VMware 2V0-621 Online Practice Questions and Exam Preparation

VMware 2V0-621 Online Questions & Answers

• Question 231:

  An ESXi 6.x host in the vCenter Server inventory has disconnected due to an All Paths Down (APD) situation. An administrator has corrected the APD issue on the host, but it still remains disconnected. What action should the administrator take next?

  A. Select Restart Management Agents from the DCUI.
  B. Execute esxcli system settings advanced set -d /Scsi/FailVMIOonAPD.
  C. Modify the advanced parameter /Disk/ApdTokenRetryCount.
  D. Enable the advanced parameter /Misc/APDHandlingEnable.
  A. Select Restart Management Agents from the DCUI.

  ---

  All-Paths-Down (APD)

  1.

  A datastore is shown as unavailable in the Storage view

  2.

  A storage adapter indicates the Operational State of the device as Dead or Error

  3.

  All paths to the device are marked as Dead

  4.

  You are unable to connect directly to the ESXi host using the vSphere Client

  5.

  The ESXi host shows as Disconnected in vCenter Server

  6.

  In the /var/log/vmkernel.log file, you see entries similar to:

  cpu1:2049)WARNING: NMP: nmp_IssueCommandToDevice:2954:I/O could not be issued to device "naa.60a98000572d54724a34642d71325763" due to Not found cpu1:2049)WARNING: NMP: nmp_DeviceRetryCommand:133:Device

  "naa.60a98000572d54724a34642d71325763": awaiting fast path state update for failover with I/O blocked. No prior reservation exists on the device. cpu1:2049)WARNING: NMP: nmp_DeviceStartLoop:721:NMP Device

  "naa.60a98000572d54724a34642d71325763" is blocked. Not starting I/O from device. cpu1:2642)WARNING: NMP: nmpDeviceAttemptFailover:599:Retry world failover device "naa.60a98000572d54724a34642d71325763" - issuing

  command 0x4124007ba7c0 cpu1:2642)WARNING: NMP: nmpDeviceAttemptFailover:658:Retry world failover device "naa.60a98000572d54724a34642d71325763" - failed to issue command due to Not found (APD), try again... cpu1:2642)

  WARNING: NMP: nmpDeviceAttemptFailover:708:Logical device "naa.60a98000572d54724a34642d71325763": awaiting fast path state update... cpu0:2642)WARNING: NMP: nmpDeviceAttemptFailover:599:Retry world failover device

  "naa.60a98000572d54724a34642d71325763" - issuing command 0x4124007ba7c0 cpu0:2642)WARNING: NMP: nmpDeviceAttemptFailover:658:Retry world failover device "naa.60a98000572d54724a34642d71325763" - failed to issue

  command due to Not found (APD), try again... cpu0:2642)WARNING: NMP: nmpDeviceAttemptFailover:708:Logical device "naa.60a98000572d54724a34642d71325763": awaiting fast path state update...

  A restart of the management agents may show these errors:

  Not all VMFS volumes were updated; the error encountered was 'No connection'.

  Errors:

  Rescan complete, however some dead paths were not removed because they were in use by the system. Please use the 'storage core device world list' command to see the VMkernel worlds still using these paths. Error while scanning

  interfaces, unable to continue. Error was Not all VMFS volumes were updated; the error encountered was 'No connection'.

  You may also see that the device is no longer listed:

  cpu17:10107)WARNING: Vol3: 1717: Failed to refresh FS 4beb089b-68037158-2ecc-00215eda1af6 descriptor: Device is permanently unavailable cpu17:10107)ScsiDeviceIO: 2316: Cmd(0x412442939bc0) 0x28, CmdSN 0x367bb6 from

  world 10107 to dev "eui.00173800084f0005" failed H:0x1 D:0x0 P:0x0 Possible sense data: 0x0 0x0 0x0.

  cpu17:10107)Vol3: 1767: Error refreshing PB resMeta: Device is permanently unavailable

  Reference: https://kb.vmware.com/selfservice/microsites/search.do?language=en_USandcmd=displayKCandexternalId=2004684

• Question 232:

  Which two statements are true regarding upgrading ESXi 6.x hosts using a USB flash drive? (Choose two.)

