VCP-DCV Configure and Manage vSphere Networking Practice Test 5 — 15 Questions

Question 1

A large financial organization has a vSphere cluster with 10 ESXi hosts (8.x) connected to a pair of Nexus 9000 switches via two 10G LACP link aggregation groups (LAGs) per host. Each host has a vSphere Distributed Switch (vDS 7.0.3) with two LAGs (LAG1: vmnic0, vmnic1; LAG2: vmnic2, vmnic3). The vDS has three port groups: Production (VLAN 100-200), DMZ (VLAN 300), and Storage (VLAN 400). The port groups use LACP with load balancing 'Route based on IP hash'. Recently, the network team changed the physical switch port channels from mode 'active' to 'passive' on the downstream ports connected to host #3, without informing the virtualization team. Within hours, VMs on host #3 experience intermittent connectivity; some can communicate but others cannot, and vMotion between host #3 and other hosts fails with a network unreachable error. iSCSI storage traffic from host #3 is also unstable. The administrator verifies that the vDS LACP configuration on host #3 still expects 'active' mode. Which of the following actions is the most effective to restore full functionality while maintaining LACP?

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

Accepted Answer

Remove and recreate the LAGs on host #3's vDS after verifying the physical switch's LACP configuration.. The root cause is a mismatch between the vDS LACP mode (active) and the physical switch's LACP mode (passive). Simply recreating the LAGs after verifying the switch configuration ensures both sides agree on the LACP mode, restoring proper negotiation and traffic flow. This maintains the existing LACP-based load balancing and avoids disrupting the rest of the cluster.

Answer

Change the LACP mode on host #3's vDS from 'active' to 'passive' for both LAGs.

Answer

Disable LACP on host #3's vDS and use static EtherChannel instead.

Answer

Replace the vDS with multiple standard switches and use active/standby failover.

Question 2

A vSphere administrator needs to provide network connectivity to a set of VMs that must be isolated from all other traffic on the physical network. The VMs are on the same ESXi host and require maximum throughput between them. Which vSphere networking solution should the administrator use?

Accepted Answer

Create a standard switch with an internal-only port group (no uplinks). A standard switch with no uplinks creates an internal-only network that provides isolation and maximum throughput as traffic stays within the ESXi host memory. Option A requires uplinks and VLAN configuration, allowing potential traffic exposure. Option B requires physical switch support for private VLANs and still uses uplinks. Option C incorrectly uses a VMkernel NIC, which is for management traffic, not VM data.

Answer

Create a distributed switch with a private VLAN

Answer

Create a standard switch with a VLAN-backed port group

Answer

Create a standard switch with a VMkernel NIC for inter-VM communication

Question 3

A vSphere administrator notices that VMs on a specific ESXi host lose connectivity intermittently. The VMs are on a distributed switch port group. The administrator finds that the Uplink 1 on that host is down. What should the administrator do first?

Accepted Answer

Check the physical switch port configuration for the failed uplink. The first step is to verify the physical switch port configuration for the failed uplink. The physical switch port may be misconfigured, disabled, or have a faulty cable. Checking this directly addresses the root cause of the down uplink. Option A (increasing uplinks) would be premature without understanding why the uplink failed. Option C (changing load balancing) and Option D (changing failover order) are potential workarounds but do not fix the down uplink itself. Therefore, the administrator should first check the physical switch port configuration.

Answer

Increase the number of uplinks in the teaming policy

Answer

Set the load balancing policy to Route based on source MAC

Answer

Configure a different failover order

Question 4

Which two actions must the administrator take to ensure network connectivity for VMs on a new distributed switch?

Accepted Answer

Add the ESXi hosts to the distributed switch. The correct answers are B and D. Adding ESXi hosts to the distributed switch (B) is required for them to use the switch and manage VMs. Creating a port group with a VLAN assignment (D) provides the necessary network connectivity for VMs. Option A (configuring a VMkernel interface) is for host management traffic, not VM connectivity. Option C (setting MTU to 9000) is optional for jumbo frames and not required. Option E (enabling Network I/O Control) is for QoS and not needed for basic connectivity.

