Sure, E can work, but what does it do that a virtual switch cant? VMs can talk with no external switch involved.
with B, its possible with Nexus1000v, or CSR1000v
A.B for me.
But B is saying that the VM is acting as the virtual switch. The virtual switch is used to allow VMs to communicate with each other. It does not make sense to have a VM as a virtual switch. The question does not designate that traffic needs to stay within the hypervisor. It just states that the VMs happen to be in the same hypervisor. B is ruled out for me based on the VM acting as a virtual switch. VMs typically act as routers or provide other network services (i.e. firewall, IPS, DNS server, etc.), not switches.
A. Use a virtual switch provided by the hypervisor:
Hypervisors (like VMware ESXi, Hyper-V, etc.) include built-in virtual switches (vSwitches).
These vSwitches operate at Layer 2 and allow VMs on the same hypervisor to communicate with each other using MAC addresses, just like physical switches.
This is the most common and efficient way to provide Layer 2 connectivity between VMs on the same host.
E. Use a single trunk link to an external Layer 2 switch:
You can connect a vSwitch to a physical Layer 2 switch using a trunk link.
This allows VMs on the hypervisor to communicate with devices (physical or virtual) connected to the external switch, while still maintaining Layer 2 separation through VLANs.
The trunk link carries traffic for multiple VLANs, enabling controlled Layer 2 communication
page 12 from OCG:
"Thanks to the introduction of virtualization, some servers run a hypervisor for the operating system and contain a virtualized switch with different VLANs. These servers also provide connectivity via a trunk port".
A and B don't need additional hardware and cabling, the hypervisor can take care of both scenarios.
In a question related to virtualization *within the same hypervisor* why in the world would you go with E?
The two actions that provide controlled Layer 2 network connectivity between virtual machines running on the same hypervisor are:
A. Use a virtual switch provided by the hypervisor.
B. Use a virtual switch running as a separate virtual machine.
A and B are the correct answers.
VXLAN fabric, a single routed link to an external router on stick, and a single trunk link to an external Layer 2 switch are all network connectivity solutions, BUT THEY ARE NOT specifically designed for providing controlled Layer 2 network connectivity between virtual machines running on the same hypervisor.
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