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70-659 · Question #133

70-659 Question #133: Real Exam Question with Answer & Explanation

The correct answer is 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.. 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 R PROSet for Windows Device Manager is under TCP/IP Offloading Options properties when Intel○ ins

Question

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.)

Options

  • ASet the network adapters to 1454 MTU.
  • BSet the network adapters and the supporting infrastructure to support jumbo frames.
  • CEnable RX and TX TCP checksum offload support on the network adapters.
  • DDisable 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 R PROSet for Windows Device Manager is under TCP/IP Offloading Options properties when Intel○ 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 R PROSet for Windows Device Manager is underTCP/IP Offloading Options properties when Intel○ 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 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.

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