Know Your Network Ports

Which of the following protocols operates over port 3389 by default?

• POP3

• SSH (Secure Shell)

• Telnet

• RDP (Remote Desk Protocol)

Which of the following ports are used by the NetBIOS protocol to share files and printers on a Windows network?

• 443

• 21

• 139

• 110

Which of the following ports needs to be opened on the firewall to ensure the phones can communicate with the TFTP server and download their boot-up configurations?

• 53

• 69

• 21

• 161

Which of the following ports is used for the request and distribution of DHCP configuration information?

• 80

• 67

• 53

• 162

What ports do FTP and SFTP utilize?

​ (a)  

• 20,21
• 21,23
• 21,22
• 22,23

Which of the following ports should you block at the firewall if you want to prevent a remote login to a server from occurring?

• 80

• 22

• 143

• 21

Answer explanation

If you want to prevent a remote login to a server, you should block port 22. Port 22 is used for SSH (Secure Shell), which is commonly used for secure remote logins to servers. Blocking this port would hinder an externally located individual's ability to log in to the server remotely

Which of the following ports are used for secure sessions? (Choose two.)

• 22

• 23

• 443

• 80

• 110

A technician needs to connect a user to a network share on the server. Which of the following ports should the technician allow through the firewall?

• 67

• 137

• 143

• 445

• 3389

SSH port number is

• 22

• 21

• 25

• 110

Answer explanation

The correct answer is 22 because SSH (Secure Shell) is a network protocol that allows secure remote login and file transfer. By default, SSH uses port number 22 for communication. This port number is standardized and widely recognized as the default port for SSH connections.

FTP port number is

• 22

• 21

• 53

• 25

Answer explanation

FTP (File Transfer Protocol) uses port number 21 to establish a connection between a client and a server for transferring files. This port is specifically designated for FTP communication.