Network Security Fundamentals by Gert DeLaet

By Gert DeLaet

Businesses have lengthy been suffering from threats from the hacking group. preserving speed with the speedy evolution of defense know-how and the growing to be complexity of threats is a problem even within the better of instances. The elevated specialize in protection has despatched IT managers and engineers scrambling to procure the right kind services to enforce advanced, multilayered solutions.Network defense basics introduces the subject of community defense in an easy-to-understand and finished demeanour. This ebook is designed to supply a basic realizing of a number of the elements of a community safety structure and to illustrate how every one part could be carried out to accomplish most sensible effects. The booklet makes use of straight forward language to introduce subject matters and to teach the beneficial properties, mechanics, and performance of assorted community defense units. a sequence of case reports is helping remove darkness from options and exhibits how one can practice the innovations to unravel real-world problems.Divided into 4 components, community protection basics takes you on a travel of all of the crucial applied sciences and glossy defenses at your disposal that will help you hold community uptime and knowledge integrity. half I covers the fundamentals, introducing phrases and ideas and laying the basis of an excellent defense constitution. The dialogue makes a speciality of weaknesses and vulnerabilities in addition to an summary of the conventional defenses used to thwart assaults. half II examines parts of security-cryptography and protection rules. half III seems on the a number of defense parts. Separate chapters conceal net safety, router protection, firewalls, intrusion detection platforms (IDS), distant entry defense, digital inner most networks (VPN), Public Key Infrastructure (PKI), instant defense, and logging and auditing. each one bankruptcy during this part is a self-contained educational, permitting you to pass to these subject matters of maximum curiosity or fundamental difficulty. half IV contains a number of reference appendixes, together with the Cisco secure Blueprint, NSA directions, and SANS policies.Whether you're looking for an creation to community defense rules and practices or a safety configuration reference, this publication provide you with the precious perception you must guard important corporation assets.

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Basically, the attacker can convince any host or network device on the local network that the cracker's workstation is the host to be trusted. This is a common method used in a switched environment. Domain Name Service Spoofing Domain Name Service (DNS) is used for network clients who need an IP address of a remote system based on their names. The host sends a request to a DNS server including the remote system's name, and the DNS Part I: Introduction 39 40 Part I: Introduction server responds with the corresponding IP address.

Files encrypted by a user are accessible Part I: Introduction 55 56 Part I: Introduction only from that user's account. Other users (apart from the administrator) have no access to these files because they are encrypted with individual keys. Special caution needs to be used for data recovery because related certificates with public and private keys need to be restored as well. Figure 3-8 illustrates how to enable this feature for Windows 2000. Figure 3-8. Enable NTFS File Encryption [View full size image] As you can see in Figure 3-8, to encrypt a file or a complete directory, you right-click on the icon.

FIN_WAIT timer Starts after FIN is sent and the originator is waiting for an acknowledgement to terminate the session. • KEEP_ALIVE timer Counter restarts after every segment of data is transmitted. This timer is used to periodically probe the remote end. All these timers are critical for proper and accurate data transmission using TCP/IP. These timers (or lack of certain timers) are often used and exploited by attackers to disable services or even to enter systems. For instance, after step 2 of the three-way handshake, no limit is set on the time to wait after receiving a SYN.

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