Chapter 8 - Installing Wireless and SOHO Networks

Question 1

packets collide, and the sender will need to wait a period of time. what is that time called?

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Answer 1

back-off time

Question 2

in the original 802.11 standard, there are two spectrums used for encoding. what are they?

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Answer 2

FHSS - frequency hopping spread spectrum

DSSS - direct sequence spread spectrum

Question 3

there are 4 main 802.11 standards. tell me their name, modulation type, frequency, and max data rate

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Answer 3

a - OFDM, 5 GHz, 54 Mbps
b - DSSS, 2.4 GHz, 11 Mbps
g - both, 2.4 GHz, 54 Mbps
n - both, both, 600 Mbps

Question 4

in 802.11, the most common connectivity devices are what?

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Answer 4

wireless routers

wireless access point

Question 5

you are dealing with the wireless encryption WEP.
what kind of key does it use? (carpet)
how many hexadecimal characters long is the key?

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Answer 5

a static key

10, 26, or 58 hexadecimal characters long

Question 6

WPA uses TKIP. what is it and how does it work?

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Answer 6

temporal key integrity protocol

uses a 128 bit dynamic per packet key (makes new key for each packet)

Question 7

WPA2 improves upon WPA. most notably, it uses a special protocol based on the AES algorithm. what is that protocol and why was it created?

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Answer 7

CCMP, created to address the shortcomings of TKIP

Question 8

what does SOHO stand for?

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Answer 8

small office home office

Question 9

internet connections can be broadly broken up into two categories. what are they?

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Answer 9

dial-up

broadband

Question 10

there are two types of broadband. tell me what they are.

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Answer 10

DSL (digital subscriber line)

Cable

Question 11

what is ISDN?

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Answer 11

Integrated Services Digital Network

digital point to point network capable of maximum transmission speeds of about 2 Mbps

Question 12

tell me 3 advantages of ISDN

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Answer 12

connection is faster than dial up
runs over phone lines
its flexible (voice and data)

Question 13

what is the fiber optic option offered by Verizon to home subscribers?

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Answer 13

FiOS

Question 14

what’s the max speed for fiber to the node service?

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Answer 14

25 Mbps

Question 15

true or false: satellite internet requires a clear line of sight

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Answer 15

true

Question 16

there are two major cell standards in the united states. tell me what they are and whether or not they are compatible.

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Answer 16

global system for mobile communications (most popular)
code division multiple access (only available in US)

NOT compatible

Question 17

give me two examples of a 4G technology

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Answer 17

WiMAX

LTE

Question 18

give me 4 examples of ethernet standards that operate at 10Gbps

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Answer 18

10GBaseT
10GBaseSR
10GBaseLR
10GBaseER

Question 19

of the 4 802.11 standards, which one has the longest outdoor range and what is that range?

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Answer 19

n - can go 250 meters

Question 20

bluetooth has the capability to signal hop. why would it do this? which communication range does it use?

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Answer 20

to avoid interference

2.4GHz

Question 21

is security an issue with infrared?

why or why not?

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Answer 21

no

max range is 1 meter with an angle of 30 degrees

Question 22

what’s the first thing you need to do when you set up a SECURED wireless router?

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Answer 22

change the router’s SSID

Question 23

what’s more secure, WEP or RADIUS?

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Answer 23

RADIUS

Question 24

in addition to disabling the broadcast of your router’s SSID, tell me two things you can do to increase its security

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Answer 24

encryption

MAC filtering

Question 25

explain port triggering

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Answer 25

automated form of port forwarding