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Services and Applications
Published in Mário Marques da Silva, Cable and Wireless Networks, 2018
A data service comprises a functionality that is provided to the end user, making use of a specific program (application program). Examples of data services include IP telephony, web browsing, e-mail, and file transfer. On the other hand, an application program is a program, external to the network architecture, which allows to gain access to a certain service. For example, Microsoft Outlook, Microsoft Outlook Express, and Groupwise are three examples of specific application programs that can be employed to have access to the e-mail service. Web browsing is also a service that can be accessed making use of browsers such as Internet Explorer, Mozilla Firefox, Google Chrome, and so on. This corresponds to a user’s program, external to the network architecture.
Communication and Employability Skills
Published in Sharon Yull, BTEC National for IT Practitioners: Core Units, 2009
A range of other software can be used to communicate with other people; one example of this is e-mail. E-mail software allows you to create a message or send an attachment to a single user or multiple users. E-mail software includes standard tools that allow you to send and receive messages, sort messages in an inbox, save, edit and delete messages. Some e-mail software is solely for the purpose of communicating messages, such as ‘Eudora’ and ‘Outlook Express’, while other e-mail software is embedded within more advanced personal information management systems that include appointment scheduling, calendars and notes.
Study and design on the E-mail monitoring technique
Published in Amir Hussain, Mirjana Ivanovic, Electronics, Communications and Networks IV, 2015
SMTP and POP3 are both text-based protocols. They use "command" and "response" messages between the client and the server. Commands are texts sent to the server by the client, and responses are texts sent to the client by the server. Figure 2 shows the process of the protocol used by the E-mail client Outlook Express with an E-mail server.
An M/G/1 queue with two types of general heterogeneous service and optional repeated service subject to server’s breakdown and delayed repair
Published in Quality Technology & Quantitative Management, 2018
Gautam Choudhury, Chandi Ram Kalita
Consider a digital communication network system, where mail server transmits the email data from one station to another station. In emailing process, the Mail servers can be broken down into two main categories: outgoing mail servers and incoming mail servers. Outgoing mail servers are known as SMTP, or Simple Mail Transfer Protocol, servers. Incoming mail servers come in two main varieties. POP3, or Post Office Protocol, version 3, servers are best known for storing sent and received messages on PCs’ local hard drives. IMAP, or Internet Message Access Protocol, servers always store copies of messages on servers. After composing a message and hitting send, sender’s email client – whether it’s Outlook Express or Gmail – connects to its domain’s SMTP server. The sender’s email client communicates with the SMTP server, giving it sender’s email address, the recipient’s email address, the message body and any attachments. The SMTP servers process the recipient’s email address – especially its domain and then perform two types of job. In the first type of job it routed the message directly over to the domain’s POP3 or IMAP server, if the domain name is same as the sender’s and in the second type of job the SMTP server send message to the other domain’s server (DNS) if the domain name is different with sender’s. Typically, message processing request arrive at the SMTP server following Poisson stream and message can select any one of the two types of service at the SMTP server (depending upon the choice of the sender, the sender may send message with same or different domain name as recipient’s). The sender can resend the message again due to failure of the previous sending. In practice message processing request may fail due to failure of the SMTP server. After failure of the SMTP server, the server can be repaired. The repair time depends on the degree of failure of the SMTP server. Because the system performance may be heavily affected by SMTP server breakdown, it is well worth to investigate such system from the queueing theory point of view, as well as reliability point of view. In this scenario, the SMTP server, two types of job by SMTP server, message resend correspond to the server, two types of service and repeated service in the queueing terminology.