Cisco

Border Gateway Protocol (BGP) is the protocol that forms the internet network. BGP belongs to the Exterior Gateway Protocol (EGP) or can be said to be the only EGP protocol.

OSPF is a dynamic routing protocol that automatically manages and finds the best path to route data across computer networks.

EIGRP is a distance vector protocol and Cisco proprietary. It uses the DUAL (Diffusing Update Algorithm) algorithm.

Internet users are growing very rapidly so the available IPv4 space is also getting smaller. Moreover, with the number of devices such as phones and tablets that need internet connection also reduce IPv4 space. The solution is with IPv6 which has much more ip space.

Routing is sending packet data from one network to another network. The device used in routing is a router. A router is used for best path selection and packets forwarding.

Switches in Cisco are usually called catalysts. The most prominent difference between a switch and a router is that a switch has many ports.

A network is a collection of network devices and end devices connected to each other that can share information and resources.