Chapter 8 Installing Wireless and SOHO Networks.

Question 1

Decribe 802.11a networking standard

Answer 1

Provides WLAN bandwdith up to 54 Mbps in the the 5 GHz frequency spectrum. Uses OFDM for encoding.

Question 2

Describe networking standard 802.11b

Answer 2

Ratified in 1999. provides bandwidth for upto 11 Mbps in the 2.2 GHz range. Slower than 802.11a but was the de facto wireless networking stanrd for several years.

Question 3

Why are 802.11a and 802.11b incompatible?

Answer 3

Frequency and modulation. 802.11a runs at 5 GHz and uses OFDM while 802.11b runs at 2.4 GHz and uses DSSS

Question 4

Describe networking standard 802.11g.

Answer 4

Ratified in 2003. Provides bandwidth of 54 Mbps in the 2.4 GHz frequency spectrum using OFDM and DSSS. Compatible with 802.11b.

Question 5

Which frequency channels are none over lapping?

Answer 5

Channels 1, 6, and 11

Question 6

Describe 802.11n neworking standard

Answer 6

Ratified in 2010. Claims to support bandwidth of up to 600 Mbps but in reality it’s closer to 300-450 Mbps. Can operate in both 2.4 and 5 GHz bandwidth. Backwards compatible with 802.11a/b/g. Bonds channelstogether to create more throughput. Uses MIMO

Question 7

Describe 802.11ac networking standard.

Answer 7

Ratifies in 2014. Most up to date version of 802.11. Claims to have Gigabit Speeds but most common speed is around 800 Mbps. Uses MUMIMO.

Question 8

What is 3G?

Answer 8

Third generation mobile networking standard. Consisted of either GSM or CDMA depending on where you were. Capabple of data rates of between 200 Kbps and 7 Mbps

Question 9

What frequency does Bluetooth run on?

Answer 9

2.4 GHz range

Question 10

What is 4G

Answer 10

4th Gen standard for mobile devices. Provides data rates of between 100 Mpbs to 1 Gbps. Differs from 3G in that it uses IP instead of telephone circuits. Used LTE (Long-Term Evolution) for speed over 3G.

Question 11

What is LTE.

Answer 11

Long Term evolution. This relates to 4G and 5G and is communications standard. It improves capacity and speed.

Question 12

What is 5G

Answer 12

Latest generation of mobile networking standard. Around 6-7 times faster than 4G. Sustained speeds of about 1 Gbps. Uses LTE

Question 13

What IoT?

Answer 13

Internet of things.

Question 14

What two network standards deal with IoT?

Answer 14

Zigbee and Z-wave

Question 15

What ranges do Zigbee and Z-wave operate on?

Answer 15

Zigabee - 2.4 GHz (though some devices can run at lower)

Z-wave - 800 MHz / 900 Mhz

Question 16

What is RFID?

Answer 16

Radio Frequency Identification. Operates between 125 kHz - 960 MHz.

Question 17

What is RFID used for?

Answer 17

Identify items such as items in a store, people or moving objects.

Question 18

What NFC?

Answer 18

Near field communication. IT transmits at 13.56 MHz. Used for contactless payment.

Question 19

What are the 3 frequency that RFID transmit at?

Answer 19

RFID(LF) - 125/134 kHz

RFID(HF) - 13.56 MHZ

RFID(UHF) - 856/960 MHz

Question 20

What is Dial-Up/POTS?

Answer 20

Dial-Up / Plain Old Telephone Service. One of the oldest ways to connect to the internet. Still around but due to location and cost but it is slow. (56Kbps)

Question 21

What is DSL?

Answer 21

Digital Subcriber Line. One of the two most popular broadband choices.

Question 22

What would you need to in order to utilize DSL?

Answer 22

A DSL modem and a network card in your computer.

Question 23

What are the different versions of DSL you can have?

Answer 23

ADSL - Asymmteric

SDSL - Symmetric

HDSL - High Bit Rate

VDSL - Very High Bit Rate

Question 24

Apart from DSL what is another popular home-broadband option?

Answer 24

Cable (using cable modem)

Question 25

What are some advantages of using DSL?

Answer 25

Must faster than dial up Bandwidth not shared with other users generally very reliable (depending on ISP)

Question 26

What are some pro's and con's of cable broadband?

Answer 26

Must faster than dial-up (and can be faster than DSL for uploads) Not required to have or use a telephone line General very reliable (depending on ISP) You do share bandwidth with ohter uses which can vary speeds.

Question 27

What is ISDN and when would you consider using it?

Answer 27

Intergrated Services Digital Network. Provides both voice and data connections but is very slow compared to DSL and Cable.

Question 28

What are some of the pro's and con's of satellite broadband?

Answer 28

It useful for areas where a cable cannot be run. Useful if your internet needs are mobile and cellular speeds won't cut it Can be affect by weather Speeds are capped More expensive than cable and DSL Latency can be an issue

Question 29

What are the 5 critical steps to setting up a secured wireless router according to the Wi-Fi Alliance?

Answer 29

Change the SSD Change the admin username and password Select AES or WPA2 Choose a high quality security password From the clients select WPA2 and enter the security passphrase to connect

Question 30

What are the three wireless enrption types?

Answer 30

WEP - Wired Equivalent Privacy WPA - Wifi Protected Access WPA2 - Wifi Protected Access 2

Question 31

How does WEP encrypt data?

Answer 31

It uses a static key that is commonly 10, 26, and 58 hexadecimal characters long.

Question 32

How does WPA encrypt data?

Answer 32

It uses Temporal Key Integrity Protocol (TKIP). It generates a new key for each packet sent.

Question 33

How does WPA 2 encrpyt data?

Answer 33

It uses CCMP (Counter Mode CBC-MAC Protocol) which is based on the AES (Advanced Encryption Standard) algorithm

Question 34

WPA and WPA 2 have two variants. What are they?

Answer 34

Personal and Enterprise.

Question 35

What is QoS?

Answer 35

Quality of Service. It lets and administrator control traffic to maintain a certain level of service.

Question 36

Most firewalls have at least two network connections. What are they?

Answer 36

The public side (internet) The private side (internal network)

Question 37

What is a DMZ?

Answer 37

Demilitarised Zone. A network port of a firewall used to connect servers that are both public and private.

Question 38

What are the two general categories of firewalls?

Answer 38

Network-based Host-based

Question 39

What is thebasic method for configuring a firewall?

Answer 39

By using an ACL (Access Control List)

Question 40

What is port triggering?

Answer 40

A firewall concept where the computer will allow traffic to enter a specific port after making an outbound request on the same port.