3. "Sloted ALOHA improves the performance of system over pure ALOHA".Justify [5]

Slotted ALOHA improves the performance of the system over pure ALOHA in several ways:

1. Increased Throughput: In Slotted ALOHA, time is divided into slots and each slot corresponds to a frame. This means that a node can only send the frame at the beginning of the slot. This reduces the chances of collision and thus increases the throughput. In pure ALOHA, there are no time slots, so the frames can collide more frequently.

2. Reduced Collisions: In Slotted ALOHA, since the frames are sent at the beginning of the time slot, the chances of collision are reduced to half as compared to pure ALOHA. This is because in pure ALOHA, a frame sent at time 't' can collide with frames sent in the time interval 't-1' to 't+1'. But in Slotted ALOHA, a frame sent at time 't' can only collide with a frame sent at the same time 't'.

3. Efficient Use of Bandwidth: Slotted ALOHA makes more efficient use of available bandwidth because it reduces the likelihood of collisions. In pure ALOHA, a high rate of collisions can lead to a lot of bandwidth being wasted.

4. Synchronization: In Slotted ALOHA, all the nodes are synchronized with the time slot. This means that all nodes know when a time slot starts and ends. This is not the case in pure ALOHA, where nodes can send data at any time, leading to a higher chance of collisions.

5. Predictability: Slotted ALOHA provides more predictability in terms of when a transmission can take place. This can help in planning and managing network traffic more effectively.

In conclusion, Slotted ALOHA improves the performance of the system over pure ALOHA by reducing collisions, increasing throughput, making more efficient use of bandwidth, and providing more predictability.