I had to mount the ESXi Host CD-ROM to the ESXi shell to perform some tasks and these are the steps to mount the CD-ROM to the ESXi host 
First of all login to the ESXi host using whatever the remote console available (iDRAC, ILO, IMM or CIMC) and mount the ISO
These are the steps for DELL iDRAC and the steps of Mounting the ISO can be different in the other vendors.
Activate the Virtual Media in the iDRAC , Go to “Virtual Media -> Connect Virtual Media” 

Map the CD/DVD media 
Browse the ISO and Map the Device 
Now login to the ESXi host using the SSH console and check the “/vmfs/volumes” to see the CD-ROM, No CD-ROM listed in the Volumes
Load the iso9660 module using “vmkload_mod iso9660”
Find the Path to the CD-ROM using the “esxcfg-mpath -l | grep -i cd-rom” you can find the path as below
 Set the loaded module to the CD-ROM to access via the shell, use “vsish -e set /vmkModules/iso9660/mount <devicename>”
 Now you can see the CD-ROM in the “/vmfs/volumes/” 
You will be able to access the CD-ROM as a normal volume from the ESXi Shell
You can unmount the CD-ROM from this command “vsish -e set /vmkModules/iso9660/umount <devicename>” 
Unload the module from ” vmkload_mod -u iso9660 ” 

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