VCP-DCV Configure and Manage vSphere Networking Practice Test 2 — 15 Questions

Question 1

An administrator needs to ensure that virtual machines can be migrated between ESXi hosts using vMotion. The virtual machines are connected to a standard vSwitch port group named 'Production'. What must be consistent across all hosts?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Port group name 'Production'. VMotion requires the same port group name on source and target host. Option B is incorrect because MTU may differ if not using jumbo frames. Option C is incorrect because number of uplinks can vary. Option D is incorrect because load balancing policy does not affect vMotion compatibility.

Answer

MTU size

Answer

Number of uplinks

Answer

Load balancing policy

Question 2

An administrator has enabled jumbo frames (MTU 9000) on a vSphere Distributed Switch. Virtual machines on different hosts cannot communicate, but VMs on the same host can. The physical switches support jumbo frames. What is the most likely cause?

Accepted Answer

The physical NICs are not configured with MTU 9000.. For jumbo frames to work end-to-end, every device in the path must support an MTU of 9000, including the physical NICs (vmnic) on the ESXi hosts. If the physical NICs are left at the default 1500, packets larger than 1500 will be fragmented or dropped, preventing communication between VMs on different hosts. The distributed switch and port group MTU settings alone are insufficient.

Answer

The physical switch QoS is misconfigured.

Answer

The VMkernel adapters are still using default MTU.

Answer

The distributed switch port group MTU is set to 1500.

Question 3

An administrator is configuring a vSphere Standard Switch. Which two settings are essential for basic network connectivity of virtual machines?

Accepted Answer

Port group name. A port group name (Option A) is essential because a vSphere Standard Switch requires at least one port group to which virtual machines' vNICs connect; the port group is the logical container that provides the network attachment point and must be named to be created and referenced. A VLAN ID (Option E) is also essential in this scenario because it defines the 802.1Q VLAN tagging for traffic on that port group, determining which broadcast domain the VM's traffic belongs to and enabling proper Layer 2 segmentation and connectivity. The MTU (Option B), network adapter type (Option C), and security policy (Option D) are not essential for basic connectivity: MTU defaults to 1500 and only matters for jumbo frames, the adapter type is chosen on the VM's virtual hardware rather than the switch and defaults work fine, and security policy settings (promiscuous mode, MAC address changes, forged transmits) affect filtering behavior rather than basic reachability.

Answer

MTU

Answer

Network adapter type (e.g., E1000)

Answer

Security policy

Question 4

An administrator is troubleshooting network connectivity for a virtual machine connected to a vSphere Distributed Switch. Which three components must be properly configured for the VM to communicate with the external network?

Accepted Answer

Physical NIC uplink. Option B (Physical NIC uplink) is correct because the vmnic assigned to the Distributed Switch provides the actual physical path from the host to the external network; without a properly configured uplink, traffic cannot leave the host. Option C (Distributed switch uplink port group) is correct because the uplink port group defines the teaming, failover, and VLAN policies that bind physical NICs to the Distributed Switch and carry traffic to the physical network. Option E (Physical switch port configuration) is correct because the upstream physical switch ports must be configured consistently with the Distributed Switch settings (for example, matching VLAN tagging, trunking, and MTU) for frames to be forwarded externally. Option A (VM's IP address) is not required for basic Layer 2 communication to the external network, since connectivity can exist without an IP address and IP configuration is a guest-level concern. Option D (VM's network adapter driver) is not a Distributed Switch component that must be configured for external connectivity; the driver is part of the guest OS and is not a switch-side requirement.

Answer

VM's IP address

Answer

VM's network adapter driver

Question 5

An administrator needs to implement Network I/O Control (NIOC) on a vSphere Distributed Switch to guarantee bandwidth for vSphere Replication traffic. Which two actions are required?

Accepted Answer

Enable NIOC on the distributed switch.. Option A is correct because Network I/O Control must first be enabled on the vSphere Distributed Switch (via the dvSwitch Settings > Resource Allocation or the vSphere Client's NIOC toggle) before any bandwidth reservations or shares can be enforced on that switch. Option B is correct because guaranteeing bandwidth for a specific traffic type such as vSphere Replication requires creating a user-defined network resource pool on the distributed switch, since the default system resource pools only cover built-in traffic types (Fault Tolerance, iSCSI, NFS, vMotion, vSphere Replication, Virtual Machine, Management) and a custom pool is needed to apply a dedicated reservation to the replication traffic. Option C is incorrect because traffic shaping on a VMkernel adapter controls average bandwidth, peak bandwidth, and burst size for egress traffic; it does not provide the guaranteed bandwidth reservation mechanism that NIOC resource pools deliver. Option D is incorrect because VLAN separation is a traffic-isolation practice and is not a requirement for enabling or enforcing NIOC bandwidth guarantees. Option E is incorrect because vSphere Replication traffic is classified into the system-defined vSphere Replication resource pool automatically; you do not manually assign the VMkernel adapter to a resource pool as a required NIOC configuration step.

