ROUTER

• It is device to communicate between two different networks.

• It is process of sending the data packets through the best path to reach the destination.

• It gives exit point (or) entry point to reach the destination.

• Routes should be added manually on the router by the administrator.

• Routes will be added automatically by the router with the help of routing protocols

• It is a computer which performs routing task as one of its multiple tasks.

• It is Dedicated HARDWARE DEVICE which works only as a router.

• Routing and Remote Access is a service that performs routing as one of its multiple processes.

NAT:-

• Provides access to internet from a protected private address range.

• Translates Private IP’s to public IP’s & vice-versa for outgoing and incoming traffic

• Hide private IP address range from the internet

• Can be used with DHCP or can be configured to assign IP to Client

DHCP Relay Agents:-

• A DHCP Relay agent is a computer or router that listens for DHCP Broadcasts from DHCP client and then relay(sends) those messages to DHCP Server on the another network.

Network:-
             - A Network is an interconnection of devices
Networking:-
            - Networking is the communication between the interconnected devices

Types of Networks:-
Local Area Network(LAN)
                       - Operate within a limited geographical area
                       - Provides full-time connectivity to local services
Metropolitan Area Network (MAN)
                       - span with in city
                       - provides full time and part time connectivity
Wide Area Network(WAN)
                       - Operates over a large geographical area
                       - provides full time and part time connectivity
Network NIC Devices:-
NIC
                - The network interface card is frequently called as a NIC, It forms an interface between the network devices (computers) and the Ethernet (LAN)
HUB
               - It is generally used in to connect all devices all devices on a network so that they can communicate with each other. It always do broadcasting
Switch
               - Like HUB, It is also used to connect all devices on a network so that they can communicate with each other. But first time it will broadcast and from second time onwards it will do unicast.