Which of the following describe a shortcoming of using hubs that is improved by

Question

Which of the following describe a shortcoming of using hubs that is improved by instead using switches?(could more than one option)

Hubs allow collisions to occur when two attached devices send data at the same time.

Hubs create a single electrical bus to which all devices connect, causing the devices to share the bandwidth.

Hubs restrict the number of physical ports to at most eight.

Hubs limit the maximum cable length of individual cables (relative to switches).

Hubs allow collisions to occur when two attached devices send data at the same time.

Hubs create a single electrical bus to which all devices connect, causing the devices to share the bandwidth.

Hubs restrict the number of physical ports to at most eight.

Hubs limit the maximum cable length of individual cables (relative to switches).

Explanation / Answer

Hi,

The answer for the above question is Option A and B.

A)Hubs allow collisions to occur when two attached devices send data at the same time.

B)Hubs create a single electrical bus to which all devices connect, causing the devices to share the bandwidth.

Some of the disadvantages of Using Hubs:
Half-Duplex:
Network hubs can only communicate in half-duplex mode; they can only send or receive data at any given time. A hub in a network situation is constantly switching between sending and receiving data, which creates an inefficient data flow process. A network switch is able to communicate in full-duplex mode and can send and receive data from every device that it's connected to at once; it doesn't have to switch modes.

Dedicated Bandwidth:
Network hubs share all their bandwidth between every connected device. In a hypothetical situation, a 100-base hub has 100Mbps worth of bandwidth that it can share between four different computers that are sharing the connection. If one computer is sending a large file to another computer, it's going to occupy all the bandwidth and give the other two computers slow network access. Network hubs are at a major disadvantage in this area against network switches that give each device its own dedicated bandwidth. For example, if two of eight computers connected to the same network switch are sending large files back and forth, the other six computers will still have full bandwidth available.

Device Differentiation:
Hubs are at a disadvantage against switches in networking because hubs are unable to differentiate between the devices on the network. If one computer is trying to reach another on a hub-based network, the computer will send the message to every other computer on the network, consuming bandwidth for each transfer. If one computer is trying to reach another on a switch-based network, the switch recognizes which computer the information is supposed to go to and only sends it to that computer, which dramatically cuts down on data traffic.

Network Size:
Hubs are unable to support networks that are as large as switches because hubs send all traffic to all devices on the network. The more devices you add, the slower the network gets, eventually becoming unusable. Switches direct network traffic so they can be used to encompass networks consisting of dozens of devices without a problem. Hubs, however, may start to have performance issues when more than eight devices are sharing the connection; hub networks often feed up to a switch to work around this issue.

Advantages of Network Switches:
There are many advantages to using a network switch for communication. Network switches handle network traffic successfully, while making efficient use of the available network bandwidth.

Packet Handling of Network Switches:
The ability to route packages to designated end locations is one of the key advantages to using network switches. This is a great leap forward from hubs, which are only able to send packages without specification from one device to all other devices attached to their network. This ability to designate specific end locations prevents Ethernet collisions from occurring.

Collision Management of Network Switches:
Collisions generally occur when multiple computing devices attempt to transmit information simultaneously. This in turn causes the signals to collide on the wire. The devices must then try to retransmit the data at a later time. In general, the more devices on a network switch, the greater number of collisions that are likely to result. Network switches eliminate collisions by creating a direct on-the-fly connection between the sending and receiving devices or computers. This improves performance and efficiency across the network, allowing for complete bandwidth availability.

Bandwidth Utilisation of Network Switches:
Network switches allow for the availability of the full gigabit of bandwidth for each connection. This means that network performance remains unaffected by multiple devices working on the same switch. Network switches are therefore able to send and receive data at the same time, unlike hubs.

Problem Isolation of Network Switches:
Each device operates on its own wire within a network switch. This makes it easier to pinpoint the area of concern if a problem arises on a given switch port. It also allows other devices to continue to function normally without disruption.

Hope this was useful.

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