Tài liệu Module 9: Implementing Caching pdf

How Caching Works for Requests for New Objects How Caching Works for Requests for Cached Objects How Content Download Jobs Work How Caching Is Implemented in ISA Server 2004 Web Proxy Ch

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Module 9:

Implementing Caching

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Lesson: Caching Overview

What Is Caching?

How Caching Works for Requests for New Objects How Caching Works for Requests for Cached Objects How Content Download Jobs Work

How Caching Is Implemented in ISA Server 2004

Web Proxy Chaining and Caching

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What Is Caching?

ISA Server caching provides:

Improved performance — information is stored on the computer running ISA Server

Reduced bandwidth usage — no additional Internet

ISA Server caching scenarios include:

Forward caching — Internet Web servers

Reverse caching — internal Web servers

Forward caching — Internet Web servers

Reverse caching — internal Web servers

ISA Server caching stores a copy of requested Web content in the server memory or on the hard disk

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Server hard disk

How Caching Works for Requests for New Objects

www.contoso.com

http://www.contoso.com

Server RAM

6

ISA Server

2 4

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How Caching Works for Requests for Cached Objects

www.contoso.com

Server RAM

ISA Server

2

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How Content Download Jobs Work

www.contoso.com

Server RAM

ISA Server

2 4

1

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How Caching Is Implemented in ISA Server 2004

ISA Server caching optimizes Web caching

performance by:

ISA Server caching optimizes Web caching

performance by:

Using RAM and disk caching

Maintaining the RAM cache in physical memory

Maintaining a directory of cached items

Using a single cache file

Providing quick recovery

Using efficient cache updates

Providing automatic cleanup

Using RAM and disk caching

Maintaining the RAM cache in physical memory

Maintaining a directory of cached items

Using a single cache file

Providing quick recovery

Using efficient cache updates

Providing automatic cleanup

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Web Proxy Chaining and Caching

Internet

Branch Office Head Office

Branch Office

1

3

6 2 4

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Lesson: Configuring General Cache Properties

Caching Configuration Components

How to Enable Caching and Configure Cache Drives How to Configure Cache Settings

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Caching Configuration Components

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How to Enable Caching and Configure Cache Drives

Caching is disabled

by default on

ISA Server 2004

When you enable

caching, ISA Server

creates a file with an

initial size equal to

the size you chose

for the maximum

cache size on the

hard disk

Caching is disabled

by default on

ISA Server 2004

When you enable

caching, ISA Server

creates a file with an

initial size equal to

the size you chose

for the maximum

cache size on the

hard disk

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How to Configure Cache Settings

TTL

Configure caching of objects with undefined

Configure memory used for caching

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Practice: Configuring General Cache Properties

Enabling Web Caching on ISA Server Configuring Web caching on ISA Server

Internet Den-ISA-01

Den-DC-01

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Lesson: Configuring Cache Rules

What Are Cache Rules?

How to Create a Cache Rule

Managing Cache Rules

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What Are Cache Rules?

Cache rule options Default cache rule

Define the destination set that

the rule applies to Applies to all Web contentDefine how content is returned

to the user Returns non-expired content to the user

Define whether content is

stored in the cache Caches the defaultcacheable objects

Define whether to cache HTTP,

FTP, or both types of content Enables caching of both HTTP and FTP content

Define the maximum size for

cached objects Does not apply any size restrictions to cached objects

Define whether to cache

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How to Create a Cache Rule

Cache Rule

Destinations Use destination sets to define the Web content that this rule applies to

Content Retrieval Defines how ISA Server responds to client requests if the content is or is not in cacheCache Content Defines the types of content ISA Server will cacheCache Advanced

Configuration Defines maximum size for caching objects and SSL response caching

HTTP Caching Enables and configures TTL settings for HTTP contentFTP Caching Enables and configures TTL settings for FTP content

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Managing Cache Rules

Managing cache rules includes:

Modifying the cache rule configuration after creating the rule

Modifying the cache rule order to evaluate cache

rules for specific Web sites before cache rules for

all Web sites

Disabling or deleting cache rules that are no

longer required

Exporting the cache rule configuration before

modifying the cache rules in case the modification is not successful

Modifying the cache rule configuration after creating the rule

Modifying the cache rule order to evaluate cache

rules for specific Web sites before cache rules for

all Web sites

Disabling or deleting cache rules that are no

longer required

Exporting the cache rule configuration before

modifying the cache rules in case the modification is not successful

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Practice: Configuring Cache Rules

Configuring cache rules on ISA Server

Internet Den-ISA-01

Den-DC-01

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Lesson: Configuring Content Download Jobs

What Are Content Download Jobs?

How to Create a Content Download Job

Managing Content Download Jobs

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What Are Content Download Jobs?

Content download jobs:

Allow you to schedule content for download at a specific time even if no user on the network has requested the content

Improve Internet access performance

Can be used to download content to the branch office during nonworking hours

Can be used to ensure access to critical Internet content even when the Internet connection is

not available

Allow you to schedule content for download at a specific time even if no user on the network has requested the content

Improve Internet access performance

Can be used to download content to the branch office during nonworking hours

Can be used to ensure access to critical Internet content even when the Internet connection is

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