It specifies the protocol adopted by the traffic, or the types of traffic.
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TELNET: Telnet is a protocol that provides a command line interface for communication
with a remote device or server, sometimes employed for remote management but also
for initial device setup like network hardware.
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HTTP: Hypertext Transfer Protocol (HTTP) is an application protocol and the foundation
of data communication for the World Wide Web, where hypertext documents include
hyperlinks to other resources that the user can easily access.
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HTTPS: Hypertext Transfer Protocol Secure (HTTPS) is an extension of HTTP. SNMP is
used for secure communication over a computer network, and is widely used on the
Internet.
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PING: Ping is a computer network administration software utility used to test the
reachability of a host on an IP network.