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.

• ✓

  STP (Spanning Tree Protocol)

  Why this is correct

  Spanning Tree Protocol (STP) is fundamental for Layer 2 network stability, actively preventing switching loops that arise from redundant physical paths. It achieves this by dynamically placing specific ports into a blocking state, ensuring only one active logical path exists between any two network segments. This process, managed through Bridge Protocol Data Units (BPDUs), creates a loop-free tree topology, eliminating broadcast storms and MAC address table instability while still providing path redundancy in case of a link failure.

• ✗

  OSPF (Open Shortest Path First)

  Why it's wrong here

  Open Shortest Path First (OSPF) is a sophisticated interior gateway routing protocol operating at Layer 3 of the OSI model, responsible for dynamically determining the most efficient paths for IP packet forwarding within an autonomous system. Its function is to build and maintain routing tables based on network topology and link costs, enabling routers to make informed decisions about where to send data. OSPF is entirely distinct from Layer 2 switching mechanisms and does not play any role in preventing broadcast storms or MAC table corruption caused by physical loops in a switched network.

  When this WOULD be correct

  A network administrator is designing a multi-area network with redundant Layer 3 paths between routers. Which protocol should be implemented to ensure loop-free routing and fast convergence?

• ✗

  VRRP (Virtual Router Redundancy Protocol)

  Why it's wrong here

  Virtual Router Redundancy Protocol (VRRP) is a high-availability protocol that provides default gateway redundancy for end devices on a local area network. It allows multiple routers to share a single virtual IP address and MAC address, ensuring that if the primary router fails, a backup router can seamlessly take over the gateway function. VRRP operates at Layer 3 and addresses router availability, but it does not prevent Layer 2 switching loops that can occur between interconnected switches within the same broadcast domain.

  When this WOULD be correct

  A network administrator is designing a network with multiple routers providing default gateway services. Which protocol should be implemented to ensure high availability of the default gateway?

• ✗

  LACP (Link Aggregation Control Protocol)

  Why it's wrong here

  Link Aggregation Control Protocol (LACP) is designed to bundle multiple physical Ethernet links into a single logical channel, primarily to increase bandwidth and provide link-level redundancy within that aggregated bundle. While it offers resilience for the aggregated link itself, LACP does not address or prevent Layer 2 switching loops that occur when multiple independent paths exist between different switches in the network. It operates by creating one logical link, not by managing a loop-free topology across an entire switched domain.

  When this WOULD be correct

  A network administrator needs to increase bandwidth and provide redundancy between two switches by combining multiple physical links into a single logical link. The correct protocol to implement would be LACP.

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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