Chapter 8 review questions

Question 1

To transmit and receive signals to and from multiple nodes in a three-story office building, what type of antenna should an access point use?

Answer 1

Omnidirectional

Question 2

which of the following is not true about multipath signaling?

Answer 2

Multipath signaling uses less energy and results in clearer reception than line-of-sight signaling.

Question 3

You are setting up a WLAN for an insurance agency. The network includes 32 clients, three printers, two servers, and a DSL modem for Internet connectivity. What type of WLAN architecture would best suit this office?

Answer 3

Infrastructure

Question 4

Which of the following 802.11 transmission requirements contributes to its inefficiency?

Answer 4

A destination node must issue an acknowledgment for every packet that is received intact.

Question 5

In the 802.11 standard, IEEE specifies what type of access method?

Answer 5

CSMA/CA

Question 6

Suppose a user on your office network has changed the channel on which his wireless NIC communicates. Assuming the wireless connection is his only access to the LAN, what will happen when he next tries to send an e-mail?

Answer 6

The e-mail program will respond with a message indicating it could not connect to the mail server.

Question 7

What frequency band is used by 802.11b, 802.11g, and 802.11n?

Answer 7

2.4 GHz

Question 8

Your office currently runs a mix of 802.11b and 802.11g clients. Rumor has it that your company is about to merge with another company that uses a different wireless
technology. Which of the following would be compatible with what your WLAN currently runs?

Answer 8

802.11n

Question 9

If your wireless stations are configured to perform passive scanning, what do they need from an access point to initiate association?

Answer 9

A beacon frame

Question 10

You’re working on a school district’s 802.11n WLAN. Within each school, several access points serve students, teachers, and administrators. So that users can move about the school with their laptops and not lose network connectivity, each of the access points must share which of the following?

Answer 10

The same ESSID

Question 11

When a mobile WLAN user roams from access point A’s range into access point B’s range, what does it do automatically to maintain network connectivity?

Answer 11

Reassociate with access point B

Question 12

Which two of the following techniques help to reduce overhead in 802.11n wireless transmission?
a. CSMA/CA
b. Asynchronous communication
c. Frame aggregation
d. Spread-spectrum signaling e. Channel bonding

Answer 12

c. Frame aggregation
d. Spread-spectrum signaling e. Channel bonding

Question 13

Your organization is expanding and plans to lease 3000 square feet of space in a nearby building. Your supervisor asks you to conduct a site survey of the space. If conducted properly, which of the following will your site survey reveal?

Answer 13

All of the above

Question 14

Which of the following wireless technologies boasts the highest maximum theoretical throughput?

Answer 14

LTE

Question 15

Which of the following will help an access point’s transmissions reach farther?

Answer 15

Boosting its signal strength

Question 16

hat part of a cellular network manages handoff?

Answer 16

The base station

Question 17

Suppose you work for a telecommunications carrier who is looking into providing WiMAX in a suburb of a large city. A colleague suggests that your company reserve licensed frequencies from the FCC for your service. Why?

Answer 17

Licensed frequencies will suffer less interference than unlicensed frequencies.

Question 18

On your Linux workstation, you open a terminal window and type at the command prompt iwconfig eth0 key 5c00951b22. What have you done?

Answer 18

Established the credentials the wireless interface will use to communicate securely with the access point

Question 19

As the network manager for a small business, you have been asked to evaluate high-speed, packet-switched wireless data services that your company’s users can use at their desks, in their cars, and at their homes within your metropolitan area. Which two of the following meet those criteria, and are therefore candidates for evaluation?
a. 802.11g
b. 802.11n
c. WiMAX 2
d. HSPA+
e. LTE

Answer 19

c. WiMAX 2
e. LTE

Question 20

Which of the following types of satellites is used to provide satellite data services?

Answer 20

a. Geosynchronous earth orbit

Question 21

Which of the following types of satellites is used to provide satellite data services?

Answer 21

a. Geosynchronous earth orbit