What Is Layer 3 switch  What’s the Difference Between  Layer 2 and 3 Switch
layer 3 switch

What Is Layer 3 switch What’s the Difference Between Layer 2 and 3 Switch

A switch is a device responsible for moving data packets in a local network. The switch is beneficial in ensuring that the data packet is sent to the right destination. Usually, this is a very common problem in a hub in that the data packet gets lost due to heavy traffic. A switch becomes aware of the MAC address and the port of the particular device. Hence, the data packet is sent to the particular host only. There are major two types of switching as explained below Layer 2 switch and Layer 3 switch.

What is Layer 2 switching?

When it comes to the layer 2 switch, this specific term has been adopted from the Open System Interconnect (OSI) model, which acts as the reference model to explain and describe the network communications. It is a procedure in which devices and MAC addresses on a LAN segment are used to segment a network. Switches and bridges are the most common components to be used in layer 2 switching. These both help to break up large-sized collision domains into smaller ones. Layer 2 Ethernet switches take much less time for evaluation at the network layer header information making them faster than the routers. 

Also, Read | What Is OSI Model and How It works

Functions of layer 2 switching

Below mentioned are some vital functions of the layer 2 switches:

  • Layer 2 switching helps to know the MAC addresses from all the incoming frame’s source addresses.
  • Communication between bridges and switches becomes possible by using STP to remove bridging loops.
  • The layer 2 switching performs the same functions as performed by the transparent bridge.
  • Specialized hardware, called as Application-Specific Integrated Circuits (ASIC) is used to forward the frames.
  • The switching functions are also performed by the layer 2 switches so that data frames can be rearranged from the source to their destination

Advantage of Layer2 Switching

Below mentioned are some important benefits or pros of the layer 2 switch:

  • Based on the MAC addresses layer 2 switches help to forward the data packets.
  • No setup or management is offered by the layer 2 switches.
  • Layer 2 switch can be easily deployed at a much lower cost.
  • Accounting capabilities are flown by the layer 2 switches.
  • These types of switches offer low latency and enhanced security.

Limitation of Layer2 Switching

Below-mentioned is some limitations or cons of the layer 2 switching switches:

  • It is imperative for the layer 2 switches to correctly break up the collision domains.
  • The broadcast domains are not broken up by default.
  • Implementation of any intelligence is not allowed by layer 2 switches when forwarding the packets.
  • Layer 2 switches do not allow users to perform switching or IP address-based routing.
  • No guaranteed required bandwidth is given to the VoIP users

Applications Of Layer 2 Switch

Here are some of the potential applications of Layer-2 switches:

  • It is suitable for sending a data frame from source to destination in the same Network
  • IT companies’ servers can be located at a central place and allow multiple locations, clients, to access the data easily with no hassle.
  • Companies use Layer 2 switch to conduct the internal communications.
  • Software developers use these switches for tool sharing while keeping them centrally at a single server location.

What is Layer 3 Switching?

It is the layer 3 switches that perform routing functions along with switching. With this type of layering, it becomes easy to combine the functionality of a switch and a router. Layer 3 is the switch that is used to connect devices that are on the same subnet or virtual LAN.

When it comes to supporting routing protocols, then this type of CISCO network switch comes in handy. It becomes easy to inspect the incoming packets and make the routing decisions depending on the addresses of source and destination. This way layer 3 switch plays the role of both a switch and router.

Functions of layer 3 switching

Below mentioned are some vital functions of layer 3 switchings:

  • Based on the logical addressing paths are defined.
  • Security is provided by the layer 3 switches.
  • The layer 3 switches run layer three checksums.
  • Processes and responses to the optional information. 
  • Allows the users to update the simple Network Management
  • Provides access to Information Base (MIB) information. 

Advantage of Layer3 Switching

Below mentioned are some important benefits or pros of the layer 3 switching switches:

  • Routing between virtual LANs is supported by layer 3 switches.
  • These types of switches offer improved fault isolation.
  • Users can easily manage the security.
  • The volumes of broadcast traffic are reduced to a great extent.
  • Now that there is no requirement for a separate router between each VLAN, the configuration process for VLANs becomes easy.
  • Offers separate routing tables which further results in the better segregation of the traffic.
  • Layer 3 switches offer flow accounting and high-speed scalability.
  • Lower network latency is offered by the layer 3 switches as a packet doesn’t make additional hops go through a router. 

Layer 2 Switch Vs Layer-3 Switches Must-Know Differences

Below mentioned are some key differences between layer 2 switching and layer 3 switching

LAYER 2 SWITCHING    LAYER 3 SWITCHING
  The main application of layer 2 switching is to minimize the traffic on the local network.    The main application of layer 3 switching is to implement VLAN.
  When it comes to layer 2 switching, then in it packets are routed from the source to the destination port.    layer 3 switching, sometimes is taken by the switches to check the data packets before the best route to direct the packets from the source to the destination port is identified.  
  To discover the MAC addresses of the other devices, Address Resolution Protocol (ARP) is used by layer 2 switching.    For routing with Virtual LANs (VLANs) IP addresses are utilized by the devices in layer 3 switchings.
  Layer 2 switch offers little tendency to switch the data packets from one port to the other one.    Whereas, layer 3 switching makes it easy for the devices to communicate beyond the networks.
  Layer 2 switches do simple switching as the table of the MAC addresses is found and maintained.    Layer 3 switches are specialized devices that are designed for routing data packets by using IP addresses.

 also, read simiservice.com

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