Answer

Configure a VMkernel interface on the distributed switch

Answer

Set the MTU to 9000

Answer

Enable Network I/O Control

Question 5

Which four types of traffic can be assigned to a separate VMkernel adapter on an ESXi host?

Accepted Answer

Management traffic. The correct answers are A, B, C, and E. VMkernel adapters are used for system traffic such as management, vMotion, vSAN, and Fault Tolerance logging. Management traffic (A) handles host communication, vMotion (B) supports live migration, vSAN (C) provides storage traffic, and Fault Tolerance logging (E) is used for FT logging and can be assigned to a separate VMkernel adapter for performance and isolation. Virtual machine network traffic (D) uses standard or distributed port groups, not VMkernel adapters.

Answer

Virtual machine network traffic

Question 6

A company has a single ESXi host with a standard switch. The administrator creates a new port group for a DMZ network and assigns a VM to it. The VM cannot ping the default gateway. The physical switch port is configured as a trunk with VLAN 100 allowed. The port group VLAN ID is set to 100. The physical NIC is connected to the switch port and shows link up. What should the administrator do to resolve the issue?

Accepted Answer

Verify the VM's IP configuration. The physical and virtual networking configurations appear correct (VLAN 100 on both sides, link up), so the issue is likely an IP misconfiguration on the VM itself. Option A (enable VLAN tagging on the physical switch port) is unnecessary as the port group already tags VLAN 100. Option B (change VLAN ID to 0) would break connectivity. Option D (add a second physical NIC to the standard switch) does not address the connectivity problem.

Answer

Enable VLAN tagging on the physical switch port

Answer

Change the VLAN ID to 0

Answer

Add a second physical NIC to the standard switch

Question 7

An organization uses a VDS with 4 hosts. They want to use Network I/O Control (NIOC) to prioritize vMotion traffic over management traffic. After configuring NIOC, the administrator notices that vMotion performance is not improved. What could be the cause?

Accepted Answer

The vMotion VMkernel adapter is not assigned to the correct network resource pool. NIOC uses network resource pools to apply QoS policies. If the vMotion VMkernel adapter is not assigned to the appropriate network resource pool (e.g., vMotion pool), NIOC will not prioritize vMotion traffic. Option B is incorrect because oversubscribed uplinks can cause congestion but do not prevent NIOC from working; NIOC would still apply its shares to the traffic. Option C is incorrect because NIOC does not rely on CoS tags; it uses shares and limits defined in resource pools. Option D is incorrect because the administrator configured NIOC, implying it is enabled; if it were not enabled, no NIOC functionality would be available.

Answer

The physical uplinks are oversubscribed

Answer

The vMotion traffic is not marked with the appropriate CoS tag

Answer

NIOC is not enabled on the VDS

Question 8

After upgrading the physical switches, the LAG (Link Aggregation Group) on a VDS does not come up. The VDS LAG configuration shows LACP active mode. The physical switch ports are configured with LACP active mode as well. What is the most likely cause?

Accepted Answer

The physical switch ports are not in a port-channel. For a LAG to form, the physical switch ports must be configured as a port-channel or etherchannel. Even if both sides are set to LACP active, the switch ports must first be grouped into a port-channel interface; otherwise, LACP negotiations will not complete. Option A is incorrect because the system priority affects LACP role but does not prevent LAG formation if both sides are active. Option C is incorrect because LAG IDs are not relevant across hosts; each host's LAG is independent. Option D is incorrect because the hashing algorithm does not affect LACP negotiation; it only affects load distribution.

Answer

The physical switch uses a different LACP system priority

Answer

The ESXi hosts have different LAG IDs

Answer

The VDS LAG hashing algorithm is set to IP hash

Question 9

A company deploys a VDS with multiple uplinks and uses Route based on originating virtual port for load balancing. The network team reports that traffic from VMs on the same host is not balanced across uplinks. The administrator verifies that the physical switch ports are all in the same port-channel. What could be the cause?

