What is Router?

  What is Router?

In CCNA, a router is a network device that forwards data packets between different computer networks. Routers are essential for connecting local networks (like your home network) to the internet and for enabling communication between different networks within an organization.

 

Key functions of a router:

·         Routing:

Routers use a routing table to determine the best path for data packets to travel across a network. 

·         Network Connectivity:

They connect different networks and allow devices on one network to communicate with devices on another. 

·         Traffic Management:

Routers manage and direct network traffic, ensuring efficient and reliable data transmission. 

·         Security:

Routers can also provide basic security features like firewall protection. 

 

NOTE: - A router is most commonly an OSI Layer 3 device, since its forwarding decision is based on the information of the OSI Layer 3 – the destination IP address. Routers divide broadcast domains, provide full duplex communication, and have traffic filtering capabilities

How does a router work?

Routers guide and direct network data, using packets that contain various kinds of data—such as files, communications, and simple transmissions like web interactions.

The data packets have several layers, or sections, one of which carries identifying information such as sender, data type, size, and most importantly, the destination IP (Internet protocol) address. The router reads this layer, prioritizes the data, and chooses the best route to use for each transmission

Without routers, we wouldn't be able to use the Internet to collaborate, communicate, or gather information and learn. 

       Routers can also provide security. Embedded firewall and content filtering software provide an additional protection from unwanted content and malicious websites without affecting your online experience.

       A router isn't just for data transmission or Internet connections, though. Most routers allow you to connect hard drives and use them as file-sharing servers, or printers that can then be accessed by anyone on the network

Types of routers

Core router

Core routers are generally used by service providers (i.e. AT&T, Verizon, Vodafone) or cloud providers (i.e. Google, Amazon, Microsoft). They provide maximum bandwidth to connect additional routers or switches. Most small businesses will not need core routers. But very large enterprises that have many employees working in various buildings or locations may use core routers as part of their network architecture.

Edge router

An edge router, also called a gateway router or just "gateway" for short, is a network's outermost point of connection with external networks, including the Internet.

Edge routers are optimized for bandwidth and designed to connect to other routers to distribute data to end users. Edge routers don't usually offer Wi-Fi or the ability to manage local networks fully. They typically have only Ethernet ports—an input to connect to the Internet and several outputs to connect additional routers.

Distribution router

A distribution router, or interior router, receives data from the edge router (or gateway) via a wired connection and sends it on to end users, typically via Wi-Fi, though the router usually also includes physical (Ethernet) connections for connecting users or additional routers.

Wireless router

Wireless routers, or residential gateways, combine the functions of edge routers and distribution routers. These are commonplace routers for home networks and Internet access.

Most service providers provide full-featured wireless routers as standard equipment. But even if you have the option to use an ISP’s wireless router in your small business, you may want to use a business-level router to take advantage of better wireless performance, more connectivity controls, and security.

Virtual router

Virtual routers are pieces of software that allow some router functions to be virtualized in the cloud and delivered as a service. These routers are ideal for large businesses with complex network needs. They offer flexibility, easy scalability, and a lower entry cost. Another benefit of virtual routers is reduced management of local network hardware.
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