Exam 350-601 topic 1 question 177 discussion

D is wrong according to https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus1000/sw/4_2_1_s_v_1_5_1/system_management/configuration/guide/n1000v_system/n1000v_system_13iscsi.html#wp1052813 shouldn't it be C??

Option D (initiators and targets in separate subnets) is preferred for achieving iSCSI multipathing because it allows for multiple independent network paths, enabling effective load balancing and failover. Option B (bonding two NICs on the initiator) is less suitable because NIC bonding creates a single logical interface, limiting true multipathing capabilities. It lacks the granular path management needed for iSCSI multipathing, as it abstracts the individual interfaces, preventing the initiator from managing multiple discrete paths effectively. Option D is correct for iSCSI multipathing.

B. two NICs bonded together on the initiator Explanation: For optimal multipathing in iSCSI traffic, using two NICs bonded together on the initiator provides redundancy and increased throughput. This design ensures: 1. Redundancy: If one NIC fails, the other continues to handle traffic without disruption. 2. Load Balancing: Traffic can be distributed across the two NICs to improve performance. 3. Multipathing Support: When properly configured with a multipath I/O (MPIO) solution, bonded NICs enable efficient path failover and management.

Recommended design is D) C and D are possible options but D) is more recommended. Answer: D)

Per VM documentation https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-4C19E34E-764C-4069-9D9F-D0F779F2A96C.html Looks like we have 2 answers for this question which is C&D. Port binding on Initiator will allow to create multiple paths to single target. We can create multiple paths by configuring multiple ports and target portals on different IP subnets. In this situation port binding is not in use. In this particular question I would reply C but we should have possibility to choose 2 answers.

I found other sources of this same exam, that appears to be a 2 choises question: "What are two recommended design choices in a topology for multipathing iSCSI traffic? (Choose two.) A: two NICs bonded together on the initiator B: dual initiators to a single target with bonded interfaces C: initiators and targets in separate subnets D: dual initiators to dual targets E: single initiator to dual targets" In this case, would be B and C.

A is correct

D is right, because there will be two subnets for each two initiator and two targets

I think this makes more sense: https://blog.spotodumps.com/index.php/2020/11/10/nov-2020-new-2020-ccie-ccnp-350-601-dccor-dumps-with-vce-and-pdf-from-spoto-update-questions/ The storage system is just what it is, what is usually redundant is the cabling (network) and the initiator of the communication itself, eg two cards in case one fails. So dual initiator instead of dual target.

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/5_0/configuration/guides/ipsvc/nxos/ipsvc/ciscsi.html#53504 As you can see here there are many HA (High availability) solutions but the multi-path one uses different subnets between initiators and targets.

Answer D seems to be correct: You can create multiple paths by configuring multiple ports and target portals on different IP subnets. By keeping initiator and target ports in different subnets, you can force ESXi to create paths through specific ports. In this configuration, you do not use port binding because port binding requires that all initiator and target ports are on the same subnet. https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-4C19E34E-764C-4069-9D9F-D0F779F2A96C.html

I think it´s option A. Because multipath it's about redundancy on the destination or target for the initiator, so I think the best answer it´s A.

Any reference, please?