Chapter 8 Flashcards
(25 cards)
Which wireless technology is best suited for WLANs?
802.11 p. 340
What is the most commonly used wireless standard today?
802.11g p. 341
What are some advantages to operating on an 802.11n wireless network?
It has a bandwidth of 600Mbps and operates in 2.4 and 5 GHz ranges. It has a faster throughput. It can use 40MHz channels, multiple inpute multiple output (MIMO) and channel bonding. MIMO means using multiple antennas (up to 8) and it is backward compatable with 802.11 a b and g p. 342
Describe Frequency-hopping spread spectrum (FHSS)modulation technique.
FHSS accomplishes communication by hopping the transmission over a range of predefined frequencies. p. 343
What are 3 signal modulation techniques used in the 802.11 standards?
Frequency hopping spread spectrum FHSS
Direct sequence spread spectrum DSSS
Orthogonal Frequency division multiplexing OFDM p. 343
Describe Direct Sequence Spread Spectrum DSSS
Dsss accomlishies communication by adding the data that is to be transmitted to a higher speed transmission. THe higher speed transmission contains redundant info to ensure data accuracy. p. 343
Describe Orthgonal Frequency division multiplexing OFDM
OFDM accomplishes communication by breaking hte data into subsignals and transmitting them simultaneously. The transmissions occur on different freuencies or subbands. p. 343
What are some things that can interfere with 802.11?
older bludetooth, cordless phones, cell phones, other WLANS and a microwave. P. 343
Describe a WEP.
Its an encryption method to run your wireless network.It uses a static key. p. 345
How do routers allow communications between specific access points?:
WIth the Use of SSIDs. Wireless routers broadcast their SSID (network name) and anyone can pick it up unless you configure the router not to broadcast and set up your clients with the SSID. p. 344
What is Temporal Key Integrity Protocol TKIP?
When WEP was replaced by WPA (WI FI Protected Access) it impeented some features of the IEEE 802.11i securtity specification. TKIP uses a 128 bit dynamic per packet key. p. 345
What is the Advanced Encryptioj Standard (AES) algorythem?
Wi FI Protedcted aCCESS 2 WPA2, uses Counter Mode CBC MAC Protocol CCMP wich is based on AES secruity algorithm. p. 345
What is a SOHO network?
A Small Office or Home network. p. 346
What are the two catagories of connection to the internet?
broadband and dialup. p. 347
What hardware do you need to use DSL (Digital Subscriber LIne)?
A a DSL modem and network card in computer. p. 348
What are some types of DSL?
High bit rate DSL (HDSL) symmeteric DSL (SDSL) asymmetric DSL (ADSL) Very HIgh bit Rate DSL (VDSL) Rate adaptive DSL (RADSL) p. 348
What is the most popular form of home DSL?
ADSL pl 348
Describe how a cable modem works.
They provide internet acces through cable service instead of phone lines like DSL. Plug thernet into the cable modem and the other side goes into a TV jack instead of a phone jack. p. 351
What are some advantages of using cable over DSL?
Its much faster, not required to have a landline, it is relialble. p. 352
Describe Integrated Services DIgital Network ISDN.
its a digital point to point network. It uses the phone lines but caries digital signals. It is considered broadband. p. 353
Describe Fiber to the Node FTTN.
Fiber cables are run to the ophone or cable companys utility box near the street then runs copper to your house. p. 354
What are some drawbacks to sattellite internet?
the need for a satellite dish and reliance upon its technology, it is slower than broadband. p. 355
What are two major cell standards for the US?
Global System for Mobile Communications (GSM) and Code Divsion Multiple Access (CDMA) available only in the US. pl. 357
What is a MiFI?
Mobile Hotspot. p. 358
