A network switch connects devices (such as computers, printers, and wireless access points) in a network to each other and allows them to “talk” by exchanging data packets. Switches can be hardware devices that manage physical networks as well as software-based virtual devices.
What is “Switch”?
It is a networking device that transfers data only to the host where it is being addressed. It checks the destination address to route the packet appropriately.
The following are features of the network switches:
It operates at layer 2 (data link layer). It is available in various configurations and as per data transfer speeds such as 10/100/1000 Mbps or 10/100 Gbps. It operates in full duplex mode. Packet collision is avoided due to port-to-port data transmission.
A network switch is a computer networking device that connects network segments or network devices. The term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model. Switches that additionally process data at the network layer (layer 3) and above are often referred to as layer-3 switches or multilayer switches.
A switch is a telecommunication device that receives a message from any device connected to it and then transmits the message only to the device for which it was meant. This makes the switch a more intelligent device than a hub (which receives a message and then transmits it to all the other devices on its network). The network switch plays an integral part in most modern Ethernet local area networks (LANs). Mid-to-large sized LANs contain a number of linked managed switches. Small office or home office (SOHO) applications typically use a single switch or an all-purpose converged device such as a residential gateway to access small office or home broadband services such as DSL or cable Internet. In most of these cases, the end-user device contains a router and components that interface with the particular physical broadband technology. User devices may also include a telephone interface for VoIP.
An Ethernet switch operates at the data link layer of the OSI model to create a separate collision domain for each switch port. With four computers (e.g., A, B, C, and D) on four switch ports, any pair (e.g., A and B) can transfer data back and forth while the other pair (e.g., C and D) can also do so simultaneously, and the two conversations will not interfere with one another. In full duplex mode, these pairs can also overlap (e.g., A transmits to B, simultaneously B to C, and so on). In the case of a repeater hub, they would all share the bandwidth and run in half duplex, resulting in collisions, which would then necessitate retransmissions.
Benefits of Switches:
Capacity is increased—
They increase the accessible data transfer capacity of the organization.
They help in lessening the outstanding burden on individual host PCs.
Presentation of Increments –
They improve the presentation of the organization.
Less casing effects
Networks that use switches will have fewer cascading impacts. This is because of the way switches create impact areas for every association.
Switches can be associated straightforwardly with workstations.
Broadens the Bandwidth-
It increases the available bandwidth of the network.
Fewer collisions between frames—
Networks that use switches will have fewer frame collisions.
Since the switch is isolated, data will go only to the destination.
Switches have many features that make them different than hubs. The most compelling reason to choose a switch rather than a hub is bandwidth. When a 100Mbps hub has five workstations, each receives 20Mbps of bandwidth. When a 10/100Mbps switch is used, each workstation receives 100Mbps of bandwidth, dramatically increasing the speed of the connection. Switches also run in full duplex mode, which allows data to be sent and received across the network at the same time. Switches effectively double the speed of the network when compared to hubs, which only support half duplex mode.
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