This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Traffic Routing in Wireless Networks”.
1. The type of traffic carried by a network determines the routing service.
a) True
b) False
View Answer
Explanation: The type of traffic carried by a network determines the routing services. It also determines protocols, and call handling techniques which must be employed.
2. Connection oriented services are also called __________
a) Datagram services
b) Virtual circuit routing
c) Connectionless services
d) Routing service
View Answer
Explanation: Connection oriented services are also called virtual circuit routing. In connection oriented routing, the communications path between the message source and destination is fixed for the entire duration of the message.
3. Connectionless services are also called __________
a) Datagram services
b) Virtual circuit routing
c) Connection oriented services
d) Routing service
View Answer
Explanation: Connectionless services are also called datagram services. In a connectionless service, a call set up procedure is not required at the beginning of a call, and each message burst is treated independently by the network.
4. First generation cellular systems provide connectionless services for each voice user.
a) True
b) False
View Answer
Explanation: First generation cellular systems provide connection oriented services for each voice user. Voice channels are dedicated for users at the serving base station.
5. Wireless data networks are not well supported by ___________
a) Datagram services
b) Circuit switching
c) Connectionless services
d) Routing service
View Answer
Explanation: Wireless data networks are not supported by circuit switching. It is due to their short, bursty transmissions which are often followed by periods of inactivity. Circuit switching is best suited for dedicated voice only traffic.
6. Packet switching breaks each message into smaller units.
a) True
b) False
View Answer
Explanation: Packet switching breaks each message into smaller units for transmission and recovery. When a message is broken into packets, a certain amount of control information is added to each packet to provide source and destination identification, as well as error recovery provisions.
7. Header specifies the ___________ of a new packet.
a) Ending
b) Middle part
c) Beginning
d) Data information
View Answer
Explanation: The header specifies the beginning of a new packet. It contains the source address, packet sequence number, and other routing and billing information.
8. The control field contains the ________
a) CRC
b) User data
c) Address
d) ARQ
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Explanation: The control field defines functions such as transfer of acknowledgments, automatic repeat requests (ARQs), and packet sequencing. The information field contains user data. And the final field is the frame check sequence field or the CRC (cyclic redundancy check).
9. Circuit switching provides greater efficiency in comparison to circuit switching.
a) True
b) False
View Answer
Explanation: In contrast to circuit switching, packet switching provides excellent channel efficiency for bursty data transmission of short length. An advantage of packet switched data is that the channel is utilized only when sending or receiving bursts of information.
10. __________ was developed by CCITT to provide standard connectionless network access protocols for three layers of OSI model.
a) Packet switching
b) Datagram routing
c) X.25
d) CDPD
View Answer
Explanation: X.25 was developed by CCITT (now ITU-T) to provide standard connectionless network access (packet switching) protocols for the three layers (layer 1, 2 and 3) of the open systems interconnection (OSI) model.
11. X.25 protocols specify particular data rates.
a) True
b) False
View Answer
Explanation: The X.25 protocol does not specify particular data rates or how packet switched networks are implemented. Rather, X.25 provides a series of standard functions and formats which give structure to the design of the software.
Sanfoundry Global Education & Learning Series – Wireless & Mobile Communications.
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