VCP5 Chapter 7

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Author:
daveg
ID:
254438
Filename:
VCP5 Chapter 7
Updated:
2014-01-12 10:56:47
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69 VCP VMWware
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Description:
Chapter review of the VCP certification guide.
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  1. Define the difference between an event and a task:
    Event: An indication of an occurrence in vCenter that was part of running vCenter

    Task: An indication that an admin has permed an action that has yet to complete. A task is an event that an Admin caused to happen
  2. What tab would you use to monitor tasks and events at a host:
    1. Tasks
    2. Tasks and Events
    3. Events 
    4. None of the above
    4. There is no tab at a host to monitor tasks and events. There is an "event" tab and "recent tasks" pane.
  3. What steps would you need to take to show events for just a cluster and not its object?
    Inventory -> Host and Clusters->[Select Cluster Object] - > Tasks & Events Tab -> [Select Events button]  -> [Select small pull down arrow on left corner for "Show Cluster Entries"]
  4. What can you do if the "Show All Entries" and "Keyword Filtering" selections are not available in the "Tasks and Events" tab?
    Click "View" and select "Filtering"
  5. Identify four common memory techniques used by the VMkernels.
    • Transparent Page Sharing (TPS)
    • Balloon Driver Mechansm
    • Memory Compression
    • Swap File
  6. Define TPS
    Transparent Page Sharing where the VMkernal only keeps one copy of a page in physical RAM that is used by multiple VMs.
  7. When is TPS used?
    A. By Default
    B. When there's memory contention
    C. When memory contention exceeds 10% of physical memory 
    D.When memory contention exceeds 25% of available memory
    A By Default. TPS is used regardless of whether or not there's memory contention.
  8. If a VM is using it's swap file, but not ballooning what should you check?
    A. If TPS is properly implemented
    B. B,C, and A
    C. The physical memory
    D. B and C
    E. If VMware Tools is installed on the VM
    E. If VMware tools is properly implemented on the VM.
    (this multiple choice question has been scrambled)
  9. The file vmmemctl is growing. What's the problem?
    VMmemCtl is the balloon driver. It's increasing because the VMkernel has determined that that memory is scarce and is increasing the size of the driver, consuming memory in the shared memory space, and forcing the the guest OS to use more of its swap file (page.file.sys in Microsoft)
  10. What can memory compression reduce the size of the page to?
    A. 2K
    B. 4K
    C. 6K
    D. 8K
    With 100 percent compression, the VMkernel can compress each bage to 2K.Normally, large pages are broken down to 4K.
  11. When is Memory Compression used?
    A. All the time
    B. When memory is scarce
    C. When 10 percent of the memory has been used
    D. When 80 percent of the memory has been used.
    When memory is scarce
  12. How would I adjust the size of the memory compression cache for a VM?
    You can't; it's set for a host.
  13. How would I adjust the size of the memory compression cache for a host?
    Home -> Hosts and Clusters -> Configuration tab -> Software section advanced settings -> Mem ->Mem.MemZipMaxPct. Default is 10% of memory.
  14. The SWAP file has increased, what might be the cause?
    A reservation is reduced.
  15. If the swap file increased when will it decrease?
    A. Immediately
    B. Once you restart the VM
    C. Once you restart the host
    D. Never
    B, once you restart the VM
  16. Which of the following conditions should be considered "serious" and investigated?
    A. A little ballooning
    B. No  ballooning
    C. A lot of ballooning
    C. A lot of ballooning. A little bit is normal.
    (this multiple choice question has been scrambled)
  17. The CPU Ready value is low. What does that indicate?
    A No problem. There is plenty of CPU. 
    B. Big problem. There is insufficent CPU.
    A. No problem.
  18. You are showing a  CPU ready value 2. What does that indicate?
    1. Nothing to be concerned about
    2. Wait time for the CPU resources is higher than normal and the VM is starved for CPU resources.
    3. CPU resource availability is higher than normal and the VM will have plenty of CPU resources available.
    2. Wait time for the CPU resources is higher than normal and he VM is starved for CPU resources
  19. The amount of memory with which you provisioned your VM is called...
    Host Memory
  20. The amount of memory you told your guest it can use is called...
    Host Memory
  21. The amount of memory that the VMkernel thinks it will use to run the virtualized workload is called...
    Overhead memory
  22. The amount of physical memory that has been allocated to the VM is called...
    Consumed memory
  23. What is the main difference in how "Consumed" memory is calculated  on the Resource Allocation tab vs. the Performance tab?
    Resource Allocation tab included overhead memory; the Performance Tab does not include overhead memory.
  24. The amount of memory that is currently being provided from the physical memory of the host is called...
    Private Memory
  25. The total amount of memory that is currently being shared by Transparent Page Sharing (TPS) is called...
    Shared Memory
  26. The amount of memory that is currently being reclaimed by VMkernel swapping is called...
    Swapped Memory
  27. The amount of memory that is currently stored in the  VM's compression cache is called...
    Compressed Memory
  28. The amount of memory reclaimed by the balloon driver is called...
    Ballooned Memory
  29. What value should Balooned Memory be?
    Zero
  30. The amount of memory that has never been accessed by this guest is called...
    Unaccessed Memory
  31. The amount of memory that is currently actively used, an estimate done by statistical sampling is called...
    Active memory
  32. When should you investigate a CPU Ready issue?
    When the value is 1 or 1+ over a sustained period of time
  33. Why use vmxnet3 vNIC drivers?
    A. They can be downloaded for free
    B. They ensure hardware compatibility
    C. Give access to additional troubleshooting tools.
    D. They use advanced troublshooting and perofrmance enhancement techniques
    C. Give access to additional troubleshooting tools.
    (this multiple choice question has been scrambled)
  34. What two factors should you be concerned about when monitoring your storage infrastructure?
    • VMkernal command latency
    • Physical device command latency
  35. If the avg. time spent on a SCSI command is too high the array or host may be overworked. What is considered "too high"?
    A. 15-20ms.
    B. 10-15ms.
    C. 1-2ms
    D. 2-3ms
    D. 2 to 3ms
    (this multiple choice question has been scrambled)
  36. If the avg. time avg. time the phyiscal devices ttake to completea SCSI command is "too high" then the array may be overworked or under designed. What is considered "too high"?
    A. 2-3ms
    B. 1-2ms
    C. 15-20ms.
    D. 10-15ms.
    C. 15-20ms.
    (this multiple choice question has been scrambled)
  37. You're network administrator reports that he is unable to access a host through SNMP. The network is not the problem and nor is security. What is the issue?
    SNMP GETs are disabled by default. To enable it you must use the vicfg-snmp command from the vSphere CLI.
  38. What is the default value for Active Directory Timeouts?
    60 seconds
  39. What four parameters can you adjust for Active Directory connections?
    • Active Directory Timeout
    • Enable Query Limit
    • Enable Validation
    • Validation Period
  40. Active Directory is taking too long to load. What can you do?
    Set the "Enable Query Limit." Without the box selected, all users and groups will appear in the add presmission dialog box.  

