the complete reference networking by craig zacker pdf

This is done through simulation of a network device performing packet filtering. In this paper we examine the affects that ordering of the rules in access lists has on the performance of packet filtering. This enforces the search for better or more efficient methods of implementing firewalls. The great expansion in communication and the increased number of users on the Internet place more pressure on firewalls to provide greater security at higher performance levels without being the bottleneck of communication. The result of this inspection determines the decision to be made. against a number of rules in an access list. Each individual incoming or outgoing packet is inspected. Firewalls based on packet filtering provide protection through granting or denying access to passing packets. Packet filtering firewalls are efficient, fast and provide a good level of security and have withstood the test of time. Finally, we discuss some open challenges and opportunities on dynamic defense in cyber security.įirewalls are hardware and software systems that protect a network from attacks coming from the Internet. This is followed with taxonomically summarizing the implementation and evaluation of dynamic defense. Next, we review the architectures, enabling techniques and methods for moving target defense and mimic defense.

Specifically, we firstly introduce basic concepts and define dynamic defense in cyber security. To bridge this gap, we conduct a comprehensive and concrete survey of recent research efforts on dynamic defense in cyber security. The related concepts and development strategies of dynamic defense are rarely analyzed and summarized. Nonetheless, there are few related works that systematically introduce dynamic defense mechanisms for cyber security. Therefore, the difficulty and cost of attack are increasing, which provides new ideas for reversing the asymmetric situation of defense and attack in cyber space. By constructing and implementing the diverse strategy of dynamic transformation, the configuration characteristics of systems are constantly changing and the probability of vulnerability exposure is increasing.

However, security problems in cyber space are becoming serious, and traditional defense measures (e.g., firewall, intrusion detection systems and security audit) often fall into a passive situation of being prone to attacks and difficult to take effect when responding to new types of network attacks with higher and higher degree of coordination and intelligence. Driven by the rapid development of the Internet of Things, cloud computing and other emerging technologies, the connotation of cyber space is constantly expanding and becoming the fifth dimension of human activities.

The complete reference networking by craig zacker pdf