PART- A ( 2 marks)
1. What is the role of DE lint in Frame relay?
2. How does frame relay report congestion?
3. Write Little’s formula.
4. Define Traffic intensity or utilization factor and QOS.
5. What is the difference between committed burst size (Bc) and Excess burst size (Be).
6. Define terms Router, Bridge and Gateway.
7. What is Bluetooth?
8. Distinguish between Poisson and Exponential formulae.
9. How we calculate the percentile of packets transfer at a time in traffic management technique.
10 Define Arrival rate and service rate.
PART - B
1. Explain the single- server and multi server queering models. (16)
2. At an ATM machine in a supermarket, the average length of a transaction is 2 minutes,and on average, customers arrive to use the machine once every 5 minutes, How long is the average time that a person must spend waiting and using the machine? What is the 90th percentile of residence time? On average, how many people are waiting to use the machine? Assume M/M/1. .(16)
3. Consider a frame relay node that is handling a Poisson stream of incoming frames to betransmitted on a particular 1 – Mbps outgoing link. The stream consists of two types of frames. Both types pf frames have the same exponential distribution of frame length with a mean of 1000 bits.
a. Assume that priorities are not used. The combined arrival rate of frame of both types is 800 frames/second. What is the mean residences time (Tr) for all frames?
b. Now assume that the two types are assigned different priorities, with the arrival rate of type 1 of 200 frames/second and the arrival rate of type 2 of 600 frames/second. Calculate
the mean residence time for type 1, type2, and overall.
c. Repeat (b) for _1 = _2 = 400 frames/second.
d. Repeat (b) for _1 = 600 frames/second and _2 = 200 frames/second. . (16)
4. Messages arrive at a switching center for a particular outgoing communications line in a poisson manner with a mean arrival rate of 180 messages per hour. Message length is distributed exponentially with a mean length of 14,400 characters. Line speed is 9600 bps.
a. What is the mean waiting time in the switching center? (6)
b. How many messages will be waiting in the switching center for transmission on the average? (10)
5. a.Explain the effects of congestion. (8)
b. Explain the congestion control mechanisms in networks. (8)
1. What is the role of DE lint in Frame relay?
2. How does frame relay report congestion?
3. Write Little’s formula.
4. Define Traffic intensity or utilization factor and QOS.
5. What is the difference between committed burst size (Bc) and Excess burst size (Be).
6. Define terms Router, Bridge and Gateway.
7. What is Bluetooth?
8. Distinguish between Poisson and Exponential formulae.
9. How we calculate the percentile of packets transfer at a time in traffic management technique.
10 Define Arrival rate and service rate.
PART - B
1. Explain the single- server and multi server queering models. (16)
2. At an ATM machine in a supermarket, the average length of a transaction is 2 minutes,and on average, customers arrive to use the machine once every 5 minutes, How long is the average time that a person must spend waiting and using the machine? What is the 90th percentile of residence time? On average, how many people are waiting to use the machine? Assume M/M/1. .(16)
3. Consider a frame relay node that is handling a Poisson stream of incoming frames to betransmitted on a particular 1 – Mbps outgoing link. The stream consists of two types of frames. Both types pf frames have the same exponential distribution of frame length with a mean of 1000 bits.
a. Assume that priorities are not used. The combined arrival rate of frame of both types is 800 frames/second. What is the mean residences time (Tr) for all frames?
b. Now assume that the two types are assigned different priorities, with the arrival rate of type 1 of 200 frames/second and the arrival rate of type 2 of 600 frames/second. Calculate
the mean residence time for type 1, type2, and overall.
c. Repeat (b) for _1 = _2 = 400 frames/second.
d. Repeat (b) for _1 = 600 frames/second and _2 = 200 frames/second. . (16)
4. Messages arrive at a switching center for a particular outgoing communications line in a poisson manner with a mean arrival rate of 180 messages per hour. Message length is distributed exponentially with a mean length of 14,400 characters. Line speed is 9600 bps.
a. What is the mean waiting time in the switching center? (6)
b. How many messages will be waiting in the switching center for transmission on the average? (10)
5. a.Explain the effects of congestion. (8)
b. Explain the congestion control mechanisms in networks. (8)