2V0-621 Online Practice Questions and Answers

Correct Answer: A

Explanation: 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

Correct Answer: AD

If the memory usage value is high, and the host has high ballooning or swapping, check the amount of free physical memory on the host. A free memory value of 6% or less indicates that the host cannot handle the demand for memory. This leads to memory reclamation, which might degrade performance. If the host has enough free memory, check the resource shares, reservation, and limit settings of the virtual machines and resource pools on the host. Verify that the host settings are adequate and not lower than those set for the virtual machines. D-) Verify that VMware Tools is installed on each virtual machine. The balloon driver is installed with VMware Tools and is critical to performance. If Vmware tools are not installed/outdated showing on summary tab Ballooning will not work hence swapping will work because it has nothing to do with ballooning. Fact: If memory is not available the memory can med mapped to the .vswp file on a vmfs or nfs datastore. The virtual machine has no knowledge if the memory is mapped to physical memory or to a disk. This is called hypervisor swapping, and this is the last resort for the vmkernel to use this mechanism.(Internal vmware KB article but for external you may check VMBlog or external links: https://kb.vmware.com/ selfservice/microsites/search.do? language=en_USandcmd=displayKCandexternalId=1003470)

Correct Answer: BD

Determine whether the high ready time for the virtual machine resulted from its CPU usage time reaching the CPU limit setting. If so, increase the CPU limit on the virtual machine.

Increase the CPU shares to give the virtual machine more opportunities to run. The total ready time on the host might remain at the same level if the host system is constrained by CPU. If the host ready time doesn't decrease, set the CPU reservations for high-priority virtual machines to guarantee that they receive the required CPU cycles.

Reference: https://pubs.vmware.com/vsphere-4-esx-vcenter/index.jsp?topic=/com.vmware.vsphere.dcadmin.doc_41/ vsp_dc_admin_guide/performance_statistics/c_troubleshoot_cpu.html

Correct Answer: C

Explanation: Restart the Management Network Restarting the management network interface might be required to restore networking or to renew a DHCP lease. Restarting the management network will result in a brief network outage that might temporarily affect running virtual machines. If a renewed DHCP lease results in a new network identity (IP address or host name), remote management software will be disconnected. Procedure

1.

From the direct console, select Restart Management Network and press Enter.

2.

Press F11 to confirm the restart.

Reference: https://pubs.vmware.com/vsphere-50/index.jsp?topic=% 2Fcom.vmware.vsphere.install.doc_50%2FGUID-E46F9F62-D1BB-4485-815D-08DBAE320CC3.html

Correct Answer: BD

To reclaim unused storage blocks on a VMFS datastore for a thin-provisioned device, run this command:

esxcli storage vmfs unmap --volume-label=volume_label|--volume-uuid=volume_uuid --reclaimunit=number

The command takes these options:

-l|--volume-label=volume_label

The label of the VMFS volume to UNMAP. This is a mandatory argument. If you specify this argument, do

not use -u|--volume-uuid=volume_uuid.

-u|--volume-uuid=volume_uuid

The UUID of the VMFS volume to UNMAP. This is a mandatory argument. If you specify this argument, do

not use -l|--volume-label=volume_label.

-n|--reclaim-unit=number

The number of VMFS blocks to UNMAP per iteration. This is an optional argument. If it is not specified, the

command uses a default value of 200.

Reference: https://kb.vmware.com/selfservice/microsites/search.do?

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Correct Answer: CD

To disable the HA error message:

1.

Log in to vCenter Server.

2.

Right-click the cluster and click Edit Settings.

3.

Click vSphere HA > Advanced Options.

4.

Under Option, add an entry for das.ignoreInsufficientHbDatastore.

5.

Under Value, type true.

6.

Click Cluster Features.

7.

De-select Turn on vSphere HA and click OK.

8.

Wait for all the hosts in the cluster to deconfigure HA, then right-click the cluster and click Edit Settings.

9.

Click Cluster Features. 10.Click Turn on vSphere HA. 11.Click OK.

Reference: https://kb.vmware.com/selfservice/microsites/search.do? language=en_USandcmd=displayKCandexternalId=2004739

Correct Answer: B

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?

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Correct Answer: AC

Use VMCA as an Intermediate Certificate Authority You can replace the VMCA root certificate with a third-party CA-signed certificate that includes VMCA in the certificate chain. Going forward, all certificates that VMCA generates include the full chain. You can replace existing certificates with newly generated certificates. This approach combines the security of thirdparty CA-signed certificate with the convenience of automated certificate management.

Procedure 1 Replace the Root Certificate (Intermediate CA) The first step in replacing the VMCA certificates with custom certificates is generating a CSR and adding the certificate that is returned to VMCA as a root certificate. 2 Replace Machine SSL Certificates (Intermediate CA) After you have received the signed certificate from the CA and made it the VMCA root certificate, you can replace all machine SSL certificates. 3 Replace Solution User Certificates (Intermediate CA) After you replace the machine SSL certificates, you can replace the solution user certificates. 4 Replace the VMware Directory Service Certificate If you decide to use a new VMCA root certificate, and you unpublish the VMCA root certificate that was used when you provisioned your environment, you must replace the machine SSL certificates, solution user certificates, and certificates for some internal services. 5 Replace the VMware Directory Service Certificate in Mixed Mode Environments During upgrade, your environment might temporarily include both vCenter Single Sign-On version 5.5 and vCenter Single Sign-On version 6.0, you have to perform additional steps to replace the VMware Directory Service SSL certificate if you replace the SSL certificate of the node on which the vCenter Single Sign-On service is running.

