Networking on z/OS
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Network applications

Networking on z/OS

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Sitting above layer 4 are the applications. Applications can use either TCP or UDP to communicate. Because of its inherent reliability, TCP tends to be used more often.

Examples of applications running on z/OS using TCP include sendmail, web servers, FTP and telnet. Applications using UDP on z/OS are Traceroute, Enterprise Extender, and name servers (Domain Name System).

Tip: Enterprise Extender is really SNA encapsulated in a UDP datagram. At first, it appears odd that UDP and not TCP would be chosen to carry traffic as important as SNA traffic. However, the flow control and reliability capabilities of TCP are already built into SNA, so TCP is not required.
Parent topic: Network layers and protocols review
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