IST 2
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?
1
CAT 5e and CAT 6 wiring can carry Ethernet traffic 100 meters up to ________.
1 Gbps
The 5 GHz band usually supports about ________ non-overlapping 20 MHz channel(s).
12
The maximum length for the data area of a frame is how many bytes?
1500
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?
2
In 802.11g, channel bandwidth usually is ________.
20 MHz
What is the maximum power for POE Plus in the standard?
25 watts
The 2.4 GHz band supports ________ possible non-overlapping 20 MHz channel(s).
3
What type of copper wiring is widely used in Ethernet?
4-pair UTP
In the 5 GHz band, how many channels can you have with 802.11ac with 80 GHz channels?
6
We use the terms Wi-Fi and ________ interchangeably in this book
802.11
Wi-Fi Standards come from the ________ Working Group.
802.11
Which of the following is the newest Wi-Fi standard discussed in the text book?
802.11ac
Which of the following only operates in the 5 GHz band?
802.11ac
The standard for roaming among access points is ________.
802.11r
The 802.11 standard for mesh networking is ________.
802.11s
The protocol standard for VLANs is
802.1q
What 802 Working Group creates Ethernet standards?
802.3
According to the textbook, which light wavelength dominates in LANs?
850 nm
A single access point and the set of hosts it serves is called a(n) ________.
BSS
Given the following information, Switch 1 Host A connected on port 15 and is on VLAN 42 Host B connected on port 10 is on VLAN 27 Trunk link connected on port 25 to Switch 2 Switch 2 Host C connected on port 3 is on VLAN 27 Host D connected on port 5 is on VLAN 27 Host E connected on port 6 is on VLAN 42 Trunk link connected on port 32 to Switch 1 Which host or hosts can Host B communicate with?
C, D
The 802.11 standard has two mechanisms for media access control. One of two mechanisms is mandatory; it is ________.
CSMA/CA+ACK
Which of the following is more efficient and faster?
CSMA/CA+ACK
What organization CREATES Ethernet standards? (Give the most specific answer.)
IEEE
Ethernet addresses were FORMERLY called ________ addresses but are now called ___________.
MAC, EUI-48
________ is a technique for preventing two wireless stations from transmitting at the same time and therefore interfering with each other.
Media access control
According to the textbook, which of the following is used most heavily in LANs for fiber transmission links?
Multimode fiber
An access point can transmit to more than one wireless client at a time with ________.
Multiuser MIMO
Wireless network standards are ________ standards.
OSI
Ethernet UTP terminates in a(n) ________ connector.
RJ-45
In ________, when a wireless host wishes to send, it first sends a message to the wireless access point asking for permission to send. When the access point sends back a response, the host sending the original message may transmit. All other hosts must wait.
RTS/CTS
To use an access point, you need to know its ________.
SSID
What happens if two nearby access points use the same channel?
They will interfere with each other.
If an uplink from switch to switch is forwarding traffic on multiple VLAN's, we call this uplink a _____.
Trunk
In LANs, ________ typically is for ________.
UTP, access lines
Select the correct wire map for the EIA/TIA 586B standard, with the connector's tab down and the contacts facing up and away from you.
White/Orange, Orange, White/Green, Blue, White/Blue, Green, White/Brown, Brown
________ have SSIDs.
Wireless access points
The other wireless device is far away in a known direction. It would be better to use ________.
a dish antenna
An Ethernet switch knows ________.
a list of unique EUI-48 addresses and their associated port number
In digital signaling there is (are) ________ state(s).
a small number of
At 10 meters, a signal has a strength of 40 mW. About how strong will it be at 20 meters?
about 10 mW
What propagation problem is especially bad in moist air?
absorptive attenuation
An extended service set (ESS) is a group of BSSs that ________.
are connected to the same distribution system and have the same SSID
Which of the following is relatively immune to small errors?
binary signaling
The Ethernet data field contains ________.
