Podcast
Questions and Answers
In a nonpersistent CSMA protocol, what is the first step when the medium is idle?
In a nonpersistent CSMA protocol, what is the first step when the medium is idle?
- Increase the contention window size
- Listen to the medium
- Transmit immediately (correct)
- Wait for a random amount of time
For unslotted nonpersistent CSMA, what factor reduces the probability of collisions?
For unslotted nonpersistent CSMA, what factor reduces the probability of collisions?
- Packet transmission time
- Random backoff time (correct)
- Propagation delay
- Data rate
What is the throughput equation for slotted nonpersistent CSMA?
What is the throughput equation for slotted nonpersistent CSMA?
- (αGe^-2αT) / ((1 - e^-αG) + α)
- (1 - e^-αG) / (1 + α) (correct)
- (1 - e^-αG) / (1 + α) (correct)
- (1 + e^-αG) / (1 - α)
What happens if the backoff time in nonpersistent CSMA is too long?
What happens if the backoff time in nonpersistent CSMA is too long?
Which factor influences the throughput in nonpersistent CSMA protocols?
Which factor influences the throughput in nonpersistent CSMA protocols?
What is the purpose of Distributed Inter Frame Space (DIFS) in CSMA/CA?
What is the purpose of Distributed Inter Frame Space (DIFS) in CSMA/CA?
How does a terminal choose when to start transmitting after DIFS in CSMA/CA?
How does a terminal choose when to start transmitting after DIFS in CSMA/CA?
When does a terminal freeze its backoff counter in CSMA/CA?
When does a terminal freeze its backoff counter in CSMA/CA?
What does the contention window determine in CSMA/CA?
What does the contention window determine in CSMA/CA?
In CSMA/CA, what happens if a terminal tries to transmit and senses the medium is busy?
In CSMA/CA, what happens if a terminal tries to transmit and senses the medium is busy?
Why does a terminal pick a random number of slots within the contention window before transmitting in CSMA/CA?
Why does a terminal pick a random number of slots within the contention window before transmitting in CSMA/CA?
What does DIFS stand for in the context of wireless communication?
What does DIFS stand for in the context of wireless communication?
What happens when the backoff interval of a node reaches zero in a CSMA/CA protocol?
What happens when the backoff interval of a node reaches zero in a CSMA/CA protocol?
In the context of the text, what does CW = 31 refer to?
In the context of the text, what does CW = 31 refer to?
What role does Random Delay play in the CSMA/CA protocol?
What role does Random Delay play in the CSMA/CA protocol?
Why does a node freeze its backoff interval when it detects the medium as busy?
Why does a node freeze its backoff interval when it detects the medium as busy?
What is the purpose of Distributed Inter Frame Spacing (DIFS) in wireless communication?
What is the purpose of Distributed Inter Frame Spacing (DIFS) in wireless communication?
