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In regard to patching systems, you must also harden network devices and network servers Hardening a system or a device is the process of removing unnecessary features that you are not using For example, after installing a Windows 2000 Server you will notice that IIS is installed by default You learned in the preceding exercise that anyone can delete files on your unpatched IIS 50 box If you are not planning on hosting web sites on the server, you should uninstall the IIS service this is the concept of hardening Hardening an operating system or network device is a time-consuming process because you have to research the operating system or device and find out what software is installed by default You then must verify whether you actually need that feature, and if not, remove the feature This process involves a lot of paperwork, and you really must do your homework to determine what is needed and what is not; otherwise, you could cause the system or device to be dysfunctional by removing the wrong operating system component

Asynchronous communications are one of the most problematic areas in providing comprehensive internetwork services to an organization We covered the security aspects of dial-up networking in Chap 7 with CHAP and use of a TACACS server The main challenge of asynchronous communications, however, is providing reliable service to users The chief issue is minimizing drops while transporting what is typically LAN-based traffic over an asynchronous link A LAN operates at 10 Mbps or above, whereas modems at best connect at 288 kbps, but very often, due

Hardening a server and then applying any updates or patches to the server is a very effective method of securing the server It is not the be-all and end-all of network security, but combined with firewalls and data encryption, it can go a long way to securing your environment As part of your hardening practice, you will want to make sure that you have renamed any built-in accounts, such as the Administrator account Once you have renamed the account, you may even create a new user account named Administrator and assign a really strong password to this account The benefit is that a hacker who obtains the password for that account will only have user privileges on the system and also needs to figure out which of your accounts is the real Administrator account In connection with passwords, you must also make sure that all accounts are using strong passwords For more information on creating a password policy, refer to 10 To audit users passwords and be certain that their passwords are strong, you could use a password auditor such as LC4

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

TCP TCP TCP and UDP TCP and UDP TCP TCP TCP TCP TCP TCP TCP TCP TCP and UDP TCP TCP and UDP TCP TCP UDP TCP

12:

.

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

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

1 5 7 13 17 19 20 21 23 25 31 37 42 43 53 67 68 69 79

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: