chapter 8/instaling wireless and SOHO network Flashcards
wireless
339
Wireless Fidelity, Wi-Fi utilizes one of the IEEE 802.11 wireless standards to achieve a wireless connection to a network. A home wireless network uses a wireless access point or router to broadcast a signal using WAP or WEP encryption to send and receive signals from wireless devices on the network.
the IEEE is the most slandered but there are other out there like Bluetooth, cellular, infrared and more
802.11
there are over 20 IEEE, we are going to do only 4 of them
340
there are: IEEE 802.11 a IEEE 802.11 b IEEE 802.11 g IEEE 802.11 n
what do you need to know in order to connect to the wireless router or Hub
340
the client need to know the service set identifier of the device SSID
802.11 use an access method different then the one Ethernet uses (CSMA/CD)
340
802.11 uses ( CSMA/CA ) carrier sense multiple access/collision avoidance
802.11
340
WLAN’s standard capable of transmissions of 1 to 2 Mbps and operates in the 2.4 GHz band.
it uses ether FHSS or DSSS spectrum
802.11 a
340
Capable of transmissions of up to 54 Mbps and operates in the 5 GHz band.
data rate 11 Mbps
802.11 b
341
802.11b is capable of transmissions of up to 11 Mbps and operates in the 2.4 GHz band.
it uses DSSS for Data encoding
Data rate 11Mbps
802.11g
341
Capable of transmissions of up to 20 Mbps and operates in the 2.4 GHz band using OFDM or DSSS
Data rate 54Mbps
802.11 n
343
Operates using the 2.4GHz and 5GHz bandwidths. It utilizes multiple-input, multiple-output (MIMO) antennas to improve data transfer speeds. Data rate 600 Mbps
Modulation Technique
343
?
802.11 Devices
343
NIC card including USB and PCMCIA
wireless router
a hub called wireless access point WAP
Wireless Encryption Standards
344
wireless computers are like radios any one can listen to it , to solve this problem we need to put keys for safety
For that there are some encryption standards or security standards.
WEP
WPA
WPA2
WEP
never use the WEP encryption protocol.
345
Wireless Equivalent Privacy,
There were three different levels of encryption that we were able to use, WEP 64-bit uses 10 characters key and a much stronger WEP 128-bit uses 26 characters key. and the 3 one was WEP 256-bit uses 58 characters key.
WPA
345
Wi-Fi Protected Access, WPA is an improved data encryption standard
WPA used an encryption method called, TKIP stands for temporal key integrity protocol, WPA uses 128 bit dynamic per-packet key. WPA generated a new key for every packet.
WPA2
345
WPA2 (Wi-Fi Protected Access II) provides security and encryption for data transmissions and general computer connectivity and is a replacement for WPA. it uses CCMP which is a protocol based on AES
internet connection 2 types
346
Dial up or broadband
what is Dial up
347
A connection that is established using a modem connected to an active phone line. it is not use much these days
Broadband
348
high-speed Internet or wideband transmission, broadband (bb) is telecommunications that provide a variety of channels of data over a single communication medium (wire). Today, there are a wide variety of broadband technologies available in most areas. some of the broadband are: DSL Cable ISDN Fiber optic internet Satellite Cellular ( WAN) WiMAX
DSL
348
Digital Subscriber Line, DSL is a method for home users and small businesses, DSL connection will need DSL modems RJ11 and an RJ45 and a Filter.
the commonly seen is actually called ADSL, with the A at the beginning. That A stands for asymmetric. That’s because the download speeds that you receive over DSL are different than the speeds available for upload. Those speeds are therefore asymmetric.
download speed range is 256 Kbps to 12 Mbps
Cable
351
A cable modem is a hardware device that allows your computer to communicate with an Internet Service Provider over a landline connection. It converts an analog signal to a digital signal for the purpose of granting access to broadband Internet. A cable modem works by connecting a coaxial cable to a jack in the wall and then a Cat5 (Ethernet) cord from the modem to a computer or a network router. Network routers are used to share your Internet connection between multiple computers.
128 Kbps to 50 Mbps
ISDN
353
Integrated Services Digital Network, ISDN is a telecommunications network that allows for digital voice, video, and data transmission.
download speed range is 64 kbps to 1.5 Mbps
Fiber optic internet
354
Fiber optics allow for a much faster data transmission than standard copper wires, due to the fact that they have a much higher bandwidth. They are common amongst corporate networks or world-wide networks such as Internet backbones because of the capabilities of the cable.
Fiber-Optic Service, known as FiOS, is a data transmission technology utilizing fiber- optic cables to create broadband networks.
Download speed range is 150 Mbps
cellular WAN
357
When referring to a wireless network, a Wi-Fi hotspot or wireless hotspot is a location that enables users to connect to a network or the Internet with their wireless adapters. Some mobile phone carriers offer a device called a Mobile Hotspot, which allow users to connect non-phone devices to the data network of the mobile phone carrier.
Download speed range go up to 14.7 Mbps
WiMAX
357
Alternatively referred to as IEEE 802.16, WiMAX (Worldwide Interoperability for Microwave Access) is a wireless microwave MAN technology that provides up to 1Gbit/s as far as 30 miles away. WiMAX is similar to Wi-Fi technology, except that it can provide much higher data transfer rates, causing some people to call it “Wi-Fi on steroids.” It is also based on the IEEE 802.16 standard, whereas Wi-Fi is based on the IEEE 802.11 standard.
Download speed range go up to 6 Mbps
Satellite
355
This is communicating from your ground station, from your computer, directly up to a satellite and then back again.
Download speed range from 128 kbps to 4 Mbps
