Q1.

a) Illustrate the meaning of the hidden and exposed terminals? What happens in the case of such terminals if Aloha, reservation Aloha, slotted Aloha or MACA is employed?

b) What are the advantages of spread spectrum? describe frequency-hopping spread spectrum.

c) What do you mean by the term Basic Service Set (BSS)? The 802.11 standard supports the formation of two different types of BSSs: ad hoc network and Infrastructure BSS. Describe in brief.

Q2.

a) Describe any five configuration parameters which are required to adapt TCP to wireless environments.

b) Describe how selective retransmission is a helpful extension of TCP. Are there any demerits of this approach?

Q3.

a) What do you mean by the term pervasive computing? describe the implications in terms of technological needs of two fundamental features of pervasive applications: mobility and context-awareness.

b) describe in brief any two of the given:

• Methods used to reduce energy consumption and to expand network lifetime.
• Wireless Security Threats.
• Multi-media object transfer (MOT) protocol.