CompTIA A+ 1101 Networking Services and Protocols 1

SMTP (Simple Mail Transfer Protocol)

- server to server email transfer
- also used to send mail to a mail server
- commonly configured on mobile devices and email services

POP3 (Post Office Protocol Version 3)

- basic mail transfer functionality
- retrieves emails from an email server

IMAP4 (Internet Message Access Protocol Version 4)

- includes management of an email inbox, from multiple clients
- like POP3, retrieves emails from an email server

SMB (Server Message Block) and CIFS (Common Internet File System)

- used by Microsoft Windows for file sharing and printer sharing
- used on most modern Windows machines
- can use NetBIOS over udp/137 through udp 139

SMNP (Simple Network Management Protocol)

- gathers statistics from network devices

v1:
- structured tables
- not encrypted

v2:
- data type enhancements
- bulk transfers
- not encrypted

v3:
- message integrity
- authentication
- encryption

FTP (File Transfer Protocol)

- transfers files between systems
- commonly requires authentication with a username and password
- contains file management functions

SSH (Secure Shell)

- provides a remote connection to a terminal device
- text based front-end
- encrypted connection

Telnet (Telecommunication Network)

- provides remote console access
- not encrypted

DNS (Domain Name System)

- converts names to IP addresses
- lookup using "dig [website name]" or "nslookup [website name]" in command prompt
- configure using a text-based file, or a web-based front-end

DHCP (Dynamic Host Configuration Protocol)

- automated configuration of IP address, subnet mask, and other options
- assigns IP addresses in real-time from a pool
- utilizes a lease system
- can configure and utilize DHCP reservation

HTTP (Hypertext Transfer Protocol) and HTTPS (Hypertext Transfer Protocol Secure)

- communication in the browser, and by other applications
- supported by nearly all web servers and clients
- HTTP is unencrypted, while HTTPS is encrypted

LDAP (Lightweight Directory Access Protocol)

- stores and retrieves information in a network directory
- commonly used in Microsoft Active Directory

RDP (Remote Desktop Protocol)

- shares a desktop from a remote location
- can connect to the entire desktop, or just an application
- Windows only