WHAT IS LAN SWITCHING:-LAN switching is a form of packet switching in which the data packets are transferred from one computer to another over a network. Switching technologies are vital to network design, as these technologies permit the traffic to be sent only where it is required; in most of the cases, making use of fast, hardware-based methods. LAN switching technology helps to improve the overall efficiency of local area networks and address the existing bandwidth issues.


A network device that cross-connects clients, servers and network devices. Also known as a “frame switch,” stand-alone LAN switches are common in Ethernet networks. A switch with four or more ports is also built into a wired or wireless router for homes and small business (see wireless router).

A local area network (LAN) consists of a series of computers linked together to form a network in a circumscribed location. The computers in a LAN connect to each other via TCP/IP ethernet or Wi-Fi. A LAN is normally exclusive to an organization, such as a school, office, association or church.

The function of Switching is to switch data packets between devices on the same network (or same LAN – Local Area Network). The function of Routing is to Route packets between different networks (between different LANs – Local Area Networks). Switches operate at Layer 2 of the OSI Model (Datalink Layer).

What is LAN switching what are its benefits?

Switches are a fundamental part of most networks. They let multiple users communicate directly with each other. As such, they offer the potential for collision-free, high-speed networking. In essence, switches create a system of simultaneous, parallel, point-to-point connections between pairs of devices.

Is a switch LAN or WAN?

The majority of routers have a single LAN port and single WAN port, while a switch will have multiple ports for different devices to communicate within the LAN such as PCs and printers. The router will allow PCs and other connected devices to access the internet and other networks.

LANs (local area networks) are easy to establish, but complex to maintain. For LANs, different networking techniques are used to implement and maintain. LAN switching includes mainly 4 types of switching. They are as follows:

  1. Layer 2 Switching:

Layer 2 switching is hardware-based switching. It makes use of the (media access control (MAC) addresses on the network interface cards (NICs) of the host to determine the location to forward the frames.

Advantages of layer 2 switching

its high data transmission speed with low latency and cost.

  1. Layer 3 switching:

Layer 3 switching provides similar functionality as router. Some fundamental functions are as follows:

Uses TL (time to live) Identify paths on the basis of logical addressing Offers security Enables hardware-based packet forwarding Offers highly efficient packet switching High speed data transmission with low latency

  1. Layer 4 switching:

An enhanced version of layer 3 switching, layer 4 switching uses hardware-based switching with the addition of applications like Telnet and FTP. Layer 4 switching uses routing on the basis of port numbers. Access list filtering completely functions on layer 4 switching. The most significant advantage of layer 4 switching is that the network admin is able to configure a layer 4 switch for prioritizing data traffic by application, which implies that a quality of service (QoS) may be defined for every user.

  1. Multi-Layer Switching:

Multi-layer switching (MLS) provides low latency and high performance. All three-layer switching (2, 3 and 4) are combined in MLS. MLS makes use of the following while making switching decisions: Source and destination address (MAC and IP) Protocols details (fields) Source port number and destination port number.

Why LAN is important?

Resource Sharing: LAN provides resource sharing such as computer resources like printers, scanners, modems, DVD-ROM drives, and hard disks can be shared within the connected devices. This reduces cost and hardware purchases.

Computers, tablets and smartphones connected to a network are considered LAN devices, as are the router and modem found in most homes and small offices. Smart appliances can also be LAN devices if they are connected to your network