Questions and Answers
Which port number is commonly used for FTP file transfer control data?
20
What is the main function of port 23 according to the text?
Terminal emulation (not secure)
For which protocol is port 143 typically used?
IMAP
What is the main utility of port 80 according to the text?
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Which port number is typically associated with Secure Shell (SSH)?
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What function is carried out through port number 445 according to the text?
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Study Notes
Port Numbers and Protocols
- FTP (File Transfer Protocol) uses port numbers 20 and 21 for file transfer control data and file data respectively.
- SSH (Secure Shell) uses port number 22 for encrypted terminal emulation.
- Telnet uses port number 23 for terminal emulation (not secure).
- SMTP (Simple Mail Transfer Protocol) uses port number 25 for outgoing email.
- HTTP (Hypertext Transfer Protocol) uses port number 80 for web pages (not secure).
- POP3 (Post Office Protocol 3) uses port number 110 for incoming email.
- IMAP (Internet Message Access Protocol) uses port number 143 for incoming email.
- HTTPS (HTTP Secure, HTTP over SSL) uses port number 443 for secure web pages.
- RDP (Remote Desktop Protocol) uses port number 3389 for remote desktop functionality.
Networking Protocols
- DNS (Domain Name System) uses port number 53 for allowing the use of DNS naming.
- DHCP (Dynamic Host Configuration Protocol) uses port numbers 67 and 68 for IP addressing provided by a DHCP server to a network client.
- NetBIOS/NetBT (NetBIOS over TCP/IP) uses port numbers 137-139 for enabling legacy (pre-TCP/IP) apps to run on TCP/IP networks.
- SNMP (Simple Network Management Protocol) uses port numbers 161 and 162 for remote management of network devices; SNMP manager and SNMP agent respectively.
- LDAP (Lightweight Directory Access Protocol) uses port number 389 for querying directories.
- SMB/CIFS (Server Message Block/Common Internet File System) uses port number 445 for Windows naming, folder sharing, and cross-platform file sharing.
