Lesson Focus
What this lesson covers
Linux+ tests interface-level issues because they produce confusing symptoms that look like application failures until you recognize the network layer problem. This episode explains MTU mismatch as a classic cause of partial connectivity, where small packets succeed but larger packets fail, leading to timeouts in protocols that require fragmentation behavior. You’ll learn bonding concepts at an exam level: combining interfaces for redundancy or throughput, and how misconfiguration can create flapping links, asymmetric routing, or inconsistent performance. We also introduce dual-stack surprises as the IPv4/IPv6 coexistence issues that can break connectivity when name resolution returns an address family the network path doesn’t support. The goal is to help you treat these as pattern-based problems with identifiable symptoms rather than “random network weirdness.”
