CISSP - Common Ports and Protocols

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Well Known Ports
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Terms in this set (24)
Well Known Ports
0-1023
Registered Software Ports
1024 - 49151
Random, Dynamic, or Ephemeral ports
49152-65535
Port 20 and 21 (TCP)
FTP (File Transfer Protocol) - This is a network application that
supports an exchange of files that requires anonymous or specific authentication.
Port 22
SSH (Secure Shell) - - A client server program that opens a secure, encrypted command-line shell session from the Internet for remote logon. Similar to a VPN, SSH uses strong cryptography to protect data, including password, binary files and administrative commands, transmitted between system on a network. SSH is typically implemented between two parties by validating each other's credential via digital certificates. SSH is useful in securing Telnet and FTP services, and is implemented at the application layer, as opposed to operating at network layer (IPSec Implementation)
Port 23 (TCP)
Telnet (Remote Login Service) - This is a terminal emulation network application that supports
remote connectivity for executing commands and running applications but does not support transfer of files.
Port 80 (TCP)
HTTP (Hypertext Transfer Protocol) - This is the protocol used to transmit
web page elements from a web server to web browsers.
Port 25 (TCP)
SMTP (Simple Mail Transfer Protocol) - This is a protocol used to transmit
email messages from a client to an email server and from one email server to another.
Port 69 (UDP)
TFTP (Trivial FIle Transfer Protocol) - This is a network application that
supports an exchange of files that does not require authentication.
Port 110 (TCP)
POP3 (Post Office Protocol) - This is a protocol used to pull email messages
from an inbox on an email server down to an email client.
Port 143 (TCP)IMAP (Internet Message Access Protocol) - This is a protocol used to pull email messages from an inbox on an email server down to an email client. IMAP is more secure than POP3 and offers the ability to pull headers down from the email server as well as to delete messages directly off the email server without having to download to the local client first.Port 67 and 68 (UDP)DHCP (Dynamic Host Configuration Protocol) - DHCP uses port 67 for server point-to-point response and port 68 for client request broadcasts. It is used to assign TCP/IP configuration settings to systems upon bootup. DHCP enables centralized control of network addressing.Port 443 (TCP)HTTPS/ SSL (Secure Sockets Layer for HTTP Encryption) - This is a VPN-like security protocol that operates at the Transport layer. SSL was originally designed to support secured web communications (HTTPS) but is capable of securing any Application layer protocol communications.Port 515 (TCP)LDP (Line Print Daemon)- This is a network service that is used to spool print jobs and to send print jobs to printers.Port 6000-6063 (TCP)X Windows - This is a GUI API for command-line operating systems.Port 2049 (TCP)NFS (Network File System) - This is a network service used to support file sharing between dissimilar systems.Port 161 and 162 (UPD)SNMP (Simple Network Management Protocol) - This is a network service used to collect network health and status information by polling monitoring devices from a central monitoring station.ARP (Address Resolution Protocol)A subprotocol of the TCP/IP protocol suite that operates at the Data Link layer (layer 2). ARP is used to discover the MAC address of a system by polling using its IP address.Reverse Address Resolution Protocol (RARP)A subprotocol of the TCP/IP protocol suite that operates at the Data Link layer (layer 2). RARP is used to discover the IP address of a system by polling using its MAC address.Integrated Services Digital Network (ISDN)A digital end‐to‐end communications mechanism. ISDN was developed by telephone companies to support high‐speed digital communications over the same equipment and infrastructure that is used to carry voice communications.Point‐to‐Point Tunneling Protocol (PPTP)An enhancement of PPP that creates encrypted tunnels between communication endpoints. PPTP is used on VPNs but is often replaced by L2TP.Serial Line Internet Protocol (SLIP)An older technology developed to support TCP/IP communications over asynchronous serial connections, such as serial cables or modem dialup.Network Address Translation (NAT)A mechanism for converting the internal private IP addresses found in packet headers into public IP addresses for transmission over the Internet.Simple Key Management for IP (SKIP)An encryption tool used to protect sessionless datagram protocols.