Application Protocal
UDP PORTS

Kerberos.

uses UDP port 88

Authentication protocol used in Windows domains and some Unix environments.

(SNMP) Simple Network Management Protocol

Trivial File Transfer Protocol (TFTP)

Transfer smaller amounts of data, such as when communicating with network devices.

Many attacks have used TFTP

UDP port 69

Not an essential protocol on most networks

UDP port 161

Send notifications & Error mesgs
known as traps (sometimes called device traps)

manages network devices

SNMPv2 and SNMPv3 are much more secure

(NetBIOS) Network Basic Input/Output System

TCP port 139. It can use TCP port 137, but rarely does.

UDP ports 137 and 138

allows applications on different computers to communicate within a local area network (LAN).

(RDP) Administrators and clients use Remote Desktop Protocol

UDP 3389 or TCP 3389

To connect to other systems from remote locations