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In this paper, we explore the 2-extra connectivity and 2-extra-edge-connectivity of the folded hypercube FQ n . We show that κ 2 (FQ n )=3n−2 for n⩾8; and λ 2 (FQ n )=3n−1 for n⩾5. That is, for n⩾8 (resp. n⩾5), at least 3n−2 vertices (resp. 3n−1 edges) of FQ n are removed to get a disconnected graph that contains no isolated vertices (resp. edges). When...
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