The technique that makes possible the task of listening and talking in communication system is called ________

• Simplexing

• Duplexing

• Modulating

• Multiple access technique

Frequency division duplexing provides ____ distinct bands of frequencies for _____ user.

• Two, two

• Two, one

• One, two

• Two ,many

Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?

• CDMA

• CSMA/CA

• Aloha

• Non of the mentioned

Which of the following statements does not describe the S-MAC protocol correctly?

• Energy dissipation is reduced in S-MAC through idle listening

• Implementation of the algorithm is simple

• The sleep and listen vary constantly based on the network traffic conditions

• all of the mentioned

Why is implementation of MAC protocols important in context of WSNs?

• Supports multi-hop communication, alongside single-hop

• Special design for energy-constrained environments

• Support for Ad-hoc node deployment

• all of the mentioned

Which is not a cause for undesired energy wastage in WSNs?

• Sensing of events

• Idle listening

• Overhearing in case of densely deployed sensor networks

• Collision of transmitted frames

What is vulnerable time in Pure Aloha?

• twice the frame time

• half the frame time

• two third of the frame time

• Exactly the frame time

The medium access control (MAC) is a sublayer Of ___________

• data link layer

• network layer

• physical layer

• application layer

Carrier Sense Multiple Access (CSMA) is based on medium called ___________

• Listen and talk

• Listen before sending

• Sense before transmit

• Sense before Collision

Mostly ________ is used in wireless LAN.

• time division multiplexing

• orthogonal frequency division multiplexing

• space division multiplexing

• none of the mentioned