VCP-DCV Practice Test 22 — 15 Questions

Question 1

An administrator is configuring a distributed switch for a cluster of ESXi hosts. The requirements are: VLAN 100 for production, VLAN 200 for management, and a separate VLAN 300 for vMotion. The management network should be isolated from production traffic. What is the best practice for configuring these networks on the distributed switch?

Accepted Answer

Create three separate distributed port groups, each with the appropriate VLAN ID, and assign each VM kernel adapter or VM to the correct port group.. Option B is correct because best practice is to create separate port groups for each traffic type with specific VLAN IDs. Option A is wrong because VLAN tagging on VMs is not intended for management/vMotion kernel adapters. Option C is wrong because VLAN trunk (4095) is for guest-level tagging. Option D is wrong because vMotion should have its own VLAN. Option E is wrong because distributed switch can handle all.

Answer

Create one distributed port group with VLAN 100, and use VLAN tagging on the VMs for management and vMotion.

Answer

Use standard switches for management and vMotion to avoid complexity.

Answer

Create one distributed port group with VLAN trunk (4095) and use port-based VLAN filtering on the VMs.

Answer

Create two port groups: one for production (VLAN 100) and one for management+vMotion (VLAN 200) because vMotion can share VLAN with management.

Question 2

An organization is using Network I/O Control (NIOC) on a distributed switch to manage bandwidth for different traffic types. The current configuration assigns 50 shares to management traffic, 50 shares to vMotion traffic, and 100 shares to NFS storage traffic. During peak hours, management traffic is suffering from high latency. The administrator must prioritize management traffic over all others while still ensuring minimum bandwidth for storage. Which action would best address the issue?

Accepted Answer

Set a reservation of 1 Gbps for management traffic and keep shares as they are.. Option B is correct because setting a reservation for management traffic guarantees a minimum bandwidth, ensuring it is not starved. Option A increases shares but does not guarantee minimum bandwidth. Option C is wrong because limit would cap traffic, making it worse. Option D still lacks guarantee. Option E is not a feature of NIOC.

Answer

Increase the shares for management traffic to 200 and reduce vMotion to 25.

Answer

Reduce NFS shares to 50 and increase management shares to 100.

Answer

Enable the 'Limit' setting on management traffic to cap it.

Answer

Create a network resource pool for management traffic with a guaranteed share value.

Question 3

A network administrator needs to isolate traffic between VMs in the same VLAN on a distributed switch. Which feature should be used?

Accepted Answer

Private VLAN. Option B is correct because Private VLANs allow isolation within a VLAN. Option A is for trunking. Option C is for bandwidth allocation. Option D is for rate limiting. Option E is for port binding.

Answer

Network I/O Control

Answer

VLAN trunking

Answer

Traffic shaping

Answer

Port binding

Question 4

A VM experiences high packet loss during peak hours. The VM is connected to a distributed switch port group with a traffic shaping policy: average bandwidth 100 Mbps, peak bandwidth 200 Mbps, burst size 50 KB. What is the most likely cause?

Accepted Answer

The burst size is too small, causing packets to be dropped when burst traffic exceeds the average.. Option B is correct because a small burst size causes packets to be dropped when short bursts exceed the average. Option A is less likely since peak is 200 Mbps. Option C would not cause packet loss if disabled. Option D is unlikely if the uplink is faster.

Answer

The peak bandwidth limit is being exceeded.

Answer

The traffic shaping policy is disabled.

Answer

The physical uplink speed is less than 200 Mbps.

Question 5

An administrator configures a Private VLAN on a distributed switch with primary VLAN 100 and secondary VLANs 101 (isolated) and 102 (community). A VM on isolated secondary VLAN 101 needs to communicate with a VM on community secondary VLAN 102. What additional configuration is required?

Accepted Answer

Deploy a VM on the primary VLAN 100 with routing capabilities to forward traffic between the secondary VLANs.. Option C is correct because isolated PVLANs can only communicate with promiscuous ports (on the primary VLAN). A VM on the primary VLAN can act as a gateway. Option A is not enough; promiscuous mode on the secondary port group would break isolation. Option B might be possible but not standard. Option D is incorrect because they can communicate through a promiscuous port.

Answer

Enable promiscuous mode on the port group for VLAN 101.

Answer

Configure a proxy router on the physical network.

Answer

They cannot communicate because isolated PVLANs prohibit any communication to other secondary VLANs.

Question 6

An administrator is configuring a distributed switch with LACP. Which two statements are true regarding LACP support on vSphere distributed switches? (Choose two.)