  A. The USB flash drive must be mounted from a Windows device with sysconfig installed.
  B. A partition table must be manually created on the USB flash device.
  C. The ks.cfg file must be available to the ESXI 6.x host during bootup on a TFTP server.
  D. The USB flash drive must be formatted using Fat32.
  B. A partition table must be manually created on the USB flash device.
  D. The USB flash drive must be formatted using Fat32.

  ---

  Reference: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.upgrade.doc/GUID-33C3E7D5-20D0-4F84-B2E3-5CD33D32EAA8.html

• Question 233:

  An administrator is performing a silent automatic update of VMware Tools on a Windows virtual machine. What syntax needs to be entered into the Advanced Options box?

  A. /s /v "/qn" /l "c:\Windows\filename.log"
  B. --prefix=/usr/local,/usr/lib,/usr/doc --silent
  C. --prefix=c:\Windows,c:\VMtools --silent
  D. /fs /v "/qn+" /l "c:\Windows\filename.log"
  A. /s /v "/qn" /l "c:\Windows\filename.log"

  ---

  Procedure

  

  Reference: https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.upgrade.doc%2FGUID-B3989445-72A9-4749-A996-CDDCD1FA634D.html

• Question 234:

  An administrator attempts to place a Storage DRS enabled Datastore into Maintenance Mode. The task never completes, and the Entering Maintenance Mode status remains at 1%.

  Which two actions should the administrator take to resolve this problem? (Choose two.)

  A. Set the Storage DRS advanced option IgnoreAffinityRulesForMaintenance = 1.
  B. Set the Storage DRS advanced option IgnoreAffinityRulesForMaintenance = 0.
  C. Disable Storage DRS affinity rules associated with this datastore cluster.
  D. Enable Storage DRS affinity rules associated with this datastore cluster.
  A. Set the Storage DRS advanced option IgnoreAffinityRulesForMaintenance = 1.
  C. Disable Storage DRS affinity rules associated with this datastore cluster.

  ---

  Problem

  A datastore in a datastore cluster cannot enter maintenance mode. The Entering Maintenance Mode status remains at 1%.

  Cause

  One or more disks on the datastore cannot be migrated with Storage vMotion. This condition can occur in the following instances.

  Storage DRS is disabled on the disk.

  Storage DRS rules prevent Storage DRS from making migration recommendations for the disk.

  Solution

  If Storage DRS is disabled, enable it or determine why it is disabled. See Storage DRS is Disabled on a Virtual Disk for reasons why Storage DRS might be disabled. If Storage DRS rules are preventing Storage DRS from making migration

  recommendations, you can remove or disable particular rules.

  In the vSphere Client inventory, right-click the datastore cluster and select Edit Settings.

  Select Rules and click the rule.

  Click Remove.

  Click OK.

  Alternatively, if Storage DRS rules are preventing Storage DRS from making migration recommendations, you can set the Storage DRS advanced option IgnoreAffinityRulesForMaintenance to 1.

  In the vSphere Client inventory, right-click the datastore cluster and select Edit Settings.

  Select SDRS Automation and click Advanced Options.

  Enter 1 in the Value column for IgnoreAffinityRulesForMaintenance.

  Click OK.

  Reference: https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.troubleshooting.doc%2FGUID-91D4FBBC-0677-44DA-B0F2-43A3504F8CA0.html

• Question 235:

  A vSphere Web Client task fails while creating a VMFS datastore on a disk with these characteristics:

  1.

  The disk was formatted with a Master Boot Record (MBR) partition table

  2.

  The disk was not erased

  3.

  The disk is visible in the vSphere Web Client

  What action needs to be performed to resolve the issue?

  A. Delete the partitions manually with partedUtil.
  B. Create a VMFS3 file system first, then upgrade it.
  C. Create a VMFS5 file system with the command esxcli storage filesystem add.
  D. Delete the data with the vmkfstools command.
  A. Delete the partitions manually with partedUtil.

  ---

  Deleting a partition

  A single partition can be deleted from a partition table on a block disk device using the partedUtil command line utility.

  To delete a partition, run this command:

  partedUtil delete "/vmfs/devices/disks/DeviceName" PartitionNumber

  Reference: https://kb.vmware.com/selfservice/microsites/search.do?language=en_USandcmd=displayKCandexternalId=1036609# Deleting a partition

• Question 236:

  Refer to the Exhibit.

