Common Ports - CompTIA A+ 220-1201 - 2.1

Tcp/20 (active mode data)

Tcp/21 (control)

What port numbers are commonly associated with FTP (File Transfer Protocol).

FTP (File Transfer Protocol)

- Transfers files between systems

- Authenticates with a username and password

- Has full-featured functionality

Tcp(22)

What port number is associated with SSH (Secure Shell)

SSH (Secure Shell)

- An encryption communication link

- Looks and acts the same as Telnet

Tcp/23

What port number is associated with Telnet

Telnet

- A telecommunication network

- Can login to devices remotely

- Has In-the-clear communication and not best choice for production systems

Tcp/25

What port number is associated with SMTP (Simple Mail Transfer Protocol)

SMTP (Simple Mail Transfer Protocol)

- Used to send mail from a device to a mail server

- Commonly configured on mobile devices and email

Udp/53

What port number is associated with DNS (Domain Name System)

DNS (Domain Name System)

Converts names to IP addresses

Udp/67

Udp/68

What port numbers are commonly associated with DHCP (Dynamic Host Configuration Protocol)

DHCP (Dynamic Host Configuration Protocol)

- An automated configuration of IP address, subnet mask, and other options

Tcp/80

What port number is associated with HTTP (Hypertext Transfer Protocol)

Tcp/443

What port number is associated with HTTPS (Hypertext Transfer Protocol Secure)

HTTP (Hypertext Transfer Protocol) and HTTPS (Hypertext Transfer Protocol Secure)

- The communication protocol in the browser

- Supported by nearly all web servers and clients

Tcp/110

What port number is associated with POP3 (Post Office Protocol Version 3)

Tcp(143)

What port number is associated with IMAP4 (Internet Message Access Protocol V4)

POP3 (Post Office Protocol Version 3)

The basic mail transfer functionality

IMAP4 (Internet Message Access Protocol V4)

Includes management of email inbox from multiple clients

SMB (Server Message Block)

- Protocol used by Microsoft Windows for file sharing and printer sharing

- Also called CIFS (Common Internet File System)

Udp/137

What is the port number associated with NetBIOS name services (nbname)

Tcp/139

What is the port number associated with NetBIOS session services (nbsession)

Tcp/445

What is the port number associated with NetBIOS-less

Tcp/389

What is the port number associated with LDAP/ LDAPS

Tcp/3389

What is the port number associated with RDP (Remote Desktop Protocol)