$114$

a$)$ For traffic that operates under delay constraints, which is better: packet

switching or circuit switching? $($Or are they both the same?$)$ Explain

$515$

b$)$ Why is an Aloha network much less efficient than CSMA$/$CD$?$ In what

application is Aloha more appropriate than CSMA$/$CD$?$

$115$

c$)$ Give two features of a data stream that make packet switching better than

circuit switching, and explain in one sentence each and Give two features of a data stream that make circuit switching better than packet switching, and explain in one sentence each.

$115$

d$)$ The LTE $[$cellular telephone$]$ standard supports only packet switching.Why did LTE make this change from earlier standards such as GSM$?$ What cellular services are most affected by this change?

$316$

e$)$ Briefly explain the operation of a token$-$ring network. Are collisions

possible in token ring? Explain.

$116$

f$)$ State whether CDMA and Public switched telephony is most useful for packet switching or circuit switching

$417$

G$)$ Is the token ring protocol appropriate for a wireless network? Briefly

explain.

$517$

h$)$ Of packet switching and circuit switching, which one requires centralized

scheduling of resources? Brieny explain

$418$

i$)$In the OSI seven$-$layer model, what tasks are allocated to the medium access $($MAC$)$ sub layer?