Business Solution: After the forensics team wrapped up the investigation, it was time to rebuild the entire infrastructure to prevent this situation from happening again.  The entire network, POS systems at every location, two data centers, and a new IT Security infrastructure.  A new PCI compliant POS software system was installed to protect card holder data during transmission for processing, new firewalls, switches, and routers with IDS were purchased to harden the network.  Each location had 15 VLAN's to isolate other business processes from credit card network traffic with additional VLAN's in each data center to isolate credit card data at rest and processing servers.  All credit card traffic became encrypted between POS's all the way to the credit card processor.  The network was setup to prepare for a future breach with network sniffers and/or malware to intercept credit card traffic.  All credit card traffic and storage was encrypted from internal and external threats.  At each location, a new public Wi-Fi connection existed for customers, but with no access to corporate network.  Employees at each location were required to turn off Wi-Fi on a daily basis as a safeguard.  New monitoring software enabled IT Security to proactively receive alerts from tampering, changes, and modifications from systems.