17 Questions
In p-persistent CSMA, what does a node do once the medium is no longer busy?
Decides to transmit with a certain probability
What is the basis of Wi-Fi's CSMA method?
p-persistent CSMA
What does a node do in non-persistent CSMA when it finds the channel busy?
Waits for a random backoff and then re-senses the channel
What does p represent in p-persistent CSMA?
Probability to transmit
Which CSMA method involves continuously sensing the channel until it becomes idle?
Non-persistent CSMA
What does the throughput metric (S) in MAC protocols represent?
The quantity of traffic the network was able to send
Which metric quantifies the time separating when a frame is given to the MAC layer and when it is sent?
D
In modeling assumptions for MAC protocols, what type of distribution does the offered load (G) respect?
Poisson distribution
What is the performance impact of loss due to synchronization and guard intervals in deterministic MAC protocols?
Decrease in throughput (S)
Which performance evaluation method states that all transmissions eventually converge to zero?
Slotted Aloha
In probabilistic MAC protocols, what leads to a decrease in the network's ability to absorb offered load?
Overhead of distribution (random backoff)
In Slotted Aloha, how does the improvement help in reducing collisions?
Nodes send traffic at the start of predefined timeslots
Which statement best describes the concept of Clear Channel Assessment (CCA) in random access with channel sensing?
CCA involves checking the energy level on the channel
What is the main purpose of CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) in avoiding collisions?
To prevent collisions by sensing the channel before transmission
In CSMA 1-persistent method, what does a node do if the channel is busy?
The node listens and waits for the channel to become idle
Which statement best describes p-persistent CSMA in terms of persistence levels?
p-persistent CSMA varies the persistence level depending on 'p'
What distinguishes Non-persistent CSMA from 1-persistent CSMA?
1-persistent CSMA keeps trying to transmit without regard for channel status
Learn about how Slotted Aloha improves performance by reducing collisions. This quiz covers the concept of Slotted Aloha and its benefits in comparison to Pure Aloha in a multiple access scenario.
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