Can you sit the Frontend System Design Certification today?

A monolith split into five micro-frontends, none of which had enforced module boundaries beforehand, most likely results in what?

• AThe same coupling and confidence problems reproduced across five smaller pieces, now with cross-team contracts and duplicated dependencies added on top
• BAutomatically improved code organization in every piece
• CA complete elimination of all merge conflicts
• DGuaranteed faster CI across the board

Why can bursty traffic cause several requests to see the same stale page even after a revalidation window has technically expired?

• ABecause ISR guarantees zero staleness under high traffic
• BBecause bursty traffic disables ISR entirely for that page
• CBecause regeneration takes some real time to complete, and requests arriving in that gap still receive the stale version until the new one is ready
• DBecause ISR only supports one concurrent request at a time

What does prefetching a route's chunk ahead of an actual click accomplish?

• AIt hides the network round trip that route-based splitting introduces, so by the time the user actually navigates, the chunk is often already cached
• BIt permanently removes that route's code from the main bundle
• CIt forces the browser to render the route immediately, without a click
• DIt disables code-splitting for that specific route only

Why is refetch-on-window-focus a sensible default behavior specifically for server state, and not something client state needs?

• ABecause a user returning to a tab may find that server-owned data changed while they were away, whereas client-owned state couldn't have changed without their own interaction
• BBecause client state automatically refetches on focus already
• CBecause window focus events don't exist for client state
• DBecause refetch-on-focus is required by all browsers regardless of the data type

Which question is most useful for deciding whether a route needs partial hydration or islands at all?

• AHow many total lines of code the route's component file has
• BWhether the route's URL contains a query parameter
• CWhether the route is mostly static content with a few interactive widgets, versus uniformly and heavily interactive throughout
• DWhether the route was built before or after the rest of the site