Accepted Answer

The uplinks are configured in active/standby mode. When uplinks are configured in active/standby mode, only one uplink is active at a time, so no load balancing occurs regardless of the algorithm. Option B is incorrect because Route based on originating virtual port is a vSphere algorithm and does not depend on physical switch support. Option C is incorrect because having fewer VMs than uplinks might reduce distribution but does not prevent load balancing entirely; traffic could still be balanced across active uplinks. Option D is incorrect because an explicit failover order can still allow multiple active uplinks if multiple paths are set to active; it is not the same as active/standby.

Answer

The load balancing algorithm is not supported by the physical switch

Answer

The number of VMs is less than the number of uplinks

Answer

The teaming policy uses an explicit failover order

Question 10

An administrator needs to create a distributed port group on a vSphere Distributed Switch (VDS). Which two configuration settings must be specified during creation? (Choose two.)

Accepted Answer

VLAN ID. A VLAN ID must be specified to define the VLAN membership for the distributed port group, ensuring proper network segmentation and traffic isolation. The port group name is required as a unique identifier for administrative management and reference within the vSphere environment.

Answer

Uplink teaming policy

Answer

Number of ports

Answer

Traffic shaping policy

Question 11

A virtual machine connected to the 'VM Network' port group is unable to obtain an IP address from the DHCP server located on the same subnet (192.168.1.0/24). The DHCP server is connected to the physical switch which is configured as an access port for VLAN 100. What is the most likely cause of the issue?

Accepted Answer

The port group should use a different VLAN ID.. The virtual machine is connected to the default 'VM Network' port group, which has VLAN ID 0 (no VLAN tagging), sending untagged traffic. The DHCP server is connected to a physical switch port configured as an access port for VLAN 100, placing it in VLAN 100. Because the VM and the DHCP server are on different VLANs, they cannot communicate at Layer 2, preventing DHCP discovery broadcasts from reaching the server. The most likely cause is that the port group should use a different VLAN ID (VLAN 100) to match the DHCP server's VLAN. Changing the port group to VLAN 100 will tag the traffic, requiring a trunk on the physical uplink, but the root cause is the VLAN mismatch, not solely the uplink configuration.

Answer

The physical uplink vmnic0 is not configured as a trunk on the physical switch.

Answer

The standard switch has MTU of 1500 but DHCP uses 1500.

Answer

The DHCP server is on a different VLAN.

Answer

The VMkernel port vmk0 has an IP address in the same subnet but is not required for DHCP.

Question 12

Refer to the exhibit. An administrator notices that the ESXi host is listening on both IPv4 and IPv6 for HTTPS. However, IPv6 traffic is not being forwarded to the host. Which configuration change is most likely needed?

Accepted Answer

Configure a default gateway for the IPv6 stack on the host.

Answer

Disable IPv6 and use only IPv4.

Answer

Remove the IPv4 HTTPS listener to force IPv6.

Answer

Enable IPv6 on the vSphere Distributed Switch.

Question 13

Refer to the exhibit. A virtual machine on the VM Network is experiencing intermittent connectivity. The administrator notices that vmnic0 is saturated. Which action would improve performance without causing a single point of failure?

Accepted Answer

Configure load-based teaming on vSwitch0 for the VM Network portgroup.

Answer

Change the active uplinks for VM Network to vmnic1 only.

Answer

Increase the MTU on vSwitch0 to 9000.

Answer

Move the VM Network to vSwitch1.

Question 14

Refer to the exhibit. The ESXi host has three VMkernel interfaces. A vMotion operation fails with a routing error. Which is the most likely cause?

Accepted Answer

The vMotion VMkernel interface is on vmk2, but no route exists for the vMotion destination network.

Answer

The vMotion VMkernel interface uses DHCP.

Answer

The vMotion VMkernel interface is on vmk1, but the default gateway points to vmk0.

Answer

The vMotion VMkernel interface is on vmk0, but the gateway is incorrect.

Question 15

Refer to the exhibit. An administrator cannot resolve the hostname of a DNS server using the ESXi host. What is the most likely cause?

Accepted Answer

The DNS servers are not configured correctly for the domain.

Answer

The search domain is incorrectly set to localdomain.

Answer

The DNS servers are unreachable.

Answer

The ESXi host is not configured to use DNS.