CompTIA Security+ (SY0-701) Ports and Protocols

FTP (File Transfer Protocol)

TCP 21

Used to transfer files from host to host

SSH (Secure Shell)

TCP 22

Provides secure remote terminal access and file transfer capabilities

SCP (Secure Copy Protocol)

TCP 22

Provices secure copy functions

SFTP (Secure File Transfer Protocol)

TCP 22

Provides secure file transfers

Telnet

TCP 23

Provides insecure remote control of another machine using a text-based environment

SMTP (Simple Mail Transfer Protocol)

TCP 25

Provides the ability to send emails over the network

DNS (Domain Name System)

TCP/UDP 53

Translates domain names into IP addresses

TFTP (Trivial File Transfer Protocol)

UDP 69

Used as a lightweight file transfer method for sending configuration files or network booting of an operating system

HTTP (Hypertext Transfer Protocol)

TCP 80

Used for insecure web browsing

Kerberos

UDP 88

Network authentication protocol

POP3 (Post Office Protocol Version Three)

TCP 110

Responsible for retrieving email from a server

NNTP (Network News Transfer Protocol)

TCP 119

Used for accessing newsgroups

RPC (Remote Procedure Call)

TCP/UDP 135

Facilitates communication between different system processes

NetBIOS

TCP/UDP 137/138/139

Networking protocol suite

IMAP (Internet Message Access Protocol)

TCP 143

Allows access to email messages on a server

SNMP (Simple Network Management Protocol)

UDP 161

Manages network devices

SNMP Trap

UDP 162

Responsible for sending SNMP trap messages

LDAP (Lightweight Directory Access Protocol)

TCP 389

Facilitates directory services

HTTPS (HTTP Secure)

TCP 443

Provides secure web communication

SMB (Server Message Block)

TCP 445

Used for file and printer sharing over a network

SMTPS (SMTP Secure)

TCP 465/587

Provides secure SMTP communication

Syslog

UDP 514

Used for sending log messages

LDAPS (LDAP Secure)

TCP 636

LDAP communication over SSL/TLS

IMAPS (Internet Message Access Protocol over SSL/TLS)

TCP 993

Used for secure email retrieval

POP3S (Post Office Protocol version 3 over SSL/TLS)

TCP 994

Used for secure email retrieval

Microsoft SQL

TCP 1433

Used to facilitate communication with Microsoft SQL Server

RADIUS TCP

TCP 1645/1646

Used for remote authentication, authorization, and accounting

RADIUS UDP

UDP 1812/1813

Used for authentication and accounting as defined by the Internet Engineering Task Force (IETF)

RDP (Remote Desktop Protocol)

TCP 3389

Enables remote desktop access

Syslog TLS

TCP 6514

Used in a secure syslog that uses SSL/TLS to encrypt the IP packets using a certificate before sending them across the IP network to the syslog collector