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s1t5
Genuine related question - what is learning TCP/IP good for? When is it useful to know?
vb6sp6
1. When you need to communicate across the network and don't have a library to do it for you.

2. Troubleshooting

3. Insights. Knowing how things work can sometimes give you big insights into potential solutions or pitfalls to avoid

tanelpoder
Additionally, tuning/optimization when dealing with high-latency networks, possibly with more frequent packet loss than you'd get in a local data center (think data replication from Hong-Kong to London in a global bank, etc).
bjourne
Forouzan, TCP/IP Protocol Suite 4th ed
x092
Computer Networks - A Top Down Approach by Kurose Ross gives a very good overview of computer networks and dives deep into each of the layers of the networking stack.