1.6 wireless configuration Flashcards
What is needed for seamless migration between APs?
For users to be able to maintain constant connection when moving between APs, both must use the same SSIDs with different channels on each.
What is AP isolation?
Access Point isolation is a technique for preventing devices connected to an AP from communicating directly with each other.
What do distance-vector dynamic routing protocols use to prevent routing loops?
Split-horizon route advertisement is a method of preventing routing loops in distance-vector routing protocols by prohibiting a router from advertising a route back onto the interface from which it was learned.
What is CDMA?
Code division multiple access.
Circuit-switched muxing standard with poor data support.
What is TDMA?
Time-Division Multiple Access.
A form of multiplexing used to support the GSM cellular standard.
Everyone gets a “little slice of time” to complete communication.
What is GSM?
Global System for Mobile Communication.
Circuit-switched cellular standard with poor data support. Used a multiplexing called TDMA.
What is LTE?
Long term evolution. Cullular standard that allows communication of voice and data simultaneously.
Download speed of LTE 4G?
300mbps
What two standards are associated with 2G? Why are they phased out?
GSM, CDMA
Phones could only support one or the other.
What is a multiplexer/muxing?
A technology used to allow different signals to send data across a limited communication medium.
What are two examples of multiplexing?
CDMA, TDMA.
What is the difference between CDMA and TDMA?
In TDMA all signals are blended into one and everyone has a limited time slot to send data.
In CDMA everyone communicates simultaneously and recipients simply filter out traffic not meant for them.
802.11a
5Ghz
54 Mbs
20Mhz
802.11b
2.4Ghz
11 Mbs
22Mhz
802.11g
2.4Ghz
54 Mbs
20Mhz
802.11n
5 and 2.4Ghz
40Mhz
150Mbs - 600Mbs
4 MIMO
802.11ac
5Ghz 866.7 - 6.8Gbs 80-160Mhz 8 MIMO/MU channel bonding
What is notable about 2.4Ghz compared to 5Ghz?
It has less absorption (longer range) than 5, but more frequency conflict.
What is channel bonding?
Bonding together multiple channels to increase bandwidth. Used in 802.11ac and 802.11n.
Number of antenna needed for MIMO for 802.11n?
4
Number of antenna needed for MIMO for 802.11ac?
8
What is LWAPP?
Lightweight Access Point Protocol.
LWAPP a proprietary protocol used to provide central control of Access Points, the AP automatically detects the best available Wireless LAN Controller (WLC) to download SSID configuration information with no hands-on intervention.
