For an interconnection network G, the ω-wide diameter d ω (G) is the least ℓ such that any two vertices are joined by ω internally-disjoint paths of length at most ℓ, and the (ω − 1)-fault diameter D ω (G) is the maximum diameter of a subgraph obtained by deleting fewer than ω vertices of G.The enhanced hypercube Q n,k is a variant of the well-known hypercube. Yang, Chang, Pai, and Chan gave an upper bound for d n+1 (Q n,k ) and D n+1 (Q n,k ) and posed the problem of finding the wide diameter and fault diameter of Q n,k . By constructing internally disjoint paths between any two vertices in the enhanced hypercube, for n ≥ 3 and 2 ≤ k ≤ n we prove thatis the diameter of Q n,k . These results mean that interconnection networks modelled by enhanced hypercubes are extremely robust.