Chapter 8 Installing Wireless and SOHO Networks. Flashcards
Decribe 802.11a networking standard
Provides WLAN bandwdith up to 54 Mbps in the the 5 GHz frequency spectrum. Uses OFDM for encoding.
Describe networking standard 802.11b
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.
Why are 802.11a and 802.11b incompatible?
Frequency and modulation. 802.11a runs at 5 GHz and uses OFDM while 802.11b runs at 2.4 GHz and uses DSSS
Describe networking standard 802.11g.
Ratified in 2003. Provides bandwidth of 54 Mbps in the 2.4 GHz frequency spectrum using OFDM and DSSS. Compatible with 802.11b.
Which frequency channels are none over lapping?
Channels 1, 6, and 11
Describe 802.11n neworking standard
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
Describe 802.11ac networking standard.
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.
What is 3G?
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
What frequency does Bluetooth run on?
2.4 GHz range
What is 4G
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.
What is LTE.
Long Term evolution. This relates to 4G and 5G and is communications standard. It improves capacity and speed.
What is 5G
Latest generation of mobile networking standard. Around 6-7 times faster than 4G. Sustained speeds of about 1 Gbps. Uses LTE
What IoT?
Internet of things.
What two network standards deal with IoT?
Zigbee and Z-wave
What ranges do Zigbee and Z-wave operate on?
Zigabee - 2.4 GHz (though some devices can run at lower)
Z-wave - 800 MHz / 900 Mhz
What is RFID?
Radio Frequency Identification. Operates between 125 kHz - 960 MHz.
What is RFID used for?
Identify items such as items in a store, people or moving objects.
What NFC?
Near field communication. IT transmits at 13.56 MHz. Used for contactless payment.
What are the 3 frequency that RFID transmit at?
RFID(LF) - 125/134 kHz
RFID(HF) - 13.56 MHZ
RFID(UHF) - 856/960 MHz
What is Dial-Up/POTS?
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)
What is DSL?
Digital Subcriber Line. One of the two most popular broadband choices.
What would you need to in order to utilize DSL?
A DSL modem and a network card in your computer.
What are the different versions of DSL you can have?
ADSL - Asymmteric
SDSL - Symmetric
HDSL - High Bit Rate
VDSL - Very High Bit Rate
Apart from DSL what is another popular home-broadband option?
Cable (using cable modem)
What are some advantages of using DSL?
Must faster than dial up
Bandwidth not shared with other users
generally very reliable (depending on ISP)
What are some pro’s and con’s of cable broadband?
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.
What is ISDN and when would you consider using it?
Intergrated Services Digital Network. Provides both voice and data connections but is very slow compared to DSL and Cable.
What are some of the pro’s and con’s of satellite broadband?
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
What are the 5 critical steps to setting up a secured wireless router according to the Wi-Fi Alliance?
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
What are the three wireless enrption types?
WEP - Wired Equivalent Privacy
WPA - Wifi Protected Access
WPA2 - Wifi Protected Access 2
How does WEP encrypt data?
It uses a static key that is commonly 10, 26, and 58 hexadecimal characters long.
How does WPA encrypt data?
It uses Temporal Key Integrity Protocol (TKIP). It generates a new key for each packet sent.
How does WPA 2 encrpyt data?
It uses CCMP (Counter Mode CBC-MAC Protocol) which is based on the AES (Advanced Encryption Standard) algorithm
WPA and WPA 2 have two variants. What are they?
Personal and Enterprise.
What is QoS?
Quality of Service. It lets and administrator control traffic to maintain a certain level of service.
Most firewalls have at least two network connections. What are they?
The public side (internet)
The private side (internal network)
What is a DMZ?
Demilitarised Zone. A network port of a firewall used to connect servers that are both public and private.
What are the two general categories of firewalls?
Network-based
Host-based
What is thebasic method for configuring a firewall?
By using an ACL (Access Control List)
What is port triggering?
A firewall concept where the computer will allow traffic to enter a specific port after making an outbound request on the same port.
