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NEW QUESTION: 1
Solutions Architect는 퍼블릭 서브넷의 Amazon EC2 인스턴스에서 호스팅 될 웹 애플리케이션을 설계하고 있습니다. 웹 애플리케이션은 프라이빗 서브넷에서 MySQL 데이터베이스를 사용합니다. 데이터베이스는 데이터베이스 관리자가 액세스 할 수 있어야 합니다.
Architect가 권장해야 하는 다음 옵션은 무엇입니까? (2 개를 선택하십시오.)
A. 고객 사이트와 VPC간에 IPSec VPN 터널을 생성하고 VPN 터널을 사용하여 데이터베이스에 연결하십시오.
B. 퍼블릭 서브넷의 웹 서버에 로그인하여 데이터베이스에 연결하십시오.
C. SSH를 사용하여 퍼블릭 서브넷의 NAT 게이트웨이에 연결 한 후 DB 유지 관리를 수행하십시오.
D. 탄력적 IP 주소를 데이터베이스에 연결하십시오.
E. 퍼블릭 서브넷에 요새 호스트를 생성하고 요새 호스트를 사용하여 데이터베이스에 연결하십시오.
Answer: A,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: 2
マスター登録解除とは何ですか?
A. 購読者がアカウントから送信されたすべてのメールの購読を解除したとき
B. サブスクライバーがSalesforce Marketing Cloudから送信されたすべてのメールの購読を解除したとき
C. 購読者が購読センターのリストから購読を解除するとき
D. 購読者が電子メール購読解除リンクを介して出版物リストから購読解除する場合
Answer: A
NEW QUESTION: 3
What is the potential drawback to leaving VLAN 1 as the native VLAN?
A. Gratuitous ARPs might be able to conduct a man-in-the-middle attack.
B. It may be susceptible to a VLAN hopping attack
C. The CAM might be overloaded, effectively turning the switch into hub.
D. VLAN 1 might be vulnerable to IP address spoofing
Answer: B
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