VCP-DCV Configure and Manage vSphere Networking Practice Test 3 — 15 Questions

Question 1

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 A and D are correct. LACP supports both active and passive modes (A). A LAG must be created on the distributed switch for LACP (D). Option B is false because LACP does not automatically distribute traffic based on IP hash; the load balancing algorithm is configured on the LAG. Option C is false because LACP is only supported on distributed switches, not standard vSwitches. Option E is false because LACP can be used for all traffic types, including management and vMotion.

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 2

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.. 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 3

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.. When both the vSphere distributed switch LAG and the physical switch are configured in passive mode, LACP negotiation fails because neither side initiates the negotiation. One side must be set to active for LACP to establish. Option A is incorrect because the load balancing policy (e.g., IP hash) is separate from LACP mode; it controls traffic distribution, not LACP negotiation. Option B is incorrect because the LAG name is not used by LACP; LACP uses system identifiers and port keys, so a name mismatch does not prevent the LAG from coming up. Option D is incorrect because active/active mode refers to the uplink teaming policy, not the LACP mode setting.

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 4

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.. Setting a reservation for management traffic guarantees a minimum amount of bandwidth, ensuring that management traffic does not get starved even under high network contention. Option A (increasing management shares) improves relative priority but does not guarantee bandwidth. Option B (increasing the NFS limit) would allocate more bandwidth to NFS, worsening the problem. Option D (enabling traffic shaping on the management port group) affects only outbound traffic on a standard switch and does not use NIOC (Network I/O Control), which is needed for reservation-based guarantees. Option E (removing the vMotion reservation) may free up bandwidth but does not guarantee management traffic receives a minimum.

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 5

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'. 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 6

An administrator has configured a vSphere Distributed Switch (VDS) with Network I/O Control. They need to guarantee bandwidth for a specific set of virtual machines. Which method should be used?

Accepted Answer

Create a port group with a custom network resource pool.. Create a port group with a custom network resource pool. Network I/O Control allows administrators to create network resource pools to guarantee bandwidth for specific virtual machines or port groups. By creating a custom network resource pool and assigning it to a port group, you can reserve a certain amount of bandwidth. Option B is incorrect because SR-IOV provides direct hardware passthrough but does not manage bandwidth guarantees; it can actually bypass Network I/O Control. Option C is incorrect because setting a VLAN tag does not guarantee bandwidth; it only separates traffic. Option D is incorrect because traffic shaping is used to limit bandwidth (throttle outgoing traffic) but does not guarantee a minimum bandwidth; it only caps it.

Answer

Enable SR-IOV on the physical NICs.

Answer

Set the virtual machine's network adapter to use a specific VLAN.

Answer

Configure Traffic Shaping on the distributed switch.

Question 7

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.. Jumbo frames must be enabled on the physical NICs (vmnic) as well as the virtual switch. If the physical NICs are still set to MTU 1500, frames larger than 1500 bytes will be dropped when they reach the physical switch port, preventing inter-host communication while intra-host communication remains unaffected. Option A is incorrect because QoS configuration does not relate to MTU issues. Option B is incorrect because VMkernel adapters are used for management and vMotion traffic, not VM data traffic. Option C is incorrect because the distributed switch port group MTU is inherited from the DVS, which already has MTU 9000.

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 8

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. For basic network connectivity of virtual machines on a vSphere Standard Switch, a port group must be created. Two essential settings are the port group name (to identify the network) and a VLAN ID (to associate the VMs with the correct VLAN; VLAN 0 is the default untagged VLAN). Without a name, the port group cannot be created; without a VLAN ID, VMs may not be properly segmented or may lack network access. Other options like MTU, network adapter type, and security policy are not essential for basic connectivity.

Answer

MTU

Answer

Network adapter type (e.g., E1000)

Answer

Security policy

Question 9

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. Options B, C, and E are correct. The physical NIC uplink provides connectivity from the host, the distributed switch uplink port group connects the DVS to the physical NIC, and the physical switch port must be configured to allow traffic. Option A is incorrect because the VM's IP address is an OS setting, not a vSphere networking component. Option D is incorrect because the VM's network adapter driver is a software component, not a configuration element.

Answer

VM's IP address

Answer

VM's network adapter driver

Question 10

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 the two actions required to implement NIOC for vSphere Replication. NIOC must first be enabled on the distributed switch (A), then a network resource pool must be created for the replication traffic (B). Option C is incorrect because traffic shaping is a separate rate-limiting mechanism and is not used with NIOC; NIOC relies on resource pools for guaranteed bandwidth. Option D is incorrect because a separate VLAN provides network segmentation but does not guarantee bandwidth; NIOC is needed for that. Option E is incorrect because assigning the VMkernel adapter to the resource pool is a subsequent step that is necessary but not one of the two primary actions asked for in the question.

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 11

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.. IP hash load balancing requires a static EtherChannel on the physical switches to aggregate the two links. Option A is incorrect because using individual ports without aggregation would not properly distribute traffic based on IP hash. Option B is incorrect because port security settings are not related to load balancing. Option C is incorrect because LACP is not required; IP hash works with a static EtherChannel.

Answer

Use individual ports with no aggregation.

Answer

Set port security to allow multiple MAC addresses.

Answer

Enable Link Aggregation Control Protocol (LACP).

Question 12

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 the entire network path, including the virtual machine's operating system, to support the larger MTU. If the VM OS MTU is left at 1500, packets larger than 1500 bytes will be fragmented by the OS or dropped, preventing large file transfers. Option A is incorrect because the problem states physical switches and the VDS are configured for jumbo frames, but the physical NICs must also be configured; however, the question does not indicate they are misconfigured, and the issue is more likely the VM OS. Option B is incorrect because TCP offload engines typically handle segmentation and checksum, not fragmentation due to MTU mismatch. Option C is incorrect because VMkernel adapters are for management and vMotion traffic, not VM data traffic; VM data uses the VM's own network stack.

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 13

An administrator has created a standard vSwitch port group with VLAN ID 100. Virtual machines in this port group can communicate with each other but not with devices on the physical network. What is a possible cause?

Accepted Answer

The physical switch port is not configured to pass VLAN 100.. The issue is that VMs on VLAN 100 can communicate among themselves but not with the physical network. This indicates that VLAN tagging is working within the vSwitch (inter-VM communication works), but the physical switch port is not configured to pass VLAN 100 traffic. The uplink from the ESXi host to the physical switch must be set as a trunk port allowing VLAN 100, or if using an access port, it must be set to VLAN 100. Option A (only one uplink) is sufficient for connectivity. Option B (duplicate MAC addresses) would cause issues even locally. Option D (different subnets) would also affect local communication, but local communication works, so these are not the cause.

Answer

The vSwitch has only one uplink.

Answer

The virtual machines have duplicate MAC addresses.

Answer

The virtual machines are using different subnets.

Question 14

An administrator needs to capture traffic from a specific virtual machine for troubleshooting. Which vSphere networking feature should be used?

Accepted Answer

Port mirroring on the VDS.. Port mirroring on a VDS (option A) is the correct feature for capturing traffic from a specific virtual machine. It copies all packets from a source port (the VM's port) to a destination port for analysis. Option B (LLDP) is used for discovering network neighbors, not packet capture. Option C (NetFlow) provides flow statistics and metadata but not full packet capture. Option D (traffic shaping) controls bandwidth, not capture.

Answer

LLDP on the VDS.

Answer

NetFlow on the VDS.

Answer

Traffic shaping on the VDS.

Question 15

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 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.