both a packet and the LLC subheader
Which UTP quality levels can send signals at 10 gigabits per second?
both category 6 and category 6A
Beamforming can allow an access point to ________.
both direct power to individual clients and send signals to two different clients at the same time
Under the standard, Ethernet switches can provide enough power over UTP for ________.
both wireless access points and voice over IP telephones
Channels with wide bandwidths are called ________ channels.
broadband
To transmit data very rapidly, you would want a ________ channel.
broadband
Which UTP quality levels are needed to send signals 100 meters at 10 gigabits per second?
category 6A
To handle multiple conversations in radio transmission, you normally use multiple ________.
channels
Using VLANs can reduce _______
congestion
In optical fiber, light travels through the ________.
core
What type of switch connects switches to other switches?
core switches
The Ethernet length field gives the length of the ________.
data field
Ethernet standards are specified at the ________ layer.
data link
Link aggregation can increase trunk speed by a factor of ________.
depends on the number of links you aggregate
The purpose of LLC subheader is to ________.
designate the type of packet in the data field
If an Ethernet receiver detects an error in an arriving frame, it ________.
drops the frame
Optical fiber cords use two strands ________.
for full-duplex transmission
Wireless radio transmission speed is usually measured in terms of ________.
frequency
Optical fiber's main advantage over UTP is ________.
greater distance span
In a ________ topology, there is only one possible path between any two hosts.
hierarchical
Switches in an Ethernet LAN are organized in a ________ topology.
hierarchical
If more users move to an access point, this decreases ________.
individual throughput
Spread spectrum transmission is used in WLANs because ________.
it is required by regulators
Ethernet becomes the dominant of LAN technology primarily because of its ________.
low cost, compared with competing technologies
Companies are moving to the 5 GHz band because there is ________ than in the 2.4 GHz band.
more bandwidth
Modal dispersion limits transmission distance in ________.
multimode fiber
The most serious problem with wireless transmission in WLANs is ________.
multipath interference
Ethernet's hierarchical topology makes it ________.
neither expensive nor reliable
A channel extends from 55 MHz to 60 MHz. Its bandwidth is ________.
none of the above
What propagation problem becomes worse as frequency increases?
none of these
A cellular telephone uses a(n) ________.
omnidirectional antenna
A local area network operates ________.
on a customer premises
Access points take ________ from wireless devices and send them on to devices on the wired LAN. They also do the converse. (CAREFUL)
packets
Ethernet standards are specified at the ________ layer.
physical
Ethernet usually has a 100 meter distance limit for ________.
physical links
UTP categories rate the ________ of UTP cabling.
quality
CSMA/CD+ACK is ________.
reliable
Using VLANs can increase _______
security
Wireless access points typically link wireless clients to ________.
servers on a wired network
Like FM radio and Broadcast TV, in WLANs 2.4 GHz and 5 GHz are ________.
service bands
What propagation problem becomes worse as there is a large and dense object between sender and receiver?
shadow zones or dead zones
Physical layer standards govern ________.
signaling
The longest transmission distances are possible with ________.
single-mode fiber
Signals in a transmission usually ________.
spread over a range of frequencies
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________.
terminal crosstalk interference
Wireless network standards operate at ________.
the data link layer
Access points in the same ESS communicate via ________.
the distribution system
If an 802.11n client tries to use an 802.11ac access point, ________.
they will communicate using 802.11n
The frequency spectrum extends ________.
to infinity
MIMO ________.
transmits multiple signals in the same channel
In LANs, optical fiber typically is used in ________.
trunk lines
In binary signaling there is (are) ________ state(s).
two
WLANs normally use ________.
unlicensed bands
Which of the following can increase reliability considerably in an Ethernet LAN?
using the Rapid Spanning Tree Protocol
What type of switch connects users to the network
workgroup switches
In unlicensed bands, ________.
you can use radios wherever you please
