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Flashcards in AWS Route 53 Deck (25)
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1
Q

Why is it called Route 53?

A

DNS runs on port 53 and the first interstate in the USA was Route 66. Thus, Route 53.

2
Q

What is DNS?

A

Domain Name Servers are conceptually similar to phone books and convert human friendly domain names such as http://acloud.guru to IP addresses such as http://82.124.53.1

3
Q

IPv4

A

32 bit addresses that is limited to just over 4 billion total addresses. (4,294,967,296)

4
Q

IPv6

A

Created to solve the depletion issue with IPv4. 128 bit addresses that allow for over 340 undecillion addresses (36 zeroes).

5
Q

What controls Top Level Domains?

A

Top Level Domains are controlled by the Internet Assigned Numbers Authority (IANA). They are held in a root database: http://www.iana.org/domains/root/db

6
Q

What is the Top Level Domain?

A

The Top Level Domain is the last part of a web address. For example: .com, .edu, .gov, etc.

7
Q

What is a Domain Registrar?

A

Domain names are registered with Domain Registrars such as Amazon and GoDaddy. InterNIC enforces the uniqueness of domain names on the internet and each domain name is registered in a central WhoIS database.

8
Q

What is a Start Of Authority Record?

A

An SOA Record stores information about the name of the server that supplied the data for the zone, the zone administrator, current data file version and time-to-live file.

9
Q

What are Name Server Records?

A

NS Records are used by Top Level Domain servers to direct traffic to the Content DNS server that contains the authoritative DNS records.

10
Q

What is an “A” record?

A

An “A” record is the fundamental DNS record. The “A” stands for address and is used by a computer to translate the domain name to an IP address.

11
Q

What is TTL?

A

Time-To-Live is the length of time in seconds that a record is cached on either the Resolving Server or the user’s local PC. The default is often 48 hours.

12
Q

What is a CNAME?

A

CNAME stands for Canonical Name and is used to resolve one domain name to another domain name.

13
Q

Can you use a CNAME for a naked domain name?

A

No! A CNAME must be used for either an A record or an Alias.

14
Q

Do Elastic Load Balancers have a pre-defined IPv4 address?

A

No! You resolve to them using a DNS name.

15
Q

Can you buy domain names directly from AWS?

A

Yes!

16
Q

How long does it take to register a domain?

A

I can take up to three days.

17
Q

What routing policies are available with Route 53?

A
  • Simple Routing
  • Weighted Routing
  • Latency-based Routing
  • Failover Routing
  • Geolocation Routing
  • Geoproximity Routing (Traffic Flow Only)
  • Multivalue Answer Routing
18
Q

What does the Simple Routing Policy do?

A

Simple Routing will essentially randomly distribute traffic to different servers under one DNS name based on IP addresses provided.

19
Q

What does the Weighted Routing Policy do?

A

Weighted Routing allows you to split traffic between servers based on weights assigned. For instance, you could send 10% of traffic to server 1 and 90% of traffic to server 2.

20
Q

What happens when a DNS record set fails a health check?

A

The record will be removed from Route 53 until it passes the health check.

21
Q

What does Latency-based Routing do?

A

Traffic is routed to whichever server will provide the server with the lowest latency.

22
Q

What does Failover Routing do?

A

Failover Routing allows you to set up an active/passive setup. If the active site fails a health check, it will divert traffic to the secondary site.

23
Q

What does Geolocation Routing do?

A

Geolocation Routing allows you to specify where traffic will be sent based on the user’s geographic location (That is, the location where a DNS query originates).

24
Q

What does Geoproximity Routing (Traffic Flow Only) do?

A

Geoproximity Routing lets Route 53 route traffic to your resources based on the geographic location of your users AND your resources.

25
Q

What does the Multivalue Answer Policy do?

A

It allows you to configure Route 53 to return multiple values in response to DNS queries. You can set health checks so that only healthy values are returned. Basically Simple Routing, with the addition of health checks.