Computer Science Networking Guide - Set 27 - ObjectiveBooks

Computer Science Networking Guide - Set 27

Practice Test: Question Set - 27


1. Which of the following best illustrates the default subnet mask for a class A, B, and C Network?
    (A) 0.0.0.0, 0.0.0.1, 0.0.1.1
    (B) 255.255.255.0, 255.255.0.0, 255.0.0.0
    (C) 255.0.0.0, 255.255.0.0, 255.255.255.0
    (D) 255.255.0.0, 255.255.255.0, 255.255.255.255

2. The CCITT Recommendation X.25 specifies three layers of communications:
    (A) Application, presentation and session
    (B) Session, transport and network
    (C) Physical datalink and network
    (D) Datalink, network and transport

3. A software that allows a personal computer to pretend it as a terminal is
    (A) Auto-dialing
    (B) Bulletin board
    (C) Modem
    (D) Terminal emulation

4. Error detection at a data link level is achieved by
    (A) Bit stuffing
    (B) Cyclic redundancy codes
    (C) Hamming codes
    (D) Equalization

5. In geosynchronous orbit, satellite
    (A) Remains in a fixed position so that as earth rotates, it can fully cover the earth
    (B) Remains in a fixed position related to points on earth
    (C) Moves faster than the earth's rotation so that it can cover larger portion of earth
    (D) Moves simultaneously

6. An example of a medium-speed, switched communications service is
    (A) Series 1000
    (B) Dataphone 50
    (C) DDD
    (D) None of the above

7. The cheapest modems can transmit
    (A) 300 bits per second
    (B) 1,200 bits per second
    (C) 2,400 bits per second
    (D) 4,800 bits per second

8. CSMA (Carrier Sense Multiple Access) is
    (A) A method of determining which device has access to the transmission medium at any time
    (B) A method access control technique for multiple-access transmission media
    (C) A very common bit-oriented data link protocol issued by ISO
    (D) Network access standard for connecting stations to a circuit-switched network

9. A band is always equivalent to
    (A) A byte
    (B) A bit
    (C) 100 bits
    (D) None of the above

10. A network consists of eight NT servers. You are planning to move servers to different segments of your network, what utility should be used at each server to determine which server generates the most traffic?
    (A) NBTSTAT
    (B) NETSTAT.EXE
    (C) Performance Monitor
    (D) Network Monitor

11. When a group of computers is connected together in a small area without the help of telephone lines, it is called
    (A) Remote communication network (RCN)
    (B) Local area network (LAN)
    (C) Wide area network (WAN)
    (D) Value added network (VAN)

12. An error-detecting code inserted as a field in a block of data to be transmitted is known as
    (A) Frame check sequence
    (B) Error detecting code
    (C) Checksum
    (D) Flow control

13. Compared to analog signals, digital signals
    (A) Allow faster transmission
    (B) Are more accurate
    (C) Both (a) and (b)
    (D) All of the above

14. Which of the following statements is incorrect?
    (A) The difference between synchronous and asynchronous transmission is the clocking derived from the data in synchronous transmission
    (B) Half-duplex line is a communication line in which data can move in two directions, but not at the same time
    (C) Teleprocessing combines telecommunications and DP techniques in online activities
    (D) Batch processing is the preferred processing mode for telecommunication operations

15. An example of digital, rather than analog, communication is
    (A) DDD
    (B) DDS
    (C) WATS
    (D) DDT

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