N10-009 Network Implementation Practice Question

Answer analysis

Option-by-option breakdown

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

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  A) 802.11b

  Why it's wrong here

  802.11b operates exclusively within the highly congested 2.4 GHz frequency band, limiting its utility for a network requiring dual-band support. With a maximum theoretical throughput of only 11 Mbps, it is significantly slower than newer standards and is considered obsolete for modern deployments. Therefore, it cannot meet the requirement to support both 2.4 GHz and 5 GHz.

  When this WOULD be correct

  If the question asked for a standard that supports only the 2.4 GHz band and provides the longest range among early Wi-Fi standards, 802.11b would be correct.

• ✗

  B) 802.11g

  Why it's wrong here

  802.11g exclusively utilizes the 2.4 GHz frequency band, offering a maximum theoretical throughput of 54 Mbps, which was a significant improvement over 802.11b. Although it provides backward compatibility with 802.11b devices, its inability to operate in the 5 GHz band makes it unsuitable for a network needing to support both 2.4 GHz and 5 GHz simultaneously. This single-band limitation directly contradicts the question's requirement.

  When this WOULD be correct

  This option would be correct if the question asked for a standard that operates solely on the 2.4 GHz band and provides backward compatibility with 802.11b devices, without requiring 5 GHz support.

• ✓

  C) 802.11n

  Why this is correct

  802.11n is the correct choice because it was the first widely adopted Wi-Fi standard to natively support operation in both the 2.4 GHz and 5 GHz frequency bands. This dual-band capability, combined with its use of Multiple-Input Multiple-Output (MIMO) technology, allows it to deliver significantly higher throughput and better range than its predecessors, fulfilling the requirement for both frequency bands.

• ✗

  D) 802.11ac

  Why it's wrong here

  802.11ac is designed to operate solely within the 5 GHz frequency band, leveraging wider channels and more spatial streams for very high throughput. While it offers superior speed and less interference in the 5 GHz spectrum, its exclusive operation in this band means it inherently lacks support for 2.4 GHz devices. Consequently, it fails to meet the fundamental requirement of supporting both frequency bands.

  When this WOULD be correct

  This option would be correct for a question asking which standard supports higher throughput on the 5 GHz band only, such as 'Which IEEE 802.11 standard supports up to 1.3 Gbps using 5 GHz and MU-MIMO?'

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”