87 real Networking questions from the Virtualization bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is Standard vSwitch?
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A.a per-host virtual switch
B.A virtual switch security setting that lets a vNIC see all traffic on the port group, needed for nested hypervisors and packet sniffers
C.A template on a virtual switch defining VLAN, security and teaming policy for the VMs connected to it
D.A hypervisor-level firewall (NSX, Flow) that enforces policy on each vNIC, enabling microsegmentation without hairpinning through a physical appliance
A.Standard vSwitch — A vDS capability that dynamically learns guest MAC addresses on a port, required to support nested ESXi and multiple MACs behind one vNIC
B.Standard vSwitch — a per-host virtual switch
C.Standard vSwitch — vDS rules that allow, drop, or DSCP/CoS-tag packets at the port group level for security and QoS.
D.Standard vSwitch — Link-layer discovery protocols that map virtual switch uplinks to physical switch ports and VLANs.
A.Distributed vSwitch (vDS) — Policies (route based on originating port, source MAC, or physical NIC load) that distribute VM traffic across multiple uplinks for bandwidth and redundancy
B.Distributed vSwitch (vDS) — Link-layer discovery protocols that map virtual switch uplinks to physical switch ports and VLANs.
C.Distributed vSwitch (vDS) — a virtual switch managed centrally by vCenter across hosts
D.Distributed vSwitch (vDS) — A virtual switch security setting that lets a vNIC see all traffic on the port group, needed for nested hypervisors and packet sniffers
A.VST mode — Verifies VLAN, MTU, and teaming consistency between the distributed switch and physical switch ports.
B.VST mode — VLAN tagging applied by the vSwitch per port group
C.VST mode — The Data Plane Development Kit: userspace poll-mode drivers that bypass the kernel network stack for line-rate packet processing in NFV virtual switches
D.VST mode — A virtual network adapter presented to a VM (e.g. VMXNET3, virtio-net) that connects to a virtual switch port
A.VGT mode — Remote Direct Memory Access over Converged Ethernet lets hosts move data with minimal CPU and latency, used for vSAN, SMB Direct and live migration
B.VGT mode — A virtual network adapter presented to a VM (e.g. VMXNET3, virtio-net) that connects to a virtual switch port
C.VGT mode — VLAN 4095 trunk where the guest OS handles 802.1Q tagging
D.VGT mode — Verifies VLAN, MTU, and teaming consistency between the distributed switch and physical switch ports.
A.a Hyper-V switch giving VMs and host access to the physical network
B.VLAN 4095 trunk where the guest OS handles 802.1Q tagging
C.A vDS feature subdividing a VLAN into promiscuous, isolated and community secondary VLANs to restrict guest-to-guest traffic within a subnet
D.A hardware feature where one physical NIC exposes multiple virtual functions assignable directly to VMs, bypassing the virtual switch for low latency
A.External virtual switch — a Hyper-V switch giving VMs and host access to the physical network
B.External virtual switch — A virtual network adapter presented to a VM (e.g. VMXNET3, virtio-net) that connects to a virtual switch port
C.External virtual switch — A vDS feature that allocates uplink bandwidth shares to traffic types (vMotion, vSAN, VM, management) to prevent any one from starving others
D.External virtual switch — Allocates distributed switch bandwidth to traffic types (vMotion, vSAN, VM) using shares, limits, and reservations.
A.Private virtual switch — vDS rules that allow, drop, or DSCP/CoS-tag packets at the port group level for security and QoS.
B.Private virtual switch — A virtual switch security setting that lets a vNIC see all traffic on the port group, needed for nested hypervisors and packet sniffers
C.Private virtual switch — Verifies VLAN, MTU, and teaming consistency between the distributed switch and physical switch ports.
D.Private virtual switch — a Hyper-V switch allowing VM-to-VM traffic only
A.Allocates distributed switch bandwidth to traffic types (vMotion, vSAN, VM) using shares, limits, and reservations.
B.The Data Plane Development Kit: userspace poll-mode drivers that bypass the kernel network stack for line-rate packet processing in NFV virtual switches
C.A virtual network adapter presented to a VM (e.g. VMXNET3, virtio-net) that connects to a virtual switch port
D.Policies (route based on originating port, source MAC, or physical NIC load) that distribute VM traffic across multiple uplinks for bandwidth and redundancy
A.A template on a virtual switch defining VLAN, security and teaming policy for the VMs connected to it
B.A vDS feature subdividing a VLAN into promiscuous, isolated and community secondary VLANs to restrict guest-to-guest traffic within a subnet
C.A virtual network adapter presented to a VM (e.g. VMXNET3, virtio-net) that connects to a virtual switch port
D.A hardware feature where one physical NIC exposes multiple virtual functions assignable directly to VMs, bypassing the virtual switch for low latency
23. Which term means: "A vDS feature subdividing a VLAN into promiscuous, isolated and community secondary VLANs to restrict guest-to-guest traffic within a subnet"?
A.Private VLAN (PVLAN) — A vDS feature subdividing a VLAN into promiscuous, isolated and community secondary VLANs to restrict guest-to-guest traffic within a subnet
B.Private VLAN (PVLAN) — The Data Plane Development Kit: userspace poll-mode drivers that bypass the kernel network stack for line-rate packet processing in NFV virtual switches
C.Private VLAN (PVLAN) — Copies traffic from source ports to a destination for packet capture and intrusion detection.
D.Private VLAN (PVLAN) — a per-host virtual switch
A.Policies (route based on originating port, source MAC, or physical NIC load) that distribute VM traffic across multiple uplinks for bandwidth and redundancy
B.Policies like route-by-port-ID, source-MAC-hash, or IP-hash (required for static EtherChannel) spread uplink traffic.
C.A template on a virtual switch defining VLAN, security and teaming policy for the VMs connected to it
D.Exports flow records (src, dst, ports, bytes) from a vDS to a collector for traffic analysis.
A.Policies (route based on originating port, source MAC, or physical NIC load) that distribute VM traffic across multiple uplinks for bandwidth and redundancy
B.A template on a virtual switch defining VLAN, security and teaming policy for the VMs connected to it
C.A vDS capability that dynamically learns guest MAC addresses on a port, required to support nested ESXi and multiple MACs behind one vNIC
D.Policies like route-by-port-ID, source-MAC-hash, or IP-hash (required for static EtherChannel) spread uplink traffic.
29. Which term means: "Policies (route based on originating port, source MAC, or physical NIC load) that distribute VM traffic across multiple uplinks for bandwidth and redundancy"?
A.NIC teaming load balancing — a virtual switch managed centrally by vCenter across hosts
B.NIC teaming load balancing — Allocates distributed switch bandwidth to traffic types (vMotion, vSAN, VM) using shares, limits, and reservations.
C.NIC teaming load balancing — A vDS feature subdividing a VLAN into promiscuous, isolated and community secondary VLANs to restrict guest-to-guest traffic within a subnet
D.NIC teaming load balancing — Policies (route based on originating port, source MAC, or physical NIC load) that distribute VM traffic across multiple uplinks for bandwidth and redundancy
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