Criticality of a Network Design in a CCTV Security System

For any CCTV Surveillance Security System, deployed in large industrial Security Camera Installationsetups- the role of network design is very important, as it is design of the system which decides the performance of overall Camera Security System, rather than the quality or specifications of individual camera itself.  I am not saying that we should ignore the specifications of camera in such a case, but it is like in a class a highly qualified professor gives his best lecture to the students, but due to large size of class, his voice is not reaching all his audience. In such a case, it is not the professor who is giving a bad lecture, but his lecture will still be perceived as useless for students at the back, as his voice is not reaching to the last student of the class.