CWNA-106 Certified Wireless Network Administrator Questions and Answers

dBm

W

dB

mW

VSWR

10 dBm

13 dBm

20 dBm

26 dBm

30 dBm

A heat map demonstrating signal quality in areas where VoWiFi is supported.

Codec types and sampling rates for each VoWiFi phone

Security parameters and configuration steps for VoWiFi handsets.

Test results from an active survey with a VoWiFi handset

Results of OFDM versus ERP performance in each BSA

Conversion loss

Through loss

Active loss

Intentional loss

HT Protection mode

Non-ERP Present field

Secondary channel offset

RIFS mode

Power save mode of clients

Verifying that a user is who he says he is

Validating client device credentials against a database

Logging the details of user network behavior in order to review it at a later time

Granting access to specific network services according to a user profile

Implementing a WIPS as a full-time monitoring solution to enforce policies

10 mW

25 mW

50 mW

250 mW

1000 mW

HR/DSSS (802.11b)

OFDM (802.11a)

ERP (802.11g)

HT (802.11n)

CCK (802.11b)

VHT (802.11ac)

The direct signal will only be received if the reflected signal is more than 180 degrees out of phase.

The direct signal cannot be received if the indirect signal is less than 90 degrees out-of-phase.

The signals will be distorted if the indirect signal arrives simultaneously at the receiver, but 90 degrees out-of-phase.

If the signals are in-phase, they will combine together, cancel one another out, and create a null.

256-QAM

Distributed Coordination Function (DCF)

Phase Shift Keying (PSK)

Transmit Power Control (TPC)

Radio Resource Management (RRM)

Dynamic Frequency Selection (DFS)

802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.

Four 802.1p user priorities are mapped to eight 802.11 transmit queues.

When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.

To improve efficiency, Block Acknowledgments are required for Voice and Video WMM queues.

802.11 control frames are assigned to the 802.11 EF priority queue.

RF cables have upper and lower frequency range specifications.

75 and 125 ohms are the typical impedances of 802.11 WLAN connectors.

Two RF connectors of the same type (e.g. SMA), manufactured by different companies, may vary in specifications.

Every RF connector causes insertion loss.

Large diameter RF cables cause greater loss than small diameter cables.

To improve capacity in the BSS

To reduce the size of the AP’s effective service area

To prevent 802.11b devices from associating

To maximize the range of the highest data rates

To prevent VoWiFi multicast frames

To enable support for long preambles

SNMP

VRRP

RBAC

IPSec

WIPS

WPA2

All vendors use the same protocol so that APs will interoperate with WLAN controllers from other vendors.

Some vendors use proprietary protocols, and some vendors use protocols based on public standards like RFCs.

For most vendors, the controller-based APs maintain data and control tunnels with at least two controllers for immediate failover and redundancy.

All vendors support at least one L2 or L3 broadcast protocol for controller discovery by controller-based APs.

All vendors recommend using L2 (instead of L3) controller discovery and tunneling protocols in large enterprises.