Frank is traveling and wants to connect to an unsecure wired network in his hotel. Which of the following is not a common threat he should consider how to prevent while on an unsecured hotel wired network?

Evil twins are threats for wireless networks, not wired networks. Frank should consider how to keep all his traffic secure, likely by using a VPN that tunnels all his traffic to a trusted network exit point, and both worms and network-based attacks are possible from infected or malicious systems.