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Welcome to the module in which we'll discuss how to design computer networks.

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We'll consider how to close the gap between security and functionality.

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In previous modules we took quite some time to show that security and functionality cannot be in conflict

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with each other.

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You should never try to introduce a security policy that would in any way inconvenience users in their

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daily work.

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Otherwise users will quite consciously ignore such a policy.

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Thus the actual level of security of the system will be lower than it should be.

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In this module we will show that sudden netting can improve the security of the whole network

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Moreover the ways to minimize the area that can be affected by an attack can reduce potential losses

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will be analyzed.

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Also we'll see how to apply sudden ending in the case of IP version 4 addresses the CD-R addressing

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and if there are any differences in the sixth version of this protocol.

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Then we will shortly discuss the differences between IP version 6 and IP version for

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next we will explore the subject of a special subnet called the demilitarized zone.

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It's a virtual area in which you can place high risk computers or hosts

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towards the end we will examine how network services influence the overall security of the system.

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Services such as subsetting that is routing with the use of manageable switches in the second layer

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of the OSA model will be briefly discussed.

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We will scrutinize the mechanisms behind the IP Essec a secure Internet Protocol and evaluate the protection

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it offers.

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We will also get acquainted with the address translation service proxy servers and remote access services.

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I hope you'll enjoy this part of the seminar.