  

  An administrator has configured a firewall rule as shown in the Exhibit. Which statement best describes the ESXi 6.x firewall rule?

  A. Connections from the ESXi host to all devices on the 192.168.1.0 network and 192.168.2.220 on port 22 are allowed.
  B. Connections coming from IP addresses from the 192.168.1.0 network and 192.168.2.220 on port 22 are allowed.
  C. TCP Connections coming from IP addresses from the 192.168.1.0 network and 192.168.2.220 on port 22 are not allowed.
  D. TCP Connections from the ESXi host to all devices on the 192.168.1.0 network and 192.168.2.220 on port 22 are not allowed.
  B. Connections coming from IP addresses from the 192.168.1.0 network and 192.168.2.220 on port 22 are allowed.

  ---

  PoRT 22 SSH on ESXi allowed :

  "Allow connections from any IP address," or, you can select "Only allow connections from the following networks" and enter an IP address or subnet. You can enter multiple IP addresses and subnets, separated with a comma. By default,

  there is a set of predefined firewall rules that can be enabled/disabled for the ESXi host from the vSphere Client. These firewall services can be enabled/disabled for the defined ports (UDP/TCP) from the vSphere Client. However, if you need

  to enable the service on a protocol that is not defined, you must create new firewall rules from the command line.

  For example, the DNS Client service can be enabled/disabled only on UDP port 53.

  To enable DNS for TCP:

  Open an SSH connection to the host. For more information, see Using ESXi Shell in ESXi 5.0 and 6.0 (2004746).

  List the firewall rules by running the command:

  # esxcli network firewall ruleset list

  https://kb.vmware.com/selfservice/microsites/search.do?language=en_USandcmd=displayKCandexternalId=2008226

• Question 237:

  An administrator decides to change the root password for an ESXi 6.x host to comply with the company's security policies.

  What are two ways that this can be accomplished? (Choose two.)

  A. Use the Direct Console User Interface to change the password.
  B. Use the passwd command in the ESXi Shell.
  C. Use the password command in the ESXi Shell.
  D. Use the vSphere client to update local users.
  A. Use the Direct Console User Interface to change the password.
  B. Use the passwd command in the ESXi Shell.

  ---

  Limit ESXi Access By default, the ESXi Shell and SSH services are not running and only the root user can log in to the Direct Console User Interface (DCUI). If you decide to enable ESXi or SSH access, you can set timeouts to limit the risk of unauthorized access. ESXi enforces password requirements for direct access from the Direct Console User Interface, the ESXi Shell, SSH, or the vSphere Client. Reference: https://pubs.vmware.com/vsphere-60/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-60-security-guide.pdf

• Question 238:

  An administrator is troubleshooting a CPU performance issue for a virtual machine.

  Which three esxtop counters may demonstrate CPU contention? (Choose three.)

  A. %RDY
  B. %RUN
  C. %MLMTD
  D. %WAIT
  E. %CSTP
  A. %RDY
  C. %MLMTD
  E. %CSTP

  ---

  "%RDY"

  

  The percentage of time the world was ready to run.

  A world in a run queue is waiting for CPU scheduler to let it run on a PCPU. %RDY accounts the percentage of this time. So, it is always smaller than 100%.

  +Q: How do I know CPU resource is under contention?+

  +A: %RDY is a main indicator. But, it is not sufficient by itself.+

  +If a "CPU Limit" is set to a VM's resource settings, the VM will be deliberately held from scheduled to a PCPU when it uses up its allocated CPU resource. This may happen even when there is plenty of free CPU cycles. This time deliberately

  held by scheduler is shown by "%MLMTD", which will be describe next. Note that %RDY includes %MLMTD. For, for CPU contention, we will use "%RDY - %MLMTD". So, if "%RDY - %MLMTD" is high, e.g., larger than 20%, you may

  experience CPU contention.+

  +What is the recommended threshold? Well, it depends. As a try, we could start with 20%. If your application speed in the VM is OK, you may tolerate higher threshold. Otherwise, lower.+

  +Q: How do we break down 100% for the world state times?+

  +A: A world can be in different states, either scheduled to run, ready to run but not scheduled, or not ready to run (waiting for some events).+ 100% = %RUN + %READY + %CSTP + %WAIT.

