MISC Chapter 6

service bands

2.4 GHz and 5 GHz are ________.

both 2.4 GHz and 5 GHz

802.11 standards are being developed to work in the ________ unlicensed band.

omnidirectional antenna

A cellular telephone uses a(n) ________.

None of these

A channel extends from 55 MHz to 60 MHz. Its bandwidth is ________.

spread spectrum

A channel has more bandwidth than is necessary given data transmission speeds requirements in ________ transmission.

BSS

A single access point and the set of hosts it serves is called a(n) ________.

2

A wireless host sends a packet to a server on the company's wired Ethernet LAN via an access point. How many frames will be involved in this one-way transmission?

the distribution system

Access points in the same ESS communicate via ________.

packets

Access points take ________ from wireless devices and send them on to devices on the wired LAN. They also do the converse.

both are connected to the same distribution system and have the same SSID

An extended service set (ESS) is a group of BSSs that ________.

about 6 mW

At 10 meters, a signal has a strength of 100 mW. About how strong will it be at 40 meters?

both direct power to individual clients and send signals to two different clients at the same time

Beamforming can allow an access point to ________.

Reliable

CSMA/CD+ACK is ________.

more bandwidth

Companies are moving to the 5 GHz band because there is ________ than in the 2.5 GHz band.

hertz

Frequency is measured in terms of ________.

they will communicate using 802.11n

If an 802.11n client tries to use an 802.11ac access point, ________.

individual throughput

If more users move to an access point, this decreases ________.

false

If two products both comply with 802.11 ac, they should have close to the same performance.

20 MHz

In 802.11g, channel bandwidth usually is ________.

always false

In CSMA/CD+ACK, when a wireless NIC wishes to transmit, it listens for traffic. If there is traffic, it waits. When the traffic stops, it may transmit immediately.

6

In the 5 GHz band, how many channels can you have with 802.11ac with 80 GHz channels?

you can use radios wherever you please

In unlicensed bands, ________.

increases throughput

MIMO ________.

transmits multiple signals in the same channel

MIMO _____________.

both access points and wireless hosts

Media access control governs transmission by ________.

only wireless devices

Mesh networking in 802.11 is likely to use ________.

spread over a range of frequencies

Signals in a transmission usually ________.

it is required by regulators

Spread spectrum transmission is used in WLANs because ________.

more reliable transmission

Spread spectrum transmission is used in WLANs for ________.

3

The 2.4 GHz band supports ________ possible non-overlapping 20 MHz channel(s).

12

The 5 GHz band usually supports about ________ non-overlapping 20 MHz channel(s).

CSMA/CA+ACK

The 802.11 standard has two mechanisms for media access control. One of two mechanisms is mandatory; it is ________.

to infinity

The frequency spectrum extends ________.

multipath interference

The most serious problem with wireless transmission in WLANs is ________.

802.11r

The standard for roaming among access points is ________.

1

There is an access point that serves eight wireless hosts. On how many channels will these devices transmit and receive during the course of an hour or two?

SSID

To connect to an access point, you must know its ________.

Channels

To handle multiple conversations in radio transmission, you normally use multiple ________.

Broadband

To transmit data very rapidly, you would want a ________ channel.

wide bandwidth

To transmit very rapidly in RADIO, you need ________.

802.11ac

Today, Wi-Fi sales are dominated by ________.

unlicensed bands

WLANs normally use ________.

802.11

We use the terms Wi-Fi and ________ interchangeably in this book.

They will interfere with each other.

What happens if two nearby access points use the same channel?

neither inverse square law attenuation nor electromagnetic interference

What propagation problem becomes worse as frequency increases?

802.11ac

Which of the following is the newest Wi-Fi standard?

802.11

Wi-Fi Standards come from the ________ Working Group.

increases transmission speed

Wider channel bandwidth ________.

servers on the wired network

Wireless access points typically link wireless clients to ________.

OSI

Wireless network standards are ________ standards.

the data link layer

Wireless network standards operate at ________.