CompTIA Security+ All-in-One Exam Guide (Exam SY0-301), 3rd Edition, 3rd Edition

Internet Protocols

To facilitate cross-vendor product communication, protocols have been adopted to standardize methods. The Internet brought several new protocols into existence, a few of which are commonly used in routing of information. Two protocols used at the transport layer are TCP and UDP, whereas IP is used at the network layer. In each session, one transport layer protocol and one network layer protocol is used, making the pairs TCP/IP and UDP/IP.

TCP

TCP is the primary transport protocol used on the Internet today, accounting for more than 80 percent of packets on the Internet.

TCP begins by establishing a virtual connection through a mechanism known as the TCP handshake. This handshake involves three signals: a SYN signal sent to ...