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“No man but a blockhead ever wrote, except for money.” - Samuel Johnson. The textbook world is changing. On the one hand, open source. all part of, computer networks let us share information and resources. In business , In this chapter, you'll begin by relating networks to situations and concepts. than 35 For Dummies books, among them Networking For Dummies, 7th. Edition, Java All-in-One Desk Reference For Dummies, PowerPoint.
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Become a cyber-hero - know the common wireless weaknesses "Reading a book like this one is a worthy endeavor toward becoming an experienced wireless security professional. Discover how to: Perform ethical hacks without compromising a system Combat denial of service and WEP attacks Understand how invaders think Recognize the effects of different hacks Protect against war drivers and rogue devices.
Permissions Request permission to reuse content from this site. Table of contents Foreword. Part I: Building the Foundation for Testing Wireless Networks. Chapter 1: Introduction to Wireless Hacking. Chapter 2: The Wireless Hacking Process. Where to Begin? Internet Addresses Because the Internet is a global network of computers each computer connected to the Internet must have a unique address.
Internet addresses are in the form nnn.
This address is known as an IP address. IP stands for Internet Protocol; more on this later. The picture below illustrates two computers connected to the Internet; your computer with IP address 1.
The Internet is represented as an abstract object in-between. As this paper progresses, the Internet portion of Diagram 1 will be explained and redrawn several times as the details of the Internet are exposed.
In any case, if you are connected to the Internet, your computer has a unique IP address. It's called ping, probably after the sound made by older submarine sonar systems.
If you're using a flavor of Unix, get to a command prompt. A data packet is typically forwarded from one router to another through the networks that constitute the internetwork until it reaches its destination node. Unlike less advanced network hubs , a network switch forwards data only to one or multiple devices that need to receive it, rather than broadcasting the same data out of each of its ports. Bridge : a device that connects multiple network segments.
It works on OSI layers 1 and 2. Hubs are now largely obsolete, having been replaced by network switches except in very old installations or specialized applications. Hybrid[ edit ] Multilayer switch : a switch that, in addition to switching on OSI layer 2 , provides functionality at higher protocol layers.