diff --git a/src/mcvsphere/mixins/disk_management.py b/src/mcvsphere/mixins/disk_management.py
index 26096ac..d22161b 100644
--- a/src/mcvsphere/mixins/disk_management.py
+++ b/src/mcvsphere/mixins/disk_management.py
@@ -430,6 +430,7 @@ class DiskManagementMixin(VSphereMixin):
         vm_name: str,
         iso_path: str,
         datastore: str | None = None,
+        cdrom_index: int = 0,
         host: str | None = None,
     ) -> dict[str, Any]:
         """Attach an ISO file to a VM's CD/DVD drive.
@@ -438,6 +439,9 @@ class DiskManagementMixin(VSphereMixin):
             vm_name: Name of the virtual machine
             iso_path: Path to ISO file on datastore (e.g., 'iso/ubuntu.iso')
             datastore: Datastore containing the ISO (default: first VM datastore)
+            cdrom_index: Which CD/DVD drive to use, 0-based (default 0 = first).
+                Use 1 for a second drive, e.g. a Cisco answer-file ISO alongside
+                the bootable installer on drive 0.
             host: Managed ESXi host to target (default: the default host)
 
         Returns:
@@ -448,9 +452,19 @@ class DiskManagementMixin(VSphereMixin):
         if not vm:
             raise ValueError(f"VM '{vm_name}' not found")
 
-        cdrom = self._find_cdrom(vm)
-        if not cdrom:
+        cdroms = [
+            d
+            for d in vm.config.hardware.device
+            if isinstance(d, vim.vm.device.VirtualCdrom)
+        ]
+        if not cdroms:
             raise ValueError(f"No CD/DVD drive found on VM '{vm_name}'")
+        if cdrom_index >= len(cdroms):
+            raise ValueError(
+                f"VM '{vm_name}' has {len(cdroms)} CD/DVD drive(s); "
+                f"cdrom_index={cdrom_index} is out of range"
+            )
+        cdrom = cdroms[cdrom_index]
 
         # Determine datastore
         if not datastore: