Week 5 Quiz - 1. Describe at least 4 external threats to a...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1.   Describe at least 4 external threats to a local area network that is connected to the Internet.  In your answer, also  describe how a network administrator might protect the network from these threats.  One threat is a denial of service (DoS) attack in which external computers bombard the network with data to  tie up its resources.   Companies can safeguard their network against such attacks by using Intrusion Detection  Systems (IDS), and using Network Address Translation (NAD).  IDS can detect when a DoS attack is happening  and alert the network administrator.  Sometimes, IDS can be configured to deal with the attack.   NAT can hide  the IP addresses of computers on a network so the source of the attack doesn't know where to send its packets  meant to overload the system. External networks can also hide rootkits in benign programs (trojan horses).  Rootkits can record keystrokes  the user enters into the computer which hackers can use to access the network or perform other damage.  Rootkits are hard to get rid of, although utilities are available.  Often the solution is to backup critical files and  then re-install the operating system and application software. Viruses and Worms are infectious programs which can copy themselves to multiple computers.  They can  eat up memory, delete files and cause much damage and frustration to users.   Virus Protection software can  detect and remove such forms of malware. Spyware and Spam are also threats to the efficiency of users who can be annoyed with pop-ups, unwanted 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/27/2009 for the course BIS 311 taught by Professor Marshburn during the Fall '08 term at DeVry Cincinnati.

Page1 / 3

Week 5 Quiz - 1. Describe at least 4 external threats to a...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online