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IT
Challenge your understanding of HTTP/2, HTTP/3, QUIC, TLS 1.3, TCP tuning, and Content Delivery Network architectures. Beantworte jede Frage und sieh sofort, ob du richtig liegst — jedes Mal mit Erklärung.
Ein kostenloser Multiple-Choice-Übungstest mit 16 Fragen zu IT. Jede Frage hat eine richtige Antwort und eine kurze Erklärung, und der vollständige Lösungsschlüssel unter dem Quiz dient zugleich als Lernzettel. Kein Konto, kein Zeitlimit — löse ihn so oft du willst.
Dies ist ein kostenloses Multiple-Choice-Quiz mit 16 Fragen. Nach jeder Antwort siehst du, ob sie richtig war — immer mit Erklärung. Keine Anmeldung, kein Zeitlimit: Mach es so oft du willst und nutze den Lösungsschlüssel oben zum Wiederholen, vorher oder nachher.
Richtige Antwort: BQUIC (built on top of UDP)
HTTP/3 replaces TCP with QUIC, an encrypted multiplexed transport protocol running over UDP that eliminates TCP head-of-line blocking.
Richtige Antwort: BIn HTTP/2, a dropped TCP packet stalls all multiplexed streams; HTTP/3 uses QUIC over UDP to isolate packet loss to individual streams
Because HTTP/2 runs over a single TCP stream, a dropped packet stalls the entire connection; QUIC handles streams independently over UDP, isolating loss to the affected stream.
Richtige Antwort: BIt reduces the standard full handshake to a single round-trip (1-RTT) and supports zero round-trip (0-RTT) resumptions
TLS 1.3 streamlined the cryptographic handshake from two round-trips (2-RTT) to one (1-RTT), and introduced 0-RTT session resumption for returning clients.
Richtige Antwort: AThe connection is vulnerable to Replay Attacks unless applications explicitly protect state-modifying requests
Because 0-RTT data is sent before the full handshake completes, an attacker who intercepts the initial packets can replay them, making it unsafe for non-idempotent operations.
Richtige Antwort: BA specialized header compression format that eliminates redundant metadata across requests using static and dynamic tables
HPACK compresses HTTP/2 headers using static and dynamic lookup tables, avoiding the transmission of repetitive headers (e.g., User-Agent, Cookies) and resisting CRIME attacks.
Richtige Antwort: BIt models the network pipe's actual bottleneck bandwidth and round-trip time to maximize throughput while minimizing packet queues and bufferbloat
Developed by Google, BBR measures actual path bandwidth and round-trip time, adjusting pacing rates to achieve high throughput without causing bufferbloat or relying on packet loss as a trigger.
Richtige Antwort: BServerless code (often compiled to WebAssembly or running in V8 isolates) executed at edge locations close to end-users
Edge workers run lightweight serverless code (e.g., in V8 isolates or Wasm runtimes) on CDN edge nodes globally, executing logic and transformations close to the user.
Richtige Antwort: BThe client can serve a stale cached response immediately while asynchronously fetching the fresh asset in the background
'stale-while-revalidate' permits clients to serve cached stale content immediately for fast responses, while an asynchronous request updates the cache in the background for future visits.
Richtige Antwort: BMultiple physical servers advertise the same IP address via BGP, routing clients automatically to the topologically nearest point of presence
Anycast assigns the same IP address to multiple edge locations worldwide; BGP routing directs user packets to the topologically closest data center, minimizing network distance.
Richtige Antwort: BIt allows data to be included and exchanged directly within the initial TCP SYN packet using a secure cryptographic cookie
TCP Fast Open uses a pre-shared TFO cookie to allow data payloads inside the initial SYN packet, cutting out a full round-trip delay during connection setup.
Richtige Antwort: BTo communicate backend server performance metrics (e.g., database lookup, cache hits) directly to the browser's DevTools and Performance API
The Server-Timing header passes server-side timing metrics (e.g., db=52ms, cache_miss) to the client, visible in browser developer tools and accessible via the Navigation Timing API.
Richtige Antwort: BIt allows the server to send link headers to the browser to preload critical CSS and JS assets while the main response is still being computed
HTTP 103 Early Hints returns critical link relations (preload, preconnect) while the server is still assembling the final response, allowing the browser to download assets early.
Richtige Antwort: BBrotli utilizes a built-in pre-populated static dictionary, achieving 15-25% better compression ratios than Gzip at similar speeds
Brotli includes a static dictionary of common web words and patterns, delivering substantially smaller file sizes than Gzip, which directly improves page load times.
Richtige Antwort: BA cached key expires, causing thousands of concurrent requests to hit the origin database simultaneously to regenerate the same asset
A cache stampede happens when a hot cache entry expires under heavy load; hundreds of incoming requests miss the cache simultaneously, overwhelming the origin database.
Richtige Antwort: BExcessive packet buffering in unmanaged network queues causes high latency and jitter, degrading real-time performance
Bufferbloat occurs when oversized router buffers hold packets instead of dropping them, introducing massive latency and jitter that severely degrades interactive connections.
Richtige Antwort: BReusing an existing open connection to fetch resources from different hostnames if they resolve to the same IP and share an SSL certificate
Connection coalescing lets a client reuse an existing HTTP/2 or HTTP/3 connection for requests to different domains if the domains resolve to the same IP and match the TLS certificate.