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Translating Business Needs into Technical Solutions
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Technical Solution Use PPTP for the VPN protocol because it is less com plicated to implement.
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Business Need The ability to securely communicate between our Paris location and our New York location must be available by tomorrow. You must provide the ability for a small number of employees to use the Internet to access the corporate network. You must provide the ability for our 5000 employees to use the Internet to access the corporate network.
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Provide a remote access VPN infrastructure and use remote access policies. A small number of employees can be managed by using a single RRAS server. Provide a remote access VPN infrastructure that includes IAS for centralized authentication, authoriza tion (remote access policies), and accounting. To accommodate a large number of users, more than one RRAS server will be required. It will be difficult to synchronize remote access policies and manage logs on multiple servers. IAS can provide centralized man agement of multiple RRAS servers. No technical solution can provide absolute security, and management should be told this. However, you can recommend smart cards as a solution that pro vides more protection than using passwords.
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We want a solution that is so secure that it does not risk exposure of our data.
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How to Answer Interoperability Concerns and Technical Limitations
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To answer interoperability concerns and technical limitations: 1. Make a list of the known interoperability and technical limitations of the Windows VPN protocols and infrastructure solutions. 2. Scan the survey you made of the current environment to find items that match the list made in step 1.
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7-54
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3. List solutions to each issue you have identified. 4. Examine each solution against the business requirements and limitations of the project. 5. Propose a solution that will resolve the issue by meeting the business require ments and limitations. Listing interoperability concerns and technical limitations up front allows you to avoid much redesign effort and avoid costly implementation mistakes. To make the list, you must compare your survey of existing hardware, software, and network infrastructure and your knowledge of VPN protocols and infrastructure. One way to do this is to make a list of the known interoperability and technical limitations of the current Win dows VPN solutions and then scan the survey of the current environment looking for matches. After you have practiced this technique for awhile, the obvious interoperability and technical issues might just pop out at you. After you are aware of these issues, you can then respond to them with potential solutions. You might have to modify your recom mendations based on business needs, including budgetary and staffing requirements.
Example: Translating Business Requirements into Technical Solutions
Read the following description of the existing environment for Contoso, and then examine Table 7-15 for a list of the technical and interoperability issues and proposed solutions. Contoso has only one location: Atlanta, Georgia. You must provide a VPN solu tion that does not require providing additional computers to employees and keeps additional expenses to the barest minimum. Two groups of employees use the Internet to communicate with Contoso:
2000 employees telecommute from their home to do their work. These employees:
Use their own computers. Use computers that are a mix of Windows 98 second edition, Windows 2000, and Windows XP Professional. Are required to supply their own connection to the Internet. Use ISPs that block encryption. It is the policy of some ISPs to charge more for connections that can do more than simple Internet searches and downloads.
Lesson 5
Completing a Communications Design
7-55
500 employees work at corporate headquarters. Important facts about these employees include the following:
100 of them travel extensively. They use company-provided laptops on which Windows XP Profes sional is installed. Some of these employees hold executive positions within the company.
Contoso Technical and Interoperability Concerns and Solutions
Proposed Solution Require employees to use antivirus products and keep them updated. Provide this software for them (although this results in additional cost, the benefit is enormous). Require employees to keep systems patched. Specify PPTP for telecommuters, or allow both PPTP and L2TP/IPSec. Employees might have trouble understanding how to download the L2TP/IPSec cli ent, and providing technical support to their homes or other scripted solutions might be cost prohibitive. The employees using these ISPs will not be able to make a VPN connection. They must be required to switch ISPs, or if it is available pay more for a con nection using their current ISP that does allow encryption. The company might have to provide financial support for this transition.
Table 7-15
Problem Employees use their own computers. This can result in a higher exposure to viruses and worms. Some employees are using operating systems (Windows 98) that are not natively able to use L2TP/IPSec VPNs. Some ISPs block encryption.
You might have also noticed that the business requirement, although not explicitly stated, is present. This is the note that some of the traveling employees are executives. This type of statement should be followed up with questions to determine whether there is a need to provide a higher level of security for these executives or for all trav eling corporate headquarter employees.
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