You are configuring networking for a new Windows Server 2003 SP2 virtual machine (VM) in
a Windows Server 2008 R2 Hyper-V environment. You need to configure the VM to achieve
optimum network performance. Which two actions should you perform? (Each correct
answer presents part of the solution. Choose two.)
A.
Install Integration Services on the VM.
B.
In the virtual machine settings, add a Network Adapter.
C.
In the virtual machine settings, add a Legacy Network Adapter.
D.
Configure a fixed maximum transmission unit (MTU) size of 1384 on the host server
virtual network adapter.
Explanation:
Bandwidth throttling may need to be adjusted for specific network configurations. The
bandwidth throttling that is outlined in the following table provides control only for the
outgoing traffic of a physical network adapter. To ensure end-to-end QoS and optimal
network performance, refer to the QoS documentation from your network switch and router
provider.\ you install the integration services, which improve performance and integration
with the physical computer. Hyper-V includes a software package for supported guest
operating systems that improves integration between the physical computer and the virtual
machine. This package is referred to as integration services. Newer versions of supported
Windows operating systems include the integration services and do not require installation
after you install the guest operating system. For more information about which operating
systems are supported and which of those require you to install integration services
Although the I/O performance of physical SCSI and IDE devices can differ significantly, this
is not true for the virtualized SCSI and IDE devices in Hyper-V. Hyper-V. IDE and SCSI
devices both offer equally fast I/O performance when integration services are installed in the
guest operating A legacy network adapter works without installing a virtual machine driver
because the driver is already available on most operating systems. The legacy network
adapter emulates a physical network adapter, multiport DEC 21140 10/100TX 100 MB. A
legacy network adapter also supports network-based installations because it includes the
ability to boot to the Pre-Boot Execution Environment (PXE). The legacy network adapter is
not supported in the 64-bit edition of Windows Server2003 or the WindowsXP Professional
x64 Edition. To connect a virtual machine to a virtual network, you add a virtual network
adapter to the virtual machine and then connect the virtual network adapter to an existing
virtual network. There are two types of network adapters available for Hyper-V: a network
adapter and a legacy network adapter. The network adapter is designed specifically for
Hyper-V and requires a virtual machine driver that is included with the Hyper-V integration
services. This type of networking adapter provides better performance than a legacy network
adapter and is the recommended choice when it can be used. Because this type of virtual
network adapter requires integration services in the guest operating system, it can be used
only with guest operating systems for which integration services are available The legacy
network adapter emulates an Intel 21140-based PCI Fast Ethernet Adapter. This type of
network adapter provides networking capabilities for two scenarios: when using a guest
operating systems for which integration services are not available, and when network boot
capabilities are required. The legacy network adapter uses a driver that is available in most
operating systems, instead of a Hyper-V specific driver. The legacy network adapter also
provides the ability to boot to the Pre-Boot Execution Environment (PXE). MaximumTransmission Unit (MTU) Different physical networks have different maximum frame sizes.
Within the different frames, there is a maximum size for the data field. This value is called
the maximum transmission unit (MTU), or maximum packet size in TCP/IP terms.
If an IP datagram is to be sent out onto the network and the size of the data grams bigger
than the MTU, IP will fragment the datagram, so that it will fit within the data field of the
frame. If the MTU is larger than the network can support, then the data is lost. The value of
MTU is especially important when bridging is used because of the different network limits.
RFC 791 – Internet Protocols states that all IP hosts must be prepared to accept datagrams
of up to 576 bytes. Because of this, it is recommended that an MTU of 576 bytes be used if
bridging (or routing) problems are suspected. Note: MTU is equivalent to the PACKET SIZE
value on the GATEWAY statement, or the MAXMTU value when using
BSDROUTINGPARMS in the TCPIP PROFILE file.
