Describe Why Directives Use a Shared Memory Zone F5N1 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A web application uses NGINX as a reverse proxy. The administrator wants to implement a sticky session feature so that requests from the same client are always routed to the same upstream server. They plan to use the sticky directive. What is a critical requirement for this directive to function correctly across multiple worker processes?

   • AA shared memory zone to store the mapping of client sessions to upstream servers
   • BA separate configuration file for each worker process to store session data
   • CA dedicated worker process to handle all sticky session requests
   • DA cookie set by the master process that is replicated to all workers
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2. 7application · medium

   An administrator is configuring NGINX to limit concurrent connections per IP address using the limit_conn_zone directive. They notice that the directive requires a shared memory zone. What is the primary mechanism by which the shared memory zone ensures data consistency across worker processes?

   • AIt uses a file-based lock that serializes all access to the zone data
   • BIt provides a common memory region that all worker processes can read from and write to, with atomic operations for updates
   • CIt routes all requests through the master process, which updates the zone data centrally
   • DIt copies the zone data to each worker process and synchronizes them periodically
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4. 8application · medium

   An NGINX administrator is tuning the limit_req_zone directive for a high-traffic API. They want to ensure that the rate limiting is accurate even when requests are distributed across multiple worker processes. What aspect of the shared memory zone design is most important for achieving this accuracy?

   • AThe zone is stored in a database that all workers query for each request
   • BThe zone is replicated to each worker process and synchronized every second
   • CThe zone is mapped into the virtual address space of each worker process, allowing direct reads and writes
   • DThe zone is allocated in the kernel's memory space, allowing direct access by all processes
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5. 9foundation · easy

   What is the primary purpose of a shared memory zone in NGINX configuration?

   • ATo provide a common data area that multiple worker processes can access to share runtime information.
   • BTo define a virtual memory space for each worker process to isolate its operations.
   • CTo allocate memory for caching static files on disk.
   • DTo store SSL certificates and keys for faster handshake processing.
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6. 10expert · hard

   An NGINX administrator is configuring rate limiting for a service that receives a burst of traffic from a small number of IP addresses. They want to ensure that the rate limit is enforced accurately. They are considering whether to use a shared memory zone or a per-worker counter. What is the most important reason to use a shared memory zone?

   • AIt ensures that the rate limit is enforced globally across all worker processes
   • BIt reduces the amount of memory used by the rate-limiting feature
   • CIt provides a backup of the rate-limit counters in case a worker process crashes
   • DIt allows the rate limit to be changed without reloading NGINX
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