Fault Management—Detect, isolate, notify and correct

Question 1:

‘One botnet, called Rustock, was disabled through collaboration between industry and law enforcement in March of 2011. This botnet had approximately 1 million infected computers networked together and was capable of sending up to 30 billion spam emails a day. This botnet was so large that when it was taken down, global spam volumes instantly dropped by 30 percent’.

Bots and botnets—malicious software that secretly controls remote computers—are a growing threat to computers and networks.

In this Discussion, you will consider malicious malware activities and how they are controlled.

To complete this Discussion:

Post: Critically analyse the protocols and systems attackers use to control and update botnets today. Explain the changes over the past five years. State whether or not you believe botnets will continue for the foreseeable future and explain your position. If you do believe botnets will continue, describe the purpose and activities you believe they will conduct in the next five years.

Question 2:

The Domain Name System (DNS) is so essential to network functionality, your text states that ‘if the DNS server crashes, so does the entire Internet!’ (p. 133). Valid statements—that is, data received from and sent by hosts and servers as they were intended—are critical to make the system run properly. This is not always the case; malicious intruders can (and do) change DNS messages inside networks, creating traffic patterns with disastrous effects.

In this Discussion, you will consider how domain name system intrusion works.

To complete this Discussion:

Post: Imagine and describe three general scenarios where network problems, possibly from DNS intrusion, are present. Technically evaluate how an intruder could have inserted or removed DNS messages into the network. Define and analyse possible entry points where the intruder might have possibly gained access to the servers.

Question 3:

The ISO Network Management Model helps IT managers view management as functional areas, allowing clearer decision making and security strategy processes.

The ISO network management model’s five functional areas are listed below (Cisco, no date):

• Fault Management—Detect, isolate, notify and correct faults encountered in the network.
• Configuration Management—Configuration aspects of network devices such as configuration file management, inventory management and software management.
• Performance Management—Monitor and measure various aspects of performance so that overall performance can be maintained at an acceptable level.
• Security Management—Provide access to network devices and corporate resources to authorised individuals.
• Accounting Management—Usage information of network resources.

Reference:

Cisco (No Date) ‘Network management’, Network management system: best practices white paper [Online]. Available from:http://www.cisco.com/c/en/us/support/docs/availability/high-availability/15114-NMS-bestpractice.html#networkmanage (Accessed: 29 April 2014).

In this Discussion, you will consider each of these five areas, and scenarios in which there is some ambiguity about the correct decision regarding each area.

To complete this Discussion

Post: Submit an essay in which you imagine you are a Senior Network Administrator. Describe your encounter with five scenarios; each uniquely corresponded to one of five ISO functional areas, where you would be in a ‘grey area’ about a decision to be made. For each scenario, recommend one different networking tool that might be beneficial.

Question 4 :

On October 27, 1980, there was an unusual occurrence on the ARPANET. For a period of several hours, the network appeared to be unusable, due to what was later diagnosed as a high priority software process running out of control… it is quite interesting to see the way in which unusual (indeed, unique) circumstances can bring out vulnerabilities in network control protocols, and that shall be the focus of this paper.

Reference:

Rosen, E. (1981) Vulnerabilities of network control protocols: an example. [Online]. Available from:http://tools.ietf.org/pdf/rfc789.pdf (Accessed: 29 April 2014).

Network crashes can have big consequences for modern business. In this Discussion, you will analyse this 1980 ARPANET crash, and try to predict the next big network crash yourself.

To prepare for this Discussion:

Read the RFC 789 document: Rosen, E. (1981) Vulnerabilities of network control protocols: an example. [Online]. Available from:http://tools.ietf.org/pdf/rfc789.pdf(Accessed: 29 April 2014).

To complete this Discussion:

Post: Analyse in detail how today’s network management tools and know-how could have prevented the ARPANET crash of 1980.Propose what the next big network crash will be. Logically support your proposal with technical details as to why the crash might occur, and predict the potential consequences.

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