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Test Specific Common Threats
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The threats to your network are real and widespread Here s a list of some of the more common potential threats to your network The sections that follow give details on those threats and explain how to deal with them
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System crashes and other hardware failures Administrative access control weaknesses Malware, such as viruses and worms Social engineering Denial of Service attacks Physical intrusion Rogue access points
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System Crash/Hardware Failure
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Like any technology, computers can and will fail usually when you can least afford for it to happen Hard drives crash, servers lock up, the power fails it s all part of the joy of working in the networking business We need to create redundancy in areas prone to failure (like installing backup power in case of electrical failure) and performing those all-important data backups Beyond that, the idea is to deploy redundant hardware to provide fault tolerance Take advantage of technologies like RAID (Redundant Array of Inexpensive Disks) to spread data across multiple drives Buy a server case with multiple power supplies or add a second NIC NOTE See 18, Network Management, for more information on RAID
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All operating systems and many TCP applications come with some form of access control list (ACL) that defines what users can do with the server s shared resources An access control might be a file server giving a user read-only privileges to a particular
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17: Protecting Your Network
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folder, or an FTP server only allowing certain logins to use certain folders Every operating system and many Internet applications are packed with administrative tools and functionality We need these tools to get all kinds of work done, but by the same token we need to work hard to keep these capabilities out of the reach of those who don t need them EXAM TIP The CompTIA Network+ exam does not test you on the details of file system access controls In other words, don t bother memorizing details like NTFS permissions, but do appreciate that you have fine-grained controls available Make sure you know the super accounts native to Windows (administrator) and Linux and Macintosh OS X (root) You must carefully control these accounts Clearly, giving regular users administrator/root access is a bad idea, but far more subtle problems can arise I once gave a user Manage Documents permission for a busy laser printer in a Windows network She quickly realized she could pause other users print jobs and send her print jobs to the beginning of the print queue nice for her, but not so nice for her co-workers Protecting administrative programs and functions from access and abuse by users is a real challenge, and one that requires an extensive knowledge of the operating system and of users motivations NOTE Administering your super accounts is only part of what s called user account control See Controlling User Accounts later in this chapter for more details
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Malware
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The term malware defines any program or code (macro, script, and so on) that s designed to do something on a system or network that you don t want to have happen Malware comes in quite a variety of guises, such as viruses, worms, macros, Trojans, rootkits, and adware and spyware Let s examine all these malware flavors and then finish with how to deal with them
Virus
A virus is a program that has two jobs: to replicate and to activate Replication means it makes copies of itself, often as code stored in boot sectors or as extra code added to the end of executable programs Activation is when a virus does something like erase the boot sector of a drive A virus only replicates to other drives, such as thumb drives or optical media It does not replicate across networks
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