Accepted Answer

LACP supports both active and passive modes.. Options B and C are correct. LACP requires a LAG to be created on the DVS (B) and supports both active and passive modes (C). Option A is false (standard vSwitches do not support LACP). Option D is false (LACP can be used for all traffic types). Option E is false (load balancing is determined by the LAG policy, not automatically IP hash).

Answer

LACP automatically distributes traffic based on IP hash.

Answer

LACP can be configured on standard vSwitches.

Answer

LACP is only supported for virtual machine traffic, not for management or vMotion.

Question 7

An administrator sees this health check output. What should be done to verify VLAN 100 connectivity?

Accepted Answer

Create a VMkernel adapter on VLAN 100 and ping a gateway.. Option A is correct because to test VLAN 100, a VMkernel adapter with that VLAN should be created and used to ping a gateway. Option B is for pruning, not testing. Option C would test VM traffic, but VMkernel adapter is more direct for verification. Option D is not necessary.

Answer

Enable VLAN pruning on the physical switch.

Answer

Configure a port group for VLAN 100 and connect a VM.

Answer

Restart the management agents.

Question 8

The administrator configured this LAG on a distributed switch and corresponding LACP settings on the physical switch. But the LAG is not coming up. What is a likely issue?

Accepted Answer

The LAG mode is passive, but the physical switch is also configured as passive.. Option A is correct because if the LAG mode is passive and the physical switch is also configured as passive, LACP negotiation fails. Option B is not the issue as the load balancing policy is valid. Option C is irrelevant. Option D is not required.

Answer

The load balancing policy should be IP hash.

Answer

The LAG name is not used by the physical switch.

Answer

The uplinks should be in active/active mode.

Question 9

During a period of high network contention, management traffic is starved while NFS traffic gets the most bandwidth. Which configuration change would best address the issue?

Accepted Answer

Set a reservation for management traffic.. Option B is correct because setting a reservation for management traffic guarantees a minimum bandwidth. Option A increases shares but does not guarantee. Option C configures shaping on the port group, not NIOC. Option D increases the NFS limit, which does not help management. Option E removes vMotion reservation, which may free bandwidth but does not guarantee management.

Answer

Increase management shares to 100.

Answer

Increase the NFS limit to 1000 Mbps.

Answer

Enable traffic shaping on the management port group.

Answer

Remove the reservation from vMotion.

Question 10

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?

Accepted Answer

Port group name 'Production'. Option A is correct because 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 11

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.. Options A and B are correct. First, NIOC must be enabled on the DVS. Then a network resource pool must be created for vSphere Replication traffic. Option C is incorrect because assigning the VMkernel adapter to the resource pool is a subsequent step, not one of the two required actions (it is required but the question asks for two). Option D is incorrect because traffic shaping is not used with NIOC. Option E is incorrect because a separate VLAN is not required for NIOC.

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 12

An administrator configures a VDS with two uplinks and sets the load balancing policy to 'Route based on IP hash'. What additional configuration is required on the physical switches to ensure proper traffic distribution?

Accepted Answer

Configure a static EtherChannel.. Option B is correct because IP hash load balancing requires a static EtherChannel on the physical switches to aggregate the two links. Option A is incorrect because LACP is a different protocol. Option C is incorrect because individual ports would cause misconfiguration. Option D is incorrect because port security is not related.

Answer

Use individual ports with no aggregation.

Answer

Set port security to allow multiple MAC addresses.

Answer

Enable Link Aggregation Control Protocol (LACP).

Question 13

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.. Option B is correct because the virtual machine's operating system MTU must be set to 9000 to use jumbo frames; otherwise, the OS will fragment packets. Option A is incorrect because VMkernel adapters do not affect VM data traffic. Option C is incorrect because physical NICs are already configured. Option D is incorrect because TCP offload would not cause this.

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 14

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.. Option D is correct because for a successful LACP negotiation, the port key, mode (active/passive), and rate (slow/fast) must be consistent on both ends. Option A alone is insufficient. Option B alone is insufficient. Option C alone is insufficient.

Answer

LACP mode (active/passive).

Answer

LACP rate (slow/fast).

Answer

LACP port key.

Question 15

An administrator needs to separate vMotion traffic from management traffic. Which should be created?

Accepted Answer

A new VMkernel adapter on a different subnet.. Option B is correct because creating a separate VMkernel adapter on a different subnet for vMotion is a best practice to isolate traffic. Option A is incorrect because a new standard switch port group alone does not separate traffic without a different IP network. Option C is incorrect because using the same VLAN but different IP subnet still shares the same broadcast domain. Option D is incorrect because a new physical NIC is often not necessary; a VLAN can suffice.

Answer

A new physical NIC.

Answer

A new VLAN on the existing port group.

Answer

A new standard switch port group.