6.3-2. Pure Aloha and CSMA. Which of the following statements is true about both Pure Aloha, and CSMA (both with and without collision detection?Group of answer choicesThere can be simultaneous transmissions resulting in collisions.Pure Aloha and CSMA can achieve 100% utilization, in the case that there is only one node that always has frames to sendThere can be times when the channel is idle, when a node has a frame to send, but is prevented from doing so by the medium access protocol.Pure Aloha and CSMA can achieve 100% channel utilization, in the case that all nodes always have frames to send.

Which of the following is true about the CSMA/CD algorithm?Question 5Select one:The algorithm never allows collisions to occur.The algorithm works with only two devices on the same Ethernet.None of the other answers are correct.Collisions can happen, but the algorithm defines how the computers should notice a collision and how to recover.

6.3-1. Channel partitioning protocols. Which of the following statements is true about channel partitioning protocols?Group of answer choicesChannel partitioning protocol can achieve 100% utilization, in the case that there is only one node that always has frames to sendChannel partitioning protocols can achieve 100% channel utilization, in the case that all nodes always have frames to send.There can be simultaneous transmissions resulting in collisions.There can be times when the channel is idle, when a node has a frame to send, but is prevented from doing so by the medium access protocol.

Which transmission media utilizes CSMA/CA to control collisions?

Consider a wireless sensor network using the 802.15.4 standard for low-power, low-data-rate communication in a smart building.In this scenario, sensor nodes collect environmental data and communicate using the 802.15.4 standard. Additionally, the network employs a mesh topology to extend coverage and increase reliability. The system uses CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) for efficient medium access control.Given this 802.15.4-based wireless sensor network in a smart building, which of the following statements are true?(i) 802.15.4 efficiently supports high-data-rate communication in this smart building scenario.(ii) The use of 802.15.4 ensures high levels of security, making it resistant to cyber threats in this smart building ecosystem.(iii) The mesh topology enhances network coverage and reliability in this 802.15.4-based system.(iv) CSMA/CA is not used in this network because it can lead to frequent collisions.(v) The use of 802.15.4 in this smart building system may result in longer battery life for sensor nodes.(vi) A significant challenge in this 802.15.4-based smart building network is managing network congestion and ensuring timely data delivery.Select the correct statements:Select one:a. (i), (iii), and (v) are true.b. (ii) and (iv) are true.c. (iii), (v), and (vi) are true.d. (i), (iii), and (iv) are true.

Explain ALOHA protocol