Figure SharedKey Authentication
Authentication Request Encrypted Challenge One of the greatest weaknesses in shared-key authentication is the fact that it provides an attacker with enough information to try to crack the WEP secret key. The challenge, which is sent from authenticator to requestor, is sent in the clear. The requesting client then transmits the same challenge, encrypted using the WEP secret key, back to the authenticator. An attacker who captures both of these packets has two pieces to a three-piece puzzle the...
Figure Ad Hoc Network Configuration
In an Ad-Hoc network, each participant is free to make a connection with any one other participant directly. Figure 9.2 Infrastructure Network Configuration In Infrastructure mode, wireless clients only communicate directly with the Access Point. Figure 9.2 Infrastructure Network Configuration In Infrastructure mode, wireless clients only communicate directly with the Access Point. To distinguish different wireless networks from one another, the 802.11 standard defines the Service Set...
Understanding WEP Vulnerabilities
Like any standard or protocol,WEP has some inherent disadvantages.The focus of security is to allow a balance of access and control while juggling the advantages and disadvantages of each implemented countermeasure for security gaps.WEP's disadvantages include The RC4 encryption algorithm is a known stream cipher. This means that it takes a finite key and attempts to make an infinite pseudorandom key stream in order to generate the encryption. Altering the secret must be done across the board....
DNS Namespace and Active Directory Integration
Being a Windows 2000 MCSE, you are familiar with the integration between Active Directory and DNS. In many ways, they are very similar and appear to work as one, but they are also very different. That said, since DNS is an industry standard, it runs on several different operating systems Windows, UNIX, Linux, etc. , and it does not require Active Directory in order to run on Windows Server 2003. However,Active Directory does need DNS to function. If you've ever run dcpromo on a Windows 2000 or...
Exam Objectives Frequently Asked Questions Nkd
The following Frequently Asked Questions, answered by the authors of this book, are designed to both measure your understanding of the Exam Objectives presented in this chapter, and to assist you with real-life implementation of these concepts. You will also gain access to thousands of other FAQs at ITFAQnet.com. Q How do I decide between implementing a separate domain versus an organizational unit A You'll want to create a domain if the resources you're attempting to group together have...
Securing DNS Servers
DNS servers provide FQDN and IP address resolution for client machines. Additionally, in a Windows 2000 or Windows Server 2003 domain structure, DNS provides the referrals through LDAP to clients searching for DCs and other domain resources through the maintenance of SRV records within the DNS zone records. These DNS zone records contain FQDN or hostname-to-address mappings for our networks, and with the addition of dynamic DNS capabilities in the last few years, they contain a wealth of...
Exercise Lpn
Using MBSA to Analyze for Updates from the GUI 1. Download the Microsoft Baseline Security Analyzer from 2. Double-click the mbasetup.msi installer. Click Next to progress past the first page of the wizard. 3. Accept the license agreement and click Next to continue. 4. Enter the requested information as shown in Figure 8.66 and click Next to continue. Figure 8.66 Configuring the Installation of MBSA Figure 8.66 Configuring the Installation of MBSA 5. On the Destination Folder page, either...
Note Ywm
In this exercise, we utilize the file server role that we configured in Exercise 8.01. If you removed the role, go ahead and create the base file server outlined in the previous exercise. Exercise 8.02 is illustrated using a standalone server configuration and therefore uses local users and groups in defining access and share permissions. The procedure for creating and securing the file server in a domain environment is similar. To demonstrate the processes used to secure a file server role, we...