Unit 5: The DNS and Network Routing; The Reliability Pillar - Practice Quiz

1 What is the primary function of the Domain Name System (DNS)?

2 Amazon Route 53 is best described as which type of AWS service?

3 Which Route 53 feature allows you to purchase and manage a new domain name?

4 In Route 53, where are DNS records such as A, CNAME, and MX stored?

5 What does a Route 53 health check primarily monitor?

6 Which Route 53 routing policy routes traffic based on the geographic location of the user?

7 Which routing policy is used to send traffic to a backup resource when the primary becomes unhealthy?

8 What is the main benefit of Route 53 Traffic Flow?

9 What is the main purpose of Route 53 Resolver?

10 Amazon CloudFront is primarily used as which type of service?

11 What are the globally distributed caching points used by CloudFront called?

12 If a system has an availability of 99.9%, approximately how much downtime is allowed per year?

13 Which characteristic best describes a cloud-native application?

14 What is the main purpose of Amazon EC2 Auto Scaling?

15 What does a launch configuration define in EC2 Auto Scaling?

16 What advantage do launch templates offer over launch configurations?

17 What does an Auto Scaling group use to maintain a specified number of instances?

18 Which scaling option automatically adjusts capacity based on a target metric like CPU utilization?

19 What is the main purpose of data backup in AWS?

20 Amazon Elastic File System (EFS) provides which type of storage?

21 A user types www.example.com into a browser. Which DNS record type is primarily responsible for returning the IPv4 address that lets the browser reach the server?

22 Why is Amazon Route 53 described as a highly available DNS service rather than running on a single server?

23 A company registers shop.io through Route 53. After registration, which component must be configured so that queries for the domain are answered correctly?

24 You need to point blog.example.com to another domain name rather than an IP address. Which record type should you create?

25 A Route 53 health check reports an endpoint as unhealthy. What is the most direct effect on DNS responses when failover routing is configured?

26 An application must send users to the AWS Region that gives them the lowest network latency. Which Route 53 routing policy best fits this requirement?

27 A company wants 80% of traffic to go to a new application version and 20% to the old version for testing. Which routing policy achieves this?

28 What is the main advantage of using Route 53 Traffic Flow for a complex routing setup?

29 An on-premises network needs to resolve DNS names for resources inside an AWS VPC. Which Route 53 Resolver feature enables this?

30 How does Amazon CloudFront reduce latency for users accessing static website content?

31 Two components are in series, each with 99% availability. What is the approximate combined availability of the system?

32 Two redundant components in parallel each have 90% availability. What is the approximate combined availability?

33 Which characteristic best describes a cloud-native application designed for resilience?

34 An Auto Scaling group is set to maintain a desired capacity of 4 instances. One instance fails a health check. What does EC2 Auto Scaling do?

35 A team wants to update the instance type used by their Auto Scaling group but is using a launch configuration. What limitation will they encounter?

36 Why might an organization choose launch templates over launch configurations for Auto Scaling?

37 An Auto Scaling group spans three Availability Zones. How does this configuration improve resilience?

38 Traffic to an application is highly predictable, peaking every weekday at 9 AM. Which Auto Scaling option best prepares capacity in advance?

39 Which approach provides point-in-time recovery for an EBS volume with minimal management overhead?

40 An application running on several EC2 instances across multiple AZs needs a shared file system accessible by all instances simultaneously. Which service fits best?

41 A system has two independent components in series: a web tier with availability and a database tier with availability. What is the approximate end-to-end availability of the system?

42 Two redundant servers each with availability are placed in parallel (the service is up if either is up). What is the combined availability?

43 A company wants Route 53 to send of traffic to a newly deployed application stack and to the old stack to validate the release before full cutover. Which routing policy is the correct choice?

44 An application must direct users to the endpoint that gives them the lowest network latency, but also must never send traffic to an unhealthy endpoint. Which configuration best satisfies both goals?

45 A hybrid architecture needs on-premises servers to resolve records in a private hosted zone, and AWS resources to resolve on-premises DNS names. Which Route 53 Resolver configuration is required?

46 A dynamic API served through CloudFront is returning stale responses to some users even after the origin updates data. The cache behavior uses a long TTL. Which approach correctly serves fresh dynamic content while still caching static assets?

47 An Auto Scaling group uses target tracking on average CPU at . During a sudden spike CPU jumps to but scaling is slow and some instances get overwhelmed. Which combination most directly improves responsiveness to abrupt spikes?

48 Which capability is available with launch templates but not with launch configurations, making templates the recommended choice?

49 An Auto Scaling group spans three Availability Zones with 9 running instances. One AZ fails entirely. Assuming default behavior, what does the ASG do to maintain balance and desired capacity?

50 A critical database on an EBS gp3 volume needs point-in-time durable backups and the ability to restore quickly in another AZ. Which statement about EBS snapshots is correct?

51 Which scenario is the strongest justification for choosing Amazon EFS over EBS?

52 A business requires availability. Roughly how much total downtime per year does this budget allow?

53 A Route 53 health check is configured for an endpoint behind a firewall that blocks Route 53's health checker IPs, causing false failures. Which approach correctly restores accurate health monitoring?

54 To meet a strict RPO of near zero for a relational database, which strategy is most appropriate?

55 Why is Route 53 Traffic Flow preferred over manually created routing records for a large global application combining geolocation, latency, and failover logic?

56 A company registers a domain in Route 53. After registration, which statement about the authoritative name servers is correct?

57 An application has a predictable daily traffic surge at 9:00 AM and additional unpredictable spikes. Which combination of Auto Scaling options best handles both patterns cost-effectively?

58 A VPC architecture must survive the failure of any single Availability Zone while keeping outbound internet access for private subnets. Which design is correct?

59 A company needs a consistent, low-latency, high-bandwidth private connection between on-premises and AWS that does not traverse the public internet, with a resilient backup. Which design is most appropriate?

60 Which characteristic most distinguishes a true cloud-native application designed for resilience from a traditional lifted-and-shifted monolith?