CWNP CWISA-102 CWISA Exam Practice Test Instant Access

Question 1

What is the primary difference between LoRa and LoRaWAN

ALoRa uses RF and LoRaWAN uses light-based communications

BLoRa is the modulation method (using CSS modulation at the Physical Layer) and LoRaWAN is the MAC sub-layer of the Data Link layer

CLoRa is the Physical Layer and LoRaWAN is the Transport Layer

DLoRa is used for communicating across the Internet and LoRaWAN is used only on the local link

Answer : B

LoRa:This refers to the underlying radio modulation technique using Chirp Spread Spectrum (CSS). It defines how data is physically encoded onto the wireless signal.

LoRaWAN:This is the network protocol built on top of LoRa. It manages device communication, network topology, and aspects like security. It operates at the MAC sublayer of the Data Link layer (Layer 2) of the OSI model

LoRa vs. LoRaWAN:Key takeaway is that LoRa is the physical layer technology, while LoRaWAN adds the networking layer for management.

References:

LoRa Modulation:Technical explanations of Chirp Spread Spectrum (CSS).

LoRaWAN Specification:Official documentation detailing the network architecture and MAC layer functions.

OSI Model:Descriptions of the Data Link layer and its role in networking.

Question 2

What is most often used to track livestock on large farms and identify each animal Individually?

APhotodiode sensors

BRFID tags

C802.11 wireless radios

DThermistor sensors

Answer : B

RFID for Livestock:Radio Frequency Identification (RFID) tags are the most widely used technology for livestock tracking and individual identification on large farms.

Benefits:

Unique ID:Each RFID tag has a unique code.

Data Storage:Some tags store information about the animal.

Durability:Tags withstand outdoor conditions.

Automated Reading:Tags can be scanned quickly.

References

RFID (General):https://en.wikipedia.org/wiki/Radio-frequency_identification

Question 3

You are troubleshooting a problem with a wireless solution that uses MQTT where the IoT end devices are not reporting to the MQTT server/broker. At what Layer of the OSI Model should troubleshooting begin when using a bottom-up method?

ALayer 1

BLayer 4

CLayer 5

DLayer 6

Answer : A

Bottom-Up Troubleshooting:The OSI model provides a structured diagnostic approach. Starting at Layer 1 ensures basic physical connectivity issues are ruled out first.

MQTT Relies on IP:MQTT operates at a higher layer of the OSI model, relying on TCP/IP (Layers 4 and 3) for communication. Problems at the physical layer will disrupt everything built upon it.

Checking the Fundamentals:Before investigating complex application issues (MQTT), verify cables, link lights, Wi-Fi signal strength, etc.

References:

OSI Model:Descriptions of the seven layers, emphasizing the foundation provided by Layer 1 (Physical).

Network Troubleshooting Guides:Resources that outline common Layer 1 problems and their symptoms.

Question 4

What is the typical range of a wireless body area network (WBAN)?

A1-2 meters

B10 square meters

C10 centimeters

D10 meters

Answer : A

WBAN Range:Wireless Body Area Networks (WBANs) specialize in short-range communication around the human body. Typical ranges fall within 1-2 meters.

Purpose:This range is designed to:

Connect sensors monitoring health metrics.

Transmit data to a central coordinator device (e.g., smartphone).

Minimize interference potential with other wireless networks.

References

WBAN Overview:https://en.wikipedia.org/wiki/Body_area_network

WBAN Research Paper (Check Range Discussion):https://www.mdpi.com/2224-2708/11/4/67

Question 5

What function does the IEEE perform in relation to wireless technologies?

APromotes technology and standards development

BDesigns wireless chipsets

CCertified equipment to be compatible

DBrings wireless products to market

Answer : A

IEEE's Role:The Institute of Electrical and Electronics Engineers (IEEE) is a global organization critical in developing and promoting technical standards across various fields, including wireless technologies.

Standards Work:IEEE creates wireless technology standards like:

IEEE 802.11:Wi-Fi standards

IEEE 802.15.4:Basis for ZigBee, Thread, and other low-power networks

References

IEEE:https://www.ieee.org/

Question 6

What is defined as the weakening of signal amplitude as the signal passes through a medium?

ADiffraction

BReflection

CAttenuation

DScattering

Answer : C

Attenuation:Describes the progressive loss of signal strength as it travels through a medium (like air, cables, walls). It's caused by factors like absorption, distance, and obstacles.

Other Phenomena:

Diffraction:Bending of waves around obstacles.

Reflection:Waves bouncing off surfaces.

**Scattering: ** Waves dispersing in multiple directions.

References

Attenuation:https://en.wikipedia.org/wiki/Attenuation

Question 7

How does OFDMA differ from OFDM?

ASubcarriers of OFDMA can contain data destined for a different receiver

BOFDMA offers greater range by using multiple channels at once

COFDMA allows multiple devices to transmit simultaneously on the same frequency

DOFDMA uses multiple radios to achieve higher throughput

Answer : C

OFDM vs. OFDMA:

OFDM (Orthogonal Frequency-Division Multiplexing):Divides a channel into multiple subcarriers for data transmission.

OFDMA (Orthogonal Frequency-Division Multiple Access):Extends OFDM by allowing multiple users to share subcarriers simultaneously, improving efficiency and spectral utilization.

References

OFDM:https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing

OFDMA:https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiple_access

CWNP Certified Wireless IoT Solutions Administrator Exam CWISA-102 CWISA Exam Practice Test