Q1. True of False.
1. The localarea network (LAN) is slower than the wide area network
(WAN), but it covers larger geographical areas. ( )
2. Circuit switching is a communication method where a dedicated
communication path, or circuit, is established between two devices before
data transmission begins. ( )
3. Circuit switching is not transparent to users. ( )
4. ATM technology is known as cell relay because data is broken and
transmitted in a series of cells in variable size. ( )
5. The Cell loss priority (CLP) in cell header format of ATM provides
guidance to network in the event of congestion. ( )
6. TCP and UDP are transmission control protocols where UDP is less
reliable than TCP. ( )
7. The number of layers in OSI model is 6. ( )
8. Simple Mail Transfer Protocol (SMTP) is a common TCP/IP
application protocol that provides a basic electronic mail facility. ( ).
9. The data unit name in the internet layer is datagram. ( )
10. In pure ALOHA protocol, the time is slotted. ( )
Answers
1. F
2. T
3. F
4. F
5. T
6. T
7. F
8. T
9. T
10. F
Q2. Multiple Choice
1. A noiseless channel with a bandwidth of 6 kHz transmitting a signal with 4 signal
levels. The maximum bit rate is
a. 24 Kbps.
b. 12 Kbps.
c. 7.2 Kbps.
d. 4 Kbps.
2. A telephone line normally has a bandwidth of 3000 Hz (300 to 3300 Hz) assigned for
data communication. The SNR is usually 35dB. What will be the capacity for this
channel?
(a) 34882 bps
(b) 24882 bps
(c) 15510 bps
(d) 24178 bps
3. Which of the following is an example of UBR applications?
a. Text transfer.
b. Messaging.
c. Remote terminal.
d. All of above.
4. Which of following is an advantage of ATM technology?
a. It supports significantly fast data transfer for long distance.
b. It uses fixed-size cells that simplifies processing at ATM nodes.
c. It has minimal error and flow control capabilities that reduce overhead processing
and size.
d. All of above.
5. Generic Flow Control (GFC) is employed in the header of the ATM (Asynchronous
Transfer Mode) cell at the UNI (User to Network Interface) interface. GFC is used
a. To alleviate short-term overload conditions in network.
b. For routing to and from end user.
c. To detect error code.
d. None of the above.
6. Timing is a key feature of a protocol that refers to
a. When data can be transmitted and how fast.
b. Format of the data blocks.
c. Meaning of each field in the data.
d. None of the above.
7. Which TCP/IP layer controls routing to allow data to traverse multiple
interconnected networks?
a. Internet Layer.
b. Application Layer.
c. Physical Layer.
d. None of the above.
8. The layer that specifies the nature of signals being transmitted along the medium is
called:
a. Network access layer.
b. Physical layer.
c. Internet layer.
d. Transport layer.
9. Which of the following sentences is correct?
a. In pure ALOHA protocol, every station must check whether the channel is free
or not before transmitting data.
b. The time in p-Persistent CSMA Protocol is continuous.
c. In nonpersistent CSMA Protocol, the packets can be sent only during a slotted
period.
d. In pure ALOHA protocol, every station transmits data without checking
whether the channel is free or not before transmitting data.
10. In a network, If P is the only packet being transmitted and there was no earlier
transmission, which of the following delays could be zero?
a. Propagation delay.
b. Queuing delay.
c. Transmission delay.
d. Processing delay
11. In ________ each station sends a frame whenever it has a frame to send.
a. pure ALOHA
b. slotted ALOHA.
c. both (a) and (b)
d. neither (a) nor (b)
12. In ______, the chance of collision can be reduced if a station senses the medium
before trying to use it.
a. MA.
b. CSMA.
c. FDMA.
d. CDMA.
Answers
1. A 2. A 3. D 4. D 5. A 6. A 7. A 8. B 9. D. 10. B 11. A 12. D
