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

Question 1

An administrator is configuring a vSphere distributed switch. Which TWO are valid uplink teaming policies? (Choose two.)

Accepted Answer

Route based on physical NIC load. Route based on physical NIC load (option D) is a valid uplink teaming policy in vSphere distributed switches. This policy uses the load metric from the physical NICs to distribute traffic, where the switch selects the uplink with the least current load for outbound traffic, as determined by the vSphere Distributed Switch's load balancing algorithm.

Answer

Explicit failover order

Answer

Route based on MAC hash

Answer

Route based on round robin

Question 2

A company runs a three-tier application on vSphere 7.0. The web tier uses VLAN 100, app tier VLAN 200, and database tier VLAN 300. Each tier is on a separate port group on a vSphere distributed switch. The environment uses Network I/O Control (NIOC) with shares set to: Web (50), App (30), Database (20). The physical uplinks are two 10 GbE NICs in a team. Recently, the database team reports slow performance during peak hours. The network team checks the physical switches and finds no congestion. The ESXi host shows the two uplinks are heavily utilized with many dropped packets on the database port group. The administrator suspects that the database traffic is being starved by other traffic. Which action should the administrator take to resolve the issue?

A. Increase the number of physical uplinks to four 10 GbE NICs.
B. Change the NIOC shares to Web (10), App (30), Database (60).
C. Create a separate vSphere standard switch for the database tier.
D. Enable SR-IOV on the physical NICs and assign virtual functions to database VMs.

Accepted Answer

Change the NIOC shares to Web (10), App (30), Database (60).. The database traffic is being starved due to low NIOC shares relative to the web and app tiers. By increasing the database shares to 60 and reducing web to 10, the database port group will receive a higher proportion of the available bandwidth during congestion, alleviating the dropped packets and slow performance. NIOC shares are relative and only take effect when there is contention, so adjusting them directly addresses the starvation without requiring additional hardware.

Answer

Create a separate vSphere standard switch for the database tier.

Answer

Enable SR-IOV on the physical NICs and assign virtual functions to database VMs.

Answer

Increase the number of physical uplinks to four 10 GbE NICs.

Question 3

Order the steps to perform a vMotion migration of a powered-on virtual machine.

Accepted Answer

Verify prerequisites, Initiate migration, Select migration type, Choose destination, Confirm settings. Prerequisites check, initiate migration, select type, choose destination, and confirm.

Answer

Select migration type, Verify prerequisites, Initiate migration, Choose destination, Confirm settings

Answer

Initiate migration, Choose destination, Select migration type, Verify prerequisites, Confirm settings

Answer

Confirm settings, Initiate migration, Verify prerequisites, Choose destination, Select migration type

Question 4

Order the steps to enable vSphere HA on a cluster.

Accepted Answer

Step 1: Select the cluster, Step 2: Access HA settings, Step 3: Enable vSphere HA, Step 4: Configure HA options, Step 5: Confirm changes. The correct sequence for enabling vSphere HA ensures that all prerequisites are met, starting with cluster selection, then accessing the HA configuration page, toggling the enable option, customizing settings, and applying changes. Common mistakes include attempting to configure options before enabling HA or accessing settings before selecting the cluster.

Answer

Step 1: Select the cluster, Step 2: Enable vSphere HA, Step 3: Access HA settings, Step 4: Configure HA options, Step 5: Confirm changes

Answer

Step 1: Access HA settings, Step 2: Select the cluster, Step 3: Enable vSphere HA, Step 4: Configure HA options, Step 5: Confirm changes

Answer

Step 1: Select the cluster, Step 2: Configure HA options, Step 3: Access HA settings, Step 4: Enable vSphere HA, Step 5: Confirm changes

Question 5

Match each vSphere feature to its correct description.

Accepted Answer

vMotion: Enables live migration of running virtual machines with zero downtime. Key vSphere features: vMotion (live migration), HA (automatic restart), DRS (load balancing), FT (continuous availability via lockstep). Common confusions involve swapping the feature and its description.

Answer

vMotion: Provides automatic restart of VMs after host failure

Answer

HA: Enables live migration of running VMs

Question 6

A network administrator notices that all traffic from two VMs connected to the same standard switch port group is going through the same physical uplink, causing congestion. The teaming policy is set to Route based on originating virtual port. What change should the administrator make to distribute traffic more evenly?

Accepted Answer

Change teaming policy to Route based on IP hash.. IP hash uses source and destination IP addresses to distribute traffic across uplinks, providing better load distribution. Option B is incorrect because simply adding more uplinks without changing the teaming policy does not redistribute traffic; the originating virtual port still ties the VM to a single uplink. Option C is incorrect because LACP is not supported on standard vSwitches; it requires a distributed switch. Option D is incorrect because explicit failover order does not distribute traffic; it only defines active/standby uplinks.

Answer

Increase the number of uplinks to 4.

Answer

Enable LACP on the standard switch.

Answer

Change the load balancing policy to Explicit failover order.

Question 7

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.. Best practice for segmenting different traffic types (production, management, vMotion) on a distributed switch is to create separate distributed port groups, each assigned a unique VLAN ID. This isolates traffic at Layer 2, enhances security, and prevents interference. VMkernel adapters for management and vMotion, as well as VMs for production, are then attached to their respective port groups. Option B is incorrect because VLAN tagging on VMs is not suitable for VMkernel adapters, which require dedicated port groups. Option C is incorrect because using standard switches defeats the purpose of a distributed switch and adds management complexity. Option D is incorrect because VLAN trunk (4095) is used for guest-level tagging, not for isolating kernel traffic. Option E is incorrect because management and vMotion should be on separate VLANs to avoid resource contention and security risks.

