Wireless Networking

Question 1

IBSS

Answer 1

Independent Basic Service Set used in Ad Hoc peer to peer network mode

Question 2

802.11 3 standard broadcasting methods

Answer 2

1. DSSS
2. FHSS
3. OFDM

Question 3

DSSS

Answer 3

Direct sequence Spread spectrum; Sends data out on different frequencies at the same time

Question 4

FHSS

Answer 4

Frequency Hopping spread spectrum; sends data out on one frequency at a time

Question 5

OFDM

Answer 5

Orthogonal frequency division Multiplexing; better at dealing with interference and is used on all but the earliest 802.11 networks.

Question 6

Channels that WAPs can use

Answer 6

1-11, default channels like 1,6 and 11 are used because they do not overlap

Question 7

CSMA/CA

Answer 7

Carrier sense multiple access with collision avoidance; each sending node detects the collision and responds by generating a random timeout period for itself, during which it doesn’t try to send any more data on the network which is called a backoff.

Question 8

DCF

Answer 8

Distributed Coordination Function; specifies rules for sending data onto the network media.

Question 9

802.11b

Answer 9

Data throughput: 11Mbps
Range: Up to 300ft
Frequency: 2.4GHz
Spectrum: DSSS

Question 10

802.11a

Answer 10

Data Throughput: 54Mbps
Range: Up to 150 Feet
Frequency: 5.0GHz
Spectrum: OFDM

Question 11

802.11g

Answer 11

Data Throughput: 54Mpbs
Range: Up to 300 Feet
Frequency: 2.4GHz
Spectrum: OFDM

Question 12

802.11n

Answer 12

Data Throughput: 100+ Mbps
Range: Up to 300 Feet
Frequency: 2.4GHz also supports dual band
Spectrum: OFDM (QAM)

Question 13

MIMI

Answer 13

Multiple In/Multiple Out; which enables the devices to make multiple simultaneous connections called streams

Question 14

Transmit Beamforming

Answer 14

A Multipole Antenna tech that helps get rid of dead spots.

Question 15

802.11ac

Answer 15

Data Throughput: Up to 1Gbps
Range: Up to 300 Feet
Frequency: 5 GHz
Spectrum: OFDM (QAM)

Question 16

802.11i

Answer 16

First standard security encryption for wireless networks that used the 802.1X standard to enable you to setup a network with secure authentication using RADIUS server and passwords encrypted with EAP.

Question 17

EAP

Answer 17

Extensible Authentication Protocol. which is a PPP wrapping that EAP compliant applications can use to accept one of many types of authentication.

Question 18

EAP-PSK

Answer 18

EAP-Pre Shared Key, is nothing more than a shared secret code thats stored on both the wireless access point and the wireless client encrypted using AES encryption.

Question 19

EAP-TLS

Answer 19

EAP with transport Layer Security defines the use of a RADIUS server as well as mutual authentication. Requiring certificates on both the server and client.

Question 20

EAP-TTLS

Answer 20

EAP Tunneled TLS is similar to EAP-TLS but only uses single server side certificate.

Question 21

EAP-MS-CHAPv2

Answer 21

More commonly known as PEAP (Protected EAP) uses a password function based on CHAPv2 with the addition of an encrypted TLS tunnel. Most common implementation of EAP.

Question 22

EAP-MD5

Answer 22

Very simple version of EAP that uses only MD5 hashes for transfer of auth credentials. Is weak and the least used of all the version of EAP

Question 23

LEAP

Answer 23

Lightweight EAP is a proprietary EAP auth used almost exclusively by Cisco Wireless products. Combination of MS-CHAP and RADIUS server

Question 24

EAP-FAST

Answer 24

EAP Flexible Authentication via secure tunneling is ciscos replacement for LEAP.

Question 25

802.1x

Answer 25

A port based auth network acccess control mechanism for networks.

Question 26

WEP

Answer 26

Wired Equivalent Privacy, uses 64 bit or 128 bit encryption algorithm to scramble data frames.

Question 27

WPA

Answer 27

Wifi Protected Access. Offered security enhancements such as dynamic encryption key generation and encryption key integrity frame checking feature.

Question 28

TKIP

Answer 28

Temporal Key Integrity Protocol. Still used RC4 for cipher

Question 29

WPA2

Answer 29

Wifi protected access 2, used the AES full 802.11i standard.

Question 30

WPA2-Enterprise

Answer 30

Just adds enterprise class wireless equipment

Question 31

LWAPP

Answer 31

Lightweight Access Point Protocol

Question 32

VLAN Pooling

Answer 32

Creating a pool of VLAN for a single SSID and randomly assigning wireless clients to one of the VLANs.