Microsoft Internet Information Server IIS Performance & Troubleshooting

Question 1

What IIS feature caches frequently requested static content in kernel mode for faster delivery?

Accepted Answer

Output Caching with kernel-mode caching

Answer

Kernel-mode caching stores responses in the HTTP.sys driver cache, eliminating user-mode overhead for cached requests.

Question 2

Which IIS diagnostic tool captures detailed information about failed requests including execution time and module traces?

Accepted Answer

Failed Request Tracing (FREB)

Answer

Failed Request Tracing (FREB) logs detailed per-request pipeline traces to XML files, invaluable for diagnosing 500/404 errors.

Question 3

What does IIS static compression do?

Accepted Answer

Compresses static files once and caches the compressed version for subsequent requests

Answer

IIS compresses static files (HTML, CSS, JS, images) on the first request and caches the compressed file for future hits.

Question 4

What HTTP status code does IIS return when a requested resource is not found?

Accepted Answer

404

Answer

HTTP 404 Not Found means IIS received the request but could not locate the file or resource at the specified URL.

Question 5

What does an HTTP 503 Service Unavailable response from IIS typically indicate?

Accepted Answer

The application pool is stopped or has crashed

Answer

A 503 usually means the worker process for the application pool is not running, stopped, or has hit its failure limit.

Microsoft Internet Information Server Practice Test