Both TCP/IP and UDP are very popular networking protocol and in this era of the internet and a connected world, they become even more important. No matter, whether you are a computer science graduate or doing masters in computer science, a software engineer, a network engineer, or a Java programmer, good knowledge of TCP/IP and UDP goes a long way to securing a job and doing well on it. Even though I mostly interview for Java programmers, I almost always ask a couple of questions on TCP/IP and UDP protocol to check if the candidate is familiar with computer network basics or not because even if you work for Java application, you are exposed to the network.