Ch9 DNS and Route 53 Flashcards
Which type of record is commonly used to route traffic to an IPv6 address? A. An A record B. A CNAME C. An AAAA record D. An MX record
C. An AAAA record is used to route traffic to an IPv6 address, whereas an A record is used
to route traffic to an IPv4 address.
Where do you register a domain name? A. With your local government authority B. With a domain registrar C. With InterNIC directly D. With the Internet Assigned Numbers Authority (IANA)
B. Domain names are registered with a domain registrar, which then registers the name
to InterNIC.
You have an application that for legal reasons must be hosted in the United States when
U.S. citizens access it. The application must be hosted in the European Union when
citizens of the EU access it. For all other citizens of the world, the application must be
hosted in Sydney. Which routing policy should you choose in order to achieve this?
A. Latency-based routing
B. Simple routing
C. Geolocation routing
D. Failover routing
C. You should route your traffic based on where your end users are located. The best
routing policy to achieve this is geolocation routing.
Which type of DNS record should you use to resolve an IP address to a domain name? A. An A record B. A C Name C. An SPF record D. A PTR record
D. A PTR record is used to resolve an IP address to a domain name, and it is commonly
referred to as “reverse DNS.”
You host a web application across multiple AWS regions in the world, and you need to
configure your DNS so that your end users will get the fastest network performance
possible. Which routing policy should you apply?
A. Geolocation routing
B. Latency-based routing
C. Simple routing
D. Weighted routing
B. You want your users to have the fastest network access possible. To do this, you would
use latency-based routing. Geolocation routing would not achieve this as well as latency-
based routing, which is specifically geared toward measuring the latency and thus would
direct you to the AWS region in which you would have the lowest latency.
Which DNS record should you use to configure the transmission of email to your intended mail server? A. SPF records B. A records C. MX records D. SOA record
C. You would use Mail eXchange (MX) records to define which inbound destination mail
server should be used.
Which DNS records are commonly used to stop email spoofing and spam? A. MX records B. SPF records C. A records D. C names
B. SPF records are used to verify authorized senders of mail from your domain.
You are rolling out A and B test versions of a web application to see which version results
in the most sales. You need 10 percent of your traffic to go to version A, 10 percent to go
to version B, and the rest to go to your current production version. Which routing policy
should you choose to achieve this?
A. Simple routing
B. Weighted routing
C. Geolocation routing
D. Failover routing
B. Weighted routing would best achieve this objective because it allows you to specify
which percentage of traffic is directed to each endpoint.
Which DNS record must all zones have by default? A. SPF B. TXT C. MX D. SOA
D. The start of a zone is defined by the SOA; therefore, all zones must have an SOA
record by default.
Your company has its primary production site in Western Europe and its DR site in the
Asia Pacific. You need to configure DNS so that if your primary site becomes unavailable,
you can fail DNS over to the secondary site. Which DNS routing policy would best
achieve this?
A. Weighted routing
B. Geolocation routing
C. Simple routing
D. Failover routing
D. Failover-based routing would best achieve this objective.
Which type of DNS record should you use to resolve a domain name to another domain name? A. An A record B. A CNAME record C. An SPF record D. A PTR record
B. The CNAME record maps a name to another name. It should be used only when there
are no other records on that name.
Which is a function that Amazon Route 53 does not perform? A. Domain registration B. DNS service C. Load balancing D. Health checks
C. Amazon Route 53 performs three main functions: domain registration, DNS service,
and health checking.
Which DNS record can be used to store human-readable information about a server,
network, and other accounting data with a host?
A. A TXT record
B. An MX record
C. An SPF record
D. A PTR record
A. A TXT record is used to store arbitrary and unformatted text with a host.
Which resource record set would not be allowed for the hosted zone example.com ? A. www.example.com B. www.aws.example.com C. www.example.ca D. www.beta.example.com
C. The resource record sets contained in a hosted zone must share the same suffix.
Which port number is used to serve requests by DNS? A. 22 B. 53 C. 161 D. 389
B. DNS uses port number 53 to serve requests.
