Biểu đồ là cách trình diễn số liệu rất hiệu quả trong các chương trình tính toán hoặc thống kê, đặc biệt là Microsoft Excel. Bài giảng Hướng dẫn vẽ Pareto offiice 2007 sau đây sẽ giới những thao tác cơ bản để tạo biểu đồ từ bảng dữ liệu trong phiên bản Excel 2007.
Hello, and welcome to Information Security: The Big Picture. My name is Stephen Fried, and over
the course of the next six hours I will be guiding you on a tour of the world of information security.
This course provides an introduction into the area of computer and network security. As more and
more people and companies connect to the Internet, the incidence of hacker attacks, break-ins, and vandalism continues to increase.
The World Wide Web has become the de facto communications medium for the Internet. Millions of people use it every day to get
information, communicate with coworkers, buy and sell goods, entertain themselves, and keep up to date with current events. However, most of
these people have very little knowledge about how the web actually works. On this slide we will give you a brief introduction to the web and tell
you everything you always wanted to know about the web but were afraid to ask. All in less than three minutes....
The Internet Protocol (IP) is the protocol by which information is sent from one computer to another on
the Internet. Each computer on the Internet has at least one address that uniquely identifies it from all other
computers on the Internet. When you send or receive data (for example, an e-mail note or a web page), the
message gets divided into little chunks called packets.
You hear a lot of talk about firewalls in relation to network security. The name “firewall” comes from the building industry and it
denotes a wall constructed to stop (or at least slow) the spread of fire from one space to another. In network security, a firewall
serves the same purpose. But instead of being built from bricks or steel it is built with computers and routers. But the concept is
still the same. A network firewall is designed to protect what’s “inside” the firewall from what may be “outside.