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.

• ✓

  802.1Q

  Why this is correct

  IEEE 802.1Q is the industry standard for Virtual Local Area Network (VLAN) tagging, essential for enabling multiple VLANs to traverse a single physical link, known as a trunk port, between switches. It inserts a 4-byte tag into the Ethernet frame header, identifying the VLAN to which the frame belongs. This allows switches to properly forward traffic to the correct VLAN segment on the receiving end, effectively segmenting network traffic while utilizing shared physical infrastructure.

• ✗

  802.1X

  Why it's wrong here

  IEEE 802.1X is a port-based network access control standard primarily used for authenticating devices attempting to connect to a wired or wireless network. It ensures that only authorized users and devices can gain access to network resources, often leveraging an authentication server like RADIUS. While 802.1X can dynamically assign a device to a specific VLAN *after* successful authentication, it does not define the mechanism for VLAN tagging on trunk links between switches; its core function is access control.

  When this WOULD be correct

  A network technician needs to implement secure access control on a switch port to authenticate devices before granting network access. Which protocol should be used?

• ✗

  802.11

  Why it's wrong here

  IEEE 802.11 defines the standards for wireless local area networks (WLANs), commonly known as Wi-Fi. It governs aspects like radio frequencies, modulation techniques, and security protocols for wireless communication. This standard is entirely unrelated to establishing wired connections between network switches or implementing VLAN tagging on Ethernet trunk links, making it an incorrect choice for this scenario.

  When this WOULD be correct

  When a question asks which standard defines wireless LAN communication, such as 'Which IEEE standard is used for Wi-Fi networks?'

• ✗

  802.3

  Why it's wrong here

  IEEE 802.3 specifies the physical and data link layer standards for wired Ethernet networks, encompassing aspects like frame format, cabling, and signaling. While it forms the foundation for Ethernet communication between devices, the base 802.3 standard itself does not include mechanisms for VLAN identification or tagging. Without the additional 802.1Q encapsulation, an 802.3 frame cannot carry VLAN information across a trunk link, thus failing to support multiple VLANs between switches.

  When this WOULD be correct

  A question asking which standard defines the basic frame format for Ethernet networks, such as 'Which IEEE standard specifies the frame format for wired Ethernet?' would have 802.3 as the correct answer.

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?”

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