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Design Activity: Designing the Logical Infrastructure
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Exercise 1: Design the CA Hierarchy
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1. What is your recommendation
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Recommendation: Wingtip Toys should implement a two-tier hierarchy with an offline root.
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2. What are your reasons for making this recommendation
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Answers may vary. Here are some reasons: 1) Because of the small size and scope of the project, it is tempting to establish a single enter prise root CA. This would be the most efficient and least costly design to implement. However, it does not provide for future growth. If a more extensive CA hierarchy is required in the future, the root CA cannot be taken offline. Wingtip Toys might end up with multiple hierarchies or the CA might have to be decommissioned and replaced. 2) An enterprise CA cannot be protected as well as an offline stand-alone root. The computer used to implement the root can be a less expensive system because its usage will be limited. 3) An offline root will add to the complexity of the process and to management overhead. However, it will meet the need for future growth, be more secure, and, after it is established, will require little administrative overhead.
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Exercise 2: Design Enrollment and Revocation
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1. What are your recommendations
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1) The root CA should issue only CA certificates. Any request should always be set to pending. 2) The enterprise subordinate CA should issue only IPSec certificates. All other certificate tem plates should be removed. 3) The CDP and AIA for the offline root should be changed to network-available sites. 4) The CRL publication periods for the offline CA should be set to 6 months and only manual publication should be permitted. 5) The publication period for the enterprise CA should be shorter, perhaps the default of one week. 6) Auto-enrollment for IPSec certificates should be configured.
Questions and Answers
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2. What are your reasons for making these recommendations Answers may vary. Here are some reasons:
1) Other certificate templates can be restored if future requirements dictate it. Leaving them out for now prevents some possible forms of abuse. 2) Moving the CDP and the AIA of the offline root to the network allows them to be found as required. 3) Manual publication of the CRL is necessary because the offline CA can t publish to network sites. 4) The Enterprise CA CRL publication period should be small so that revocation numbers should be small, and thus interference with Active Directory replication nonexistent. Having a short publication period improves security, as information on revoked certificates will be available sooner to certificate verifiers. 5) Although not every computer needs an IPSec certificate at the current time, there does not seem to be a security risk at this time with providing each machine with a certificate. If IPSec policies are developed, there will be one less step in their deployment.
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Exercise 3: Design Security for the CA
1. What are your recommendations
Recommendations: 1) Enforce role separation. 2) Provide full auditing.
2. What are your reasons for making these recommendations
Reasons include: 1) To require enforced role separation in a tiny startup company might provide little benefit. However, in a company the size of Wingtip Toys, having role separation that is, CA administra tion vs. computer administration is manageable and provides benefits. 2) Auditing should not be compromised. Full auditing of all CA procedures, including certificate enrollment, is necessary. Automated processes for collecting audit logs and filtering significant events and trends should be purchased or developed. Auditors, trained individuals outside of the IT department, as well as IT management, should be involved from the start in the review of security logs, tracking of events, and investigation of anomalies or potential attacks or abuses of privilege.
3 Designing the Network Infrastructure for Physical Security
Exam Objectives in this :
Create the physical design for a secure network infrastructure.
Design for network infrastructure security. Specify the required protocols for the firewall configuration. Design Internet protocol filtering. Design an IPSec policy. Secure a DNS implementation. Design security for data transmission.
Why This Matters
If an attacker can launch a denial of service (DoS) attack against your Domain Name System (DNS) server or poison its database, she doesn t need to go any further to disrupt your network. If the attacker can step across your network boundaries and access your most sensitive data with impunity, she has the abil ity to put you out of business. If all communications on your internal network can be captured and read, your network is a prime target for a sudden destruc tive attack for example, by some disgruntled employee who was just laid off. This chapter teaches you how to design the network infrastructure for physical security completing what you must know to create a security design for the network infrastructure. Lessons in this :
Lesson 1: Designing Network Border Control . . . . . . . . . . . . . . . . . . . . . . . . .3-3 Lesson 2: Securing DNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27 Lesson 3: Designing Security for Internal Data Transmissions . . . . . . . . . . . . 3-34
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