9. Explain How Firewall, DNS, Load Balancers, and Reverse Proxy in Application Deployment 200-901 Practice Questions (Page 6)

Questions 26–30

1. 26application · medium

   A company has multiple data centers, each hosting a copy of the application. They want to direct users to the nearest data center to reduce latency. Which DNS feature should be used?

   • AA low TTL to allow clients to quickly switch between data centers.
   • BGeoDNS (geographic-based DNS routing) to return the IP address of the nearest data center's load balancer.
   • CRound-robin DNS to alternate between data center IP addresses.
   • DDNS SRV records to specify the port and priority of each data center.
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2. 27foundation · easy

   Which statement correctly contrasts the functions of a firewall and a load balancer?

   • AA firewall filters traffic based on security rules, while a load balancer distributes traffic across servers
   • BA firewall terminates SSL, while a load balancer filters traffic
   • CA firewall distributes traffic, while a load balancer blocks malicious requests
   • DA firewall resolves domain names, while a load balancer caches content
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4. 28application · medium

   An e-commerce site runs on three web servers behind a load balancer. The load balancer performs health checks and distributes traffic. The DNS record for www.example.com points to the load balancer's virtual IP. During a flash sale, traffic spikes and one web server becomes unhealthy. What is the most likely impact on users?

   • AUsers will be unaffected because the load balancer will stop sending traffic to the unhealthy server and distribute the load to the remaining healthy servers.
   • BUsers may see errors because DNS will continue to send traffic to the unhealthy server.
   • CUsers will experience slower response times because the load balancer will continue to send traffic to all three servers to avoid overloading the healthy ones.
   • DUsers will be redirected to a maintenance page because the load balancer cannot handle the loss of one server.
   Reveal Solution Discussion Select an answer first
5. 29foundation · easy

   What is the primary function of DNS in an application deployment?

   • ATo cache web content to improve response times
   • BTo resolve human-readable domain names to IP addresses
   • CTo filter malicious traffic before it reaches the application
   • DTo distribute incoming requests among multiple servers
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6. 30application · medium

   A company deploys a web application with a load balancer that distributes traffic across four backend servers. The load balancer uses round-robin scheduling. The operations team notices that one server has more CPU and memory capacity than the others. They want to send more traffic to that server. What should they configure?

   • AUse a reverse proxy to cache responses from the more powerful server.
   • BConfigure the firewall to allow more traffic to the more powerful server.
   • CChange the load balancer scheduling algorithm to weighted round-robin and assign a higher weight to the more powerful server.
   • DChange the DNS record to point to the more powerful server's IP address.
   Reveal Solution Discussion Select an answer first