Explain what a collision domain is. How many collision domains exist on a switch
ID: 3847778 • Letter: E
Question
Explain what a collision domain is.
How many collision domains exist on a switch?
One for every port on the switch.
24 / 48, depending on the model of the switch
The switch is a collision domain.
One for every fiber interface on the switch.
How many collision domains exist on a hub?
1.
24 / 48, depending on the model of the hub.
The hub, and all devices connected to it, are apart of the same collision domain.
The links between the hub and the client devices, but not the uplink (like the connection to the ISP), are in the same collision domain.
Each copper interface is a collision domain.
How do devices in the same collision domain deal with collisions?
1.
Devices wait until the line is clear. After four seconds of line clarity, the device will send out a marker flag containing the length of the transmission, where all other clients will wait that amount of time. The client begins to forward the traffic, and once it is finished, it sends a 'FIN' flag to inform the devices that it has finished (as a confirmation method).
Devices wait until the line is clear, and then begin to send the frame. As it sends the frame, it listens for collisions, and if one is detected, each device sends a jamming signal to ensure all devices in the collision domain recognize the collision, and then wait a random time until it begins transmitting.
At random intervals, the device will begin to forward traffic on the line. If a collision is detected, it waits to transmit the next packet.
Devices talk over each other on the collision domain, regardless of who is listening.
1.One for every port on the switch.
2.24 / 48, depending on the model of the switch
3.The switch is a collision domain.
4.One for every fiber interface on the switch.
Explanation / Answer
Collision domain : It is an area in a network where two ethernet frames can collide on one link between two devices. If one device emits and if the other device emits data at the same time, it creates the collision. Members of a collision domain may be involved in collisions with one another. Devices outside the collision domain do not have collisions with those inside.collisions decreases Network performance.
4 )
On Ethernet, any device can try to send a frame at any time. Each device senses whether the line is idle and therefore available to be used. If it is, the device begins to transmit its first frame. If another device has tried to send at the same time, a collision is said to occur and the frames are discarded. then jaming signal will be sent .so that each device know the collision. Each device then waits a random amount of time and retries until successful in getting its transmission sent.
so ans is 2.
2. Each port of switch is a collison domain
Each collsion domain consists of device and switch port it self. This means switch increasing collison domains but reducing collisions. so answer is 1.One for every port on the switch.
3.hub collison domain consists of all devices connected to it.
hub forms only one collision domain.
All the devices attached to a hub are belong to one collision domain, which means if two hosts try to send data at the same time, a collision will occur. here collisions are more.
so ans is 2.The hub, and all devices connected to it, are apart of the same collision domain.
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