Security+ TCP vs UDP

FTP

TCP - Port 21 is the control port while port 20 is used to transfer files

SSH

TCP - Designed to transmit data through a remote connection

SFTP

TCP - A completely separate protocol from FTP (it is not compliant with FTP servers) that uses SSH to encrypt file transfers

SMTP

TCP - Internet mail protocol used to send outgoing mail from email clients to mail servers

TACACS+

TCP - Cisco proprietary protocol used for authentication, authorization, and accounting (AAA) services

DNS

UDP - Used to associate IP addresses with domain names

DHCP

UDP - This network management protocol is used to assign multiple local private IP addresses from one public IPv4 address

HTTP

TCP - Protocol used for websites and most internet traffic

Kerberos

TCP/UDP - Network authentication protocol that allows for communication over a non-secure network.  Primarily uses UDP but can use TCP

POP

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

NTP

UDP - Low latency protocol used to synchronize timekeeping across a network

SMB

UDP - Windows proprietary protocol built on NetBIOS.  Allows users to remotely access servers.  Originally used port 139 over UDP

IMAP

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

SNMP

UDP - Protocol used to monitor and manage network devices on IP networks

LDAP

UDP - Used to manage and communicate with directories

HTTPS

TCP - Secure version of HTTP that used TLS for encryption.  Most websites use HTTPS instead of HTTP

SSTP

TCP - Microsoft developed SSTP technology to replace the more insecure PPTP or L2TP/IPSec options available in Windows.  SSTP uses TLS

IPSec

UDP - Internet Protocol security achieved through the use of ISAKMP – Internet Security Association and Key Management Protocol

SMTPS

TCP - The secure version of SMTP.  Uses TLS for encryption

LDAPS

TCP - Secure version of LDAP that uses TLS for encryption

POP3S

TCP - Secure version of POP that uses TLS for encryption

RADIUS

UDP - Used to provide AAA for network services

Diameter

TCP - Developed as an upgrade to Radius

SRTP

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

RDP

TCP - This Windows proprietary protocol that enables remote connections to other computers

IMAPS

TCP - Secure version of IMAP that uses TLS for encryption

FTPS

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

SMB (modern)

TCP - Windows proprietary protocol built on NetBIOS.  Allows users to remotely access servers.  Modern versions use port 445 and TCP