Could anybody can help me explain of the attached image?
I do not know why the firewalls only connect with core switches and the firewall connect together?
Please help me.
Thank you so much.
first of all next time when you have a question you should post it as discussion not a document
regarding your topology, it is high level topology dose not show detailed connections, however it is clear that these firewalls are working in active/standby mode and they are placed in DMZ or security zone to protect some networks where traffic in and out to this secured network has to go via the firewall
hope this help