Cyberkraft Security+ 701 Ports and Protocols Reference Sheet

Complete reference of network ports, protocols, and their uses as specified in the Cyberkraft Security+ 701 study material.

File Transfer Protocol (FTP)

Uses TCP ports $20$ and $21$. Port $21$ is the control port while port $20$ is used to transfer files.

Secure Shell (SSH)

Runs on TCP port $22$. It is designed to transmit data through a remote connection.

SSH File Transfer Protocol (SFTP)

Uses TCP port $22$. It is a completely separate protocol from FTP (not compliant with FTP servers) that uses SSH to encrypt file transfers.

Simple Mail Transfer Protocol (SMTP)

Runs on TCP port $25$. This Internet mail protocol is used to send outgoing mail from email clients to mail servers.

TACACS+ (Terminal Access Controller Access-Control System Plus)

Uses TCP port $49$. It is a Cisco proprietary protocol used for authentication, authorization, and accounting (AAA) services.

Domain Name System (DNS)

Runs on UDP port $53$. It is used to associate IP addresses with domain names.

Dynamic Host Configuration Protocol (DHCP)

Uses UDP ports $67$ and $68$. This network management protocol is used to assign multiple local private IP addresses from one public IPv4 address.

Hypertext Transfer Protocol (HTTP)

Runs on TCP port $80$. This protocol is used for websites and most internet traffic.

Kerberos

Uses TCP or UDP port $88$, though it primarily uses UDP. It is a network authentication protocol that allows for communication over a non-secure network.

Post Office Protocol (POP)

Runs on TCP port $110$. This E-mail protocol allows communications between clients and servers in a one-way manner.

Network Time Protocol (NTP)

Runs on UDP port $123$. It is a low latency protocol used to synchronize timekeeping across a network.

Server Message Block (SMB) - Original

Originally used UDP port $139$. It is a Windows proprietary protocol built on NetBIOS that allows users to remotely access servers.

Internet Message Access Protocol (IMAP)

Uses TCP port $143$. This e-mail protocol provides two-way communication between e-mail clients and e-mail servers.

Simple Network Management Protocol (SNMP)

Runs on UDP ports $161$ and $162$. It is used to monitor and manage network devices on IP networks.

Lightweight Directory Access Protocol (LDAP)

Uses UDP port $389$. It is used to manage and communicate with directories.

Hypertext Transfer Protocol Secure (HTTPS)

Uses TCP port $443$. It is a secure version of HTTP that uses TLS for encryption.

Secure Socket Tunneling Protocol (SSTP)

Uses TCP port $443$. Developed by Microsoft to replace insecure PPTP or L2TP/IPSec options in Windows; it uses TLS.

Server Message Block (SMB) - Modern

Modern versions use TCP port $445$. It is a Windows proprietary protocol built on NetBIOS allowing remote server access.

Internet Protocol Security (IPSec) using ISAKMP

Uses UDP port $500$. Achieved through the use of ISAKMP (Internet Security Association and Key Management Protocol).

Simple Mail Transfer Protocol Secure (SMTPS)

Runs on TCP port $587$. This is the secure version of SMTP and uses TLS for encryption.

Lightweight Directory Access Protocol Secure (LDAPS)

Uses TCP port $636$. It is the secure version of LDAP that uses TLS for encryption.

File Transfer Protocol Secure (FTPS)

Uses TCP ports $989$ and $990$. It uses TLS for encryption and can also run on ports $20$ and $21$.

Internet Message Access Protocol Secure (IMAPS)

Uses TCP port $993$. It is the secure version of IMAP that uses TLS for encryption.

Post Office Protocol 3 Secure (POP3S)

Runs on TCP port $995$. It is the secure version of POP that uses TLS for encryption.

Remote Authentication Dial-In User Service (RADIUS)

Uses UDP ports $1812$ and $1813$. It provides AAA for network services.

Remote Desktop Protocol (RDP)

Uses TCP port $3389$. This Windows proprietary protocol enables remote connections to other computers.

Diameter

Uses TCP port $3868$. It was developed as an upgrade to RADIUS.

Secure Real Time Protocol (SRTP)

Uses UDP port $5004$. It replaced RTP and is used to stream audio and video communication.

Transmission Control Protocol (TCP)

A Layer $4$ Transport protocol that provides error checking to ensure packets are not lost in transit.

User Datagram Protocol (UDP)

A Layer $4$ Transport protocol that transmits datagrams in a best effort method without error checking.

Point to Point Tunneling Protocol (PPTP)

Uses TCP or UDP port $1723$. It is based on PPP and is a deprecated protocol for VPNs.

Layer 2 Tunneling Protocol (L2TP)

Uses UDP port $1701$. Used for point-to-point connections like VPNs; needs IPSec for encryption and operates at the data link layer while encapsulating packets at the session layer.