qr code generator c# dll free List 2 Modified in Visual C#

Printing QR Code in Visual C# List 2 Modified

List 2 Modified
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Scan QR Code ISO/IEC18004 In Visual C#.NET
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Site must connect to Trusted Root CA for Site San Francisco Paris New York Paris New York San Francisco CATSOne ParisOne CATSOne ParisOne CATSOne CATSOne Root Certificates Present on Router CATSOne CATSOne CATSOne CATSOne ParisOne ParisOne
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Router Router1 Router1 Router2 Router2 Router3 Router3
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To secure communications using L2TP/IPSec VPNs between Site 3 and Sites 2 and 1, both routers (Router1 and Router2) must trust the root CA of the CA hierarchy that issued at least one of the Router3 computer certificates, and Router3 must trust the root CA that issued them. The example scenario just presented identified the need for addi tional root CA certificate copies at all locations. To build such site-to-site connections, the next step would be to obtain and install the necessary root CA certificates for each site or use some other solution to the trust issue.
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Lesson 4
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Designing Secure Communications with External Organizations
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7-49
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Ways to Resolve Trust Issues
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For both Web server access and VPN router authentication where more than one orga nization is involved, trust issues can be resolved in three ways:
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A copy of the root CA certificate that is required is added to the certificate store of the Web server or of the VPN router. This might be the best solution when the number of certificates required is small. Perhaps trust of one external organiza tion s certificate hierarchy is required on one Web server. Perhaps the number of VPN routers that require certificates is small for example, one VPN router con nection with one other company is all that is needed. However, this solution does not scale well. As the number of VPN routers that must be configured with addi tional certificates increases, the time needed to configure them and maintain the certificates can be unmanageable. All certificates used can be purchased from a common public Certification Author ity. If all certificates come from the same root CA in this case the public one all certificates will be trusted. A cross-certification infrastructure can be built between the two CAs that are managed by different sites. If a cross-certification infrastructure is built, in its simplest form, all certificates issued by either hierarchy can be trusted by the other and no special configuration at the router level is required.
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See Also The technical aspects and design guidelines for cross-certification are discussed in 2.
Practice: Determining Where Trust Relationships Are Necessary
In this practice, you will examine requirements for multiple demand-dial VPNs. Your objective is to discover where it might be necessary to develop a trust relationship. Read the scenario and then answer the question that follows. If you are unable to answer the question, review the lesson materials and try the question again. You can find the answer to the questions in the Questions and Answers section at the end of the chapter.
Scenario
You are the security administrator for Humongous Insurance. All tunnels are remote access VPNs. The company has decided to improve security between all sites by pro viding site-to-site VPNs. The tunnel administrator has set up the VPN routers and configured the demand-dial interfaces, but some sites cannot connect to others. You have the following information to work with: a sketch of the necessary site-to-site VPNs (Fig ure 7-18) and a table that lists the trust relationships that are necessary (Table 7-13).
7-50
7
Designing Secure Communications Between Networks
RouterA VPN tunnels RouterD To internal network
Client Computer New York
Internet
To internal network RouterB RouterC
To internal network
CA GB1
CA AUS1
Figure 7-18 Humongous Insurance site-to-site VPNs
Table 7-13
Humongous Insurance Routers, Sites, and Certificates
Root CA for this router s computer certificate KC1 GB1 AUS1 KC1 Issuer for this router s computer certificate GV1 London! Reef1 NO1
Router RouterA RouterB RouterC RouterD
Review Question
Answer the following question. 1. Using Figure 7-18 and Table 7-13, make a list of the trust relationships that are nec essary. Then indicate which ones are already present and which ones need to be developed.
Lesson 5
Completing a Communications Design
7-51
Lesson 5: Completing a Communications Design
After you have absorbed the technical components and guidelines of VPN design and used this knowledge to select VPN protocols, understand trust relationships, and design parts of a VPN infrastructure, you must learn how to put these pieces together with business drivers, interoperability concerns, and technical limitations. Only then will you be able to formulate a complete and secure communications infrastructure.
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