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Fully Merged AWS SA Prep > DNS / Route 53 > Flashcards

DNS / Route 53 Flashcards

1
Q

Why is it called Route 53?

A

Think Route 66, in that it goes aross everything (one side of the country to the other) DNS is on port 53

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2
Q

What does DNS stand for?

A

Domain Name System

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3
Q

What is DNS used for?

A

DNS is used to convert human-friendly domain names into IP addresses

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4
Q

What does IP stand for?

A

Internet Protocol

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5
Q

What does an IP address do?

A

IP addresses are used by computers to identify each other on the network

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6
Q

What is a Top Level Domain?

A

The part of a website that goes after the last “.” (e.g. .com, .edu, .gov)

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7
Q

What is a second level domain name?

A

The second-to-last work in a domain name (optional)

e.g. the “co” in .co.uk

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8
Q

What does IANA stand for?

A

Internet Assigned Numbers Authority

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9
Q

How are top level domain names controlled?

A

They are controlled by IANA in a root zone database, which is a database of all available top level domains.

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10
Q

What is the key purpose of domain regristrars?

A

Ensuring that all names in a given domain are unique.

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11
Q

What does SOA stand for?

A

Start Of Authority Record

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12
Q

What info is contained in an SOA (Start of Authority)?

A
  • The name of the server that supplied data for the zone
  • Administrator of the zone
  • Current version of the data file
  • Default # of seconds for the TTL file on resource records
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13
Q

What does NS stand for?

A

Name Server Records

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14
Q

What is the purpose of an NS Record?

A

They are used by Top Level Domain servers to direct traffic to the Content DNS server which contains the authoritative DNS records.

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15
Q

What does the “A” stand for in “A” Record?

A

Address

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16
Q

What does an “A” Record do?

A

The A record is used by the computer to translate the name of the domain to an IP address

17
Q

In the context of DNS, why is TTL important?

A
  • TTL is the length of time that a DNS record is cached on either the Resolving Server or the user’s own local PC.
  • The lower the TTL, the faster changes to DNS records take to propogate throughout the internet.
18
Q

What does CName stand for?

A

Canonical Name

19
Q

What does a CName do?

A

A CNAME is used to resolve one domain name to another

(Imagine looking in the phone book for BATMAN -> See West, Adam)

20
Q

What is an Alias Record?

A

Alias Records are used to map resource record sets in your hosted zone to Elastic Load Balancers, CloudFront Distributions, or S3 buclets that are configured as websites.

21
Q

What is a naked domain name?

A

a DNS server name that doesn’t have the “www” or any other subdomains

22
Q

What is a zone apex record?

A

A DNS name that doesn’t have “www” or any of the other subdomains

23
Q

What is the key difference between an Alias Record and a CName?

A

While both are used to map a DNS name to another, CNames cannot be used for naked domain names

24
Q

Do Elastic Load Balances have pre-defined IPv4 addresses?

A

No, you resolve to them using a DNS name

25
Q

On the exam, given the choice between an Alias Record and a CName, which should you pick?

A

Alias Records (CNAMEs can’t handle zone apex records)

26
Q

What does the MX stand for in MX Record?

A

Mail Exchanger

27
Q

What does the PTR stand for in PTR Record?

A

Pointer

28
Q

At a high level, what does a PTR Record (Pointer Record) do?

A

Maps an IP address to a domain/host name

(Think inverse of an A record)

A DNS pointer record (PTR for short) provides the domain name associated with an IP address.

29
Q

Can you buy domain names directly from AWS?

A

Yes, but it can take up to 3 days to register depending on the circumstances.

30
Q

What are the common DNS types?

A
  1. SOA Records
  2. NS Records
  3. A Records
  4. CNAMES
  5. MX Records
  6. PTR Records
31
Q

What is the limit to the number of domain names you can manage using Route53?

A

default limit is 50 domain names, but this can be increased by contacting AWS Support

Fully Merged AWS SA Prep (52 decks)

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