What is a Router

 What is a Router

What is a Router, Functions of a router

A router is another network infrastructure device that directs packets through the network based on information from Network Layer (Layer 3) of OSI model. A router uses a combination of hardware and software to "route" data from its source to its destination. A router can be configured to route data packets from different network protocols, like TCP/IP (industry standard), IPX/SPX, and AppleTalk.

Routers segment large networks into logical segments called subnets. The division of the network is based on the Layer 3 addressing system, like IP addresses. If the Network Layer (Layer 3) Data packet (IP Datagram) is addressed to another device on the local subnet, the packet does not cross the router and create a traffic congestion problem in another network. If data is addressed to a computer outside the subnet, the router forwards the data to the addressed network. Thus routing of network data helps conserve network bandwidth. The following picture shows a Cisco 2800 Series Router.

Chapter 1 :- Introduction to Computer Networking

Chapter 2 :- What is a Computer Network

Chapter 3 :- Why we need computer networks 

Chapter 4 :- Client Operating Systems

Chapter 5 :- Common Network Application Software 

Chapter 6 :- LAN and WAN

Chapter 7 :- CAN and MAN 

Chapter 8 :- Peer-to-Peer networks and Client-Server networks

Chapter 9 :- Centralized and Distributed Computer Networks

Chapter 10 :- Internetworks, Internet, Intranet and Extranet

Chapter 11 :- What is a Network Protocol

Chapter 12 :- Difference between Proprietary and Standard Protocols

Chapter 13 :- What are RFCs

Chapter 14 :- Organizations which control Internet 

Chapter 15 :- Bus Topology

Chapter 16 :- Star Topology 

Chapter 17 :- Mesh, Ring and Hybrid Topologies

Chapter 18 :- Network Infrastructure Devices and Icons 

Chapter 19 :- Network Hub

Chapter 20 :- Network Bridge

Chapter 21 :- What is a Router 

Chapter 21 :- What is a Firewall

Chapter 22 :- Office Networks 

Chapter 23 :- Hub-and-spoke WAN topology

Chapter 24 :- Partial-Mesh WAN topology

Chapter 25 :- Full-mesh Site-to-site WAN topology 

Chapter 26 :- What is NIC 

Chapter 27 :- Common Network Cable types

Chapter 28 :- Difference between Baseband and Broadband

Chapter 29 :- CSMA/CD, CSMA/CA and Token Passing

Chapter 30 :- LAN Technologies Ethernet 

Chapter 31 :- Ethernet Media Standards 

Chapter 32 :- What is Token Ring 

Chapter 33 :- What is FDDI

Chapter 34 :- IEEE 802 Standards 

Networking Interview Questions :- 1

Networking Interview Questions :- 2

Networking Interview Questions :- 3

Networking Interview Questions :- 4