Chapter 9: TCP/IP Applications Pg 301 - End

Rlogin, RSH, and RCP
- Remote Login (Rlogin): you can connect and run commands by running the program with the host name of the server
       -> can configure it to log in automatically without needing to enter a username and password
       -> only connects using UNIX hosts
- Remote Shell (RSH): enables you to send single commands to the remote server
        -> runs over TCP port 514 by default
- Remote Copy Protocol (RCP): provides the capability to copy files to and from the remote server without needing FTP or NFS 

SMTP, POP3, AND IMAP4
- Simple Mail Transfer Protocol (SMTP): used to send e-mail
- Post Office Protocol 3 (POP3): receives e-mail from SMPT using TCP port 110
- Internet Message Access Protocol 4 (IMAP4): retrieves e-mail from an e-mail server
         -> enables you to search through your messages on the mail server to find specific keywords
         -> supports the concept of folders
       
File Transfer Protocol (FTP)
- original protocol used on the internet for transferring files
- can transfer while keeping security and data integrity
- uses TCP ports 21 and 20 by default

Things To Remember: 

1. Secure Sockets Layer (SSL) is a protocol developed by Netscape for transmitting private documents over the internet. SSL works by using a public key to encrypt sensitive data.
2. URLs that use an SSL connection start with HTTPS 
3. SSH encrypts data and is more secure than Telnet. SSH uses port 22.
4. Telnet is used to issue commands to a remote server