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9 Designing Internet Connectivity
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Design Internet connectivity for a company
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In 8, Designing a Network and Routing Infrastructure, you recall, many companies chose to use private Internet protocol (IP) addressing for their network to save on the cost of issuing public IP addresses to all of their nodes. Pri vate IP addressing is an efficient and inexpensive solution, but using private IP address network identities (IDs) prevents users from having direct access to the Internet. In these cases, some form of translation must take place in the network that converts the private IP addresses into public IP addresses that are routable and therefore enable Internet connectivity. This chapter gives you an overview of the technology that translates and maps the private IP addresses a company uses to yield a public address that is routable over the Internet. You ll see how Network Address Translation (NAT) functions and learn how to design a NAT strategy for your company. Lessons in this :
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Lesson 1: Identifying Redundancy Requirements. . . . . . . . . . . . . . . . . . . . . . 9-2 Lesson 2: Identifying Bandwidth Requirements . . . . . . . . . . . . . . . . . . . . . . . 9-8 Lesson 3: Understanding NAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12 Lesson 4: Designing a NAT Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-18
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To complete this chapter, make sure you are familiar with the concepts described in 1, Introduction to Active Directory and Network Infrastructure.
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Designing Internet Connectivity
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Lesson 1: Identifying Redundancy Requirements
Just as it is important to have redundancy using Redundant Array of Inexpensive Disks (RAID) to protect your file system and data files, you might need to protect your con nectivity to various parts of your network infrastructure. If there is only one way to get to the Internet or to your network resources, this can later prove to be a problem if that one way becomes unavailable.
After this lesson, you will be able to
Describe the various links that provide redundancy. Identify various connection types available.
Estimated lesson time: 20 minutes
Creating a Redundant Infrastructure
When you design a system that gives your company access to the Internet, you might want to consider having more than one way to connect to the Internet, especially if your company relies on this connectivity to do business. However, just as a security professional would not spend $50,000 to protect a company s data that is worth $5,000, you should consider the cost of your redundant system as it relates to the value of downtime or the inability to connect to the Internet. For example, if a company must wait several hours while the Internet service provider (ISP) repairs a downed Domain Name System (DNS) server, would that downtime cre ate a hardship for the company that could affect its financial viability Could the com pany lose Internet connectivity and without losing money to the extent that it would cause a financial hardship Companies that do thousands of transactions per minute over the Internet, such as investment trading companies or retail companies that sell large quantities of goods, might warrant the creation of redundant systems. Such a company would not only require the network infrastructure be protected with redundant systems but might also require redundant power systems. Government agencies might require gas-powered generators that would kick in if the public power supply experienced a blackout or brownout. Before designing redundancy into your connectivity design, ask yourself the following questions:
Is redundancy required If your company does not require connectivity to the Internet to do its business, you can spend your information technology (IT) budget in other areas. You might need to create redundancy of your hard disks or computer systems (clustering) more than you need to concern yourself with redundant links or routers that will be needed in case of a failure.
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