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NEW QUESTION # 14
What modulation is used by LoRa?
Answer: C
Explanation:
LoRa Modulation: LoRa (Long Range) is a proprietary wireless technology that utilizes Chirp Spread Spectrum (CSS) modulation.
CSS Characteristics:
Spread spectrum technique for resilience against interference.
Chirps (frequency sweeps) enable operation below the noise floor for long range.
References
LoRa: https://en.wikipedia.org/wiki/LoRa
Chirp Spread Spectrum (CSS): https://en.wikipedia.org/wiki/Chirp_spread_spectrum
NEW QUESTION # 15
What provides the security (encryption) in an HTTPS connection?
Answer: C
Explanation:
SSL/TLS Secures Web Traffic: HTTPS builds upon HTTP, adding the encryption provided by Secure Sockets Layer (SSL) or its successor, Transport Layer Security (TLS).
Other Protocols Have Different Purposes:
IPSec: Secures IP traffic at a network level, can be used alongside TLS.
SNMPv3: Management protocol, offers security features, but not the primary mechanism in HTTPS.
SSH: Secure remote shell, unrelated to web data encryption.
References:
TLS (and SSL): References of their role in HTTPS and how they provide encryption for web communication.
HTTPS Overview: Materials showing how TLS fits into the overall HTTPS architecture.
NEW QUESTION # 16
You have implemented a wireless mesh network. All mesh nodes are properly configured for participation in the same mesh network. Several of the mesh nodes are unable to connect to other mesh nodes. What action may provide a solution to this problem?
Answer: B
Explanation:
Mesh Connectivity Depends on Signal: Mesh nodes relay data for each other. Weak signal strength between nodes can disrupt connectivity throughout the network.
Troubleshooting Signal Issues: Physically relocating affected nodes can improve their ability to form stable connections with other nodes in the mesh.
Why Other Options May Not Help:
Separate Mesh: Splits the network, not solving the root connectivity issue Output Power: May help marginally, but significant improvement is typically achieved through repositioning.
Security Settings: Unlikely to cause connectivity issues between properly configured nodes in the same mesh.
References:
Wireless Mesh Network Troubleshooting: Guides addressing signal strength and coverage concerns.
RF Site Survey Tools: Resources on software that can help visualize signal strength and aid in node placement.
NEW QUESTION # 17
What is the primary difference between LoRa and LoRaWAN
Answer: C
Explanation:
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.
NEW QUESTION # 18
What is the spacing between ZigBee channels when operating in the 2.4 GHz frequency band?
Answer: A
Explanation:
ZigBee Channel Spacing: ZigBee channels in the 2.4 GHz band are spaced 5 MHz apart. This helps manage interference in the crowded 2.4 GHz spectrum.
NEW QUESTION # 19
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