Section 2 – Configure ESX/ESXi Networking
- Objective 2.1 – Configure Virtual Switches
The VMXNET 3 adapter is only supported on which virtual machine hardware version?
VMXNET 3 is supported only for virtual machines version 7 and later.
What is the name of the new high performance paravirtualized adapter available on vSphere 4?
VMXNET 3 adapter is the next generation of a paravirtualized NIC designed for performance.
ESX uses one of the strongest block ciphers available, what is it?
D.256 bit AES
Cipher Strength To ensure the protection of the data transmitted to and from external network
connections, ESX Server uses one of the strongest block ciphers available-256-bit AES block encryption.
In vSphere 4 what is the Maximum amount of ports supported on a vSwitch?
Configuration Maximums VMware® vSphere 4.0 and vSphere 4.0 Update 1, page 6.
Table 5. Networking Maximums Virtual network switch ports per standard switch 4088
vSphere virtual switches are configured, based on the number of physical uplinks bound, in which of the following methods?
A.vSwitch with a binding to another vSwitch and one or more NICs
B.vSwitch with none, one or more NICs
C.vSwitch with bindings to a virtual machine, and HBA and the Service Console
D.vSwitch with one, two or more NICs
The diagram above shows two vSphere virtual switches configured with zero, one and two physical uplinks respectively.
The vSwitch or vSwitch port group policy setting that allows a virtual machine to listen to traffic other than that which is specifically destined for the given VM is?
B.MAC Address Changes
Promiscuous Mode passed on the vSwitch that are allowed under the VLAN policy for the port group that the adapter is connected to.
The primary VLAN in a Private VLAN is considered?
The primary VLAN is considered Promiscuous as shown below.
When creating a dvPort group, which of the following port binding options assigns a port to a virtual machine the first time the virtual machine powers on after it has been connected to the dvPort Group?
vSphere4 Documentation Notes vReference.com Version 1.0 Page 1 [email protected] Main Documentation Set, page 15. dvPort group properties include:
Port Binding – when ports are assigned to virtual machines connected to this dvPort group.
Static binding – to assign a port to a virtual machine when the virtual machine is connected to the dvPort group.
Dynamic binding – to assign a port to a virtual machine the first time the virtual machine powers on after it is connected to the dvPort group.
Ephemeral – for no port binding.
An administrator is creating a vNetwork Standard Switch with Service Console and VMkernel networking. The administrator has two uplinks attached to the switch, but wants to separate the Service Console and VMkernel traffic to the two uplinks. Which of the following Load Balancing Policies will guarantee this, even if additional management or virtual machine traffic is added to the switch in the future?
A.Route based on source MAC hash
B.Use Explicit Failover
C.Route based on the originating port ID
D.Route based on IP hash
ESX Configuration Guide ESX 4.0 vCenter Server 4.0, page 43.
Load Balancing Specify how to choose an uplink.
Route based on the originating port ID – Choose an uplink based on the virtual port where the traffic entered the virtual switch. If additional management or virtual machine traffic is added to the switch under this policy, it is possible that different uplinks could be used.
Route based on ip hash – Choose an uplink based on a hash of the source and destination IP addresses of each packet. For non-IP packets, whatever is at those offsets is used to compute the hash. Selection is based on the source and destination IP address under this policy, so it is possible based on the connections IP characteristics that different uplinks could be used.
Route based on source MAC hash – Choose an uplink based on a hash of the source Ethernet. If additional management or virtual machine traffic is added to the switch, since selection is based on the source MAC address, so it is possible that different uplinks could be used.
Use explicit failover order – Always use the highest order uplink from the list of Active adapters which passes failover detection criteria. This is the only policy that specifies the order of uplinks regardless of any connectivity information.
Assuming VLANs are not configured, which of the following is true about traffic from a virtual machine connected to a port group on a vNetwork Standard Switch with no uplinks?
A.Virtual machines on any virtual switch on the same ESX Server can receive the traffic
B.The virtual switch will drop the packets if no uplink is present
C.Only virtual machines in the same port group on the virtual switch can receive the traffic
D.Virtual machines in any port group on the virtual switch can receive the traffic
VMware Virtual Networking Concepts, page 6.
It is possible, and even reasonable, to assign the same VLAN ID to multiple port groups.
This would be useful if, for example, you wanted to give different groups of virtual machines different physical Ethernet adapters in a NIC team for active use and for standby use, while all the adapters are on the same VLAN.
Since a port group without an assigned VLAN has an implicit VLAN ID of 0, all port groups without a VLAN ID will be in VLAN0. Multiple port groups with the same VLAN can communicate with each other.
Physical Ethernet adapters serve as bridges between virtual and physical networks. In VMware Infrastructure, they are called uplinks, and the virtual ports connected to them are called uplink ports.
If no uplink exists there will be no communication with physical networks, but traffic will propagate across virtual interfaces connected to the same switch.