Which type of intrusion detection system can monitor and alert on attacks, but cannot stop them?

When using Wireshark to acquire packet capture on a network, which device would enable the capture of all traffic on the wire?

Vulnerability mapping occurs after which phase of a penetration test?

Which of the following represent weak password? (Select 2 answers)

In an attempt to secure his wireless network, Bob implements a VPN to cover the wireless communications. Immediately after the implementation, users begin complaining about how slow the wireless network is. After benchmarking the network's speed. Bob discovers that throughput has dropped by almost half even though the number of users has remained the same.
Why does this happen in the VPN over wireless implementation?