Port Numbers

What is the purpose of Port 3389:

• File Transfer Protocol (FTP) connections

• Simple Mail Transfer Protocol (SMTP) connections

• Hypertext Transfer Protocol (HTTP) connections

• Remote Desktop Protocol (RDP) connections

Answer explanation

Port 3389 is used for Remote Desktop Protocol (RDP) connections, allowing users to remotely access and control a computer over a network.

What is the purpose of Port 137/139:

• File and print sharing in Windows networks (NetBIOS/NetBT)

• Network Time Protocol (NTP) communication

• Web browsing

• Email communication

Answer explanation

Port 137/139 is used for file and print sharing in Windows networks (NetBIOS/NetBT), allowing devices to communicate and share resources within the network.

What is the purpose of Port 445:

• File sharing (SMB/CIFS)

• Database management

• Email communication

• Web browsing

Answer explanation

Port 445 is used for File sharing (SMB/CIFS) purposes, allowing for sharing files and resources over a network using the Server Message Block (SMB) protocol.

What is the purpose of Port 443:

• File Transfer Protocol (FTP) communication

• Simple Mail Transfer Protocol (SMTP) communication

• Domain Name System (DNS) resolution

• Secure HTTP (HTTPS) communication

Answer explanation

Port 443 is used for Secure HTTP (HTTPS) communication, providing a secure way to transfer data over the internet.

What is the purpose of Port 22:

• FTP (File Transfer Protocol)

• HTTP (Hypertext Transfer Protocol)

• SMTP (Simple Mail Transfer Protocol)

• SSH (Secure Shell) protocol)

Answer explanation

Port 22 is used for SSH (Secure Shell) protocol, which provides secure access to a remote computer. It is not used for FTP, HTTP, or SMTP.

What is the purpose of Port 21/21:

• FTP data transfer

• SMTP data transfer

• Telnet data transfer

• SSH data transfer

Answer explanation

Port 21 is used for FTP data transfer, allowing files to be transferred between a client and server using the File Transfer Protocol.

What is the purpose of Port 25:

• FTP (File Transfer Protocol) communication

• SMTP (Simple Mail Transfer Protocol) communication

• SSH (Secure Shell) communication

• DNS (Domain Name System) resolution

Answer explanation

Port 25 is used for SMTP (Simple Mail Transfer Protocol) communication, allowing for the transfer of emails between servers.

What is the purpose of Port 53:

• Remote Desktop Protocol (RDP) communication

• Network Time Protocol (NTP) communication

• Domain Name System (DNS) resolution

• Secure HTTP (HTTPS) communication

Answer explanation

Port 53 is used for Domain Name System (DNS) resolution, allowing devices to translate domain names into IP addresses.

What is the purpose of Port 80:

• Secure HTTP (HTTPS) communication

• Hypertext Transfer Protocol (HTTP) communication

• Simple Mail Transfer Protocol (SMTP) communication

• File Transfer Protocol (FTP) communication

Answer explanation

Port 80 is used for Hypertext Transfer Protocol (HTTP) communication, allowing for web browsing and data transfer over the internet.

What is the purpose of Port 23:

• Telnet protocol for unencrypted text communication

• Secure Shell (SSH) encrypted communication

• Simple Mail Transfer Protocol (SMTP) communication

• Domain Name System (DNS) resolution

Answer explanation

Port 23 is used for the Telnet protocol, which allows unencrypted text communication. It is not used for SSH, SMTP, or DNS.