TAILIEUCHUNG - CompTIA Network+ Certification Study Guide part 45

CompTIA’s Network+ certification Study Guide part 45 is a globally-recognized, vendor neutral exam that has helped over 235,000 IT professionals reach further and higher in their careers. The 2009 Network+ exam (N10-004) is a major update with more focus on security and wireless aspects of networking. Our new study guide has been updated accordingly with focus on network, systems, and WAN security and complete coverage of today’s wireless networking standards. | 426 CHAPTER 9 Security Standards and Services Technologies and methodologies exist that can help safeguard against spoofing of these capability challenges. These include as follows Using firewalls to guard against unauthorized transmissions Not relying on security through obscurity the expectation that using undocumented protocols will protect you Using various cryptographic algorithms to provide differing levels of authentication Test Day Tip Knowledge of TCP IP is really helpful when dealing with spoofing and sequence attacks. Having a good grasp of the fundamentals of TCP IP will make the attacks seem less abstract. Additionally knowledge of not only what these attacks are but also how they work will better prepare you to answer test questions. Subtle attacks are far more effective than obvious ones. Spoofing has an advantage in this respect over a straight vulnerability exploit. The concept of spoofing includes pretending to be a trusted source thereby increasing the chances that the attack will go unnoticed. If the attacks use just occasional induced failures as part of their subtlety users will often chalk it up to normal problems that occur all the time. By careful application of this technique over time users behavior can often be manipulated. EXERCISE ARP Spoofing Address Resolution Protocol ARP spoofing can be quickly and easily done with a variety of tools most of which are designed to work on UNIX OSs. One of the best all-around suites is a package called dsniff. It contains an ARP spoofing utility and a number of other sniffing tools that can be beneficial when spoofing. To make the most of dsniff you ll need a Layer 2 switch into which all of your lab machines are plugged. It is also helpful to have various other machines doing routine activities such as Web surfing checking POP mail or using Instant Messenger software. 1. To run dsniff for this exercise you will need a UNIX-based machine. To download the package and to check compatibility visit .

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