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 ________.