of data
B. To transmit faster
C. To detect errors
D. Encryption of data
30.Why would a hacker use a proxy server?
A. To create a stronger connection with the target.
B. To create a ghost server on the network.
C. To obtain a remote access connection.
D. To create a stronger connection with the target.
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