N10-009 Networking Concepts 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.

• ✗

  It forwards data based on IP addresses.

  Why it's wrong here

  Forwarding data based on IP addresses is a function performed at Layer 3 (the Network Layer) of the OSI model, primarily by a router or a Layer 3 switch. A standard Layer 2 network switch, which is the context of a 'network switch' in basic networking, does not inspect or utilize IP addresses for its fundamental forwarding decisions. Its operations are confined to the data link layer, where MAC addresses are the key identifiers for frame delivery within a local segment, not network-level routing.

  When this WOULD be correct

  This option would be correct if the question asked about the primary function of a router or a Layer 3 switch in a network, where forwarding decisions are made based on IP addresses.

• ✓

  It forwards data based on MAC addresses.

  Why this is correct

  A network switch, operating at Layer 2 of the OSI model, intelligently forwards data frames based on the destination Media Access Control (MAC) address found in the frame header. The switch dynamically learns the MAC addresses of connected devices by inspecting incoming frames and populates its MAC address table, also known as a CAM table. When a frame arrives, the switch consults this table to send the frame only to the specific port where the destination MAC address is known to reside. This intelligent forwarding significantly reduces unnecessary network traffic and segments collision domains, improving overall network performance.

• ✗

  It connects different networks and performs routing.

  Why it's wrong here

  Connecting disparate networks and performing routing functions are the core responsibilities of a network router, not a typical Layer 2 switch. A router operates at Layer 3 of the OSI model, using IP addresses to determine optimal paths for packets to travel between different broadcast domains or subnets. While some advanced Layer 3 switches can perform routing, the fundamental role of a 'network switch' is to connect devices within the same local network segment, not to bridge different networks.

  When this WOULD be correct

  This option would be correct for a question like: 'Which device connects different networks and makes forwarding decisions based on IP addresses?' In that context, describing a router's function would be accurate.

• ✗

  It amplifies and repeats the signal to all ports.

  Why it's wrong here

  This statement accurately describes the behavior of a network hub, a rudimentary Layer 1 device. A hub simply receives an electrical signal on one port and regenerates, then broadcasts, that signal out to all other connected ports without any intelligence. This creates a single large collision domain, leading to inefficient network traffic as every device receives all frames, regardless of the intended recipient, which is fundamentally different from a switch's operation.

  When this WOULD be correct

  In a question about the function of a hub or repeater, such as 'Which device regenerates and broadcasts signals to all ports?'

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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