Reference: https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.security.doc%2FGUID5FE583A2-3737-4B62-A905-5BB38D479AE0.html

Correct Answer: A

The STS service issues Security Assertion Markup Language (SAML) tokens. These security tokens represent the identity of a user in one of the identity source types supported byvCenter Single Sign-On. The SAML tokens allow both human users and solution users who authenticate successfully to vCenter Single Sign-On to use any vCenter service that vCenter Single Sign-On supports without authenticating again to each service.

Reference: https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.install.doc%2FGUID90C1E3DC-4397-4BF0-808E-DF3802E56BC6.html

Correct Answer: A

Reduce Memory Overhead for Virtual machines with 3D graphics Option

Virtual machines with the 3D graphics option enabled can have higher memory consumption than other

virtual machines. You can reduce the memory overhead by editing the configuration file (.vmx file) of your

virtual machines and disabling certain memory related settings. Reducing the memory overhead of virtual

machines can help you increase the number of virtual machines per host.

Prerequisites

Verify that your virtual machines are using hardware version 10 or later.

Procedure

1 Shut down the virtual machine on which the 3D graphics option is enabled.

2 Disable the Accelerate 3D Graphics option.

3 Upgrade your ESXi host to use the features available in hardware version 10 or later.

4 Set the maximum size of your display to the size you need.

5 Locate the configuration file (.vmx) of your virtual machine.

6 Open the virtual machine configuration file in a text editor and add the line, vga.vgaOnly=TRUE.

This option removes all graphics and SVGA functionality from your SVGA device, but does not remove the

settings that allow BIOS to enter VGA mode.

7 Save the changes and exit the text editor.

8 Power on your virtual machine and check the display console.

9 Verify the memory reservation settings in the vmware.log file.

Reference:

https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.vm_admin.doc%2FGUIDFAB0E2C3-3474-461D-99BC-549F7E21FE85.html

Correct Answer: B

Delete a Content Library

When you no longer need a content library, you can invoke the delete method on either the LocalLibrary or

the SubscribedLibraryservice depending on the library type.

Procedure

1Access the SubscribedLibrary or the LocalLibrary service by using the vCloud Suite Endpoint.

2Retrieve the library ID you want to delete.

3Call the delete function on the library service and pass the library ID as argument.

All library items cashed on the storage backing are removed asynchronously. If this operation fails, you

must manually remove the content of the library. https://pubs.vmware.com/vsphere-60/

index.jsp#com.vmware.vapi.progguide.doc/GUID-C3A2DD49-BF41-43CD-9AEC-D6F28A9F3AF4.html?

resultof=%2522%

Correct Answer: B

Explanation: Procedure

1.

Connect to the DCUI of the host.

2.

From the Network Restore Options menu, select Restore vDS.

3.

Configure the uplinks and optionally the VLAN for the management network.

4.

Apply the configuration.

The DCUI creates a local ephemeral port and applies the values you provided for the VLAN and uplinks.

The DCUI moves the VMkernel adapter for the management network to the new local port to restore

connectivity to vCenter Server.

Next Steps:

After the connection of the host to vCenter Server is restored, correct the configuration of the distributed

port group and re-add the VMkernel adapter to the group. For information about networking rollback,

recovery, and restore, see the vSphere Networking documentation: Wait until vCenter Server applies the

settings within the next 24 hours.

Correct Answer: CD

: Considerations

1.

You cannot change software FCoE boot configuration from within ESX

2.

Coredump is not supported on any software FCoE LUNs, including the boot LUN.

3.

Multipathing is not supported at pre-boot.

4.

Boot LUN cannot be shared with other hosts even on shared storage

Reference: https://pubs.vmware.com/vsphere-60/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenterserver-60-storage-guide.pdf

Correct Answer: ABC

Scripted ESXi installation Running a script is an efficient way to deploy multiple ESXi hosts with an unattended installation. The installation script contains the configuration data for the ESXi hosts that you want to install. You can

apply the script to all hosts that you want to have a similar configuration. Notes:

1.

The script must be created using supported commands.

2.

Ensure you consider all disks that are connected to the host at the time of installation to avoid

inadvertently overwriting data. Disk names can vary from machine to machine, one of the settings that you

may want to configure and double check in a script is the disk selection for the ESXi installation.

3.

The host installation script must be stored in a location that the host can access by FTP. HTTP, HTTPS,

NFS, USB flash drive, or CD-ROM drive. The installation media can be mounted on the host locally,

remotely, or through PXE boot.

Reference: https://kb.vmware.com/selfservice/microsites/search.do?

language=en_USandcmd=displayKCandexternalId=2109708#Script

Correct Answer: AB

Cause

This issue occurs when the vCenter Server instance being upgraded is connected to a SQL server which

was upgraded and the vCenter Server database compatibility level is not changed to match the SQL server

version.

Resolution

To resolve this issue, change the database compatibility level to match the SQL Servers level.

To change the database compatibility level:

Right-click the vCenter Server database and click Properties.

Click Options.

Change the compatibility level that matches the SQL server version.

Using the vSphere Command Line Interface (CLI), you can upgrade ESXi 5.x hosts to version 6.0.

For more information about upgrading ESXi 5.x hosts using esxcli commands, see the Upgrading Hosts by

Using esxcli Commands

Reference: https://kb.vmware.com/selfservice/microsites/search.do?

language=en_USandcmd=displayKCandexternalId=2006904