Understanding TCP IPThis book is a primer on TCP IP. Understanding the computer network as an engineer in the Internet world is now essential and knowledge of TCP IP is essential to study computer networks. Part01 introduces basic concepts of data communication and network to help understanding TCP IP protocol, and introduces basic knowledge of the Internet and protocol semantics and network model. In Part02, we cover the network interface layer, which is the lower layer of the TCP IP protocol, which is the basics of computer networks.In Part03, the network layer, also called the Internet layer, Will be described. IP protocol, ARP and RARP, ICMP, and IGMP protocols. In Part04, we describe the unicast routing protocol and the multicast routing protocol, which should select the optimal route when deciding on which network to send the packet to when the router receives the packet. In the transport layer covered in Part 05, two protocols, TCP and UDP, are defined. Part06 introduces several application protocols that are most closely related to Internet users, also called applications.