SYO-601 Ports

67/68

This network management protocol is used to assign local IP addresses to devices on a network. It is used to create multiple private IP addresses from one public IPv4 address.

88

Network authentication protocol that allows for communication over a non-secure network.

Post Office Protocol - 110

E-mail protocol that allows e-mail clients to communicate with e-mail servers. POP provides only one-way communication.

Internet Message Access Protocol - 143, 993

E-mail protocol used by e-mail clients to communicate with e-mail servers. Provides two way communication unlike POP.

Simple Network Management Protocol 161/162

Protocol used to monitor and manage network devices on IP networks.

Lightweight Directory Access Protocol - 389

Used to manage and communicate with directories.

Lightweight Directory Access Protocol Secure - 636

Secure version of LDAP that uses TLS for encryption.

File Transfer Protocol Secure - 989/990

FTPS uses TLS for encryption. It can run on ports 20/21 but is sometimes allocated to ports 989/990.

Internet Message Access Protocol Secure - 993

Secure version of IMAP that uses TLS for encryption.

Post Office Protocol 3 Secure - 995

Secure version of POP that uses TLS for encryption.

Remote Authentication Dial-In User Service - 1812/1813

Used to provide AAA for network services

3868

Developed as an upgrade to Radius

Secure Real Time Protocol - 5004

SRTP replaced RTP and is a protocol used to stream audio and video communication using UDP.

Layer 2 Tunneling Protocol - 1701

Session Layer

Used to create point to point connections, like VPNs over a UDP connection. Needs IPSec for encryption. Designed as an extension to PPTP. Operates at the data link layer but encapsulates packets at the session layer.

Transmission Control Protocol

One of two main protocols of the Internet Protocol (IP) suite used to transmit data over an IP network. TCP provides error checking to ensure packets are not lost in transit.

User Datagram Protocol

The second main protocol in the IP suite that transmits datagrams in a best effort method. UDP does not include error checking.

Point to Point Tunneling Protocol - 1723

Based on PPP. Deprecated protocol for VPNs.

Remote Desktop Protocol - 3389

Windows proprietary protocol that provides a remote connection between two computers.

IPsec

TLS

L2TP

Spanning Tree Protocol

Rapid Spanning Tree Protocol

Prevent against broadcast storms