    A setting of "0" will preopopulate all users and groups.
  41. What is enable validation in reference to Active Directory?
    Determines if and how frequently (see validation period) the vCenter will check its known AD users against the AD server in the domain
  42. What is the default logging?
    information (Normal Logging)
  43. Vcenter Server is having a problem. How would you restart it?
    • go to Services Microsoft Console (services.msc) on the server. 
    • Scroll to VritualCenterServer
    • Select restart
  44. How do you start ESXi Host Agent?
    Log into the host. From the DCUI select "Troubleshooting Options" and then "Restart Managmenet Agents" and then F11 to confirm.
  45. What are the normal default settings for time out?
    30 seconds for normal operations and 120 seconds for long operations
  46. How would you create a chart for tracking the CPU Ready Value?
    Select Host -> Performance Tab -> Advanced Button -> Chart Options-> [[Most Important; Select Ready Counter]]
  47. What is Resxtop? What enviornment does it run under?
    Resxtop is a vSphere CLI utility that providees a detailed look at how your ESXI uses its resources in real-time. It requires a Linux environment.
  48. What is a "world" in Resxtop?
    A "world" is a VMkernel schedulatable netity, similar to a process or thread in other operations
  49. What is a "group" in Resxtop?
    A "group" can contain multiple worlds.
  50. What do you need to do to run Resxtop?
    • Resxtop only runs on Linux. 
    • You must install a vSphere CLI package on a Linux client or  special Linux virtual appliance, the vSphere Management Assistant (VMA) to your ESXi host or vCenter System.
  51. What do you type from you vCLI to log into a vCenter server?
    resxtop--server servername

