Question

 

Which protocol layer defines the process by which LAN devices can access the shared medium?

		a. MAC
		b. LLC
		c. physical layer
		d. IP

Select the correct statement(s) regarding the use of DSSS and OFDM on IEEE 802.11 WLANs.

		a. DSSS and OFDM are more spectrally efficient than traditional FDM
		b. DSSS and OFDM are both spread spectrum techniques that are easy to implement and less complicated than traditional FDM
		c. DSSS and OFDM are only used on guided IEEE 802.3 LANs
		d. all statements are correct

Answer 1

1)a) MAC

Explanation :

The medium access control (MAC) sublayer defines the process by which LAN devices can access the shared medium.The medium access control (MAC) is a sublayer of the data link layer of the open system interconnections (OSI) reference model for data transmission. It is responsible for flow control and multiplexing for transmission medium. It controls the transmission of data packets via remotely shared channels.

2)d) all statement are correct

Explanation:

Today’s 802.11 family is divided into much more substandard but in this thesis it will be an overview of IEEE 802.11a, 802.11 b and 802.11 g. Further discuss, WLANs have a high-rate data issues and identify some key research for future of WLAN on basics of OFDM and comparison performance between 802.11a and 802.11g.