Which DNS name can only be resolved within Amazon EC2?

A – WITHIN AWS

Hey !!!
Its Private DNS, Ans: D

D

http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-dns.html

it’s D

You can use the private DNS hostname for communication between instances in the same network, but we can’t resolve the DNS hostname outside the network that the instance is in.

D.

A private (internal) DNS hostname resolves to the private IPv4 address of the instance, and takes the form ip-private-ipv4-address.ec2.internal for the us-east-1 region, and ip-private-ipv4-address.region.compute.internal for other regions (where private.ipv4.address is the reverse lookup IP address). You can use the private DNS hostname for communication between instances in the same network, but we can’t resolve the DNS hostname outside the network that the instance is in.

http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-dns.html

A private (internal) DNS hostname resolves to the private IPv4 address of the instance

To view DNS hostnames for an instance using the console

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. In the navigation pane, choose Instances.

3. Select your instance from the list.

4. In the details pane, the Public DNS (IPv4) and Private DNS fields display the DNS hostnames, if applicable.

In the AWS documentation (Internal) is used in brackets which indicates that it is for clarification purposes, you can also see that in the console the address is under Private DNS

For this reason the anser is D

Guys, The Correct answer is A.

Amazon EC2 also provides an internal DNS name and a public DNS name that map to the private and public IP addresses, respectively. The internal DNS name can only be resolved within Amazon EC2. The public DNS name resolves to the public IP address outside the Amazon EC2 network, and to the private IP address within the Amazon EC2 network.

D.
Private DNS name

this is confusing. Even in AWS Documentation they are using both “Internal DNS hostname” and “Private DNS hostname” at different locations.

Here are the links:

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html

which says- ” When you launch an instance, we allocate a private IPv4 address for the instance using DHCP. Each instance is also given an internal DNS hostname that resolves to the private IPv4 address of the instance; for example, ip-10-251-50-12.ec2.internal. You can use the internal DNS hostname for communication between instances in the same network, but we can’t resolve the DNS hostname outside the network that the instance is in.”

http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-dns.html

which says – ” The Amazon DNS server can resolve private DNS hostnames to private IPv4 addresses for all address spaces, including where the IPv4 address range of your VPC falls outside of the private IPv4 addresses ranges specified by RFC 1918.

Important

If you created your VPC before October 2016, the Amazon DNS server does not resolve private DNS hostnames if your VPC’s IPv4 address range falls outside of the private IPv4 addresses ranges specified by RFC 1918. If you want to enable the Amazon DNS server to resolve private DNS hostnames for these addresses, contact AWS Support.”

Now i am confused..

D.
In the details pane, the Private DNS (IPv4) field displays the private DNS hostname.

Is private DNS hostname/name and internal DNS hostname/name different ?
private DNS hostname can be resolved by Route53 as well, so internal DNS hostname can ONLY be solved in EC2 ??

the question i guess is focus on ONLY.