1.6 wireless configuration

Question 1

What is needed for seamless migration between APs?

Answer 1

For users to be able to maintain constant connection when moving between APs, both must use the same SSIDs with different channels on each.

Question 2

What is AP isolation?

Answer 2

Access Point isolation is a technique for preventing devices connected to an AP from communicating directly with each other.

Question 3

What do distance-vector dynamic routing protocols use to prevent routing loops?

Answer 3

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.

Question 4

What is CDMA?

Answer 4

Code division multiple access.

Circuit-switched muxing standard with poor data support.

Question 5

What is TDMA?

Answer 5

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.

Question 6

What is GSM?

Answer 6

Global System for Mobile Communication.

Circuit-switched cellular standard with poor data support. Used a multiplexing called TDMA.

Question 7

What is LTE?

Answer 7

Long term evolution. Cullular standard that allows communication of voice and data simultaneously.

Question 8

Download speed of LTE 4G?

Answer 8

300mbps

Question 9

What two standards are associated with 2G? Why are they phased out?

Answer 9

GSM, CDMA

Phones could only support one or the other.

Question 10

What is a multiplexer/muxing?

Answer 10

A technology used to allow different signals to send data across a limited communication medium.

Question 11

What are two examples of multiplexing?

Answer 11

CDMA, TDMA.

Question 12

What is the difference between CDMA and TDMA?

Answer 12

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.

Question 13

802.11a

Answer 13

5Ghz
54 Mbs
20Mhz

Question 14

802.11b

Answer 14

2.4Ghz
11 Mbs
22Mhz

Question 15

802.11g

Answer 15

2.4Ghz
54 Mbs
20Mhz

Question 16

802.11n

Answer 16

5 and 2.4Ghz
40Mhz
150Mbs - 600Mbs
4 MIMO

Question 17

802.11ac

Answer 17

5Ghz
866.7 - 6.8Gbs
80-160Mhz
8 MIMO/MU
channel bonding

Question 18

What is notable about 2.4Ghz compared to 5Ghz?

Answer 18

It has less absorption (longer range) than 5, but more frequency conflict.

Question 19

What is channel bonding?

Answer 19

Bonding together multiple channels to increase bandwidth. Used in 802.11ac and 802.11n.

Question 20

Number of antenna needed for MIMO for 802.11n?

Answer 20

4

Question 21

Number of antenna needed for MIMO for 802.11ac?

Answer 21

8

Question 22

What is LWAPP?

Answer 22

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.