Answer

Set the replication VMkernel adapter's traffic shaping to guaranteed.

Answer

Configure the replication network on a separate VLAN.

Answer

Assign the vSphere Replication VMkernel adapter to the resource pool.

Question 6

An administrator has configured jumbo frames on a VDS and all physical switches. Virtual machines on different hosts can ping each other but cannot transfer files larger than 1500 bytes. What is the most likely cause?

Accepted Answer

The virtual machine's operating system MTU is set to 1500.. Jumbo frames require end-to-end MTU consistency. The VDS, physical switches, and physical NICs are configured for 9000, but if the guest OS inside the VM still has its vNIC MTU at 1500, the VM will fragment or drop large packets — which matches the symptom of ping (small packets) working while large file transfers fail.

Answer

The physical NICs are not configured for jumbo frames.

Answer

The TCP/IP offload engine is causing fragmentation.

Answer

The VMkernel adapters are not configured with MTU 9000.

Question 7

An administrator is configuring LACP on a VDS with two uplinks. Which configuration must match between the VDS and the physical switch?

Accepted Answer

All of the above.. For LACP on a VDS to work, the LACP mode (active/passive), the LACP rate (slow/fast), and the LACP port key (the LAG identifier) must all match between the VDS and the physical switch. Any mismatch prevents the LAG from forming or causes inconsistent behavior.

Answer

LACP mode (active/passive).

Answer

LACP rate (slow/fast).

Answer

LACP port key.

Question 8

A vSphere environment uses a vSphere Distributed Switch (vDS) with 10G uplinks and Network I/O Control (NIOC) enabled. Administrators report that during peak traffic, NFS storage traffic is experiencing high latency, while other traffic types remain unaffected. The vDS has default NIOC shares and limits. Which action should be taken to prioritize NFS traffic without completely starving other traffic?

Accepted Answer

Increase the shares for the NFS traffic class.. Increasing the shares for the NFS traffic class gives it a higher proportion of bandwidth during contention, without imposing a hard limit. Option A is incorrect because setting a low bandwidth limit would cap NFS traffic, potentially worsening performance. Option C is incorrect because setting a high bandwidth reservation could reserve bandwidth for NFS even when not needed, potentially wasting resources, and does not prioritize dynamically like shares do. Option D is incorrect because disabling NIOC removes all traffic prioritization, eliminating the ability to differentiate NFS traffic.

Answer

Set a low bandwidth limit for the NFS traffic class.

Answer

Set a high bandwidth reservation for the NFS traffic class.

Answer

Disable Network I/O Control on the vDS.

Question 9

An organization has deployed a vSphere Distributed Switch (vDS) across multiple ESXi hosts. The security team requires that no virtual machine can change its MAC address to impersonate another device. Which security policy setting on the distributed port group should be configured to fulfill this requirement?

Accepted Answer

Set 'Forged transmits' to 'Reject'.. The 'Forged transmits' policy controls whether a VM can send frames with a source MAC address that differs from the one assigned to its vNIC. Setting it to 'Reject' prevents MAC spoofing and impersonation. 'MAC address changes' governs whether the guest OS can change the MAC inside the VM, which is a different attack vector.

Answer

Set 'MAC address changes' to 'Reject'.

Answer

Set 'Promiscuous mode' to 'Reject'.

Answer

Enable traffic shaping and set a low average bandwidth.

Question 10

A vSphere administrator needs to provide redundancy for VM traffic on a vSphere Standard Switch by using multiple physical uplinks. Which teaming configuration should be used to ensure that if one uplink fails, traffic automatically fails over to another?

Accepted Answer

Set load balancing to 'Route based on originating virtual port' and make one uplink active and one standby.. On a vSphere Standard Switch, the default and most reliable way to provide failover redundancy with multiple uplinks is to use 'Route based on originating virtual port' with one uplink active and one standby. If the active uplink fails, the standby is promoted automatically, preserving VM traffic. This is the standard active/standby teaming configuration for redundancy on a Standard Switch.

Answer

Set load balancing to 'Route based on IP hash' and make both uplinks active.

Answer

Enable 'Use explicit failover order' and configure 'Network failures' detection.

Answer

Set load balancing to 'Explicit failover order' and set one uplink as active.

Question 11

A vSphere administrator is configuring Network I/O Control (NIOC) on a vSphere Distributed Switch to prioritize vMotion traffic during maintenance windows. The environment has three system traffic classes: Management, NFS, and vMotion. The administrator wants to ensure that when the network is congested, vMotion gets at least 50% of the available bandwidth, while Management and NFS each get at least 25%. Which NIOC configuration achieves this?

