VCP-410 Q&A – Configure ESX/ESXi Networking (21-31)

Section 2 – Configure ESX/ESXi Networking

• Objective 2.1 – Configure Virtual Switches

QUESTION 21
When setting up the iSCSI software initiator on an ESX Server, which virtual switch port types are required? (Choose Two.)
A.iSCSI
B.virtual machine
C.Service Console
D.VMkernel
Answer: CD

Explanation:
With the software-based iSCSI implementation, you can use standard network adapters to connect your ESX/ ESXi host to a remote iSCSI target on the IP network. The software iSCSI initiator that is built into ESX/ESXi facilitates this connection by communicating with the network adapter through the network stack.
Before you configure the software iSCSI initiator, you must perform the following tasks:
1 Create a VMkernel port for physical network adapters. [D above]
2 Enable the software iSCSI initiator.
3 If you use multiple network adapters, activate multipathing on your host using the port binding technique.
4 If needed, enable Jumbo Frames. Jumbo Frames must be enabled for each vSwitch through the vSphere
CLI. Also, if you use an ESX host, you must create a VMkernel network interface enabled with Jumbo Frames.
Networking Configuration for Software iSCSI Storage Server Configuration Guide : Networking Scenarios and Troubleshooting : Networking Configuration for Software iSCSI Storage
The storage you configure for an ESX Server host might include one or more storage area networks (SANs) that use iSCSI, which is a means of accessing SCSI devices and exchanging data records using TCP/IP protocol over a network port rather than through a direct connection to a SCSI device. In iSCSI transactions, blocks of raw SCSI data are encapsulated in iSCSI records and transmitted to the requesting device or user.
Before you can configure iSCSI storage, you must create a VMkernel port to handle iSCSI networking and a service console connection to the iSCSI network. [C and D above].

QUESTION 22
Which two statements are true about port groups and VLANs? (Choose Two)
A.Only one VLAN can be specified in a port group.
B.The same VLAN cannot be specified in multiple port groups.
C.Multiple port groups can specify the same VLAN.
D.Multiple VLANs can be specified in a port group.
Answer: AC
Explanation:
Mastering Vmware vSphere, page 162.
A port group can be associated with only one VLAN at a time. [A above]
The screen shot below shows two port groups with the same VLAN. [C above]

QUESTION 23
Which is a valid traffic shaping adjustment?
A.minimum bandwidth adjusted in mbps
B.peak bandwidth adjusted in kbps
C.peak bandwidth adjusted in mbps
D.minimum bandwidth adjusted in kbps
Answer: B
Explanation:
See below.

QUESTION 24
What is necessary to connect a running virtual machine to a newly created vSwitch VLAN inside an ESX Server?
A.power off the virtual machine, connect it to the newly created VLAN, and power it
back on again using the VI Client
B.connect to the newly created VLAN using the VI Client
C.install the proper network device inside the virtual machine
D.install the appropriate VLAN tagging software inside the virtual machine
Answer: B

QUESTION 25
Which of the following statements best describe network traffic shaping (Choose Two)?
A.Network traffic shaping can limit inbound peak bandwidth
B.Network traffic shaping can limit outbound peak bandwidth
C.Network traffic shaping can limit inbound average bandwidth
D.Network traffic shaping can limit outbound average bandwidth
Answer: BD
Explanation:
vSphere Help
ESX/ESXi allows you to shape outbound traffic on virtual switches. The traffic shaper restricts the network bandwidth available to any port, but may also be configured to temporarily allow “bursts” of traffic to flow through a port at higher speeds.
A traffic shaping policy is defined by three characteristics: average bandwidth, peak bandwidth, and burst size.
Average Bandwidth – Establishes the number of bits per second to allow across a port, averaged over time-the allowed average load.
Burst Size – The maximum number of bytes to allow in a burst. If this parameter is set, a port may gain a burst bonus when it doesn’t use all its allocated bandwidth. Whenever the port needs more bandwidth than specified by Average Bandwidth, it may be allowed to temporarily transmit data at a higher speed if a burst bonus is available. This parameter tops the number of bytes that may be accumulated in the burst bonus and thus transferred at a higher speed.
Peak Bandwidth – The maximum number of bits per second to allow across a port when it is sending a burst of traffic. This tops the bandwidth used by a port whenever it is using its burst bonus. This parameter can never be smaller than the average bandwidth.

