Load Balancing Fundamentals F5N2 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A multi-tenant application uses NGINX to load balance requests across a pool of backend servers. The application requires session persistence based on the client's IP address. The team has configured the upstream block with the ip_hash directive. However, they notice that some clients are being routed to different servers on subsequent requests, causing session loss. What is the most likely cause?

   • AThe ip_hash directive is not supported in the open-source version of NGINX.
   • BThe backend servers have different weights configured.
   • CThe clients are behind a proxy or NAT that changes their source IP address between requests.
   • DThe upstream block does not have a keepalive directive configured.
   Reveal Solution Discussion Select an answer first
2. 22expert · hard

   A large e-commerce platform uses NGINX to load balance requests across a pool of 10 backend servers. They use the hash directive with the $request_uri variable to ensure that requests for the same product page are served by the same server, maximizing cache efficiency. The team needs to add two new servers to the pool to handle increased traffic. They are concerned about the impact on cache hit rates. What is the best approach to minimize cache disruption?

   • AAdd the consistent parameter to the hash directive and then add the new servers.
   • BUse the ip_hash directive instead of the hash directive.
   • CAdd the two new servers with a weight of 0 initially and gradually increase the weight.
   • DAdd the two new servers to the upstream block and reload NGINX.
   Reveal Solution Discussion Select an answer first
4. 23foundation · easy

   What is the recommended way to remove a server from an NGINX upstream pool?

   • ADelete the server directive from the upstream block and reload NGINX
   • BSet the server's weight to 0 and reload NGINX
   • CSend a SIGTERM signal to the backend server process
   • DUse the nginx -s remove command
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   What does the generic hash algorithm in NGINX use to determine which server receives a request?

   • AThe server with the fewest active connections
   • BThe client's IP address only
   • CA user-defined key, such as a variable or text
   • DA random number generated for each request
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   Which directive enables the least_time load balancing algorithm in NGINX Plus?

   • Arandom two least_time;
   • Bleast_time header;
   • Chash $request_uri;
   • Dleast_conn;
   Reveal Solution Discussion Select an answer first