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

Question 1

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). Option D is correct because 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 2

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. Option C is correct because the first step is to verify the physical switch port configuration for the failed uplink, as it may be misconfigured, disabled, or have a faulty cable. Option A would be premature without knowing the root cause. Option B might help if failover is needed but does not address the root cause. Option D adjusts load balancing but does not fix the down uplink.

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 3

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 A and B. Adding the ESXi hosts to the distributed switch (A) is necessary for them to use the switch. Creating a port group and assigning a VLAN ID (B) provides the network layer connectivity. Option C (setting MTU to 9000) is optional and not required for basic connectivity. Option D (configuring a VMkernel interface) is for host management, not VM connectivity. Option E (enabling NIOC) is optional for QoS.

Answer

Configure a VMkernel interface on the distributed switch

Answer

Set the MTU to 9000

Answer

Enable Network I/O Control

Question 4

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

Accepted Answer

Management traffic. The correct answers are A, C, and D. vMotion (A), management (C), and vSAN (D) are all types of traffic that use VMkernel adapters and can be assigned to separate adapters for performance or security. Fault Tolerance logging (B) also uses VMkernel but is not as commonly separated; however, the question asks for exactly three, and B is a distractor. Virtual machine network traffic (E) uses port groups, not VMkernel adapters.

Answer

Virtual machine network traffic

Answer

Fault Tolerance logging

Question 5

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. Option C is correct because 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 (change VLAN to 0) would break connectivity. Option B (enable VLAN tagging) is unnecessary as the port group already tags VLAN 100. Option D (add second NIC) 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 6

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. Option B is correct because NIOC requires that each traffic type be assigned to a network resource pool; if the vMotion VMkernel adapter is not assigned to the vMotion resource pool, NIOC does not apply. Option A (NIOC not enabled) would prevent any NIOC functionality, but the administrator configured NIOC, so it is likely enabled. Option C (oversubscribed uplinks) could affect performance but does not explain why NIOC prioritization is ineffective. Option D (CoS marking) is unrelated to NIOC shares.

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 7

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. Option A is correct because even if LACP modes match, the physical switch ports must be grouped into a port-channel or etherchannel before LACP can establish. Option B (hashing algorithm) does not prevent LACP from forming. Option C (different LAG IDs) would be incorrect if the LAG is configured identically on all hosts. Option D (system priority) might influence which side is responsible for deciding aggregation, but does not prevent the LAG from coming up if otherwise correct.

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 8

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. Option D is correct because if the uplinks are configured as active/standby, only one uplink is active at a time, so no load balancing occurs regardless of the algorithm. Option A (algorithm not supported) is irrelevant as this is a vSphere algorithm. Option B (few VMs) might reduce distribution but not eliminate it entirely. Option C (explicit failover order) still allows multiple active uplinks if configured with multiple active paths.

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 9

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 10

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 physical uplink vmnic0 is not configured as a trunk on the physical switch.. The DHCP server is connected to a physical switch port configured as an access port for VLAN 100, meaning it expects untagged traffic on VLAN 100. However, the virtual machine is connected to the 'VM Network' port group, which by default is untagged (VLAN ID 0). For the VM's DHCP request to reach the server, the physical uplink (vmnic0) must be configured as a trunk port on the physical switch to carry the VLAN 100 traffic; otherwise, the switch will drop or misdirect the frames, preventing DHCP from working.

Answer

The port group should use a different VLAN ID.

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 11

A company runs a vSphere 7 cluster with 4 ESXi hosts, each connected to a single vSphere Distributed Switch (VDS) with two 10GbE uplinks. The environment hosts 100 production VMs and uses vSphere Replication for disaster recovery to a remote site. Network I/O Control (NIOC) is enabled on the VDS with the following shares: vSphere Replication (System Traffic) = 100, Virtual Machine Traffic = 50. During the scheduled replication window (every 2 hours), users report significant VM performance degradation. The administrator observes that during replication, the VMkernel interfaces handling replication consume 95% of the available uplink bandwidth. The goal is to guarantee at least 6 Gbps of bandwidth for VM traffic on each host while still allowing replication to occur. Which action should the administrator take?

Accepted Answer

Create a network resource pool for VM traffic on the VDS and assign a reservation of 6 Gbps.. Creating a network resource pool for VM traffic and assigning a reservation of 6 Gbps guarantees that VM traffic gets at least that amount of bandwidth, regardless of replication demands. This is the proper use of NIOC resource pools. Option B (increasing shares) only affects priority, not guarantees. Option C (limiting replication) could help but does not guarantee VM bandwidth and may still allow replication to burst if the limit is not set appropriately. Option D (adding uplinks) is expensive and may not directly address the guarantee requirement.

Answer

Increase the shares for Virtual Machine traffic to 200.

Answer

Increase the number of uplinks to four per host.

Answer

Set a hard limit of 4 Gbps on vSphere Replication traffic.

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.