Routers

Router—What Is It?

Routers are basically devices that smoothly forward packets of data along networks. Simply stated, routers are designed to capture information that is received via a broadband connection through a modem and then it is delivered to your PC. Routers choose routes for data packets, helping you receive information. These are multi-port devices. They are considered better than bridges and repeaters.

Besides forwarding data packets, routers also support encapsulation and filtering just like bridges. They also operate at data link, physical and network layer of OSI model. Another thing that is common between bridges and routers is that they are both self-learning. Routers smoothly communicate their existence to other devices and also have the ability to about the existence of new routers, LAN segments and nodes.

They have access to logical/layer addresses which have routing tables that help it make decisions related to the route and which path to choose for a particular transmission/configure between the 2 hosts. Here, it is important to understand that routing tables are not stable. They are dynamic and updated quickly using routing-protocols.

Routers & routing products can easily transform your IT network and can deliver both high-security as well as reliable service to data centres, campuses and branch networks. Routers are situated at gateways, where 2 or more networks are connected such as either 2 WANs or LANs or sometimes LAN to ISP network.

Router—How It Works?

A router receives data packets from 1 connected network and then quickly passes to the second network that is connected to it. However, if a received packet comprises of the node address which is present on another network that the router is not part of, then the router basically chooses which one of the networks connected is the best relay point for data packets. Once the route/network is selected, the router passes the data packets along the selected network to the other router. Then that router checks and verifies the destination address and seeks for the best route for the data packet to transmit and then passes it to the destination network.

Routers—Different Types

There are many types of routers available in the market. Let’s take a look at some of the most commonly used routers:

Broadband Router

Broadband routers usually are used to interlink or connect computers or the internet. In other words, if you connect the internet using your phone or VOIP, then you will need a broadband router. Broadband routers are special types of modems that have both phone jacks and Ethernet.

Wireless Router

As the name suggests a wireless router helps create a wireless signal in the office or at home. Any PC that is within the range of the wireless router can connect and access the internet connection. Therefore, to avoid random people from using your internet connection, it is advisable to use a password and also get your IP address.

Subscriber Edge Router

The subscriber edge router belongs to the end user, enterprise organisation. The subscriber edge router is configured with broadcast external BGP to the provider AS.

Edge Router

The edge router is placed at the ISP network’s edge and configured to Border Gateway Protocol (BGP) to another Border Gateway Protocol of another ISP.

Core Router

Instead of the periphery, this type of router resided in the middle of the LAN network which is why it is called the core or the backbone router. It interconnects routers from different buildings of the campus through LAN or large enterprise location. The core router is optimised for high bandwidth.

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