Your company has a Microsoft Hyper-V Server 2008 R2 environment. You manage the
virtual environment by using Microsoft System Center Virtual Machine Manager (VMM) 2008
R2. Virtual machines (VMs) will use Microsoft iSCSI Software Initiator to connect to the
shared storage volumes within the guest operating system. You need to configure the VMM
host server to optimize the network environment for iSCSI traffic. Which two actions should
you perform? (Each correct answer presents part of the solution. Choose two.)
A.
Set the network adapters to 1454 MTU.
B.
Set the network adapters and the supporting infrastructure to support jumbo frames.
C.
Enable RX and TX TCP checksum offload support on the network adapters.
D.
Disable RX and TX TCP checksum offload support on the network adapters.
Explanation:
IPv4 Checksum Offload enables the adapter to verify the TCP/IP checksum on received
packets (Rx) and compute checksum on transmitted packets (Tx). IPv4 Checksum Offload is
configured under TCP/IP Offloading Options properties when Intel® PROSet for Windows
Device Manager is installed. Enabling this feature can improve TCP/IP performance and
reduce CPU utilization. With Offloading disabled, the operating system calculates and
verifies the TCP/IP checksum. TCP Checksum Offload(IPv4) and TCP Checksum
Offload(IPv6)enable the adapter to compute (Tx) or verify (Rx) the TCP checksum of
packets. TCP Checksum Offload is configured underTCP/IP Offloading Options properties
when Intel® PROSet for Windows Device Manager is installed. This feature can improve
performance and reduce CPU utilization. With Offloading enabled, the adapter computes or
verifies the checksum for the operating system.
Jumbo Packetenables Jumbo Packet capability for TCP/IP packets. When large packets
make up the majority of traffic and more latency can be tolerated, Jumbo Packets can
reduce CPU utilization and improve wire efficiency. The standard Ethernet frame size is
1514 bytes, while Jumbo frames can contain 4088 or 9014 bytes. Available settings vary
depending on the specific adapter.
Enable Jumbo Packets only if devices across the network support them and are configured
to use the same frame size. When setting up Jumbo Frames on other network devices, be
aware that network devices calculate Jumbo Frame sizes differently. Some devices include
the header information in the frame size while others do not. back to top Large Receive
Offload (IPv4) sets the adapter to offload the task of segmenting TCP messages into valid
Ethernet frames. Large Receive Offload is configured underTCP/IP Offloading
Optionsproperties when Intel® PROSet for Windows Device Manager is installed.
Because the adapter hardware can complete data segmentation much faster than operating
system software, this feature cam improve transmission performance. The adapter also uses
fewer CPU resources.