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In this chapter you have learned about various technologies used to secure network traffic, such as SSL for web traffic or IPsec for all IP traffic If you want to make sure that a hacker cannot read the traffic on the network, you need to encrypt your traffic to protect its confidentiality If you have a wireless network, you need to enable some form of encryption, such as WEP Remember that WEP encryption has proved to be crackable; use it only if you don t have another method of encrypting wireless traffic, but try to implement another form of encryption if possible Another really important point to make about a hacker s capturing network traffic is that on a wired network, the hacker must be connected to the network If you enforce rules of physical security, you can protect network traffic For example, many companies will not allow anyone with a laptop to connect to the physical network, because they know that a laptop connected to the network can run a number of security hacks and potentially yield access to corporate data Make sure that you have a policy in place that limits who can connect to the network with devices such as laptops You can enforce this by deactivating network ports until someone wants to use any of them Even then, the user must be granted permission by management, and the port will be activated for only that MAC address
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The last point I want to make about network security is that there are a number of vulnerability scanners available that can scan your network, making you aware of common security mistakes and unpatched systems These vulnerability scanners can inform you of such things as
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n The number of network administrator accounts n Group memberships n Updates that have not been applied n Weak passwords used by user accounts n Common security practices not followed
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The foregoing list is a small example of the features available from vulnerability scanners, such as the Microsoft Baseline Security Analyzer (MBSA) or GFI s Languard You can download both of these tools from the following URLs:
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n Languard
Languard is my favorite of the two and does a better security assessment of your network infrastructure Languard reports a long list of items to you such as a list of user accounts, groups, permissions, open ports, services that are running, and missing patches The benefit of a security scanner is that it can scan the entire network and report all of these issues to you in one screen for all the systems on the network! Figure 12-23 displays Languard
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To practice performing a vulnerability assessment with Languard, check out Exercise 12-8 in LabBookpdf on the CD-ROM This section has introduced a few best practices relating to securing network resources Network security is a huge topic and can t be covered in just a few pages, so I hope that I have given you worthwhile information on just a few quick points If you are interested in learning more on network security, one of the best books on the topic is McGraw-Hill s Hacking Exposed, Sixth Edition (2009) I highly recommend it!
Guidelines to Protect the Network
figUre 12-23
Languard is a security scanner that reports on a number of security issues
training and awareness
One of the most overlooked security measures that can be taken within any organization is training and awareness It is vital to the success of any security protection program that all employees within the organization are given seminars that make employees aware that their actions could cause security incidents One of the best examples I can give is an employee password Passwords should be changed frequently, and when they are changed, they should be strong passwords (mix of letters, number, symbols, and case) If I were the security manager for a company, I would ensure that all employees saw a demonstration on how easy a program such as LC4 can crack simple passwords, but at the same time have difficulty cracking strong passwords This style of training and awareness will show the value of policies such as frequent password changes and the need for strong passwords If we don t make the employees aware, they won t really care There are a number of methods that you can use to train employees The following are a few popular delivery methods:
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