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NEW QUESTION: 1
What is the Cisco IOS command that is used to prevent the route of the incoming traffic from an unknown network?
A. Interface FastEthernet 0/0ip verify multicast source reachable-via any allow-default
B. Interface FastEthernet 0/0ip verify unicast destination reachable-via any allow-default
C. Interface FastEthernet 0/0ip verify unicast source reachable-via any allow-default
D. Interface FastEthernet 0/0ip verify multicast destination reachable-via any allow-default
Answer: C
Explanation:
Explanation/Reference:
answer is obvious.

NEW QUESTION: 2
ソリューションアーキテクトは、パブリックサブネットのAmazon EC2インスタンスでホストされるWebアプリケーションを設計しています。 Webアプリケーションは、プライベートサブネットでMySQLデータベースを使用します。データベース管理者がデータベースにアクセスできる必要があります。
アーキテクトが推奨するオプションは次のうちどれですか？ （2つ選択してください。）
A. Elastic IPアドレスをデータベースにアタッチします。
B. カスタマーサイトとVPCの間にIPSec VPNトンネルを作成し、VPNトンネルを使用してデータベースに接続します。
C. パブリックサブネットのWebサーバーにログインして、データベースに接続します。
D. パブリックサブネットに要塞ホストを作成し、要塞ホストを使用してデータベースに接続します。
E. SSHを使用してパブリックサブネットのNATゲートウェイに接続した後、DBメンテナンスを実行します。
Answer: B,D
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: 3
あなたは、会社の方針に違反するウェブサイトへのユーザアクセスをブロックする使命を帯びてきたが、サイトは、動的IPアドレスを使用します。問題を解決するために、URLフィルタリングのためのベストプラクティスは何ですか？
A. URLフィルタリングを有効にして唯一の企業ポリシーは、ユーザーがアクセスすることを可能にするウェブサイトを可能にするために、URLの分類を使用します。
B. URLフィルタリングを有効にして、企業のポリシーに違反するウェブサイトをブロックするためにホワイトリストを作成します。
C. URLフィルタリングを有効にして、企業のポリシーに違反するウェブサイトをブロックするURLカテゴリを使用しています。
D. URLフィルタリングを有効にして、会社の方針は、ユーザーがアクセスすることを可能にすることだけでウェブサイトを許可するホワイトリストを作成します。
E. URLフィルタリングを有効にして、企業のポリシーに違反するウェブサイトをブロックするためにブラックリストを作成します。
Answer: C
Explanation:
Each website defined in the URL filtering database is assigned one of approximately 60 different URL categories. There are two ways to make use of URL categorization on the firewall:
Block or allow traffic based on URL category --You can create a URL Filtering profile that specifies an action for each URL category and attach the profile to a policy. Traffic that matches the policy would then be subject to the URL filtering settings in the profile. For example, to block all gaming websites you would set the block action for the URL category games in the URL profile and attach it to the security policy rule(s) that allow web access.
See Configure URL Filtering for more information.
Match traffic based on URL category for policy enforcement --If you want a specific policy rule to apply only to web traffic to sites in a specific category, you would add the category as match criteria when you create the policy rule. For example, you could use the URL category streaming-media in a QoS policy to apply bandwidth controls to all websites that are categorized as streaming media. See URL Category as Policy Match Criteria for more information.
By grouping websites into categories, it makes it easy to define actions based on certain types of websites.
Source: https://www.paloaltonetworks.com/documentation/70/pan-os/pan-os/url-filtering/url-categories

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