Bissoy.com
Doctors Medicines MCQs Q&A

A and B are two stations on a Ethernet. Each has a steady queue of frames to send. Both A and B attempts to retransmit after a frame collide and A wins the first back off race. At the end of this successful transmission by A, both A and B attempt to transmit and collide. The probability that A wins the second back off race is

A and B are two stations on a Ethernet. Each has a steady queue of frames to send. Both A and B attempts to retransmit after a frame collide and A wins the first back off race. At the end of this successful transmission by A, both A and B attempt to transmit and collide. The probability that A wins the second back off race is Correct Answer 0.625

A

B

win

0

0

Collision

0

1

A

0

2

A

0

3

A

1

0

B

1

1

Collision

1

2

A

1

3

A

 

In the above scenario one having low value will win the race and if both selects same value collision will occur. So out of 8 cases A wins 5 times that is 5/8=0.625

Related Questions

How does a host on an Ethernet LAN know when to transmit after a collision has occurred?
1. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
2. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
3. You can improve the CSMA/CD network by adding more hubs.
4. After a collision, the station that detected the collision has first priority to resend the lost data.
5. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.
Fact 1: Eyeglass frames cost between $35 and $350.
Fact 2: Some eyeglass frames are made of titanium.
Fact 3: Some eyeglass frames are made of plastic.

If the first three statements are facts, which of the following statements must also be a fact?
I: Titanium eyeglass frames cost more than plastic frames.
II: Expensive eyeglass frames last longer than cheap frames.
III: Only a few eyeglass frames cost less than $35.
A double-ended queue supports operations like adding and removing items from both the sides of the queue. They support four operations like addFront(adding item to top of the queue), addRear(adding item to the bottom of the queue), removeFront(removing item from the top of the queue) and removeRear(removing item from the bottom of the queue). You are given only stacks to implement this data structure. You can implement only push and pop operations. What’s the time complexity of performing addFront and addRear? (Assume ‘m’ to be the size of the stack and ‘n’ to be the number of elements)
A Double-ended queue supports operations such as adding and removing items from both the sides of the queue. They support four operations like addFront(adding item to top of the queue), addRear(adding item to the bottom of the queue), removeFront(removing item from the top of the queue) and removeRear(removing item from the bottom of the queue). You are given only stacks to implement this data structure. You can implement only push and pop operations. What are the total number of stacks required for this operation?(you can reuse the stack)
You have your laptop directly connected into a router's Ethernet port. Which of the following are among the requirements for the copy flash tftp command to be successful?
1. TFTP server software must be running on the router.
2. TFTP server software must be running on your laptop.
3. The Ethernet cable connecting the laptop directly into the router's Ethernet port must be a straight-through cable.
4. The laptop must be on the same subnet as the router's Ethernet interface.
5. The copy flash tftp command must be supplied the IP address of the laptop.
Due to the technical snag in the signal system two trains start approaching each other on the same track from two different stations, 240 km away each other. When the train starts a bird also starts moving to and fro between the two trains at 60 kmph touching each train each time. The bird initially sitting on the top of the engine of one of the trains and it moves so till these trains collide. If these trains collide one and half hour after start, then how many kilometers bird travels till the time of collision of trains?
Researchers have developed a three-person brain network called BrainNet that lets participants send or receive thoughts from each other. Further, researchers claimed that the network records electrical activity and transcranial magnetic stimulation in the brain, to transmit information without invasion as it can send one bit of a data at a time. Which of the following determines the given statement? I: BrainNet records electrical activity and transcranial magnetic stimulation in the brain. II: BrainNet can send more than one bit of data at a time. III:  BrainNet is a three-person brain network developed to transmit information. 
The Token-Ring architecture was developed for a more efficient way to determine who should be transmitting at any one time. With Ethernet, collisions may take place, causing the transmitting computers to have to retransmit their data. The use of token guarantees that only one computer can transmit at a time. What happens as the network increases in size? Choose the best answer
John, Jack, Joseph and Jordan participated in a running race. Only the winner finished the race in 10 minutes. Which two pieces of information can tell you who the winner was? (i) John finished the race in 16 minutes . (ii) Joseph finished the race earlier than Jack by 2 minutes. (iii) Jack finished the race later than Jordan by 4 minutes. (iv) Jordan finished the race earlier than John by 6 minutes. (v) John finished the race later than Joseph by minutes.
Five circular frames of different sizes are kept on a table. Frame E is bigger than C only. Frame B is bigger than E but smaller than A. A is the biggest frame. D is smaller than B. How many frames are smaller than D?