Accepted Answer

Set the vMotion traffic class shares to 50, Management shares to 25, and NFS shares to 25.. Shares allocate bandwidth proportionally during contention. Setting the vMotion shares to 50, Management to 25, and NFS to 25 ensures that vMotion receives 50% of available bandwidth when all traffic classes are congested, while Management and NFS each get 25%. Option A is incorrect because limits cap bandwidth and do not guarantee proportional allocation; they would restrict vMotion to at most 500 Mbps regardless of available bandwidth. Option C is incorrect because reservations guarantee a minimum bandwidth but do not enforce proportional sharing during congestion; they would ensure each class gets at least the reserved amount but not necessarily the desired percentages when the total bandwidth exceeds the sum of reservations. Option D is incorrect because without NIOC, all traffic classes are treated equally, so vMotion would not get prioritized bandwidth.

Answer

Set a limit of 500 Mbps for Management and NFS, and no limit for vMotion.

Answer

Set a reservation of 500 Mbps for vMotion, 250 Mbps for Management, and 250 Mbps for NFS.

Answer

Do nothing; NIOC is not needed because all traffic types are equally important.

Question 12

An administrator is troubleshooting an issue where a VM on a vSphere Distributed Switch cannot receive traffic from outside its subnet. The VM can send traffic out and receive replies from hosts on the same subnet. The default gateway is configured correctly. What is the most likely cause?

Accepted Answer

The router does not have a route back to the VM's subnet.. The VM can send traffic outbound and receive replies from hosts on the same subnet, which confirms the VM's NIC, port group, VLAN, and local L2 connectivity are all working. The failure is specifically with traffic from outside the subnet, meaning the return path from the remote router back to the VM's subnet is missing. If the router does not have a route back to the VM's subnet, replies from remote hosts will be dropped, producing exactly this asymmetric behavior.

Answer

The VXLAN Tunnel Endpoint (VTEP) IP is not reachable from the remote subnet.

Answer

The ESXi host's default gateway is misconfigured.

Answer

The port group VLAN ID is different from the physical switch trunk allowed VLAN.

Question 13

A virtual machine is configured with two vNICs connected to different standard port groups (VLAN 10 and VLAN 20). The administrator wants to use both vNICs for load balancing and failover within the VM OS. Which condition must be met on the vSwitch side?

Accepted Answer

Configure NIC teaming within the guest operating system.. To use both vNICs for load balancing and failover within the VM OS, the condition that must be met on the vSwitch side is that NIC teaming must be configured within the guest operating system. This means the guest OS handles the teaming, and the vSwitch simply passes traffic from each vNIC to its respective port group. The vSwitch does not need to be configured for teaming across the two port groups; that would be done at the guest level.

Answer

Enable MAC address changes on both port groups.

Answer

Configure teaming on the standard switch by bridging the two port groups.

Answer

Set load balancing to 'Route based on IP hash' on both port groups.

Question 14

A vSphere administrator notices that after adding a new ESXi host to a vSphere Distributed Switch (vDS), some VMs on existing hosts lose network connectivity intermittently. What is the most likely cause?

Accepted Answer

The vDS MTU setting does not match the physical network MTU.. A mismatch between the vDS MTU and the physical network MTU causes large frames (e.g., jumbo frames or VXLAN-encapsulated traffic) to be silently dropped by the physical switch. When a new host is added, its uplinks inherit the vDS MTU, and if the upstream physical switch ports are not configured for the same MTU, intermittent connectivity failures occur for VMs on existing hosts that rely on those paths. This is the most likely cause because it directly affects traffic flow across the entire vDS, not just the new host.

Answer

The new host's physical uplink is faulty, causing broadcast storms.

Answer

The vDS is configured with LACP, and the new host's links are not properly bundled.

Answer

The vDS Network I/O Control settings are not evenly distributed.

Question 15

Which TWO of the following are valid considerations when configuring a vSphere Distributed Switch with 10G uplinks and planning for a TCP/IP stack for vMotion? (Select exactly two.)

Accepted Answer

Enable vMotion to use a separate TCP/IP stack to avoid competing with management traffic.. Option B is correct because vSphere allows a dedicated vMotion TCP/IP stack, which isolates vMotion traffic from the default stack used by management, preventing contention and allowing independent routing and gateway configuration. Option E is correct because a vMotion TCP/IP stack only becomes functional when at least one VMkernel adapter is assigned to it, so a dedicated VMkernel interface must be created and bound to that stack. Option A is incorrect because the default TCP/IP stack supports only a single default gateway, so multiple gateways for vMotion cannot be configured on it. Option C is incorrect because jumbo frames are a general MTU setting on the VMkernel adapter or vSwitch, not a property of the vMotion TCP/IP stack itself, and are not a defining consideration for the stack. Option D is incorrect because the provisioned TCP/IP stack is reserved for vSphere Provisioning (Auto Deploy and host provisioning) traffic, not vMotion, and it does not provide storage traffic isolation.

Answer

Configure the default TCP/IP stack to handle vMotion traffic with multiple gateways.

Answer

Enable jumbo frames on the vMotion TCP/IP stack to improve performance.

Answer

Use the provisioned TCP/IP stack for vMotion to leverage storage traffic isolation.