Network and Operating System Security

These articles focus on measures for securing network and OS-level aspects of IT infrastructure.

Security Incident Survey Cheat Sheet for Server Administrators

This succinct reference presents practical tips for examining a suspect system to decide whether to escalate for formal incident response.

Initial Security Incident Questionnaire for Responders

This cheat sheet offers tips for assisting incident handlers in assessing the situation when responding to a qualified incident by asking the right questions.

Network DDoS Incident Response Cheat Sheet

This cheat sheet offers tips for battling a network distributed denial-of-service (DDoS) attack on your infrastructure.

Firewall Deployment for Multitier Applications

This article explores the use of multiple firewalls for protecting resources according to business requirements of multitier applications.

Intrusion Detection Analysis: A Case Study

This paper provides a detailed analysis of several anomalous network events, and illustrates the techniques for examining alerts and logs generated by a network intrusion detection system.

Auditing UNIX Systems: A Case Study

This report presents results of a detailed information security audit of UNIX systems that belong to a fictitious company. It illustrates an approach to performing such an examination.

Network Perimeter Defense Architecture: A Case Study

This paper documents a comprehensive architecture for defending network resources of a fictitious company. It illustrates an approach to setting up a strong security perimeter.