  +Check the description of %CSTP and %WAIT below.+

  +Q: What does it mean if %RDY of a VM is high?+

  +A: It means the VM is possibly under resource contention. Check "%MLMTD" as well. If "%MLMTD" is high, you may raise the "CPU limit" setting for the VM. If "%RDY - %MLMTD" is high, the VM is under CPU contention.+

  "%MLMTD"

  

  The percentage of time the world was ready to run but deliberately wasn't scheduled because that would violate the "CPU limit" settings.

  Note that %MLMTD is included in %RDY.

  +Q: What does it mean if %MLMTD of a VM is high?+

  +A: The VM cannot run because of the "CPU limit" setting. If you want to improve the performance of this VM, you may increase its limit. However, keep in mind that it may reduce the performance of others.+

  "%CSTP"

  

  The percentage of time the world spent in ready, co-deschedule state. This co-deschedule state is only meaningful for SMP VMs. Roughly speaking, ESX CPU scheduler deliberately puts a VCPU in this state, if this VCPU advances much

  farther than other VCPUs.

  +Q: What does it mean if %CSTP is high?+

  +A: It usually means the VM workload does not use VCPUs in a balanced fashion. The VCPU with high %CSTP is used much more often than the others. Do you really need all those VCPUs? Do you pin the guest application to the VCPUs?+

  Reference:

  https://communities.vmware.com/docs/DOC-9279

• Question 239:

  An administrator is configuring virtual machines to use Worldwide Port Names (WWPNs) to access the storage.

  Which two conditions are required? (Choose two.)

  A. The switches in the fabric must be N-Port ID Virtualization aware.
  B. The virtual machines must be using passthrough Raw Disk Mapping (RDMp).
  C. The virtual machines must be using Virtual Machine Disk (VMDK).
  D. The switches in the fabric must be Storage I/O Control aware.
  A. The switches in the fabric must be N-Port ID Virtualization aware.
  B. The virtual machines must be using passthrough Raw Disk Mapping (RDMp).

  ---

  N-Port ID Virtualization N-Port ID Virtualization (NPIV) is an ANSI T11 standard that describes how a single Fibre Channel HBA port can register with the fabric using several worldwide port names (WWPNs). This allows a fabric-attached N-port to claim multiple fabric addresses. Each address appears as a unique entity on the Fibre Channel fabric How NPIV-Based LUN Access Works NPIV enables a single FC HBA port to register several unique WWNs with the fabric, each of which can be assigned to an individual virtual machine. SAN objects, such as switches, HBAs, storage devices, or virtual machines can be assigned World Wide Name (WWN) identifiers. WWNs uniquely identify such objects in the Fibre Channel fabric. When virtual machines have WWN assignments, they use them for all RDM traffic, so the LUNs pointed to by any of the RDMs on the virtual machine must not be masked against its WWNs. When virtual machines do not have WWN assignments, they access storage LUNs with the WWNs of their host's physical HBAs. By using NPIV, however, a SAN administrator can monitor and route storage access on a per virtual machine basis. The following section describes how this works. Reference: https://pubs.vmware.com/vsphere-4-esx-vcenter/index.jsp#com.vmware.vsphere.config_fc.doc_40/esx_san_config/ managing_san_systems/c_n-port_id_virtualization.html

• Question 240:

  The command esxcli network vm list displays four virtual machines connected to the Production vSwitch. Within the vSphere Web Client, five virtual machines are seen.

  What explains this behavior?

  A. The fifth virtual machine is currently powered off.
  B. The fifth virtual machine has two vnics.
  C. The fifth virtual machine has an invalid IP address.
  D. The fifth virtual machine has an invalid MAC address.
  A. The fifth virtual machine is currently powered off.

  ---

  You can use vCLI network commands to view network statistics and troubleshoot your networking setup. The nested hierarchy of commands allows you to drill down to potential trouble spots.

  1. List all virtual machine networks on a host.

  esxcli network vm list

  The command returns for each virtual machine the World ID, name, number of ports, and networks, as in the following example.

  Reference:

  https://pubs.vmware.com/vsphere51/index.jsp?topic=%2Fcom.vmware.vcli.examples.doc%2Fcli_manage_networks.11.4.html