TCP/UDP Purpose
Used to transfer files to and from a server. Port 21.
What is FTP/File Transfer Protocol?
The standard for communication on the web, used to render pages into web browsers. Port 80.
What is HTTP/Hyper Text Transfer Protocol?
Used for Lan communication. Port 137-139
What is Network Basic Input Output System/NetBIOS/NetBT?
Used to access a directory on network objects. Port 389
What is Lightweight Directory Access Protocol/LDAP?
Used to access access remote devices with added encryption. Port 22.
What is SSH/Secure Shell?
Used for receiving Email. Email is downloaded from the server. You now have the copy of the email. Port 110.
What is POP3/Post Office Protocol 3?
Used for shared access on a network. Port 445
What is Server Message Block/Common Internet File System/SMB/CIFS
Used to send/receive network management messages. Ports 161/162
What is Simple Network Management Protocol/SNMP?
Used to access remote devices with no encryption. Port 23.
What is Telnet?
Used for receiving email. The server maintains the copy of the email. Port 143.
Used for Local Service Discovery. Port 427
A connection orientated protocol used to send/receive data over a network. Before data is sent, a connection is established with the receiving host. It is considered a reliable protocol because the receiving host acknowledges that it received the data. TCP is used in cases where receiving the proper data is more important that speed.
Used for sending email. Port 25
What is SMTP/Simple Mail transfer Protocol?
Secure communication on the web. Port 443.
What is HTTPS/Secure Hypertext Transfer Protocol?
Used for Apple File Services. Port 548
What is Apple Filing Protocol/AFP?
A connectionless protocol. Data is sent without any assurance that the receiving host is actually receiving the data. For that reason it is considered an unreliable protocol. The advantages of UDP over TCP is that it is faster.
Translates domain names to IP addresses. Port 53.
What is DNS/Domain Name Server?
Used to connect to remote computers. Port 3389.
What is RDP/Remote Desktop Protocol?
Used to assign IP address to Network Hosts. Ports 67/68
What is Dynamic Host Configuration Protocol/DHCP?