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Difficulty: MediumNetwork Components Roles and Functions

An enterprise network administrator is evaluating the operational roles of different hardware and virtual components deployed across a branch office. Which two statements correctly describe the boundary handling and forwarding behaviors of these network components?

  1. Layer 3 switches establish distinct broadcast domains per VLAN and utilize internal routing hardware to forward IP packets between VLANs.Answer
  2. Routers separate broadcast domains at each routed interface and make packet forwarding decisions using destination Layer 3 IP addresses.Answer
  3. C
    Standard Layer 2 switches separate broadcast domains on every physical access port while preserving a single shared collision domain across the chassis.
  4. D
    Bare-metal Type 1 hypervisors require external physical switches to manage and switch Ethernet frame traffic between virtual machines running on the same physical host.

Answer

The statements describing Layer 3 switches establishing distinct broadcast domains per VLAN with internal IP routing, and routers separating broadcast domains per routed interface using destination IP addresses, are both correct.
Layer 3 switches combine switching speed with Layer 3 IP routing functions, creating logical Layer 2 broadcast domains per configured VLAN and routing packets between them using internal Switch Virtual Interfaces (SVIs) or routed ports. Routers function at Layer 3 of the OSI model, naturally preventing broadcast frames from leaking across interfaces, thus isolating broadcast domains and forwarding traffic using network-layer destination IP addresses.

Step-by-Step Solution

1
Analyze the role of Layer 2 switches, Layer 3 switches, and routers regarding collision and broadcast domains.
Layer 2 switches divide collision domains per port but maintain a single broadcast domain. Layer 3 switches use VLANs and internal routing to create and interconnect separate broadcast domains. Routers inherently break broadcast domains at every routed interface.
Understanding domain boundaries is fundamental to identifying the correct operational capabilities of network devices.
2
Evaluate hypervisor virtual switching capabilities.
Type 1 hypervisors implement internal virtual switches (vSwitches) to switch local traffic between VM virtual NICs internally.
Traffic between VMs on the same hypervisor host does not need to exit to an external physical switch unless configured for external monitoring or security policies.
3
Identify the two accurate statements based on the analysis.
The statement regarding Layer 3 switch VLAN routing and the statement regarding router Layer 3 interface forwarding are correct.
Both statements accurately reflect standard Cisco networking principles and hardware component roles.

Key Concept

Network Component Operational Roles and Broadcast Domain Boundaries
Estimated Time:1m 30s
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Topics

Network Components Roles and Functions

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