# CSMA/CA in Wireless & Mobile Systems Quiz

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## 17 Questions

### In a nonpersistent CSMA protocol, what is the first step when the medium is idle?

Transmit immediately

### For unslotted nonpersistent CSMA, what factor reduces the probability of collisions?

Random backoff time

### What is the throughput equation for slotted nonpersistent CSMA?

(1 - e^-αG) / (1 + α)

### What happens if the backoff time in nonpersistent CSMA is too long?

It wastes idle time

### Which factor influences the throughput in nonpersistent CSMA protocols?

Random delay duration

### What is the purpose of Distributed Inter Frame Space (DIFS) in CSMA/CA?

To define the period of time each terminal must wait before transmitting

### How does a terminal choose when to start transmitting after DIFS in CSMA/CA?

By picking a random number of slots within the contention window

### When does a terminal freeze its backoff counter in CSMA/CA?

When other terminals start transmitting during its backoff time

### What does the contention window determine in CSMA/CA?

The number of slots each terminal must wait before transmitting

### In CSMA/CA, what happens if a terminal tries to transmit and senses the medium is busy?

It waits until the current transmission ends and then starts DIFS countdown

### Why does a terminal pick a random number of slots within the contention window before transmitting in CSMA/CA?

To introduce random delays and minimize collisions

### What does DIFS stand for in the context of wireless communication?

Distributed Inter Frame Space

### What happens when the backoff interval of a node reaches zero in a CSMA/CA protocol?

The node immediately transmits its data

### In the context of the text, what does CW = 31 refer to?

Contention Window

### What role does Random Delay play in the CSMA/CA protocol?

It helps nodes choose random backoff intervals

### Why does a node freeze its backoff interval when it detects the medium as busy?

To reduce the probability of collision

### What is the purpose of Distributed Inter Frame Spacing (DIFS) in wireless communication?

To introduce a delay between transmissions by different stations

Test your knowledge about CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) in Wireless & Mobile Systems based on the book 'Introduction to Wireless & Mobile Systems, 4th Edition' by Agrawal and Zeng. The quiz covers topics like Contention, DIFS (Distributed Inter Frame Spacing), Contention Window, Medium Busy, and Backoff mechanisms.

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