14.9.5 Practice Questions
You want to configure a Windows workstation with your network proxy server's IP address from Control Panel using the Internet Properties window. Click on the tab in the Internet Properties window that you would use to do this.
> Connections Explanation: To configure the proxy server's IP address, go to Control Panel > Network and Internet > Internet Options. Click the Connections tab and then select LAN settings. In the dialog displayed, you can enable a proxy server for the LAN and then enter the proxy server's IP address and port number.
You connect your computer to a wireless network available at the local library. You find that you cannot access several websites on the internet. Which of the following is the MOST likely cause of this problem?
> A proxy server is filtering access to websites. Explanation: A proxy server can block internet access based on website or URL. Many schools and public networks use proxy servers to prevent access to websites with objectionable content. Ports 80 and 443 are used by HTTP to retrieve all web content. If a firewall were blocking these ports, access would be denied to all websites. Port forwarding directs incoming connections to a host on the private network. Port triggering dynamically opens firewall ports based on applications that initiate contact from the private network.
Which of the following functions are performed by proxy servers? (Select two.)
> Cache web pages. > Block employees from accessing certain websites. Explanation: A proxy, or proxy server, stands between client computers and web servers. You can use a proxy server to prevent access to specific websites or to cache (save) frequently used web pages. When a proxy receives a request from the client, the proxy checks to verify that the client is allowed access to the website. If they are, the proxy then checks its cache to see if the requested page is there. If the page is already cached, the proxy server fulfills the request by displaying the requested page from the cache rather than retrieving it from the internet. Receiving a web page from a local proxy server is much faster than downloading the page from the internet.
Which of the following proxy server roles stores frequently accesses data so that a user's request never has to leave the network for retrieval?
> Caching Explanation: Caching allows frequently accessed data to be stored on the local proxy server so that a user's request never has to leave the network for retrieval. A VPN allows users to connect to the internet anonymously. All the data is encrypted, and not even the ISP can see the contents of the traffic. The Sharing Internet Connections role allows all devices to be funneled through one connection, controlling the flow of network traffic. This is a good solution for wireless device connections over Wi-Fi. A firewall is a security system on a network that acts as a barrier between the network and the rest of the internet. A firewall is configured to block unwanted access and traffic that could cause security issues.
As a network administrator for your company, you want to set up a network device that manages traffic leaving and entering your network from the outside. Which of the following would BEST meet your requirements?
> Forward proxy server Explanation: A forward proxy server manages traffic leaving and entering your network from the outside. A reverse proxy server is placed between the servers and client machines internally to monitor traffic between them. A content filter is a role of a proxy server that is designed to block traffic by regulating incoming and outgoing connection requests. This prevents users from accessing websites they shouldn't have access to. A VPN (or website proxy) allows users to connect to the internet anonymously. All data is encrypted, and not even the ISP can see the contents of the traffic.
Two employees are unable to access any websites on the internet, but they can still access servers on the local network, including those residing on other subnets. Other employees are not experiencing the same problem. Which of the following actions would BEST resolve this issue?
> Identify the proxy server name and port number in Internet Options. Explanation: In this case, you should identify the proxy server name and port number in Internet Options. Windows automatically detects and uses a proxy server if one is on the network. If the proxy server is not detected, you should manually configure the proxy settings. Because other users are not experiencing the same problems, the filtering settings on the proxy server for specific internet sites are probably not the cause of the problem. If you bypass the proxy server, the clients are no longer managed by the proxy server. This is not a recommended solution. IP addresses assigned by APIPA force the client to the 169.254.0.0 subnet. This would prevent the client form accessing internal servers that use static IP addresses, especially those on different subnets.
You would like to control internet access based on user, time of day, and websites visited. Which of the following actions would BEST meet your criteria?
> Install a proxy server. Allow internet access only through the proxy server. Explanation: You should use a proxy server to control internet access based on user, time of day, and websites visited. You would configure these rules on the proxy server, and all internet access requests would be routed through the proxy server using these rules. You use a packet-filtering firewall, such as Windows Firewall, to allow or deny individual packets based on characteristics such as source or destination address and port number. You configure internet zones to identify trusted or restricted websites and to control the types of actions that can be performed when going to those sites.
An after-school care center allows children to browse the internet. They want to limit the websites that the children can access. Which of the following network hosts would MOST likely provide this service?
> Proxy server Explanation: One function of a proxy server is to intercept requests from a client browser and either forward them on to the internet or deny access to that request. A print server manages network printers and makes them available to computers throughout the network. Print jobs are sent to the print server instead of directly to the printer. A web server offers web pages to clients. Many organizations have their own web server that is accessible from the internet or from the internal network. A DHCP server leases IP addresses to client computers when they first connect to the network.
As a network administrator for your company, you want to set up a network device that manages internal traffic between servers and clients. Which of the following would BEST meet your requirements?
> Reverse proxy server Explanation: A reverse proxy server is placed between the servers and client machines internally to monitor traffic between them. A forward proxy server manages traffic that is leaving and entering the network from the outside. A content filter is a role of a proxy server that is designed to block traffic by regulating incoming and outgoing connection requests. This prevents users from accessing websites they shouldn't have access to. A VPN (or website proxy) allows users to connect to the internet anonymously. All data is encrypted, and not even the ISP can see the contents of the traffic.
Which of the following proxy server roles allows users to connect to the internet anonymously with their data encrypted during transmission?
> VPN Explanation: A VPN allows users to connect to the internet anonymously. All the data is encrypted, and not even the ISP can see the contents of the traffic. Caching allows frequently accessed data to be stored on the local proxy server so that a user's request never has to leave the network for retrieval. The Sharing Internet Connections role allows all devices to be funneled through one connection, controlling the flow of network traffic. This is a good solution for wireless device connections over Wi-Fi. A firewall is a security system on a network that acts as a barrier between the network and the rest of the internet. A firewall is configured to block unwanted access and traffic that could cause security issues for the network.
