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DVA > Route 53 > Flashcards

Route 53 Flashcards

1
Q

What is Route 53?

A

is a managed highly available and scalable cloud Domain Name System (DNS) web service

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2
Q

Which are the most common records in AWS Route 53?

A
  • A
  • AAAA
  • CNAME
  • Alias
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3
Q

What is A Route 53 record?

A

hostname to IPv4

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4
Q

What is AAAA Route 53 record?

A

hostname to IPv6

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5
Q

What is CNAME Route 53 record?

A

hostname to hostname

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6
Q

What is Alias Route 53 record?

A

hostname to AWS resource

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7
Q

What domains can Route53 use?

A
  • public domain names you own (or buy) application1.mypublicdomain.com
  • private domain names that can be resolved by your instances in your VPCs. application1.company.internal
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8
Q

What are the main features of Route53?

A
  • Load balancing
  • Health checks
  • Routing policy
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9
Q

How does Load Balancing work in Route53?

A

through DNS – also called client load balancing

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10
Q

How are Health Checks in Route53?

A

limited

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11
Q

What are the Routing Policies in Route53?

A
  • simple
  • failover
  • geolocation
  • latency
  • weighted
  • multi value
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12
Q

What is mandatory for each Route53 record?

A

TTL (Time to Live)

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13
Q

What is the impact of TTL on Route53?

A

impacts on traffic and the expiration of records (outdated or not)

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14
Q

What are the 2 main features that has Alias that CNAME does not have?

A
  • works for root domain as well

- includes Native health check

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15
Q

What is Route53 Simple Routing Policy?

A

Maps a hostname to another hostname

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16
Q

When to use Route53 Simple Routing Policy?

A

Use when you need to redirect to a single resource

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17
Q

How does work Route53 Simple Routing Policy health checks?

A

You can’t attach health checks to simple routing policy

18
Q

What if multiple values are returned in a Route53 Simple Routing Policy?

A

a random one is chosen by the client

19
Q

What is Route53 Weighted Routing Policy?

A

Control the % of the requests that go to specific endpoint

20
Q

What is helpful for Route53 Weighted Routing Policy?

A

Helpful to test 1% of traffic on new app version for example and to split traffic between 2 regions

21
Q

Can Route53 Weighted Routing Policy be associated with health checks?

A

yes

22
Q

What is Route53 Latency Routing Policy?

A

Redirect to the server that has the least latency close to us

23
Q

When is helpful to use Route53 Latency Routing Policy?

A

Super helpful when latency of users is a priority

24
Q

What is default number of health checks required for Route53 to determine the state?

A

3

25
Q

What is Default Health Check Interval for Route53?

A

30s can be set to 10s at a higher cost

26
Q

How many health checks are performed by Route53 the first time?

A

15, 1 request every 2 seconds on average

27
Q

What kind of health checks perform Route53?

A

Can have HTTP, TCP and HTTPS health checks (no SSL verification)

28
Q

What is possible to integrate to health checks in Route53?

A

CloudWatch

29
Q

To what is possible to link health checks to in Route53?

A

To DNS queries

30
Q

What is Route53 Failover Routing Policy?

A

lets you route traffic to a resource when the resource is healthy or to a different resource when the first resource is unhealthy

31
Q

What is Route53 Geo Location Routing Policy?

A

Use when you want to route traffic based on the location of your users

32
Q

What should you do when you use Route53 Geo Location Routing Policy?

A

create a “default” policy in case there is no match on location

33
Q

What is Multi Value Geo Location Routing Policy?

A

Use when routing traffic to multiple resources and want to associate a Route 53 health checks with records

34
Q

What is similar to a Multi Value Geo Location Routing Policy

A

to an ELB but is not a substitute

35
Q

What is a Registrar?

A

A domain name registrar is an organization that manages the reservation of Internet domain names like GoDaddy, Google Domains, ROUTE53, etc…

36
Q

What is not a Registrar?

A

a DNS (But each domain registrar usually comes with some DNS features)

37
Q

What is 3rd party Registrar in AWS Route 53?

A

If you buy your domain on 3rd party website, you can still use Route53.

38
Q

What do you need to create on Route53 for 3rd party registrar?

A

Need to create a hosted zone

39
Q

What do you need to do on a 3rd party registrar to use Route53 name servers?

A

Update NS Records on 3rd party website

40
Q

What means having a High Route 53 DNS Records TTL?

A
  • Less traffic on DNS

* Possibly outdated records

41
Q

What means having a Low Route 53 DNS Records TTL?

A
  • More traffic on DNS
  • Records are outdated for less time
  • Easy to change records

DVA (61 decks)

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