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 8

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.. 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 9

A VM cannot connect to the network after being migrated to a different host in the cluster. The VM's network adapter is connected to a standard switch port group that exists on the source host but not on the destination host. What is the most likely cause?

Accepted Answer

The standard switch is not configured on the destination host.. Standard switches are host-specific, so the port group must exist on each host where VMs using it are placed. If the destination host does not have the same standard switch and port group configured, the VM loses connectivity. Option B is incorrect because MAC address restrictions are not a typical cause. Option C is irrelevant because the VLAN ID is part of the port group definition, but the issue here is the port group's absence. Option D is unrelated to standard switch configuration.

Answer

The VM's MAC address is not allowed on the destination port group.

Answer

The VLAN ID on the port group does not match.

Answer

The ESXi host's firewall is blocking the VM's traffic.

Question 10

An administrator configures a distributed switch with a single uplink on each host and a port group with VLAN 10. After connecting a VM to the port group, the VM cannot communicate with other VMs on the same VLAN but on different hosts. What is a likely cause?

Accepted Answer

The physical switch port is set to access mode with VLAN 10.. When the physical switch port is in access mode with VLAN 10, it expects untagged frames. However, the distributed port group with VLAN 10 tags the frames with VLAN 10. This mismatch causes the physical switch to drop or mishandle the traffic, preventing the VM from communicating with other VMs on the same VLAN across hosts. Option B is incorrect because teaming is not required for basic connectivity; a single uplink suffices. Option C describes trunk mode which would actually accept tagged frames, so it would work. Option D is incorrect because the VLAN ID is configured on the port group, not on the VM's virtual adapter.

Answer

The distributed switch has no teaming configured.

Answer

The physical switch port connected to the uplink is set to trunk mode and is tagging the VLAN.

Answer

The VLAN ID is not set correctly on the VM's virtual network adapter.

Question 11

An ESXi host has two physical uplinks (vmnic0, vmnic1) connected to a distributed switch. The administrator wants to use LACP to aggregate these uplinks to a physical switch stack. Which prerequisite must be met for LACP to work with a distributed switch?

Accepted Answer

The distributed switch must be configured with a LAG and the physical switch with matching LACP settings.. For LACP to work with a distributed switch, the distributed switch must be configured with a Link Aggregation Group (LAG) and the physical switch must be configured with matching LACP settings. Option A is incorrect because LACP requires a dynamic LAG on the physical switch, not static. Option B is incorrect because LACP support for distributed switches was introduced in vSphere 5.1, not 5.5. Option C is incorrect because LACP requires active/active configuration, not active/standby. Option E is not a prerequisite; LACP uses the physical MAC addresses of the uplinks.

Answer

The physical switch must be configured with a static LAG.

Answer

The distributed switch version must be 5.5 or later.

Answer

The uplinks must be in an active/standby configuration.

Answer

The LACP group must have a unique MAC address.

Question 12

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. Private VLANs enable isolation between VMs within the same VLAN by dividing the VLAN into primary, isolated, and community sub-VLANs. Option A (Network I/O Control) is used for bandwidth allocation and does not provide traffic isolation. Option C (VLAN trunking) allows multiple VLANs over a single link, not isolation within a VLAN. Option D (Traffic shaping) controls rate limiting, not isolation. Option E (Port binding) determines port membership on a distributed switch, but does not isolate traffic within a VLAN.

Answer

Network I/O Control

Answer

VLAN trunking

Answer

Traffic shaping

Answer

Port binding

Question 13

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.. In a Private VLAN configuration, isolated secondary VLANs can only communicate with promiscuous ports on the primary VLAN. A VM deployed on the primary VLAN with routing capabilities acts as a promiscuous port and can forward traffic between the isolated (101) and community (102) secondary VLANs. Option A is incorrect because enabling promiscuous mode on the isolated port group does not allow communication to community VLANs and breaks isolation. Option B is not the standard VMware recommended approach; the typical method is to use a VM on the primary VLAN. Option C is incorrect because communication is possible through a promiscuous port on the primary VLAN.

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 14

Which two conditions must be met for a VMkernel adapter to be used for vMotion on a distributed switch? (Choose two.)

Accepted Answer

The VMkernel adapter must be in the same subnet as the destination host.. Options A and B are correct. The VMkernel adapter must be in the same subnet as the destination host (A) to allow vMotion traffic to route properly, and it must be enabled for vMotion (B) in the adapter properties. Other options are not required: active/standby mode (C) is not a requirement; VLAN ID can be any valid VLAN (D); and static IP is not necessary (E) as DHCP can be used.

Answer

The physical uplinks must be in active/standby mode.

Answer

The port group must have VLAN ID 0.

Answer

The port group must be configured with a static IP address.

Question 15

Which three factors influence the behavior of Network I/O Control (NIOC) when allocating bandwidth to different traffic types? (Choose three.)

Accepted Answer

Reservation per traffic type. Options B, C, and D are correct. Network I/O Control (NIOC) uses three configurable parameters to allocate bandwidth per traffic type: reservation (guaranteed bandwidth), shares (relative priority), and limit (maximum bandwidth). Total physical bandwidth (A) and the number of physical uplinks (E) affect overall capacity but are not configurable per traffic type, and do not directly influence NIOC's bandwidth allocation behavior.

Answer

The total physical bandwidth

Answer

The number of physical uplinks