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AWScloud~10 mins

Edge locations and CloudFront overview in AWS - Interactive Code Practice

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Practice - 5 Tasks
Answer the questions below
1fill in blank
easy

Complete the code to specify the AWS service that delivers content using edge locations.

AWS
service = "[1]"
Drag options to blanks, or click blank then click option'
AS3
BLambda
CEC2
DCloudFront
Attempts:
3 left
💡 Hint
Common Mistakes
Choosing S3 because it stores data but does not deliver via edge locations.
Selecting EC2 or Lambda which are compute services, not content delivery.
2fill in blank
medium

Complete the code to define the type of AWS locations that cache content for CloudFront.

AWS
location_type = "[1]"
Drag options to blanks, or click blank then click option'
AData Centers
BEdge Locations
CRegions
DAvailability Zones
Attempts:
3 left
💡 Hint
Common Mistakes
Confusing edge locations with availability zones or regions.
Thinking data centers is the specific term used by AWS for caching points.
3fill in blank
hard

Fix the error in the code to correctly create a CloudFront distribution with origin domain name.

AWS
distribution = cloudfront.create_distribution(OriginDomainName='[1]')
Drag options to blanks, or click blank then click option'
Amybucket.s3.amazonaws.com
Bmybucket.s3.amazonaws
Cmybucket.amazonaws.com
Dmybucket.s3
Attempts:
3 left
💡 Hint
Common Mistakes
Leaving out '.com' or '.amazonaws.com' in the domain name.
Using incomplete or incorrect domain formats.
4fill in blank
hard

Fill both blanks to create a CloudFront distribution with a cache behavior that allows GET and HEAD methods.

AWS
cache_behavior = {
  'AllowedMethods': ['[1]', '[2]'],
  'CachedMethods': ['[1]', '[2]']
}
Drag options to blanks, or click blank then click option'
AGET
BHEAD
CPOST
DPUT
Attempts:
3 left
💡 Hint
Common Mistakes
Including POST or PUT which are not cached by default.
Mixing allowed and cached methods incorrectly.
5fill in blank
hard

Fill all three blanks to define a CloudFront distribution with a default root object and enabled logging.

AWS
distribution_config = {
  'DefaultRootObject': '[1]',
  'Logging': {
    'Bucket': '[2]',
    'Enabled': [3]
  }
}
Drag options to blanks, or click blank then click option'
Aindex.html
Bmylogs.s3.amazonaws.com
CTrue
DFalse
Attempts:
3 left
💡 Hint
Common Mistakes
Using 'False' for logging enabled disables logs.
Leaving the bucket name incomplete or incorrect.
Choosing a wrong default root object.

Practice

(1/5)
1. What is the main purpose of AWS CloudFront edge locations?
easy
A. To deliver content closer to users for faster access
B. To store user data permanently
C. To run virtual machines
D. To manage AWS billing

Solution

  1. Step 1: Understand edge locations role

    Edge locations are small data centers worldwide that cache content closer to users.

  2. Step 2: Identify main benefit

    By caching content near users, edge locations reduce latency and speed up delivery.

  3. Final Answer:

    To deliver content closer to users for faster access -> Option A

  4. Quick Check:

    Edge locations = faster content delivery [OK]
Hint: Edge locations bring content physically closer to users [OK]
Common Mistakes:
  • Thinking edge locations store permanent user data
  • Confusing edge locations with main AWS regions
  • Assuming edge locations run virtual machines
2. Which of the following is the correct way to specify an origin domain name in a CloudFront distribution configuration?
easy
A. origin-domain-name: example_com
B. originDomainName = example.com
C. origin_domain_name: "example.com"
D. originDomainName: 'example_com'

Solution

  1. Step 1: Review CloudFront origin domain syntax

    CloudFront origin domain names are specified as strings with dots, e.g., "example.com".

  2. Step 2: Check option formats

    origin_domain_name: "example.com" uses correct key and string format with quotes and dot notation.

  3. Final Answer:

    origin_domain_name: "example.com" -> Option C

  4. Quick Check:

    Correct syntax uses quotes and dots [OK]
Hint: Use quotes and dots for domain names in config [OK]
Common Mistakes:
  • Using underscores instead of dots in domain names
  • Missing quotes around domain strings
  • Using incorrect key names or assignment symbols
3. Given a CloudFront distribution with an origin set to mybucket.s3.amazonaws.com and default cache behavior, what happens when a user requests a file not yet cached at the edge location?
medium
A. CloudFront serves a stale cached version from another edge location
B. CloudFront returns a 404 error immediately
C. CloudFront redirects the user to the origin URL
D. CloudFront fetches the file from the origin and caches it at the edge

Solution

  1. Step 1: Understand CloudFront cache miss behavior

    If a requested file is not in the edge cache, CloudFront retrieves it from the origin.

  2. Step 2: Confirm caching after retrieval

    After fetching, CloudFront caches the file at the edge location for future requests.

  3. Final Answer:

    CloudFront fetches the file from the origin and caches it at the edge -> Option D

  4. Quick Check:

    Cache miss triggers origin fetch and caching [OK]
Hint: Cache miss = fetch from origin + cache [OK]
Common Mistakes:
  • Assuming CloudFront returns error on cache miss
  • Thinking CloudFront redirects users to origin
  • Believing stale cache is served from other edges
4. You configured a CloudFront distribution but users report slow content delivery. Which of the following is a likely misconfiguration causing this issue?
medium
A. Edge locations are disabled in the distribution settings
B. Origin domain name is set to a region far from users
C. Cache behavior is set to cache all content aggressively
D. SSL certificate is attached to the distribution

Solution

  1. Step 1: Analyze origin location impact

    If the origin is far from users and cache misses occur, content fetch is slow.

  2. Step 2: Check other options

    Edge locations cannot be disabled; caching aggressively improves speed; SSL does not slow delivery significantly.

  3. Final Answer:

    Origin domain name is set to a region far from users -> Option B

  4. Quick Check:

    Far origin = slower fetch on cache miss [OK]
Hint: Far origin causes slow fetch, not edge settings [OK]
Common Mistakes:
  • Thinking edge locations can be disabled
  • Believing SSL slows down delivery significantly
  • Assuming aggressive caching causes slow delivery
5. You want to optimize a CloudFront distribution to serve a global audience with dynamic content that changes frequently. Which combination of settings best achieves low latency and fresh content delivery?
hard
A. Use multiple edge locations with short TTL cache settings and origin failover
B. Use a single origin with long TTL cache and disable edge caching
C. Use edge locations only in one continent and long TTL cache
D. Disable caching and serve all requests directly from origin

Solution

  1. Step 1: Consider global audience needs

    Multiple edge locations reduce latency by serving users nearby worldwide.

  2. Step 2: Handle dynamic content freshness

    Short TTL cache ensures content updates quickly; origin failover improves reliability.

  3. Step 3: Evaluate other options

    Long TTL delays updates; single continent edges increase latency; disabling cache increases load and latency.

  4. Final Answer:

    Use multiple edge locations with short TTL cache settings and origin failover -> Option A

  5. Quick Check:

    Global edges + short cache + failover = best freshness & speed [OK]
Hint: Combine global edges with short cache for fresh, fast content [OK]
Common Mistakes:
  • Using long TTL caches for dynamic content
  • Limiting edge locations to one region
  • Disabling caching causing high latency