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MET CS 690 : Network Security

tag 4 Downloads 4 Pages / 953 Words tag 09-11-2020
  • Course Code: MET CS 690
  • University: Boston University
    icon is not sponsored or endorsed by this college or university

  • Country: United States




1). As part of the maintenance contract for a robot in the Manufacturing VLAN, the vendor XYZ Robots, must be able to access the robot remotely through the Internet from their offices for troubleshooting. Your Security Manager has agreed to permit SSH connections for this purpose, but only from the XYZ’s office network. The Security Analyst for XYZ provided the network for this purpose. Write the rule required to enable this business function. (Hint: an explicit outgoing rule already exists.)

2). A new virus is sweeping through the Internet. Infection occurs when an infected document is opened on a user’s machine. Once infected, the computer tries to initiate a TCP connection to a remote server using port 43224 and transmits any information or documents it can collect from your network. Updated virus scan signatures are being pushed to each workstation in the enterprise and scans are being initiated, but this takes time as not all devices are online all the time. Write a rule that will mitigate the impacts of this virus if it has already infected the organization.

3). The Human Resources department is instituting a tele-commute policy, allowing some employees to work from home (or anywhere else they wish). These employees will need to us a Virtual Private Network (VPN) to gain access to the corporate network. The VPN concentrators are assigned IP addresses and and use SSL on TCP port 4343. Write rule(s) that will permit these employees’ use of VPN.  

4). As part of the tele-commute scenario described above, the Human Resources (HR) employees will need to gain access to sensitive information stored within the HR VLAN. Because of the sensitive nature of the information in the HR VLAN, existing firewall rules prevent all incoming connections from the other VLANS in the enterprise. Write a rule that will allow the IP addresses in the pool assigned by the VPN concentrator(s),, to the employees’ workstations after successfully connecting to the VPN to access all resources (all IPs, all ports) within the Human Resources VLAN.

5). An old robot in the Manufacturing VLAN is only capable of accepting Telnet connections. The XYZ Robots (see scenario 1) who supports it requires remote access, but updating the firmware to support SSH is too expensive. Because Telnet sends information in plain-text, your Security Manager will no longer allow Telnet connections from the Internet, effectively preventing XYZ Robots from supporting the machine. As a work around, you’ve suggested that the XYZ use SSH from their offices to connect to a “jump server” in DMZ 1, and then Telnet to the robot from there. The jump server’s IP address is The old robot’s IP address is Write the rules required to enable XYZ’s access to the old robot. (Hint: You’ll need two rules to accomplish this).

6). Although your manufacturing machines require remote access for maintenance, as described in previous scenarios, they do not require access to the Internet. Write a rule that prevents the Manufacturing VLAN from accessing the Internet. Describe where in the ACL you would place this rule in the relation to the rules you wrote for Scenarios 1 and 5.

7). Because RFC 1918 designated “private” IPs are not routed across the Internet, many enterprises explicitly block all connections from those networks at their firewall. Your Security Manager has instructed you to implement this policy on the firewall. Write the rules to complete this task.

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Total 4 pages

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My Assignment Help (2020) Network Security [Online]. Available from:
[Accessed 11 August 2022].

My Assignment Help. 'Network Security' (My Assignment Help, 2020) <> accessed 11 August 2022.

My Assignment Help. Network Security [Internet]. My Assignment Help. 2020 [cited 11 August 2022]. Available from:

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