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NEW QUESTION 27
Which DNS name can only be resolved within Amazon EC2?
- A. Internal DNS name
- B. Public DNS name
- C. Global DNS name
- D. External DNS name
Answer: A
Explanation:
Only Internal DNS name can be resolved within Amazon EC2.
Reference:
http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/using-instance-addressing.html
NEW QUESTION 28
A Solutions Architect is designing a web application that will be hosted on Amazon EC2 instances in a public subnet. The web application uses a MySQL database in a private subnet. The database should be accessible to database administrators. Which of the following options should the Architect recommend? (Select TWO.)
- A. Perform DB maintenance after using SSH to connect to the NAT Gateway in a public subnet.
- B. Attach an Elastic IP address to the database.
- C. Create an IPSec VPN tunnel between the customer site and the VPC, and use the VPN tunnel to connect to the database.
- D. Log in to the web servers in the public subnet to connect to the database.
- E. Create a bastion host in a public subnet, and use the bastion host to connect to the database.
Answer: C,E
Explanation:
Explanation
It is best practise to place your database servers into a private subnet. By definition a private subnet in Amazon Web Service (AWS) is not reachable from the internet. So there is no internet gateway assigned to it. With proper security groups configured you restrict the database access to that (web) servers which need access only.
But that configuration makes it more complicated for managing the database servers, e.g. connecting with SQL clients. Instead of putting your database instance into a public subnet you can configure a bastion host (aka jump box) for acting as an intermediate server. The following picture gives you a quick overview:
aws_architecture
You place a small EC2 instance (e.g. t2.nano) into a public subnet within your VPC. After that you can connect with e.g. Putty (for Windows) to establish a SSH connection and configure it to create an SSH tunnel for the database port.
Please note your security group settings. The bastion host has inbound access for port 22 and your source IP address only (or more which is not recommended). The security group for the RDS instance will allow inbound access for port 3306 (for MySQL) with restriction to the security groups which needs access to the database server (in our case the bastion host). With that configuration you limit the database access to the minimum needed.
Configuring Putty
At first enter the hostname with ec2-user. This is the public IP address of your bastion host:
putty1
After that you define your private key for authentication:
putty2
In the last step you enter the SSH tunnel settings for your database instance. In this example we create a tunnel for port 3306 on your local computer to port 3306 on the RDS instance host (DNS name). This is possible, because the bastion host and the database instance are placed within the same VPC and the routing table allows the communication between both subnets.
putty3
After establishing the putty connection we can connect to our database on localhost, port 3306:
dbweaver1
Making it more convenient …
This is all fine but we can do it even more convenient. One solution is to place all Putty settings into a batch file:
@ECHO OFF
SET PUTTY_EXE=C:\Putty\putty.exe
start %PUTTY_EXE% [email protected] -i d:\my_private_key.ppk -L
3306:demo.abc.eu-central-1.rds.amazonaws.com:3306
After saving it to a batch file we can start the SSH tunnel by a double-click.
Another solution depends on your SQL Client. In some clients like e.g. DBWeaver or the MySQL Workbench you can configure a TCP connection over SSH directly. With that option you can configure it all in that client.
No Putty configuration or batch file to be started.
mysql_workbench
Be sure to select “Standard TCP/IP over SSH” and the correct private key format.
NEW QUESTION 29
A company fails an AWS security review conducted by a third party. The review finds that some of the company’s methods to access the Amazon EMR API are not secure Developers are using AWS Cloud9, and access keys are connecting to the Amazon EMR API through the public internet Which combination of steps should the company take to MOST improve its security” (Select TWO)
- A. Set up each developer with AWS Secrets Manager to store access keys
- B. Set up a VPC peering connection to the Amazon EMR API
- C. Set up a NAT gateway to connect to the Amazon EMR API.
- D. Set up VPC endpoints to connect to the Amazon EMR API
- E. Set up 1AM roles to be used to connect to the Amazon EMR API
Answer: D,E
NEW QUESTION 30
……
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