Network Security Assignment: Firewall Design, NAT, