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KembaraXtra- Computer Science - Application Protocols
This study guide summarizes key application protocols for the Tech+ exam, focusing on identification and secure alternatives.
I. Website Protocols
II. Email Protocols
Email involves multiple protocols:
III. File Transfer and Administrative Protocols
This study guide summarizes key application protocols for the Tech+ exam, focusing on identification and secure alternatives.
I. Website Protocols
- HTTP (Hypertext Transfer Protocol): Used for websites. Transmits web page elements (text, graphics, etc.) between web server and client (browser). Insecure: Data is unencrypted; susceptible to eavesdropping.
- HTTPS (Hypertext Transfer Protocol Secure): Secure version of HTTP. Uses encryption (TLS/SSL) to protect data in transit, preventing eavesdropping. Crucial for confidentiality.
II. Email Protocols
Email involves multiple protocols:
- SMTP (Simple Mail Transfer Protocol): Used to send email messages between mail servers.
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Receiving Email Protocols: Clients use these to retrieve emails from the server.
- HTTPS: Used by webmail clients (like Gmail) for both sending and receiving. Provides security.
- POP3 (Post Office Protocol version 3): Downloads emails to the client and deletes them from the server. Older protocol; less flexible. Has a secure version, POP3S (using SSL/TLS).
- IMAP (Internet Message Access Protocol): Keeps emails on the server; client accesses them. Allows access from multiple devices. Has a secure version, IMAPS.
III. File Transfer and Administrative Protocols
- FTP (File Transfer Protocol): Original protocol for transferring files between clients and servers. Insecure: lacks built-in security.
- SFTP (Secure File Transfer Protocol): Secure version of FTP, utilizing SSH for encryption.
- FTPS (File Transfer Protocol Secure): Another secure FTP variant, using either SSL/TLS or SSH for encryption.
- SSH (Secure Shell): Used for secure command-line access to remote systems. Provides strong authentication and encryption.
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