Section 8 – Perform Basic Troubleshooting and Alarm Management
- Objective 8.3 – Perform Basic Troubleshooting for Networking
QUESTION 24
Host certificate checking is enabled by default and SSL certificates are used to encrypt network traffic.
A.False
B.True
Answer: B
Explanation:
ESX Configuration Guide, ESX 4.0, vCenter Server 4.0, page 172.
Host certificate checking is enabled by default and SSL certificates are used to encrypt network traffic.
QUESTION 25
Which of the following commands can be used to display information about virtual switches?
A.ifconfig
B.esxcfg-info
C.vmware-info
D.esxcfg-vswitch
Answer: BD
Explanation:
One of the first things you can do is inspect the current virtual switch configuration. This is done with the following command:
QUESTION 26
A network administrator has asked you to enable NetQueue to improve networking performance for virtual machines on an ESX Host. Where is this feature enabled (Choose Two)?
A.On the virtual NIC in the virtual machine
B.On the Properties tab for the virtual switch
C.On the physical network adapter driver
D.In the Advanced Settings for the VMkernel
Answer: CD
Explanation:
Enabling Support for NetQueue on the Intel 82598 10 Gigabit Ethernet Controller
To enable VMDq:
1.Enable NetQueue in VMkernel using VI3 Client.
a.Choose Configuration > Advanced Settings > VMkernel.
b.Select the checkbox for VMkernel.Boot.netNetqueueEnabled.
2.Enable the ixgbe module in the service console of the ESX Server host:
# esxcfg-module -e ixgbe
3.Set the required NetQueue options for the ixgbe module:
For a single port and the maximum number of receive queues, use the command:
# esxcfg-module -s “InterruptType=2 VMDQ=16” ixgbe
For two ports, add the values in a comma-separated list for each parameter as shown in
the following example:
# esxcfg-module -s “InterruptType=2,2 VMDQ=16,16” ixgbe
QUESTION 27
By default, VMware supports the following Path Selection Policies (Choose Three)?
A.Least I/O
B.Least Busy
C.Fixed
D.MRU (Most recently used)
E.Round Robin
Answer: CDE
Explanation:
A “Multivendor Post” on using iSCSI with VMware vSphere
When it comes to path selection, bandwidth aggregation and link resiliency in vSphere, customers have the option to use one of VMware’s Native Multipathing (NMP) Path Selection Policies (PSP), 3rd party PSPs, or 3rd party Multipthing Plug-ins (MPP) such as PowerPath V/E from EMC.
VMware ships with a set of native SATPs, and 3 PSPs: Fixed, Most Recently Used (MRU), & Round Robin (RR). Fixed and MRU options were available in VI3.x and should be familiar to readers. Round Robin was experimental in VI3.5, and is supported for production use in vSphere (all versions)
QUESTION 28
Which type of virtual NIC must be used for a 32 bit Windows Server 2003 server in an MSCS cluster?
A.Flexible
B.vmxnet
C.e1000
D.pro1000
Answer: C
QUESTION 29
Which of the following network drivers is only supported with Virtual Machine version 7?
A.E1000
B.vmxnet3
C.Enhanced vmxnet
D.Flexible
Answer: B
Explanation:
VMXNET 3 is supported only for virtual machines version 7 and later
QUESTION 30
In vSphere, a bound physical NIC can be configured to transmit and receive Jumbo Frames. What is the Maximum Transmission Unit (MTU) for Jumbo Frames in vSphere?
A.5000
B.9000
C.9500
D.5500
Answer: B
Explanation:
ESX Configuration Guide ESX 4.0 vCenter Server 4.0, page 58.
Jumbo frames allow ESX to send larger frames out onto the physical network. The network must support jumbo frames end-to-end. Jumbo frames up to 9kB (9000 bytes) are supported.
