2.0 Networking

FTP

• TCP 20 (data transfer), TCP 21 (control/commands)

• File exchange/management/transfer

SSH

• TCP 23

• SFTP

• Secure remote login and file transfer, provides encrypted communication between client and server

Telnet

• TCP 23

• Allows for remote access and login between client and server. also allows file transfer

• Not secure

SMTP

• TCP 25

• Sends emails

DNS

• UDP 53

• Resolves host names to IP addresses

DHCP

• UDP 67 (server), UDP 68 (client)

• Assigns IP addresses to network users

HTTP

• TCP 80

• Transmits webpages

  • Manages communications between web servers and client to view internet conent

• Not secure

POP3

• TCP 110

• Downloads incoming emails

NETBIOS/NetBT

• UDP 137 (usually for older machines), TCP 139'

• API communication (data transfers) between computers on the same network

• Includes features like name resolution, printer sharing, etc.

• CIFS/SMB refereed to as NETBIOS-less since they share similar features

IMAP

• TCP 143

• Downloads and syncs mail to client devices

SNMP

• UDP 161 (Queries/sending/receiving requests, server), UDP 162