ISO/IEC 27033-2:2012

INTERNATIONAL ISO/IEC
STANDARD 27033-2
First edition
2012-08-01
Corrected version
2012-08-15
Information technology — Security
techniques — Network security
Part 2:
Guidelines for the design and
implementation of network security
Technologies de l'information — Techniques de sécurité — Sécurité de
réseau
Partie 2: Lignes directrices pour la conception et l'implémentation de la
sécurité de réseau
Reference number
©
ISO/IEC 2012
©  ISO/IEC 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO/IEC 2012 – All rights reserved

Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviations . 2
5 Document structure . 2
6 Preparing for design of network security . 3
6.1 Introduction . 3
6.2 Asset identification . 3
6.3 Requirements collection . 3
6.3.1 Legal and regulatory requirements . 3
6.3.2 Business requirements . 4
6.3.3 Performance requirements . 4
6.4 Review requirements . 4
6.5 Review of existing designs and implementations . 5
7 Design of network security . 5
7.1 Introduction . 5
7.2 Design principles . 6
7.2.1 Introduction . 6
7.2.2 Defence in depth . 6
7.2.3 Network Zones . 7
7.2.4 Design resilience . 7
7.2.5 Scenarios . 8
7.2.6 Models and Frameworks. 8
7.3 Design Sign off . 8
8 Implementation . 8
8.1 Introduction . 8
8.2 Criteria for Network component selection . 9
8.3 Criteria for product or vendor selection . 9
8.4 Network management . 10
8.5 Logging, monitoring and incident response . 11
8.6 Documentation . 11
8.7 Test plans and conducting testing . 11
8.8 Sign off . 12
Annex A (informative) Cross-references between ISO/IEC 27001:2005/ISO/IEC 27002:2005 network
security related controls and ISO/IEC 27033-2:2012 clauses . 13
Annex B (informative) Example documentation templates . 14
B.1 An example network security architecture document template . 14
B.1.1 Introduction . 14
B.1.2 Business related requirements . 14
B.1.3 Technical architecture . 14
B.1.4 Network services . 17
B.1.5 Hardware/physical layout . 17
B.1.6 Software . 18
B.1.7 Performance . 19
B.1.8 Known issues . 19
B.1.9 References . 19
© ISO/IEC 2012 – All rights reserved iii

B.1.10 Appendices .20
B.1.11 Glossary .20
B.2 An example template for a Functional Security requirements document .20
B.2.1 Introduction .20
B.2.2 Firewall configuration .21
B.2.3 Security risks .21
B.2.4 Security management .22
B.2.5 Security administration .22
B.2.6 Authentication and access control .22
B.2.7 (Audit) Logging .23
B.2.8 Information Security incident management .23
B.2.9 Physical security.23
B.2.10 Personnel security .23
B.2.11 Appendices .23
B.2.12 Glossary .23
Annex C (informative) ITU-T X.805 framework and ISO/IEC 27001:2005 control mapping .24
Bibliography .28

iv © ISO/IEC 2012 – All rights reserved

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The
main task of the joint technical committee is to prepare International Standards. Draft International Standards
adopted by the joint technical committee are circulated to national bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
ISO/IEC 27033-2 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 27, IT Security techniques.
This first edition of ISO/IEC 27033-2 cancels and replaces ISO/IEC 18028-2:2006, which has been technically
revised.
ISO/IEC 27033 consists of the following parts, under the general title Information technology — Security
techniques ― Network security:
 Part 1: Overview and concepts
 Part 2: Guidelines for the design and implementation of network security
 Part 3: Reference networking scenarios – Threats, design techniques and control issues
The following parts are under preparation:
 Part 4: Securing communications between networks using security gateways
 Part 5: Securing communications across networks using Virtual Private Networks (VPNs)
Securing IP network access using wireless will form the subject of a future Part 6.
Further parts may follow because of the ever-changing and evolving technology in the network security area.
This corrected version of ISO/IEC 27033-2:2012 corrects the title on the cover page and on page 1.

© ISO/IEC 2012 – All rights reserved v

INTERNATIONAL STANDARD ISO/IEC 27033-2:2012(E)

Information technology — Security techniques — Network
security
Part 2:
Guidelines for the design and implementation of network
security
1 Scope
This part of ISO/IEC 27033 gives guidelines for organizations to plan, design, implement and document
network security.
2 Normative references
The following referenced documents are indispensable for the application of this document. 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
ISO/IEC 27000:2009, Information technology — Security techniques — Information security management
systems — Overview and vocabulary
ISO/IEC 27001:2005, Information technology — Security techniques — Information security management
systems — Requirements
ISO/IEC 27002:2005, Information technology — Security techniques — Code of practice for information
security management
ISO/IEC 27005:2011, Information technology — Security techniques — Information security risk management
ISO/IEC 27033-1, Information technology ― Security techniques ― Network
...