You administer a Windows Essential Business 2008 environment. You install Forefront Threat Management Gateway (TMG) on the Security Server to provide security and Web cache solution to the network.
The users in your company are editors who write reviews about movies before they are released. These users collect information for their reviews by visiting various movie Web sites, which include Web sites that contain static content and dynamically changing entertainment Web sites. Often, users view video clips and snippets of the movies. These movie reviews also go through peer reviews, and therefore, the same video files are downloaded again by other employees for your company.
To optimize and speed up the access to these files, you create a cache rule on the Security Server. You select the If any version of the object exists in the cache. If none exists, route the request to the server option on the Cache Store and Retrieval tab in the Properties dialog box for the cache rule. You also select the Content for offline browsing option. You decrease the Time-To-Live (TTL) for HTTP objects.
To validate your configuration, you request feedback on the access time to the various entertainment sites. The editors report that there is no noticeable difference in access times to the entertainment sites.
You are required to ensure that content from movie and entertainment sites is always available to the editors. What should you do?
A.
Edit the cache rule, and select the Dynamic Content option on the Cache Store and Retrieval tab.
B.
Edit the cache rule, and select the Content required user authentication for retrieval option on the Cache Store and Retrieval tab.
C.
Edit the cache rule, and select the Also apply these TTL boundaries to sources that specify expiration option on the HTTP tab.
D.
Edit the cache rule, and select the Only if a valid version of the object exists in the cache. If no valid version exists, route the request to the server option on the Cache Store and Retrieval tab.
Explanation:
You should select the Dynamic Content option on the Cache Store and Retrieval tab. Forefront TMG allows you to configure advanced firewall, virtual private network (VPN), and Web cache solutions for your network. You can modify existing cache rules or create new cache rules on Forefront TMG to define what type of content is cached. Cache rules can also be used to define how Web information is stored and returned to the users from the cache.The If any version of the object exists in the cache. If none exists, route the request to the server option on the Cache Store and Retrieval tab specifies that Forefront TMG should retrieve the requested object from its cache if any version exists, even if the version has expired. However, if no version exists in the cache, the Forefront TMG server will then retrieve the requested content from the Internet. The Content for offline browsing option specifies that Forefront TMG server should cache content with 302 and 307 response codes. These response codes indicate that the content has been temporarily relocated or the client has been temporarily redirected. The TTL specifies the amount of time for which the content should remain in the cache before expiring. The Dynamic Content option in the Cache Content page specifies that Forefront TMG server should also cache the dynamic content that would not be cached typically.
You should not select the Content required user authentication for retrieval option on the Cache Store and Retrieval tab. The Content required user authentication for retrieval option configures Forefront TMG to cache content that may require user authentication before it is accessed. Therefore, selecting the Content required user authentication for retrieval option will not enable you to achieve the desired goal.
You should not select the Also apply these TTL boundaries to sources that specify expiration option on the HTTP tab. This option is used to configure Forefront TMG TTL settings to override the expiration data included with the content. Therefore, selecting the Also apply these TTL boundaries to sources that specify expiration option will not enable you to achieve the desired goal.
You should not select the Only if a valid version of the object exists in the cache. If no valid version exists, route the request to the server option on the Cache Store and Retrieval tab. This option specifies that Forefront TMG server should retrieve the requested object from the cache only if it has not expired. Forefront TMG server will retrieve the content from the Internet if the version stored in the cache has expired. Therefore, selecting the Only if a valid version of the object exists in the cache. If no valid version exists, route the request to the server option will not enable you to achieve the desired goal of speeding access.