|  |  | Overview
Now that you have learned about the router configuration process, it's time to learn about the Transmission Control Protocol/Internet Protocol (TCP/IP). In this chapter, you will learn about TCP/IP operation to ensure communication across any set of interconnected networks. In addition, you will learn about the TCP/IP protocol stack components such as protocols to support file transfer, e-mail, remote login, and other applications. In addition, you will learn about reliable and unreliable transport layer protocols and you will learn about connectionless datagram (packet) delivery at the network layer. Lastly, you will learn how ICMP provides control and message functions at the network layer and how ARP and RARP work.