2V0-621 · Question #56
Which two statements are true regarding iSCSI adapters? (Choose two.)
The correct answer is A. Software iSCSI adapters require vmkernel networking. B. Independent Hardware iSCSI adapters offload processing from the ESXi host. Software iSCSI depends on vmkernel networking for its TCP/IP stack, while Independent Hardware iSCSI adapters use an onboard engine to fully offload iSCSI processing from the host.
Question
Which two statements are true regarding iSCSI adapters? (Choose two.)
Options
- ASoftware iSCSI adapters require vmkernel networking.
- BIndependent Hardware iSCSI adapters offload processing from the ESXi host.
- CDependent Hardware iSCSI adapters do not require vmkernel networking.
- DIndependent Hardware iSCSI adapters require vmkernel networking.
How the community answered
(29 responses)- A93% (27)
- C3% (1)
- D3% (1)
Why each option
Software iSCSI depends on vmkernel networking for its TCP/IP stack, while Independent Hardware iSCSI adapters use an onboard engine to fully offload iSCSI processing from the host.
Software iSCSI uses the ESXi host's general-purpose CPU and VMkernel TCP/IP stack to process iSCSI traffic, so it must be bound to vmkernel ports associated with physical NICs in order to send and receive iSCSI frames.
Independent Hardware iSCSI adapters are dedicated HBAs that contain their own onboard TCP/IP and iSCSI protocol engines, handling all iSCSI and network processing internally and thereby offloading that work from the ESXi host CPU.
Dependent Hardware iSCSI adapters use the host's VMkernel network stack and TCP/IP implementation rather than an onboard engine, so they DO require vmkernel port configuration - stating they do not is incorrect.
Independent Hardware iSCSI adapters are fully self-contained HBAs that manage their own TCP/IP and iSCSI processing without relying on VMkernel networking, so stating they require vmkernel networking is incorrect.
Concept tested: iSCSI adapter types and vmkernel networking dependencies
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