TAILIEUCHUNG - Network+ Certification (Outline) - Chapter 13: Network security

In this chapter, students will be able to understand: Password policies ensure that users choose effective passwords; user-level security requires a separate account for each user; in share-level security, all users access shares by using the same passwords; a firewall is a hardware or software product that protects a network from unauthorized access, using techniques such as packet filtering, NAT, or proxy servers;. | Chapter 13 Network Security 1 Chapter Overview A. Password Protection B. Security Models C. Firewalls D. Security Protocols Chapter 13 Lesson 1 Password Protection 2 1. Using Passwords A. Passwords are the most common method of securing network resources. B. There are security mechanisms other than passwords. 1. Smart cards a. Credit card-like devices with a magnetic strip b. Must be run through a card reader connected to a computer for a user to access the network 2. Biometric devices a. Identify users by scanning unique physical characteristics such as thumbprints or retina patterns C. Passwords can be an effective security mechanism or they can be useless depending on how they are used. 1. The strength of any password protection is based on the password policies that administrators set. 2. When users create their own passwords they tend to choose short simple ones or use information that is easy to guess such as birthdays or initials or they use no password at all. 3. Assigning complex passwords to users can be equally ineffective because the users might be compelled to write them down and leave them in obvious places. 4. The object is to find a middle ground between these two extremes. D. Most operating systems include tools that enable administrators to impose password policies on users. 1. Users can be forced to a. Choose passwords of a specific length b. Change passwords at regular intervals 2. These tools provide a middle ground that lets users choose effective passwords that they can remember easily. 3. Password policies are typically available in network operating systems that use a directory service to authenticate users and grant them access to network resources. a. You can set password policies on Windows 2000 and Microsoft Windows NT domain controllers and Novell NetWare servers. b. You cannot set password policies in Microsoft Windows Me Microsoft Windows 98 or Microsoft Windows 95. 3 2. User Account Password Settings A. When you create a new user .

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