Maintaining and servicing the computers, laptops and peripherals are essential requirements of the students. The clear understanding of computer network devices and protocols are also taught in this subject. On completion of this practical, the students can identify the major components of CPU, understand the principle of operations of all the interfacing boards, IO/Memory slots and interfacing devices, know the use of diagnostic software, trouble shoot the problems in Laptop, understand the different layers of OSI and their functions. Compare different LAN protocols, and they can identify the protocols used in TCP /IP and compare with OSI model. Use of IP addressing and TCP/ IP protocols briefly.