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Difficulty: MediumVirtualization Fundamentals

A network administrator is configuring virtual networking on a bare-metal hypervisor host equipped with redundant physical network interface cards (pNICs). The host accommodates multiple virtual machines (VMs) belonging to different department networks. Which two statements accurately describe the forwarding and operational characteristics of a virtual switch (vSwitch) in this environment? (Select two.)

  1. Intra-host traffic between virtual machines on the same VLAN is switched internally by the vSwitch without egressing to the physical network interface.Answer
  2. Port groups on the vSwitch allow administrators to apply network policies and VLAN tags to isolate traffic from distinct groups of virtual interfaces.Answer
  3. C
    The vSwitch depends on a host underlying operating system kernel to route and process frame headers between virtual machine interfaces.
  4. D
    The vSwitch actively participates in Spanning Tree Protocol (STP) elections by exchanging BPDUs with connected physical access switches.

Answer

The correct statements are that intra-host traffic between virtual machines on the same VLAN is switched internally by the vSwitch without egressing to the physical network interface, and port groups on the vSwitch allow administrators to apply network policies and VLAN tags to isolate traffic from distinct groups of virtual interfaces.
Virtual switches (vSwitches) operate inside the hypervisor to provide Layer 2 connectivity for virtual machines. When two VMs on the same physical host communicate within the same VLAN, the vSwitch forwards traffic locally in system memory, avoiding unnecessary transmission over physical NICs. Additionally, port groups on a vSwitch act as logical switchport configurations, allowing network administrators to define VLAN tags, traffic shaping, and security policies for connected vNICs.

Step-by-Step Solution

1
Analyze how virtual switches handle local VM-to-VM communication on the same physical host.
Recognize that when two VMs are on the same host and VLAN, the vSwitch forwards frames directly between virtual ports inside memory without sending frames out through the physical network interface cards (pNICs).
This reduces physical link utilization and optimizes intra-host throughput.
2
Evaluate how logical segment isolation and policy enforcement are managed on a virtual switch.
Identify that vSwitches use port groups to group virtual machine network interfaces (vNICs) and assign configuration settings such as 802.1Q VLAN IDs and security settings.
Port groups act as logical access ports or trunks to enforce traffic isolation per tenant or department.
3
Evaluate incorrect assertions regarding Type 1 hypervisor architecture and Spanning Tree Protocol.
Dismiss the ideas that a Type 1 hypervisor relies on a standard host operating system network stack or that vSwitches participate in Spanning Tree Protocol (STP) BPDU exchanges.
Type 1 hypervisors run directly on hardware, and standard vSwitches do not run STP or form loops because they do not forward frames between physical uplinks.

Key Concept

Virtual Switch Architecture and Traffic Forwarding
Estimated Time:1m 30s
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Topics

Virtualization Fundamentals

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