This set of Computer Network Management Multiple Choice Questions & Answers (MCQs) focuses on “Wired/Wireless Transmission Media”.
1. Narrow-band LAN technology uses _________ mode of transmission.
a) full duplex
b) analog
c) digital
d) half duplex
View Answer
Explanation: Narrow-band LAN technologies are implemented in Telecommunication systems. It is used for carrying voice data on a very limited set of frequencies. Narrow-band uses digital mode of transmission and also is based on Simplex mode that implies, it communicates only in one direction.
2. In a twisted-pair cable, the gauge of the wire and the type of twist determines the _________
a) mode of transmission
b) quality of transmission
c) frequency of transmission
d) channels of transmission
View Answer
Explanation: Twisted-pair cables are mostly applicable in Telephone Systems. The quality of twisted-pair cable decreases with increase in length. Also, the attenuation decreases as the length increases. Thus the gauge of the wire and the type of twist is important in determining the quality of transmission of a twisted-pair cable.
3. The method for taking advantage of optical wavelength of transmission, in order to increase capacity of information in an optical transmission medium is known as __________
a) Wavelength Division Multiplexing (WDM)
b) Time Division Multiplexing (TDM)
c) Frequency Division Multiplexing (FDM)
d) Code Division Multiplexing (CDM)
View Answer
Explanation: Wavelength Division Multiplexing (WDM) is a multiplexing technique that combines a number of optical signals into a single optical fiber. It combines wavelength of these different optical carrier signals and helps in increasing the capacity of optical fibers by decreasing the transmission loss.
4. For an IP based protocol, the MPLS label is inserted between which two headers?
a) IEEE 802.3 MAC header and Network layer IP header
b) IEEE 802.11 MAC header and Transport layer MAC header
c) Transport layer IP header and Network layer IP header
d) Physical layer MAC header and Data Link layer IP header
View Answer
Explanation: MPLS (Multiprotocol Label Switching) label is highly scalable. It operates at the interface between network layer and link layer of the OSI model. Therefore, in an IP based protocol, MPLS label is positioned between IEEE 802.3 MAC header and Network layer IP header.
5. Which of the following uses Bluetooth as a Wireless technology?
a) Personal Area Network
b) Local Area Network
c) Wide Area Network
d) Metropolitan Area Network
View Answer
Explanation: Bluetooth is an example of Wireless technology that is used for exchanging data over short distances. It also provides secure wireless communication. Thus, such a secure and short ranged technology is used Personal Area Networks.
6. What is a Scatternet?
a) It is a group of interconnected Micronets
b) It is a group of interconnected Mininets
c) It is a group of interconnected Intranets
d) It is a group of interconnected Piconets
View Answer
Explanation: Scatternet is a network connecting two or more Piconets having Bluetooth technology incorporated in their network devices. It supports communication between more than 8 devices. Thus, Scatternet can also be defined as interconnected Piconets.
7. Personal Communication Services (PCS) and Digital Cellular Services are based on cell based technology.
a) True
b) False
View Answer
Explanation: Personal Communication Services (PCS) and Digital Cellular Services are the two advanced segments of wireless technology. These segments are important for data communication. Thus they are based on cellular technology and rely on multiple access principle.
8. __________ uses all its energy in gathering data signals at one particular direction.
a) Bidirectional Antenna
b) Unidirectional Antenna
c) Directional Antenna
d) Omnidirectional Antenna
View Answer
Explanation: Directional Antenna helps in increasing the gain of a signal in forward direction or one particular direction. It is also known as beam antenna. It avoids interference of unwanted signals.
9. In wireless communications, how are collisions made oblivious to its users?
a) By hiding nodes in a network
b) By increasing the signal strength
c) By avoiding interference of unwanted signals
d) By exposing the terminals in a network
View Answer
Explanation: In wireless communications, there exists a hidden node problem. This occurs when a node or a station is visible to an Access Point but not to other stations communicating with the Access Point. The main reason behind this is that the stations are out of range of each other and thus collisions cannot be detected.
10. Bluetooth communicates data using low-power radio waves that are within the frequencies ______ and _______
a) 2.304 MHz, 2.382MHz
b) 2.402 MHz, 2.480 MHz
c) 2.304 GHz, 2.382GHz
d) 2.402 GHz, 2.480 GHz
View Answer
Explanation: The frequency band for Bluetooth communication is set by an international agreement. This frequency band is between 2.402 GHz and 2.480 GHz.
Sanfoundry Global Education & Learning Series – Computer Network Management.
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