Question

How do e-mail, instant messaging, and Voice over Internet Protocol work, and how is information using these technologies kept secure?

Answer 1

IMPORTANT READ*****CHEGG GUIDELINES - This explanation is not your answer. Anything you submit must be of your own work. We are here to provide explanation and directions ONLY. Hope you understand! If you like my explanation, give this answer thumbs up by showing your support. Thank you*****

Emails: Email messages are composed using an email program (an email client). The email program assembles the email by combining the message content (the body) with the recipient, subject plus the date and time (the header). Email relies on a set of protocols to arrive at the correct destination. The email program (the email client) comes in two forms, a web based version like google mail where users must login through their browser to access their emails, or a client based version such as Outlook where users install software to access emails from their local computer. If you use a computer regularly, it’s pretty likely you send and receive countless emails each day. Emails from clients, subscriptions to newsletters, messages from friends and family and not tomention spammers. Most internet users don’t know these emails are sent or arrive in their inbox, and that’s okay. From the typical email user's standpoint, it seems simple. We think of email as something that pops up when messages come through to our mail client

Instant Messaging: Instant messaging (IM) technology is a type of online chat that offers real-time text transmission over the Internet. A LAN messenger operates in a similar way over a local area network. Short messages are typically transmitted between two parties, when each user chooses to complete a thought and select "send". Some IM applications can use push technology to provide real-time text, which transmits messages character by character, as they are composed. More advanced instant messaging can add file transfer, clickablehyperlinks, Voice over IP, or video chat.

VoIP : VoIP (Voice Over Internet Protocol) which, simply stated, means using the Internet to make and receive telephone calls.There are really three separate problems to solve before you can do it: alerting someone that you want to call them, turning your voice into digital sound and sending it over the Net (and receiving replies in the opposite direction), and "interfacing with" (linking in to) the ordinary telephone network, if your call is going to a traditional landline telephone or cellphone (mobile phone). Let's look at each of these in turn. When you make a traditional telephone call to a friend, you lift the receiver and listen for the dial tone before punching in someone's number. What's happening here is that you're opening up an electric circuit between your home phone and the telephone exchange. When you dial the number, the exchange opens up a second circuit to the receiver's phone, causing their handset to ring. As soon as your friend lifts the receiver, there's a complete circuit open between your two phones and you can start to talk ("send and receive voice data", if you prefer).With VoIP, things are different. Internet telephony is much more like cellphone telephony, with people having unique telephone numbers that aren't permanently linked to one physical location: the person you're calling could be anywhere on the planet (and might not be in the same place two days running). So the first part of making a VoIP call involves your computer locating the receiver on the Internet, signalling their computer to receive a call, and, once that's done, the two computers agreeing the technical nitty-gritty of how they will actually exchange the data (just as fax machines and modems "handshake" at the start of a call). For VoIP to work effectively, every computer that uses it has to do these things exactly the same way—and that's why VoIP systems use carefully agreed international standards (known as protocols). The two protocols that cover signalling are technically known as H.323 and SIP (Session Initiation Protocol, sometimes also known as RFC 4168). Simply speaking, these protocols set up a communication route between two IP addresses (the sender's and the receiver's) across which the actual telephone call data can be sent and received.

****Please please please LIKE THIS ANSWER, so that I can get a small benefit, Please****