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            SWITCH

Switch is a computer networking device that is used to connect many devices together on a computer network also it called network switch. A switch is considered more advanced than a hub because a switch will on send msg to device that needs or request it.Switches are a type of networking device similar to hubs,which connect network equipment together.In today's high-performance network environment switches have replace both hubs and bridges.

 ● What is a switch networking?

= > In a network, a switch is a hardware device that filters and forwards network packets from one networking devics (switch, rrouter, computer, server etc) to another. It is widely used in local area networks (LANş)  to send each incoming message frame by looking at the physical device address, known as the Media Access Control address(MAC).

Actually, a switch is considered as a multiport network bridge that uses hardware addresses to process and    forward data at the data link layer of  the OSI model. Some switches can also process data at the network layer by combining routing function.Such switches or multilayer switches.

● Uses of switch in networking:

                   It's uses MAC address of network cards  to  route packets to the correct port.

● function of switch in networking:

=> They are:

° Saving cost

° easy installation

° low latency

° Eliminating collision

● Some of the Features of the network switches are as follows:

° It operates at layer-2( data link layer).

° Operates is full duplex mode.

° Packet collision is avoided due to port to port data transmission.

° It is available in various configurations and as per data transfers speeds such as 10/100/1000Mbps or 10/100Gbps.

Types of the network switches are:

i) Unmanaged switch

ii) Managed switch

I) Unmanaged switch:

                       In networking, an unmanaged switch is used to achieve basic connectivity without any configuration interface or options. 

II) Managed switch:

                        Comparing with an unmanaged switch, the managed switch also called smart switchea as they need. It brings greater security and targeted networking to users.

● Although you can use the ports on the back of a router or modem to connect a few Ethernet devices together, switches offer a number of  its advantages:

° Switches allow us to connect dozens of devices.

° Switches allows us to monitor usage.

° Switches keep traffic between two devices from getting in the way of our other devices on the same network.

° Switches allow communication that's even faster than the Internet.

¤ Switches allow to control who access to various parts of the network.

● It's disadvantages:

° They are more expensive comapre to network  bridges.

° Broadcast traffic may be troublesome.

° Network connectivity issues are difficult to be traced through the  network switch.

° Proper design and configuration is needed in order to handle multicast packets.

°  If switches are in promiscuous mode, they are vulnerable to security attacks e.g. spoofing IP address or capturing or ethernet frames. 

            THANKYOU !!!