2-connectivity is the basic graph theoretical metric for fault tolerance to node failures, and it is an extremely desirable property in network design. For a one-dimensional finite ad hoc network formed by n nodes uniformly and independently distributed in a closed interval [0, z] (z ∈ R + ), we give a closed form expression for the probability that a connected one-dimensional finite ad hoc network becomes disconnected after removing a node. We also sketch a procedure of finding the exact formula for 2-connectivity in a one-dimensional ad hoc network.