You need to create a firewall rule to allow telnet traffic to pass through. What port should you open in your firewall rule?
A) tcp/20
B) tcp/21
C) tcp/23
D) tcp/25
E) Just open them all; most people on the Internet are very, very honest.
The answer: C) tcp/23
The telnet protocol normally communicates over TCP port 23.
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Want to know more? Watch “Common Ports.”The fundamental languages used over our computer networks are a standard set of protocols that are used around the world. In this video, you’ll learn about protocols and the set of standards associated with TCP/IP. You’ll also learn the essentials of TCP/IP and how subnetting can be used to build today’s modern networks. |
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