How many vCMP guest can be deployed with modules ASM, LTM and DNS enabled on BIG-IP 10250v.

so you have 12 vCPU available and can assign these as 12 * 1, 6 * 2, 3 * 4 and 2 * 6.

with the 1 vCPU version you can only provision LTM+GTM, but with the 2 vCPU version it depends on the memory. and then it depends on the version you are running, which one is that?

from version 11.5 the release notes explain how to determine the amount of memory and what is possible then, for example for 12.1: https://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnote-ltm-12-1-0.html

vCMP memory provisioning calculations

The amount of memory provisioned to a vCMP guest is calculated using the following formula: (platform_memory- 3 GB) x (cpus_assigned_to_guest/ total_cpus).

and then if you are between 4 and 8 gig you should be fine for three modules.