A systems engineer tries to mount an iSCSI LUN to a VM host in a...

Comprehensive and Detailed 150 to 200 words of Explanation from CompTIA Cloud CV0-004 Study guide and objectives:

The most likely cause is a Layer 2 segmentation mismatch between the VM host’s storage uplink and the SAN’s iSCSI network. In the provided switch configuration, the VM host storage uplink on GigabitEthernet 1/0/2 is configured as an access port in VLAN 24, while the SAN iSCSI controller ports (GigabitEthernet 1/0/6 and 1/0/7) are placed in VLAN 25. If the VM host’s iSCSI initiator interface is connected to Gi1/0/2, it will be in VLAN 24 and therefore cannot reach iSCSI targets in VLAN 25—preventing discovery entirely (no iSCSI SendTargets responses, no target login).

This aligns with Cloud+ (CV0-004) networking objectives emphasizing network segmentation, correct VLAN placement, and hybrid/virtualized storage connectivity. While jumbo frames (MTU 9000+) can improve iSCSI efficiency, MTU mismatch typically impacts performance or causes large-payload issues—not basic target discovery. Correcting Gi1/0/2 to access VLAN 25 restores Layer 2 adjacency to the iSCSI targets.