I think it's safe to assume that every developer who has got a bachelor degree knows what a linked list is (and is familiar with other data structures as well).

I think it's safe to assume that every developer who has got a bachelor degree knows what a linked list is (and is familiar with other data structures as well). However, many incredibly talented developers haven't bothered to memorize how these data structures work and their advantages/disadvantages, and whenever they encounter a situation where they need it, then they can simply Google the best solution within a couple of seconds/minutes. That's why these 'technical interviews' are so ridiculous, because they test theoretical abilities rather than programming abilities.