Networking Chapter 6 Homework Wifi Answer Infrared Which Bluetooth Class Has

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Chapter 6

Wireless Networking

Applying Concepts: Examine Wireless Security Settings

Now that you understand some of the security options available for a wireless network

connection, let’s explore how to check the current settings on your AP and change them if

necessary.

Using a Windows 10 computer that is connected to a local network via Wi-Fi, complete the

following steps:

2. Under View your active networks, click the Wi-Fi connection, then click Wireless

3. In the Wireless Network Properties dialog box, look for the following information

on both the Connection and the Security tabs.

a. What are the network’s Name and SSID?

b. Is the connection configured to connect automatically when the wireless

network is in range?

c. What are the network’s Security and Encryption types?

Applying Concepts: Wi-Fi Analyzer on Your Smartphone

You can turn your smartphone into a Wi-Fi analyzer by installing a free or inexpensive app

through your phone’s app store. These days, such apps are easy to find, easy to use, and

provide useful information without much hassle. In this project, you install a Wi-Fi

analyzer app on your phone and try it out on your home or school Wi-Fi network. These

instructions are specific to an Android smartphone installing the Wifi Analyzer app, but

you can adjust the steps to work for other smartphones and different apps.

1. On an Android smartphone, go to the Play Store and search for the app called Wifi

3. At the time of this writing, the Wifi Analyzer is programmed to automatically start

scanning for Wi-Fi signals. It provides a live feed of signal strength and channel

coverage for the wireless networks in its reach. You can see in Figure 6-33 that

several home networks were available at the time of the scan, with several of these

using various overlapping channels. The local networks provided the strongest

signals.

Wireless networks perform best when using channels not used by nearby networks. For this

reason, it’s best to program the network for channels at the beginning, center, and end of

the channel bandwidth. For example, recall that 2.4-GHz-band devices offer up to 14

channels, although most only offer 11 channels, especially in the United States. In the

United States, then, neighboring Wi-Fi networks typically use channels 1, 6, and 11 in

If your wireless network is programmed for the same channel as your neighbor’s wireless

network, you will get better performance if you change your network’s channel to part of

the channel range not currently in use in your vicinity.

4. What channel is your network programmed to?

5. The Wifi Analyzer app provides some interesting features, including a signal meter,

as shown on the left side of Figure 6-34, and a list of other hosts on the

smartphone’s LAN, as shown on the right side of Figure 6-34. Notice in the list of

LAN neighbors that device MAC addresses and manufacturers are also listed. Take

a few minutes to explore your wireless analyzer app’s features. What features and

information did you find? What changes might you want to make to your Wi-Fi

network’s settings to increase its performance or security?

[[Insert Figure 6-34 here]]

Applying Concepts: Snail-Speed Wi-Fi

Your company recently rented new office space across town to make room for expansion in

the Accounting Department, and part of your responsibility with the new acquisition was to

install three new 802.11ac APs. You completed the job just before the weekend, at the

same time as the 19 accounting employees finished setting up their file cabinets and

reception area furniture. Some of your fellow IT technicians completed workstation setup

At first, the new location’s network seems to be working fine. The local network is

communicating well with the home office’s network, and everyone has access to all the

files they need on the file servers. As everyone gets settled in for the day and starts their

Monday duties, however, the network slows to a snail’s pace. It’s not long before you start

to get complaints about emails being delayed, files not being accessible, and print jobs to

successful, sometimes they aren’t. You know the APs are all new devices, and you double-

check their configurations to try to determine a common source for all the problems you’ve

noted. Here’s a summary of the results you’ve gathered:

• All three APs are active and communicating successfully with your laptop.

• All three APs are configured with identical SSIDs and other settings.

Why are wireless transmissions being lost in transit? Below are several possible

resolutions. Select the best one and explain your reasoning:

a. One of the APs is faulty and not processing transmissions. It should be removed and

replaced.

b. The NICs in the employees’ workstations were damaged during the move. Probably

several just need to be reseated while some might need to be replaced.

c. The APs should not have the same SSID. Rename each AP so their SSIDs don’t match.

d. Three APs are insufficient for the wireless load of the Accounting Department. More

APs should be added.

e. The APs are all part of the same LAN and should be separated into separate LANs.

f. The workstation computers are programmed to search for and connect with the wrong

SSID, or the network keys are entered wrong. Every workstation’s wireless interface

settings should be checked.

g. The APs are all programmed to use the same channel. They should be programmed for

different channels.

