The first main aim of the unit is to provide students with an introduction to operating systems and scripting. The main operating systems topics covered in this unit include operating systems structure and services, process management and coordination, memory management including modern implementations of virtual memory, operating system security, introductory shell scripting, file system, device management, Input/output principles. The main focus will be on the Unix operating system but the different approaches in other operating systems will be explored. The second main aim of the unit is to introduce students to the fundamentals of distributed networked environments, primarily focusing on wired networks but students will examine some of the different approaches in wireless networks. It provides knowledge of internetworking standards and understanding of the networking architecture, technology and operation. This unit will provide students with an understanding of: OSI security architecture; common internet risks and requirements; operation of encryption techniques; digital signatures; public key infrastructure; authentication and non-repudiation; intrusion detection and response; firewall defence. Additionally students will be required to analyse and assess recent developments and future trends in IS security technologies related to networking.