In a data-center row, cost is acceptable and no single link failure may isolate a switch, because every switch has a direct link to every other switch. Which topology is that?
Select an answer to reveal the explanation.
Short Explanation
Every desk in the room has its own hallway to every other desk, so closing one hallway never traps anyone. You are looking at a full mesh: each data-center switch links directly to each of the others, and one failed link cannot isolate a switch. A single hub, a wide-area spoke, or a mesh that skips some pairs does not match a link between every pair.
Full Explanation
In a full mesh, every switch has a link to every other switch. The cost is accepted, which matches the stem. If any one link fails, each switch still has its remaining direct links, so no switch is isolated. A star ties every switch to one hub. One failed hub isolates the attached switches, and the edges are not linked to each other. Hub-and-spoke gives each site one path to a center. A failed spoke isolates that site. A partial mesh is the tempting twin because many pairs do have direct links. Some pairs do not, so one failure can still isolate a switch, which the stem rules out. Exam caveat: a full mesh of layer-2 switches will loop unless spanning tree or a routed design handles the extra paths. The topology answer is still the mesh. Operational check: list the neighbors of each switch and confirm every other switch appears once, then shut one link and confirm no switch loses the rest of the row. A pair with no direct link means the row is not the full mesh the design described. Count the links before you call a partial row complete.