Which CHAP authentication mechanism is available when using software iSCSI and dependent hardware iSCSI?

Can someone please clarify the answer according to vSphere 5 Docs answer should be (A)Mutual Chap, (D)One-Way Chap

http://pubs.vmware.com/vsphere-50/index.jsp?topic=/com.vmware.vsphere.storage.doc_50/GUID-3F97FB05-3C92-4040-84E7-D928555B3808.html

Choosing CHAP Authentication Method
ESXi supports one-way CHAP for all types of iSCSI initiators, and mutual CHAP for software and dependent hardware iSCSI.

Before configuring CHAP, check whether CHAP is enabled at the iSCSI storage system and check the CHAP authentication method the system supports. If CHAP is enabled, enable it for your initiators, making sure that the CHAP authentication credentials match the credentials on the iSCSI storage.

ESXi supports the following CHAP authentication methods:

One-way CHAP
In one-way CHAP authentication, also called unidirectional, the target authenticates the initiator, but the initiator does not authenticate the target.

Mutual CHAP
In mutual CHAP authentication, also called bidirectional, an additional level of security enables the initiator to authenticate the target. VMware supports this method for software and dependent hardware iSCSI adapters only.

As per VCP mock exam the actual question should read

“Which CHAP authentication mechanisms are ONLY available when using software and dependent hardware iSCSI adapters (Choose Two)?”

ONLY being the key part which means (a)Mutual Chap and (c)Per-target correct.

Ed is absolutely right

A and D

http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc_50%2FGUID-488A90C3-4826-4EB7-BAA4-E9C799AA2C02.html

Set Up CHAP Credentials for iSCSI Initiator
You can set up all targets to receive the same CHAP name and secret from the iSCSI initiator at the initiator level. By default, all discovery addresses or static targets inherit CHAP parameters that you set up at the initiator level.

The CHAP name should not exceed 511 alphanumeric characters and the CHAP secret should not exceed 255 alphanumeric characters. Some adapters, for example the QLogic adapter, might have lower limits, 255 for the CHAP name and 100 for the CHAP secret.

Prerequisites
■ Before setting up CHAP parameters for software or dependent hardware iSCSI, determine whether to configure one-way or mutual CHAP. Independent hardware iSCSI adapters do not support mutual CHAP.

■ In one-way CHAP, the target authenticates the initiator.

■ In mutual CHAP, both the target and the initiator authenticate each other. Use different secrets for CHAP and mutual CHAP.

When you configure CHAP parameters, verify that they match the parameters on the storage side.

Aaaahhhhhhhhhhhhhhhhhhh C is ALSO CORRECT!!!

ESXi and vCenter Server 5 Documentation > vSphere Storage > Configuring iSCSI Adapters and Storage

For software and dependent hardware iSCSI adapters, ESXi ALSO SUPPORTS PER-TARGET CHAP authentication, which allows you to configure different credentials for each target to achieve greater level of security.

http://pubs.vmware.com/vsphere-50/index.jsp#com.vmware.vsphere.storage.doc_50/GUID-AC65D747-728F-4109-96DD-49B433E2F266.html?resultof=%2522%2570%2565%2572%252d%2574%2561%2572%2567%2565%2574%2522%2520

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