220-1201 Practice Question: A customer complains that their wireless network…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  The router is too far from the devices

  Why it's wrong here

  While excessive physical distance between a router and devices can lead to a weak signal and reduced throughput, the primary symptom would often be a complete loss of connection or extremely low signal strength. A general complaint of a "slow" network, especially in a dense environment like an apartment building, points more directly to factors like channel congestion or external interference rather than just signal attenuation over distance, assuming devices are still within a functional, albeit distant, range. Signal strength issues manifest differently than channel saturation.

• ✗

  The router's firmware is outdated

  Why it's wrong here

  Outdated router firmware can indeed lead to various performance problems, including security vulnerabilities, stability issues, or inefficient handling of network traffic. However, in a scenario where the complaint is specifically about a "slow" wireless network, particularly in a dense environment, co-channel interference is a more immediate and common cause than a general firmware deficiency. Firmware updates are important for security and bug fixes, but they are less likely to be the root cause of widespread slowness due to environmental factors.

• ✓

  There is interference from other wireless networks on the same channel

  Why this is correct

  In densely populated areas, numerous Wi-Fi networks often operate within close proximity, frequently sharing the same limited number of non-overlapping channels (e.g., 1, 6, 11 for 2.4 GHz). When multiple access points transmit on the same channel, they create co-channel interference, forcing devices to retransmit data and contend for airtime. This contention significantly reduces effective throughput and leads to a perception of a "slow" network, as devices spend more time waiting or re-sending packets.

• ✗

  The router is using 5 GHz instead of 2.4 GHz

  Why it's wrong here

  The 5 GHz band generally offers higher data rates and significantly more non-overlapping channels compared to the 2.4 GHz band, making it less susceptible to interference from neighboring networks. Therefore, a router utilizing 5 GHz would typically provide a faster and more reliable connection, not a slower one, assuming devices are within its shorter effective range. Switching to 5 GHz is often a recommended solution for slow 2.4 GHz networks, not a cause of slowness itself, unless the device is too far for a stable 5 GHz connection.

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