IBM Tivoli and Cisco 사용자 설명서

 Chapter 2. Architecting the solution 

revalidation process takes place too often, this pop-up window may become 
annoying and significantly lower the user’s productivity. The recommended value 
is 14400 seconds (4 hours) or more.

The router or the 

 (NAD) periodically queries the client for 

the current policy compliance status changes. This activity introduces additional 
network traffic, which becomes larger as the defined time intervals shorten. 
However, frequent polling enables quick disconnection from a client that 
becomes noncompliant from the network. Depending on the network architecture 
(number of clients connected to one NAD, network bandwidth, current network 
load, and so on) the status query period should not be shorter than 30 seconds.

IBM best practice in implementation of this concept in an enterprise-wide 
deployment has been identified by the following project phases that would assist 
in a smooth transition to the new environment:

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Initiation

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Definition

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Design

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Build

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Maintenance

In the 

, high-level project requirements are gathered and verified 

to be included in the Statement of Work (SoW) document.

During the 

, those requirements are refined and documented in 

detail, and as a result several of the documents are created, including 

 (PDR), 

, and 

.

In the 

, the detailed design of the solution is created, typically in the 

form of architecture and design documents covering macro and micro design 
studies. Then the solution is actually implemented in the 

.

The final stage is 

 as the surrounding 

environment or business requirements change. This typically is a cyclic process 
as described in 2.3.2, “Security policy life cycle management” on page 30.

Any architecture must be easily scalable and available at all times for secure and 
reliable business transactions and the future growth of the business. This