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In this chapter, you learn about developing an Internet access strategy that enables your network users to access the services they need efficiently and securely. To connect a network to the Internet, you must select an appropriate connection type based on the network s requirements, determine what IP addresses you will use on your client computers, and decide how you will protect the network from Internet intruders. Although it is easy to connect a network to the Internet, doing so with appropriate security complicates the process considerably. This chapter examines the various types of shared Internet connections you can use for a network, describes how to evaluate a network s Internet access needs, and describes the methods you can use to protect the network from Internet predators. When planning an Internet access solu tion for your network, you might think that the security hazards in your situation are minimal and that the potential for abuse of the Internet connection by your own users is not an issue. Many network administrators feel this way at first and subsequently change their minds, usually when something bad happens. It is a good idea to con sider these factors at the start so that you can implement an Internet access solution that is sufficient and secure, before you lose any money or data. Lessons in this :
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Lesson 1: Planning an Internet Connectivity Infrastructure . . . . . . . . . . . . . . 3-3 Lesson 2: Selecting Routers and ISPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 Lesson 3: Securing and Regulating Internet Access . . . . . . . . . . . . . . . . . . . 3-24 Lesson 4: Troubleshooting Internet Connectivity . . . . . . . . . . . . . . . . . . . . 3-34
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3
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Planning Internet Connectivity
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Before You Begin
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This chapter requires an understanding of basic TCP/IP communications, IP address ing, and network infrastructure, as covered in 1, Planning a Network Topol ogy, and 2, Planning a TCP/IP Network Infrastructure. You should also complete the Case Scenario Exercises in s 1 and 2 before you perform the Case Scenario Exercise in this chapter.
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Lesson 1
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Planning an Internet Connectivity Infrastructure
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Lesson 1: Planning an Internet Connectivity Infrastructure
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Virtually every organization that runs a data network wants to provide its users with some type of access to the Internet. E-mail and Web sites have become essential busi ness tools in recent years, and supplying these tools has become a standard require ment of IT professionals. The questions of how you will provide the network with Internet access, how much Internet access you will provide, and how you will secure your private network against unauthorized access from the Internet are essential parts of a network designer s infrastructure plan.
After this lesson, you will be able to
List the criteria for determining how much Internet bandwidth a network needs
Estimated lesson time: 30 minutes
It wasn t that long ago that even businesses relied primarily on modems and telephone lines to provide users with Internet access. For this solution, each user required a modem, a dedicated phone line, and an account with an Internet service provider (ISP). An administrator also had to install the hardware, configure the computer to use it, and support it when something went wrong. This solution rapidly became expen sive and impractical for businesses with many users requiring Internet access. Today, the most common Internet access solution for businesses is to install a wide area network (WAN) connection running from the organization s private network to an ISP and share it among all the users on the network. The WAN connection can use any technology, ranging from a standard dial-up modem to a high-speed leased telephone line. You connect the private network to the WAN using a router, which forwards all traffic not destined for an address on the private network over the connection to the ISP. The ISP s network then relays the traffic to the Internet.
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