Application Protocols and Layers

FacebookTwitterGoogle+LinkedInEmail
Description

Application Layer

  • Web Services
    • HTTP
      • Hyper Text Transfer Protocol
      • Supports web services
      • Uses port number 80
      • The secure version is HTTPS
      • HTTPS uses port number 443
      • Transfers text, images, and hyper links
    • HTTPS
  • File Sharing Services/File transfer
    • FTP
      • File Transfer Protocol
      • Uses port number 21
      • Built=in in MS Windows Operating Systems
      • Many 3rd party programs
      • Web browser works as FTP client
    • TFTP
    • Network File System
  • Mail Services
    • SMTP
      • Common language used by the majority of mail servers
      • Send messages back and forth to other mail servers or email clients
    • POP3 “Post Office Protocol version 3”
      • Collects email messages from the mail server
      • Download messages on the machine
      • User can work offline
      • Saves quota on the server
    • IMAP4 “Internet Message Access Protocol version 4”
      • Retrieves the message header only
  • DNS Services
    • Domain Name System DNS resolves Domain Name into IP Address

 

Recommended Study Material
Learn on the go.
The app designed for the modern cyber security professional.
Get it on Google PlayGet it on the App Store
Practice Labs and Exam Vouchers

Congratulations! You're taking the first step to getting certified. Get some hands on experience with available practice labs OR save some money, support Cybrary, and purchase discounted exam vouchers. Ready to earn your next industry certification? Join cyber security's largest community and start learning today.

JOIN CYBRARY

Our Revolution

We believe Cyber Security training should be free, for everyone, FOREVER. Everyone, everywhere, deserves the OPPORTUNITY to learn, begin and grow a career in this fascinating field. Therefore, Cybrary is a free community where people, companies and training come together to give everyone the ability to collaborate in an open source way that is revolutionizing the cyber security educational experience.

Cybrary On The Go

Get the Cybrary app for Android for online and offline viewing of our lessons.

Get it on Google Play
 

Support Cybrary

Donate Here to Get This Month's Donor Badge

 
Skip to toolbar

We recommend always using caution when following any link

Are you sure you want to continue?

Continue
Cancel