Networking Chapter 3 Homework You Can Now Disconnect Computer From The

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The operating system confirms that the DNS resolver cache has been flushed. One

circumstance in which you might want to empty a client’s DNS cache is if the client

4. View the DNS cache again with the command: ipconfig /displaydns

Because you just emptied the DNS cache, you see a message indicating that Windows

could not display the DNS resolver cache. (See Figure 3-33.)

5. Open a browser window and go to cengage.com. Next, go to google .com.

Finally, go to loc.gov.

6. Return to the Command Prompt window and view the DNS cache containing the

new list of resource records using this command: ipconfig /displaydns

7. Scroll up through the list of resource records and note how many associations

were saved in your local DNS cache after visiting just three websites. How many

hosts are identified for each site you visited? What type of record is most

common? What other situations can you think of, other than wanting to reach a

host that has moved to a different address, in which you might want to clear your

DNS cache?

By default, DHCP supplies the IP addresses of DNS servers when you first connect to a

network. When traveling, you can still use your organization’s DNS servers, even when

they are far away from your laptop. Doing so means you don’t have to rely on DNS

servers provided by a public hot spot, which might be controlled by hackers.

Follow these steps to view or change the name server information on a Windows 10

workstation:

8. Open the Network and Sharing Center and click Change adapter settings.

9. Right-click the connection you want to configure, and click Properties on the

shortcut menu. Respond to the UAC box if necessary.

10. On the Networking tab under This connection uses the following items, select

11. To change the default settings and specify the DNS server for your workstation,

12. Enter the IP address for your primary DNS server in the Preferred DNS server

space and the address for your secondary DNS server in the Alternate DNS server

13. Now that you have changed your DNS servers, do you still have DNS data stored

in your DNS cache? To find out, return to the Command Prompt window and

view the DNS cache to see what records are still there. Then close all windows,

saving your changes.

Project 3-4: Create a NAT Translation Table Entry

Your corporation hosts a website at the static public IP address 92.110.30.123. A router

directs this traffic to a web server at the private IP address 192.168.11.100. However, the

web server needs a hardware upgrade and will be down for two days. Your network

administrator has asked you to configure the router so that requests to the IP address

92.110.30.123 are redirected to the backup server for the website, which has the private

IP address 192.168.11.110. The router’s inside Ethernet interface uses IP address

192.168.11.254 and its outside interface uses the IP address 92.110.30.65. Answer the

following questions about the new static route you’ll be creating:

1. What is the router’s outside interface IP address?

2. What is the router’s inside interface IP address?

3. What is the website’s public IP address?

4. What is the private IP address of the backup Web server?

Use the example given in Figure 3-12 earlier in the chapter as a template to create the

NAT translation table entries for the address translation. For the subnet masks, use the

default subnet mask for a Class C IP address license. Include appropriate comment lines

in your table.

Answer:

Capstone Projects

Capstone Project 3-1: Set Up an FTP Server

In this project, you return to the small network you created in Chapter 1, Project 1-1.

You’ll install and use FTP. Recall that FTP is a client-server application in which the first

computer, the client, requests data or a service from the second computer, the server.

Designate one computer as computer A, the server, and the other computer as computer

B, the client. Do the following using computer A:

1. Create a folder named Normal Users and create a file in the folder named

2. Connect Computer A to the Internet so you can get the FileZilla software. Go to

4. After the installation is complete, the Enter server to administrate dialog box

appears (see Figure 3-34). Enter an administration password and be sure to record

this password in a Secure Note, using the Server type, in your LastPass account.

5. Because you’re running only one FTP server on computer A, check the Always

connect to this server check box. When you click Connect, the FileZilla Server

6. You’re now ready to configure your FTP server. To set up a user group, click

7. In the left pane, under Page, click Shared folders.

9. Under Directories, select the Normal Users directory and then click Set as home

10. Next, click Edit, Users, and create a new user named User1. Put the user in the

11. In the Account settings pane, check Password and assign the password

12. To verify the service is working, let’s use the FTP client commands embedded in

Windows on Computer A. As you work, watch the dialogue recorded in the

13. In the FileZilla Server window, click Edit, then click Settings. Under General

14. The server software is still running as a background service, listening at port 21

for clients to initiate a session. To see the service running, open the Windows

15. To find out the IP address of computer A, in the Command Prompt window, enter

ipconfig. What is the IP address?

16. Open a Command Prompt window and ping computer A. Theoutput should show

17. Now try the same commands as in step 12, using the IP address of computer A in

the first command line. Most likely, you will not be able to connect because the

On computer A, do the following to open port 21:

18. In the Network and Sharing Center, click Windows Firewall. In the Windows

Firewall window, click Advanced settings. In the left pane, click Inbound Rules

On computer B, you should now be able to open an FTP session with computer A. Do the

following:

19. Using the commands listed in step 12 and the IP address of computer A, open the

session and verify you can see the contents of the shared folder. If you see a

Windows Security Alert, allow access. You might have to restart the session to try

Capstone Project 3-2: Install and Use WSL (Windows Subsystem for

Linux)

WSL runs on any 64-bit Windows 10 system with the Anniversary Update (version 1607)

or later. You must first turn on Developer Mode, and then enable the Windows

Complete the following steps to enable Windows Subsystem for Linux and install Ubuntu

Bash on a Windows 10 system:

1. First, turn on Developer Mode.

a. Open the Settings app and click Update & security. In the left pane, scroll

2. Enable Windows Subsystem for Linux.

a. Open Control Panel and click Programs and Features. In the left pane,

click Turn Windows features on or off.

3. Now that you have enabled Windows Subsystem for Linux, you can install a version

of Linux designed to run on Windows. This version is called Bash on Ubuntu on

Windows. To install and run Bash on Ubuntu on Windows from the command

prompt, do the following:

a. Open a Command Prompt window and enter the command bash (see Figure

b. Enter y to accept the installation terms. Bash on Ubuntu on Windows

downloads from the Windows Store, and then is extracted and installed. This

might take several minutes.

c. Enter a new UNIX username at the prompt. This username can be different

d. Enter a password at the next prompt. The cursor will not move as you type the

password. Re-enter the password at the next prompt. Add this information as a

Secure Note in your LastPass vault.

e. After the installation is complete, Windows switches to the Bash on Ubuntu

on Windows environment with its shell prompt within the Command Prompt

f. You can continue to interact with Bash on Ubuntu on Windows from the

Command Prompt window, or you can open Bash on Ubuntu on Windows in

At this point, many of the Linux commands you have become familiar with will work as