Network segmentation (part2): LAN segmentation

Network segmentation (part2): LAN segmentation

How it works

A LAN without any network segments is a single broadcast and collision domain.
In a broadcast domain, a group of devices on a network hears all the broadcasts that are sent on that network segment. This may cause unnecessary traffic on the LAN.
A collision domain, on the other hand, can be defined as a network scenario where one device sends a packet on a network segment and forcing other devices on the network segment to pay attention to the packet sent, thus causing collision by causing other devices on the network to transmit the data at the same time.

When a network has too many network hosts, the traffic congestion becomes a problem because too many packets are transmitted on a network. The performance of the network may degrade to an extent that no packet is delivered. To avoid network traffic congestion, a large network is usually broken into small network segments. The breaking of a network into smaller network segments is called subnetting.

Subnetting or Segmenting a LAN improves its performance. Consider a single department has more traffic than the other two departments in an office.
In such a scenario, entire traffic meant for different departments move on the same network and would cause network congestion and reduced performance.
If the same LAN is segmented for different departments then the performance would increase as the unnecessary traffic would not move on each network segment.

Segmentation also allows you to isolate network problems, improve network performance,
 solve network congestion issues, and maximize the available bandwidth. In addition,
the segmentation allows hardware and software failures to restrict to a network segment instead of affecting the entire network.

Once a LAN is segmented, the distances are no longer limitations because each segment can be created with maximum distance for a specific Ethernet type.
With segments the collisions and latency is also decreased, throughput is improved and bandwidth per user is increased.

Segmenting a Network

The segmenting of a network is possible only through network devices such as switches, routers, and bridges.

Bridge

The bridges just send all the data to all the computers connected to it, but they have just one source and one destination to deliver data packets.

•  A bridge has two interface devices. It receives data from one interface and delivers it to the other interface, it is connected to.
• A bridge creates two collision domains.
•  A bridge is also called an intelligent hub because it considers the destination of data before delivering it.
• Bridges are mainly used to break the collision domains and filter frames on the basis of layer 2 fields. 
• The bridges can be programmed to reject frames from a particular source and may help you to get rid of unnecessary broadcast and multicast packets.

    Switch

- Just like bridges, the switches are also data link layer devices that allow multiple LAN segments to be interconnected into a single larger network. they performed on hardware instead of in software and therefore much faster than routers that perform on software. moreover forward and flood traffic based on MAC addresses. Switches learn the MAC address of the requester and the port or the location of the device which responded to the request, almost instantly.
The first time, a request received by a switch is sent to all the computers connected to it. However, as soon as the request is responded by a computer, the switch learns the network location of the port that responded to the request and the MAC address of the source computer to handle the similar subsequent requests.

-Switches create address tables to handle network traffic. They have the capability to intelligently monitor the network traffic. Switches can provide nonblocking service, which allows multiple conversations between two ports to occur simultaneously.

-Switches can also be used to create VLANs or virtual workgroups by allowing you to create virtual segments instead of physically segmenting the network.
VLANs logically break a LAN in such a way that each segment is a separate Layer 2 broadcast domain.
The packets in a VLAN are switched only between the ports that are a part of the same VLAN.




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