Networking, Addressing, and Communication Lesson 009: Ports and Protocols Part 1

Why is it important to know and memorize some ports and protocols?

In order to be ready to configure and troubleshoot networks and its devices

What ports category do all of the listed ports in this section come from?

The registered port range.

What does FTP stand for?

File Transfer Protocol.

What port/s does FTP operate on?

20 and 21.

What is FTP used for?

Transferring files between a client and a server.

Port 20

Used for sending and receiving data.

Port 21

Used as the control channel for FTP.

Why should one not use FTP for transmitting sensitive data?

It transmits data using plain text.

What is the exception for not using FTP when transmitting sensitive data?

When tunneling the data through a secure connection.

What does SSH stand for?

Secure Shell.

What does SSH do?

Provides secure, encrypted access to a remote computer.

What port/s does SSH use?

Port 22.

What is the most common use case for SSH?

For managing servers using a command line interface.

Why is SSH used for managing servers?

Ensures that data and login credentials are protected from eavesdropping.

What port/s does Telnet operate on?

Port 23.

What does Telnet do?

Allows remote access to a computer using a text-based interface.

What is Telnet similar to?

SSH.

What is the important difference between Telnet and SSH?

Telnet is insecure due to data and passwords being transmitted in plaintext.

Which network protocol that uses port 23 should never be used?

Telnet.

If Telnet is considered insecure and obsolete, why is it important to know about it?

To be able to recognize it and fix the security concerns that come with it.

What does SMTP stand for?

Simple Mail Transfer Protocol.

What port/s does SMTP use?

Port 25.

What is SMTP used for?

Sending email messages.

How long has SMTP been an active standard

Since the 1980s.

What is the current standard for outgoing emails?

SMTP.