Which element of the End-to-End Timing graph identifies the average time taken for a web server to process a request, fetch content from a database, and generate the content?

Question

Options

• AServer RTT
• BTotal Time
• CApp Response
• DData Transfer

• A
  7% (3)
• B
  2% (1)
• C
  88% (38)
• D
  2% (1)

Explanation

App Response represents the server-side processing phase - from when the server receives the request to when it begins sending back data. This encompasses all backend work: processing logic, querying the database, and rendering the response, making it the precise measure of server computation time.

Server RTT (Round Trip Time) measures network latency between the client and server - the travel time of packets - not server processing work, so it excludes database and generation time.

Total Time is the sum of all phases combined (DNS, connection, SSL, server processing, data transfer), making it too broad to isolate server processing alone.

Data Transfer is the time to transmit the already-generated response bytes from server to client - it starts after the server has finished processing.

Memory tip: Think of "App" in App Response as the application layer doing its job - querying, computing, generating. Everything the app does before it sends a single byte back is App Response time.

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