QUESTION 26
Which of the following statements are true about network traffic shaping? (Choose Two.)
A.The settings affect only outbound traffic.
B.The settings affect only inbound traffic.
C.The settings are defined on a per port group basis.
D.The settings affect inbound and outbound traffic.
Answer: AC
Explanation:
“defined on a per port group basis. ” could be considered a correct answer because according to the VMWare Infrastructure 3:Install and Configure guide, “Traffic shaping may be defined at the virtual switch OR Port Group level. ” The important distinction here is that they can be defined at this level, but they are APPLIED on a per-virtual machine basis or more directly, to the VM’s virtual NIC’s.

QUESTION 27
Virtual machine (VM) A is connected to virtual switch A, and VM B is connected to virtual switch B.
Which statement is true about the network traffic between A and B?
A.Traffic between VM A and VM B stays within ESX Server.
B.Traffic between VM A and VM B flows through the physical NIC.
C.VM A can communicate with VM B if they have same port group policies.
D.VM A can communicate with VM B if they have same security policies.
Answer: B
Explanation:
VMware Virtual Networking Concepts, page 5.
Network traffic cannot flow directly from one virtual switch to another virtual switch within the same host.
Therefore an external switch is required.

QUESTION 28
Which two statements are true about virtual switches in ESX Server? (Choose two.)
A.A service console port group can be created on a virtual switch used for virtual machine traffic.
B.Virtual switches can be created with or without physical NICs.
C.A VMotion port group must not be created on a virtual switch used for virtual machine traffic.
D.Virtual switches cannot be created without physical NICs.
Answer: AB
Explanation:
The screenshot below shows a virtual switch with a service console port group present on
a virtual switch used for virtual machine traffic, without a physical NIC.

The screenshot below shows a virtual switch with a service console port group present on
a virtual switch used for virtual machine traffic, with a physical NIC.

QUESTION 29
Suppose you have 65 virtual machines configured on a single ESX Server. You want to provide outbound connectivity for all of them. What is the minimum number of virtual switches you would need to support this configuration?
A.4
B.3
C.2
D.1
Answer: D
Explanation:
Configuration Maximums VMware® vSphere 4.0 and vSphere 4.0 Update 1, page 6.
Table 5. Networking Maximums Item Maximum
Virtual network switch ports per standard switch 4088

QUESTION 30
Which two statements are true about network traffic shaping? (Choose two.)
A.The settings affect only traffic being sent out the uplink adapter to the physical network.
B.The settings affect all vSwitch traffic.
C.The settings are defined on a per port group basis.
D.The settings affect only traffic coming into the uplink adapter from the physical network.
E.The settings are defined on a per-virtual machine basis.
Answer: AC
Explanation:
“defined on a per port group basis. ” could be considered a correct answer because according to the VMWare Infrastructure 3:Install and Configure guide, “Traffic shaping may be defined at the virtual switch OR Port Group level. ” The important distinction here is that they can be defined at this level, but they are APPLIED on a per-virtual machine basis or more directly, to the VM’s virtual NIC’s.

QUESTION 31
Which two statements are true about internal-only virtual switches? (Choose two.)
A.They allow a group of virtual machines to communicate only with each other.
B.They can contain multiple port groups.
C.They disallow service console access to the virtual machines.
D.They are required for virtual machines to use private IP addresses.
Answer: AB
Explanation:
VMware Virtual Networking Concepts, page 6.
Uplink Ports
Uplink ports are ports associated with physical adapters, providing a connection between a virtual network and a physical network. Physical adapters connect to uplink ports when they are initialized by a device driver or when the teaming policies for virtual switches are reconfigured.
Some virtual switches should not connect to a physical network and thus have no uplink port, as shown in Figure 2. This is the case, for example, for a virtual switch that provides connections between a firewall virtual machine and the virtual machines protected by the firewall.