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- Question
Which of the following statement is correct?
Options- A. Satellite transponders use a higher frequency for reception of radiation from earth stations and lower frequency for transmission to earth stations.
- B. Satellite transponders contain a device that echos the radiation without change from one point on earth to another
- C. Satellite transponder contain devices that transform the message sent from one location on earth to a different code for transmission to another location
- D. satellite transponders us lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations
- E. None of the above
- Correct Answer
- Satellite transponders use a higher frequency for reception of radiation from earth stations and lower frequency for transmission to earth stations.
- 1. What function does a serial interface perform in data communication?
Options- A. Converts serial data into audio signals
- B. Converts analog signals into digital signals
- C. Converts parallel data into a stream of bits
- D. Decodes incoming signals into computer data
- E. None of the above Discuss
- 2. A modem is connected in between a telephone line and a
Options- A. network
- B. computer
- C. communication adapter
- D. serial port
- E. None of the above Discuss
- 3. Eight stations are competing for the use of the shared channel using the modified Adaptive free walk protocol by Gallager. If the stations 7 and 8 are suddenly become ready at once, how many bit slots are needed to resolve the contention?
Options- A. 1 slots
- B. 5 slots
- C. 10 slots
- D. 14 slots Discuss
- 4. Which of the following connectivity devices is used to extend a network on a purely mechanical basis?
Options- A. Gateway
- B. Switch
- C. Router
- D. Active hub Discuss
- 5. The IEEE 802 project of the 1980s involved further defining the lower two layers of the OSI model. A number of standards were agreed upon during that time. Which of the following is the standard for Ethernet?
Options- A. 802.2
- B. 802.3
- C. 802.4
- D. 802.5
- E. 802.6 Discuss
- 6. Modulation in which the two binary values are represented by two different amplitudes of the carrier frequency is known as
Options- A. Amplitude-shift keying
- B. Amplitude
- C. Amplitude modulation
- D. Aloha
- E. None of the above Discuss
- 7. You have been contracted to install a windows NT network in an office that is located in a strip mall. The office is located next to the power plant of the building, so a UPS (uninterruptible power supply) has already been installed. What type of cable should you use for the network cabling? Choose the best answer.
Options- A. TI
- B. UTP
- C. Fiber-optic
- D. PSTN
- E. STP Discuss
- 8. When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in metres permitted in this null-modem connection?
Options- A. 80
- B. 100
- C. 30
- D. 150
- E. None of the above Discuss
- 9. The data-link layer, in reference to the OSI model, specifies
Options- A. data link procedures that provide for the exchange of data via frames that can be sent and received
- B. the interface between the X.25 network and packet mode device
- C. the virtual circuit interface to packet-switched service
- D. All of the above
- E. None of the above Discuss
- 10. The core diameter of a single-mode fibers is about
Options- A. 10 times the wavelength of the light carried in the fiber
- B. 10 times the fiber radius
- C. 7 times the light carried in the fiber
- D. 3 times the wavelength of the light carried in the fiber
- E. None of the above Discuss
Networking problems
Search Results
Correct Answer: Converts parallel data into a stream of bits
Correct Answer: communication adapter
Correct Answer: 5 slots
Correct Answer: Active hub
Correct Answer: 802.3
Correct Answer: Amplitude-shift keying
Correct Answer: STP
Correct Answer: 30
Correct Answer: data link procedures that provide for the exchange of data via frames that can be sent and received
Correct Answer: 10 times the wavelength of the light carried in the fiber
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