    servername  - is the IP address or name of  the host that you want to monitor
  52. How would you determine host performance from Resktop
    • 1. Login to the host
    • resxtop ---server servername

    • 2. view CPU used
    • PCPU USED% - an average of each CPU in ral time. If close ot 100 percent then overcomitting the CPU.
  53. IN Resxtop, what is the difference between PCPU USED% and PCPU UTIL%?
    PCPU USED% = an avg. of each CPU in real time

    PCPU UTIL% = factors in that some totals will include "idle" time and take out the "idle" world before calculating the value. 

    Differences between the two is usually due to hyperthreading, but could be power management technologies.
  54. What key do you press with Resxtop to view available fields?
    f (lower case)
  55. What key do you press to jump to memory statistics?
    m (lowercase)
  56. In Resxtop, what value refers to physical memory?
    PMEM
  57. In Resxtop, what value refers to balloon memory?
    MEMCTL
  58. In Resxtop, what value refers to compressed memory?
    ZIP
  59. In Resxtop, how would I view "virtual disk"
    Press "v" (lowercase)
  60. In Resxtop, how would I view "networking"
    Press "n" key (lowercase)
  61. If I wanted to gather accurate information within Windows about my environment, what could i do?
    Use PerfMon with the VMWare-specific counters availabile when you install VMware Tools
  62. What is the purpose and default threshold for:

    Host CPU Usage
    • Monitors host CPU usage
    • 75% for five min - warning
    • 90% for five min - alert
  63. What is the purpose and default threshold for:
    Host Memory Usage
    • Monitors host physical memory usage.
    • 90% for five min - Warning
    • 95% for five min - Alert
  64. What is the purpose and default threshold for:
    Virtual Machine CPU usage
    • Warning: 75% for five min
    • Alarm: 90 % for five min
  65. What is the purpose and default threshold for:
    Virtual Machine Memory Usage
    • Monitors the use of available memory on each VM
    • Warning: 85% for 10 min
    • Alarm: 95 for 10 min
  66. What is the purpose and default threshold for:

    Datastore usage on a disk
    Disk usage on all configured datastores on each host. 

    • Warning: 75%
    • Alert: 85%
  67. What are the default connectivity alarms in vCenter?
    • 1. Cannot connect to storage
    • 2. Host connection failure
    • 3. Network connectivity lost
    • 4. Network uplink redundancy lost
  68. What does the "Network Connectivity Lost" alarm monitor?
    Network conenctivity of a virtual switch to the hosts to which it is configured
  69. What is the default trigger type when go to create an alarm?
    VM CPU usage
  70. What are the two types of triggers and what are their differences?
    Conditions: Can have a timer

    State and Event: Do not have a timer
  71. If a CPU Ready value is 5% that is
    A. Too high
    B. Just Right
    C. Too low
    B. Just Right. CPU Ready samples vCPU activity every 20 seconds. 5% indicates 1/20seconds, which is the same as saying CPU Ready is a 1.
    (this multiple choice question has been scrambled)
  72. On performance charts CPU Ready value is measured in 
    A) seconds
    B) milliseconds
    C) absolute values
    D) percentage
    A) milliseconds (ms)
    (this multiple choice question has been scrambled)
  73. On esxtop/resxtop CPU Ready value is measured in 
    A) absolute values
    B) percentage
    C) seconds
    D) milliseconds
    B) percentage
    (this multiple choice question has been scrambled)

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