What specific architectural insights do you lose when your network troubleshooting defaults entirely to tracking Layer 3 logical hops while ignoring how Data Link frames behave locally? Furthermore, an IP packet serves as the core global data container routed across diverse subnets, whereas an Ethernet or Wi-Fi frame completely encapsulates that packet to safely transport it node-to-node across a physical wire. How do you effectively isolate complex transmission failures when your diagnostic tools look past Layer 2 hardware encapsulation?