Chapter 20. Understanding Protocols
Protocols provide the common language for devices to talk, and they also provide the rules for communicating. To put this into context, Chapter 18 covers devices such as routers, switches, and computers. Chapter 19 covers the different types of cables and how they connect the devices together. This chapter covers many of the common networking protocols.
Exam 220-801 objectives in this chapter:
2.3 Explain properties and characteristics of TCP/IP.
2.4 Explain common TCP and UDP ports, protocols, and their purpose.
21 – FTP
23 – TELNET
25 – SMTP
53 – DNS
80 – HTTP
110 – POP3
143 – IMAP
443 – HTTPS
3389 – RDP
TCP vs. UDP