Here are Top 25 multiple-choice questions (MCQs) focused on the HTML5 features and elements in Web Performance Optimization MCQs, along with their answers and explanations.
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1. What is the primary goal of web caching in the context of web performance optimization?
- To slow down website loading times
- To improve website aesthetics
- To reduce server load and speed up content delivery
- To add visual effects to web pages
The primary goal of web caching is to reduce server load and speed up content delivery, improving website performance.
2. Which of the following is not a common caching mechanism in web development?
- Browser caching
- Server caching
- Database caching
- Watermarking
Watermarking is not a common caching mechanism in web development.
3. What is the purpose of browser caching in web performance optimization?
- To reduce server load
- To increase website traffic
- To store website data on the server
- To slow down website loading times
Browser caching helps reduce server load by storing frequently used website data on the client-side.
4. What does CDN stand for in the context of web development?
- Content Display Network
- Central Data Network
- Content Delivery Network
- Centralized Distribution Network
CDN stands for Content Delivery Network, which improves content delivery by distributing it across multiple servers.
5. What is the primary purpose of a CDN in web performance optimization?
- To increase server load
- To slow down website loading times
- To reduce content delivery times and enhance website performance
- To add visual effects to web pages
The primary purpose of a CDN is to reduce content delivery times and enhance website performance.
6. What is a common HTTP response header used to control browser caching?
- Cache-Control
- Cache-Access
- Cache-Expiration
- Cache-Status
The "Cache-Control" HTTP response header is commonly used to control browser caching.
7. Which of the following is not a common technique for implementing server-side caching in web development?
- Object caching
- Page caching
- Browser caching
- Database caching
Browser caching is a client-side technique, while the others are server-side caching techniques.
8. What is the primary benefit of using browser caching in web development?
- Slower website loading times
- Improved server performance
- Increased server load
- Enhanced website security
The primary benefit of using browser caching is improved server performance.
9. Which HTTP status code indicates that a resource has not been modified since the last request and can be retrieved from the cache?
- 200 OK
- 304 Not Modified
- 404 Not Found
- 503 Service Unavailable
The HTTP status code "304 Not Modified" indicates that a resource has not been modified and can be retrieved from the cache.
10. What is the primary benefit of using a CDN for content delivery in web development?
- Increasing server load
- Reducing website traffic
- Faster content delivery to users
- Slowing down website loading times
The primary benefit of using a CDN is faster content delivery to users.
11. What is a common technique to control server-side caching for dynamic web pages?
- Page caching
- Browser caching
- HTML validation
- Watermarking
Page caching is a common technique to control server-side caching for dynamic web pages.
12. What does the "Expires" HTTP response header indicate in the context of caching?
- The creation date of a web resource
- The server's location
- The date and time when the resource will expire from the cache
- The resource's size in bytes
The "Expires" HTTP response header indicates the date and time when the resource will expire from the cache.
13. Which of the following is not a common type of content that can be cached in web development?
- HTML pages
- Images
- Streaming videos
- Stylesheets
Streaming videos are typically not cached due to their large size and dynamic nature.
14. What is a common technique to control browser caching for web resources?
- ETag
- Expires
- Cache-Control
- Content-Encoding
The "Cache-Control" HTTP response header is a common technique to control browser caching.
15. What does "CDN edge caching" refer to in the context of content delivery networks?
- Caching only the images on a website
- Caching at the network edge servers to reduce content delivery times
- Caching at the browser level
- Caching web resources on the central server
CDN edge caching refers to caching at the network edge servers to reduce content delivery times.
16. Which HTTP request header is used to request a fresh copy of a resource without using the cache?
- Cache-Control
- Expires
- If-Modified-Since
- Last-Modified
The "If-Modified-Since" HTTP request header is used to request a fresh copy of a resource without using the cache.
17. What is the primary benefit of using server caching in web development?
- Slower server performance
- Increased server load
- Reduced server response times
- Improved website aesthetics
The primary benefit of using server caching is reduced server response times.
18. What is the purpose of the "Vary" HTTP response header in web caching?
- To indicate when a resource will expire
- To specify which cache to use
- To control browser caching
- To indicate the request headers used to select a cached response
The "Vary" HTTP response header is used to indicate the request headers used to select a cached response.
19. Which of the following is a common CDN provider used in web development?
- Adobe Photoshop
- Google Maps
- Cloudflare
- MySQL
Cloudflare is a common CDN provider used in web development.
20. What is the purpose of "purging" in the context of CDNs?
- To slow down content delivery
- To remove content from the cache
- To improve server performance
- To add watermarks to web resources
"Purging" in the context of CDNs refers to the removal of content from the cache.
21. Which of the following is not a common HTTP caching directive?
- max-age
- must-revalidate
- server-status
- no-cache
"server-status" is not a common HTTP caching directive.
22. What is a common caching strategy to serve stale content when a server is temporarily unavailable?
- ETag
- Cache-Control. no-store
- Cache-Control. no-cache
- Cache-Control. stale-while-revalidate
"Cache-Control. stale-while-revalidate" is a common caching strategy to serve stale content when the server is temporarily unavailable.
23. What is the purpose of an "ETag" in the context of caching?
- To control browser caching
- To add watermarks to images
- To identify a specific version of a resource
- To specify cache expiration times
An "ETag" is used to identify a specific version of a resource for caching purposes.
24. What HTTP response status code is typically used to indicate a cache miss when a resource is not found in the cache?
- 200 OK
- 204 No Content
- 404 Not Found
- 503 Service Unavailable
The HTTP response status code "200 OK" is typically used to indicate a cache miss when a resource is found.
25. Which HTTP request method is typically used to request a cached resource without validating its freshness?
- GET
- POST
- PUT
- DELETE
The HTTP request method "GET" is typically used to request a cached resource without validating its freshness.
