In ordinary life, we often say that "two heads are better than one". The equivalent in computer science is called Metcalfe's Law. Simply put, the more computers are linked together in a group, the more useful each one of them becomes...not just marginally, but by quite a lot.
This is a pseudo-mathematical explanation of why (a)the internet is so cool, and (b)networking and telecommunications are so important. Undergraduate courses in this field typically include some general computer science courses so that students can understand the basic principles of operating systems and other computing concepts. The focus, however, is on data communications.
Networking and telecommunications graduates have a thorough understanding of all networking architectures, from the hardware level right through to application interfaces. A master's degree prepares you for advanced design roles using specific technologies, while doctorates are usually only attempted by people who wish to teach networking and telecommunications at the college level.
As the constant availability of computer networks and telecommunications channels is essential to modern business, this is a demanding and sometimes thankless job. You can expect to be "on call" at virtually all times, including for PBKAC (Problem Between Keyboard and Chair) issues. On the other hand, when things are running smoothly, there are often long periods of downtime, allowing you to hone your technical skills or look at cat videos on the internet.