Final answer:
To find out where packets are getting stuck, Bob should use the Tracert utility, which helps in identifying the path and pinpointing delays or hang-ups across the network.
Step-by-step explanation:
If Bob, a network professional, wants to find out where packets are getting stuck on the path to their destination, he should use the Tracert utility. Tracert stands for Trace Route and is a command-line tool used to determine the path taken by packets to reach a specific networked device. It not only shows the path but also measures transit delays of packets across an Internet Protocol (IP) network. The tool provides a list of routers that the packets pass through, identifying where a packet may be getting hung up.
Other utilities mentioned, like Wireshark, are used for different purposes such as packet analysis. Netstat displays network connections and routing tables, and IPCONFIG is used to show the current TCP/IP network configuration values on a computer.