Alpha Ltd. company is a large retailer with more than 16000 employees, having outlets at different locations in India. The company is offering computers, its peripheral products and its services. Their business growth is

Protocol: It is a standard set of rules and procedures for the control of communication and network. Protocols determine how data are transmitted between computing devices and over networks. The protocol determines the following: type of error checking to be used data compression method (if any), how the sending device will indicate that it has finished a message and how the receiving device will indicate that it has received the message. POP3 and SMTP protocols: Email requires its own set of protocols and there are a variety, both for sending and for receiving mail. The most common protocol for sending mail is Simple Mail Transfer Protocol (SMTP). When configuring email clients, an Internet address for an SMTP server must be entered. The SMTP first checks the postage address to figure out where to send the mail. The SMTP needs a computer friendly IP address to locate and deliver the message to the recipient. To locate the IP, the SMTP contacts the DNS server (the internet phone book) to translate the recipients email address, simon@example.com to an IP address like "45.789.56.89". Once the associated IP has been found, it can determine if that domain has any Mail Exchanges Servers (MX) which detail any additional information about where the message should be routed to. This is just like checking if the recipient uses a mailbox or a PO box to receive their mail in real life. The most common protocol used by PCs for receiving mail is Post Office Protocol (POP). It is now in version 3 so it is called POP3. POP3 downloads the email from a server to a single computer, then deletes the email from the server. Email clients require an address for a POP server before they can read mail. The SMTP and POP3 servers may or may not be the same address. Both SMTP and POP3 use TCP for managing the transmission and delivery of mail across the Internet. POP3 gives an email user access to their emails stored in their user account on that server. One don't need to stay online for the emails to come through. Someone just need to leave a copy of an email on the server to access it.