Review Questions

1. What is the lowest layer of the OSI model at which wired and wireless

transmissions share the same protocols?

a. Layer 4

b. Layer 3

c. Layer 2

d. Layer 1

2. What technology does Bluetooth use to take advantage of the 79 channels allocated

to the Bluetooth band?

a. ZigBee

b. DSSS

c. RTS/CTS

d. FHSS

3. Which one of the following wireless transmission types requires a clear LOS to

function?

a. Bluetooth

b. NFC

c. Infrared

d. Wi–Fi

4. Which Bluetooth class has the highest power output?

a. Class 1

b. Class 2

c. Class 3

d. They all have equal power output

5. A hacker takes advantage of an open Bluetooth connection to send a virus to a

user’s smartphone. What kind of security breach has occurred?

a. Data breach

b. Bluejacking

c. War driving

d. Bluesnarfing

6. A user swipes her smartphone across a tag on a poster to obtain showtimes for a

movie she wants to see later that evening. What wireless technology transmitted the

data?

a. NFC

b. Bluetooth

c. Z-Wave

d. ANT+

7. Which 802.11 standard functions in both the 2.4-GHz and 5-GHz bands?

a. 802.11g

b. 802.11ac

c. 802.11b

d. 802.11n

8. Which Carrier Sense technology is used on wireless networks to reduce collisions?

a. CSMA/CD

b. 802.11

c. CSMA/CA

d. SSID

9. You’ve just completed a survey of the wireless signals traversing the airspace in

your employer’s vicinity, and you’ve found an unauthorized AP with a very strong

signal near the middle of the 100-acre campus. What kind of threat do you need to

report to your boss?

a. Rogue AP

b. War driving

c. Bluesnarfing

d. Hidden node

10. You just settled in for some study time at the local coffee shop, and you pause long

enough to connect your smartphone to the Wi-Fi so you can listen to some music

while you study. As you’re about to sign in, you realize that you clicked on an SSID

called “Free Coffee and Internet.” What kind of security trap did you almost fall

for?

a. Guest network

b. Bluejacking

c. Evil twin

d. Brute force attack

11. To exchange information, two antennas must be tuned to the same __________.

12. Which kind of antenna is used in a point-to-point link, especially over long

distances?

13. When a wireless signal encounters a large obstacle, what happens to the signal?

14. Signals traveling through areas in which many wireless communications systems

are in use will exhibit a lower _______________ due to the higher proportion of

noise.

15. Which Wi-Fi frequency band offers 24 unlicensed communications channels in the

United States?

16. Why do wireless networks experience a greater reduction in throughput compared

with wired networks?

17. Which IoT wireless standard is used to sync data from a smartwatch, bike

computer, and smart phone to a single user account?

18. 802.11ac provides an advantage over 802.11n by incorporating increased channel

bonding capabilities. What size channels does 802.11ac support?

19. What feature of a site survey maps the Wi-Fi signals and other noise in your

location?

20. You’re setting up a home network for your neighbor, who is a music teacher. She

has students visiting her home regularly for lessons and wants to provide Internet

access for their parents while they’re waiting on the children. However, she’s

concerned about keeping her own data private. What wireless feature can you

configure on her AP to meet her requests?

Hands-On Projects

Project 6-1: Configure a SOHO Router

In this project, you configure a SOHO router, which includes routing, switching, wireless

access functions, and other network services in a single device. Configuration steps on

various SOHO wireless connectivity devices differ, but they involve a similar process and

require you to modify the same variables. Always follow the directions of the manufacturer

rather than the general directions given here.

This project assumes that the router is brand new or that it has been reset so any previous

1. Connect the computer to the router with a patch cable plugged into a network

(Ethernet) port on the router (see Figure 6-37). Then plug the router into a power outlet

and turn it on.

3. Firmware on the router (which can be flashed for updates) contains a configuration

program that you can access using a web browser from anywhere on the network. In

your browser address box, type the IP address of the router (for many routers, that

address is 192.168.1.1) and press Enter. Sign in using the default admin username and

password. For our router, the default username and password are both admin, although

yours might be different. What is the IP address and sign-in information for your

router?

4. The main setup page appears. The setup program will take you through the process of

configuring the router. After you’ve configured the router, you might have to turn your

cable or DSL modem off and then turn it back on so that it correctly syncs up with the

router. Figure 6-38 shows the main page for a router that has already been configured.

For most situations, the default settings on this and other pages should work without

any changes. What basic steps did the setup program have you follow to configure the

router?

5. It’s extremely important to protect access to your network and prevent others from

hijacking your router. If you have not already done so, change the default password so

that others cannot change your router setup. In Figure 6-38, the BASIC tab is selected.

Most of the settings you’ll want to adjust are on the ADVANCED tab for this router.

To change the password on the router shown in the figure, you would click

ADVANCED, Administration, and Set Password. What are the steps for your router?

Record your new router password in your LastPass vault along with any other helpful

information about your router, such as its management IP address.

6. Spend some time examining the various features of your router. If you make any

changes, be sure to save them. What is the public IP address of the router on the ISP

network? Why is it necessary for the router to have two IP addresses? When finished,

you can sign out now or stay signed in for the next project.

Project 6-2: Modify SOHO Router Settings for Wireless Connections

Now that you have installed your new SOHO router, you’re ready to modify its

configuration through the administrator interface. This project picks up where Project 6-1