Operating Systems

1. An operating system is a type of software:

True: It can be downloaded to a computer, and is a set of instructions on how the computer will run, but can also be called hardware.

2. Operating systems control the loading of software applications onto a computer:

True: because the operating system will download the needed software applications for that systems software.

3. All operating systems are for user preference, allowing you customize your computer:

True: You can change them all within the Operating System

4. An operating system prioritizes the task that the CPU does

True: it will organize the tasks in priority order.

5. The following devices have an operating system: Apple iPod, Dell Laptop, and Nintendo Wii

True: They are all complex computer devices.

Communicating on the Internet

Email Clients and Servers

Email uses client/server technology. If you have ever sent or received an email, then you have used an email client. An email client can be hardware or software based. The client is what allows you to preform tasks such as reading and sending emails, along with downloading attachments. Email client is what communicates with email servers, which are in charge of getting the email, where it is supposed to go.

How Email is Delivered over the Internet

The first step to delivering the email is that your email client connects to a Simple Mail Transfer Protocol (SMTP) server for your email domain. This is telling the email where to go. the SMTP server then looks at the domain of the address that the email is being sent to and queries a Domain Name System (DNS) server, to ask for the IP address of the domain in a question. There are two types of incoming-mail servers, POP3 and IMP, the biggest difference between the two is that when you get an incoming email from a POP3 server, you download it from the server onto the computer. On IMP server, the email stays on the server until you delete it.

How Instant Messaging Works

Instant messaging also known as IM has been around since the early 1990's. I became an alternative to chat rooms, this still allowed people to chat over the Internet in real time. Using IM, you can send and receive files, create chat room, and send messages to and from a cell phone. To use IM, you will need to download the client software needed for whatever service you want to use. From there you make an account and log in. The client, when logged in will send your IP address to all your contacts that are online, from there you are free to IM whatever you want. Some of the popular IM's are AOL Instant Messenger, Yahoo! Messenger, and Apple's iChat. 

How the Internet Works

What is the internet?
is the world's largest wide area network. The internet is made up of millions of smaller networks. Everything you find online comes through the Internet as i connects several networks together. Originally the internet was created as a research project for the government, so they could link all their information between headquarters. Back in the 1990's not many people had computers, so there wasn't a great demand for the Internet.


What is a protocol?
rules for how computers in a network communicate with each other. They control or enable the connection, communication, and data transfer between two computing endpoints. The protocol is like a guideline, with how to control the Internet. It has a list of do's and don't's for the Internet to follow, so it can successfully connect several networks. Protocol is the correct way to connect computers through multiple networks.

What is DNS?
DNS looks up the IP address for the host name of a website.DNS is like a phone book for the Internet; it looks up a host name and returns an IP address, or vice versa. When you type www.cnn.com into a web browser, the application has to go to a DNS server to find the IP address associated with www.cnn.com.