9. Explain How Firewall, DNS, Load Balancers, and Reverse Proxy in Application Deployment 200-901 Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A company runs a web application with a load balancer that distributes traffic across multiple backend servers. The application uses WebSocket connections for real-time updates. The load balancer is configured with HTTP health checks. During a deployment, one backend server is taken out of service for maintenance. What is the most likely impact on WebSocket connections?

   • AWebSocket connections will be unaffected because the load balancer uses HTTP health checks that do not affect WebSocket traffic.
   • BExisting WebSocket connections to the server being maintained will be terminated, and clients will need to reconnect.
   • CThe load balancer will continue to send new WebSocket connections to the server being maintained until the health check fails.
   • DExisting WebSocket connections will be transparently migrated to another server without interruption.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   How does DNS contribute to service discovery in an application deployment?

   • ABy balancing traffic across multiple servers based on load
   • BBy blocking unauthorized access to the application
   • CBy encrypting traffic between the client and the server
   • DBy mapping a service name to the IP address of the server that hosts it
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A company exposes multiple internal web applications to the internet. They want to use a single public IP address and a single TLS certificate for all applications, while routing requests to different backend servers based on the hostname in the HTTP request. Which component should be used?

   • AA reverse proxy configured with virtual hosting and SNI-based routing.
   • BA DNS server with multiple A records for each hostname.
   • CA load balancer with a single backend pool containing all application servers.
   • DA firewall with port forwarding rules for each application.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   What is the main purpose of a load balancer in an application deployment?

   • ATo filter traffic based on security rules
   • BTo distribute incoming traffic across multiple servers to improve availability and scalability
   • CTo cache static content and terminate SSL
   • DTo resolve domain names to IP addresses
   Reveal Solution Discussion Select an answer first
6. 5expert · hard

   A company runs a global web application with multiple load balancers in different regions. They want to use DNS-based global load balancing to direct users to the region with the lowest latency. They also want to ensure that if a region's load balancer becomes unhealthy, DNS automatically stops returning that region's IP. Which DNS feature should they use?

   • AGeo-based DNS routing with a static mapping of users to regions.
   • BA single A record pointing to a global load balancer that routes to the nearest region.
   • CRound-robin DNS with multiple A records and a short TTL.
   • DLatency-based DNS routing with health checks that automatically remove unhealthy regions from DNS responses.
   Reveal Solution Discussion Select an answer first