c# zxing qr code generator Lesson 3 in C#

Printing QR Code in C# Lesson 3

Lesson 3
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Designing Security for Remote Access Users
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Copy the configuration of one IAS server computer to the other IAS server. This will allow both servers to perform the same authentication, authorization, accounting, and auditing functions for all of the RADIUS clients.
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Ensuring the availability of RADIUS servers and RADIUS clients means that your remote users have access to network resources located on the internal network, and that neither component can become a single point of failure in your remote access strategy. You may also want to ask management if they want to track accounting information, such as: How long was a connection established by a remote user or What time did the user log on to the system A basic rule of thumb for any design is to make sure the features of the service or components you implement do indeed support your com pany s requirements. For example, you would not implement a RADIUS solution if the company did not require centralized accounting, authentication, authorization, and auditing.
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Designing Client Connectivity
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There are different ways remote clients can access a RADIUS client. Your design must take into account the various network technologies discussed in Lesson 1:
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Dial-up modems
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Integrated Services Digital Network (ISDN)
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Your decision here may be based on the current infrastructure, or on financial con straints placed on you by the company. In any event, your network diagram would show the type of network technologies currently implemented and your recommended changes or additional components. Many companies that have a Frame Relay connec tion between geographic locations also have an ISDN line in place as a contingency. That way, if the Frame Relay connection became unavailable, the ISDN line can be used to access the company s network resources. You might consider doing the same for connections that rely on an ISP for connectivity. This can be quite risky. If your design only allows access to network resources when an ISP is up and running, you might want to consider having a dial-up server available in case the ISP becomes unavailable. One again, having all of your eggs in one basket is not recommended if the business depends on those eggs to function!
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Placement of RADIUS Servers and Clients
In designing your RADIUS solution you must consider how to place the RADIUS servers and RADIUS clients so they will be the most secure and will minimize network traffic over your network infrastructure. You must also decide whether the RADIUS cli ents will support dial-up and VPN-based remote access clients. At a minimum, your RADIUS design will contain at least one RADIUS server and one RADIUS client. The
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Designing a Remote Access Strategy
RADIUS client should be placed as close as possible to the remote access users. This includes the following advantages:
Reduces dial-up charges by using localized traffic Reduces traffic traversing WAN links Reduces the risk of exposing the company s confidential data because you have better control of the security between the RADIUS client and the company s pri vate internal network
The RADIUS server should be placed close to the domain controller (DC), which pro vides authentication for the remote access clients. The authentication server and the RADIUS server should both be located on the private network, reducing the risk of attack by unauthorized persons.
Practice: Designing Security for Remote Access Users
In this practice, you explore the requirements involved in planning secure remote access. Think of the company you work for now (or have worked for in the past) and describe your experience with network security. Use the following questions to guide your thoughts. 1. Which authentication and encryption methods do you use on your organization s network for remote access authentication For VPN authentication
2. If your organization has a wireless network, which authentication and encryption mechanisms does it use
3. Does your organization use RADIUS servers for authentication If so, do you use IAS or another implementation
4. Does your organization use any multifactor authentication methods, such as smart cards If so, when is their use required
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