What is router and what does router do?
We are learn about router and Its functionality, types and advantages of using this device in the network at the most basic level. Around two connects two or more networks together or for two or more lands to be interconnected you need a device.
It is a layer 3 device because it operates at the layer 3 of the OSI model of communication. It uses IP addresses to the packets and is responsible for the path determination in addition to the connecting multiple networks together.
The router also allows network devices to communicate and multiple users to access the Internet. As the name implies it routes traffic between the devices and the internet or between devices on the other line. let’s see how it works to understand how this network device works let’s start with an example of how post office system works.
If a person wants to send a back postcard to Mr. ABC from Chicago to New York he needs to write the destination postal address of New York on the envelop if such a merabh gets to Chicago post-office. it is checked against the distinction postal address and forwarded to the meaning of post office the new York post office knows where to deliver the envelope based on destination postal address. Which is local to new york post inserting the post office example the functionality of a router is similar to the post office to understand.
How the router works we need to understand the process of routing routing refers to the process of taking a packet from one host and sending it to another host on different network.
It is usually done by the devices called routers around to is a device that joins network together and routes traffic between them.
A router will have at least two ports one physically connected to one network and other physically connected to another network but also can connect any number of networks together providing. It has dedicated ports for each Network every interface of the router is assigning unique layer tree address call as IP address the aim of IP address is very similar to postal address.
It look it’s the center and receiver within the network those IP addresses are saved on the router in a routing table which lists all possible paths in your network and a router receives IP packets that needs to be forwarded somewhere else in the network.
There have to look at the packet destination IP address and then searches for the routing information in the routing table let’s take a closer look into the routers. Routing and packet forwarding process device a sends the IP packet to device B which has address of 192 168 for a twenty such packet includes the destination IP address in packet header of device B routers have put or more precisely interfaces that are interfacing with other network devices and the visas connect the links that are used in packet forwarding and a packet is coming on our one on interface FA 0 / 1.
That is the ingress interface router analyzes the destination IP of the packet which is 192 168 4.3 and performs the lookup in its routing table. which has entries related to each known destination each routing entry stores destination address and address of the next device on the path called next hop device now having the next hop address router can determine the outgoing interface and sends the packet to router 2.
Which is accessible to interface FA 0 / 0 that is the egress interface the same process happens on every router along the path to the destination routers don’t just Suffolk to the other networks. They learn which are the fastest route and use them first next we will discuss the types of router starting with wired and Wi-Fi router usually connects directly to the modem or van wire network cable. They typically come with a port that connects two modems to communicate with the internet and distributes the data packet to the connected computer using other ports to the cable.
Cisco 1941 is one of the example of wires router II the next type of a wireless router connects directly to a modem to a cable for receiving Internet data packets and distributors replicate to the connected computer using one or more antenna. Wireless device can create a wireless signal in your home or office. So any PC within the Reno wireless routers can connect it and use your internet example of wireless routers or Cisco 880 ISR and ea 7500 the next edge router which is the route specialized route residing at the edge or boundary of a network.
This router ensures the connectivity of its network with external network a van or the Internet this type of router is placed at the edge of the isp Network edge routers inject classified traffic from the customer into the core and forward from the core to the customer Cisco is a 9000 series routers are one of the example of Cisco edge routers.
Next router is the core router this device is designed to operate in the Internet backbone or core core also provides transit packet forwarding service between other core and edge routers core routers forward stuff between the edges asked as fast as possible.
They tend to be optimized for high bandwidth those routers are used as service providers core routers. Cisco’s TRS carrier routing system is the example of core routers next up is virtual router.
It is a software that an enterprise or a cloud provider can deploy as a virtual machine in a provider hosted cloud or in its own virtual environment.
It delivers comprehensive and getaway and network services function into virtual and cloud and run man uses industries. It uses industry-leading Cisco wires XE software – examples of v router RCS are 1000 v which is supported across multiple hypervisors.
We embrace such as V-ware v sphere, Microsoft hyper-v, Amazon AWS and Microsoft Azure is our V router runs on a server platform running.
The Cisco and FBI utilization software only last will discuss about the advantages of using the routers in the network routers are used to segment large networks into inter networks made up of smaller networks that are easier to manage routers can connect different network architectures such as Ethernet and token ring routers can choose the best path across the network using dynamic routing techniques.
Routers reduce network traffic by creating broadcast domain all ports on an ultra in different broadcast domains and routers don’t forward broadcast from one broadcast domain to another