ISO/IEC 27033-1:2015

In today's world, the majority of both commercial and government organizations have their information systems connected by networks, with the network connections being one or more of the following:

• within the organization,
• between different organizations,
• between the organization and the general public.

With organizations relying heavily on the use of information and associated networks to conduct their business, the loss of confidentiality, integrity, and availability of information and services could have significant adverse impacts on business operations. There is a major requirement to properly protect networks and their related information systems and information. In other words: implementing and maintaining adequate network security is absolutely critical to the success of any organization?s business operations.

The purpose of this International Standard is to provide detailed guidance on the security aspects of the management, operation and use of information system networks, and their inter-connections. Those individuals within an organization that are responsible for information security in general, and network security in particular, should be able to adapt the material in this International Standard to meet their specific requirements.

ISO/IEC 27033-1:2015 provides an overview of network security and related definitions. It defines and describes the concepts associated with, and provides management guidance on, network security. (Network security applies to the security of devices, security of management activities related to the devices, applications/services, and end-users, in addition to security of the information being transferred across the communication links.)

It is relevant to anyone involved in owning, operating or using a network. This includes senior managers and other non-technical managers or users, in addition to managers and administrators who have specific responsibilities for information security and/or network security, network operation, or who are responsible for an organization's overall security program and security policy development. It is also relevant to anyone involved in the planning, design and implementation of the architectural aspects of network security.

ISO/IEC 27033-1:2015 also includes the following:

- provides guidance on how to identify and analyse network security risks and the definition of network security requirements based on that analysis,

- provides an overview of the controls that support network technical security architectures and related technical controls, as well as those non-technical controls and technical controls that are applicable not just to networks,

- introduces how to achieve good quality network technical security architectures, and the risk, design and control aspects associated with typical network scenarios and network "technology" areas (which are dealt with in detail in subsequent parts of ISO/IEC 27033), and briefly addresses the issues associated with implementing and operating network security controls, and the on-going monitoring and reviewing of their implementation.

Overall, it provides an overview of this International Standard and a "road map" to all other parts.

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies..

ISO/IEC 7498 (all parts), Information technology -- Open Systems Interconnection -- Basic Reference Model: Naming and addressing

ISO/IEC 27001, Information technology -- Security techniques -- Information security management systems -- Requirements

ISO/IEC 27002, Information technology -- Security techniques -- Code of practice for information security controls

ISO/IEC 27005, Information technology -- Security techniques -- Information security risk management