Please select 2 correct answers
Explanation:
When a downgrade occurs, the signal strength of a transmitted signal is reduced due to various factors such as attenuation, scattering, and absorption as it travels through the propagation medium. This can result in a weaker signal being received at the destination, and the final received signal will never be stronger than the originally transmitted signal.
Explanation:
A PD (Powered Device) Class 0 device is a type of device that can be powered by a PoE (Power over Ethernet) switch. According to the IEEE 802.3af standard, a PD Class 0 device can draw a maximum power of 15.4 watts from the PoE source.
Explanation:
The Wi-Fi Alliance is an organization that ensures interoperability of WLAN (Wireless Local Area Network) products. The Wi-Fi Alliance is a global nonprofit organization that promotes and certifies Wi-Fi technology.
Explanation:
The ratio between the maximum and minimum peak voltage on a transmission line is known as the Voltage Standing Wave Ratio (VSWR).
VSWR is an essential characteristic of transmission lines and is used to measure power transfer efficiency from a transmitter to a load. When the VSWR is high, it indicates that much of the power is reflected toward the transmitter instead of being transferred to the bag. This can result in signal loss, reduced range, and potential damage to the transmitter.
Please select 3 correct answers
Explanation:
Layer 2 retransmissions result from data packet errors and are used to improve data integrity and network performance. However, there are several negative effects associated with layer two retransmissions:
1. Excessive MAC sublayer overhead: Each retransmission of a data packet results in additional overhead at the MAC sublayer, which can consume valuable bandwidth and reduce the overall network throughput.
2. Increased latency: Retransmissions increase the time it takes for packets to be delivered, leading to higher latency and slower network performance. High latency in a real-time application such as VoIP or video conferencing can cause significant delays and impair communication quality.
3. Jitter: Retransmissions can introduce jitter, which is the variation in packet delay. Jitter can negatively affect real-time applications and cause audio and video to be choppy and distorted.
Therefore, while layer two retransmissions are an important part of network protocols and can improve data integrity and network performance, they should be used judiciously to avoid these negative effects.
Please select 3 correct answers
