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Creating a Dial-Up Solution
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If after conducting your conceptual design it was determined that there would be a need for the company to allow dialing capability for over 150 customers, there would now be many considerations to address:
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Where will you place the network access servers To provide for redundancy, will you have multiple network access servers in your design Will the servers be placed on the internal network or the perimeter network
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Designing a Remote Access Strategy
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Dial-up servers provide access to a company s internal network resources and your design must address such issues as:
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The total number of telephone lines, modems, and adapters needed to support the maximum number of remote client connections. The names of the user accounts that will be granted remote access. Any remote access policy restrictions that may apply to groups of users.
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You should also consider having additional phone lines and modems available in case there are changes in the number of remote users needing dial-up access to your network access server or if there are the inevitable equipment failures that occur on all networks.
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Creating a VPN Solution
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If your design requires that you design a VPN solution for your company, there are issues and questions that must also be addressed:
Which tunneling protocol will you use for your customers while they are connect ing to the network access server, PPTP or L2TP Will you use remote access policies to control access to resources What authentication and encryption methods will you use for VPN clients
Practice: Designing a Remote Access Infrastructure
In this practice, you design a remote access infrastructure for Northwind Traders. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter.
Scenario
Northwind Traders wants to enable its employees to access the corporate network over the Internet. Northwind Traders current network infrastructure is illustrated in the fol lowing diagram. To protect its product data, Northwind Traders wants to ensure that all connections to the corporate network use the most secure encryption method available. In addition, the company wants to optimize its network traffic to ensure that this additional traffic will have minimal impact on the wide area network (WAN) link connections.
Lesson 2
Designing the Remote Access Infrastructure
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Fractional E1 Paris E1 Dual E3
Broadband Atlanta
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Practice Questions
Based on the scenario, design a remote access infrastructure for Northwind Traders by answering the following questions. 1. Will you include any additional Internet connections in your design If so, at which locations Why
2. Where will you place the VPN servers Why
3. Which authentication and encryption methods will you specify in your design Why
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. Describe the components needed to design a dial-up access infrastructure.
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Designing a Remote Access Strategy
2. List some of the requirements you need to know before you can decide on the remote access design for your company.
3. As a network administrator for a small electronics company, your manager has hired an outside consultant to assist you in developing a remote access strategy. Many of the sales personnel want to be able to access database files from varied locations throughout the United States. The consultant has mentioned that using a tunneling protocol could offer you more security than simply connecting from the Internet. Explain what the term tunneling means. Give two examples of tunnel ing protocols supported by Microsoft Server 2003.
Lesson Summary
Before a conceptual remote access design can be created, a thorough understanding of the present network topology and documentation (network maps, inventory of all servers and workstations, etc.) must be available. To ensure that the network access servers are available to users, consider having an additional server configured in the same or a different subnet servicing the remote access infrastructure, for both redundancy and survivability. Before you can decide on the remote access design you will use for your company, you must identify the needs of the users, current network infrastructure, network traffic patterns, and any mission-critical applications that will run on the system.
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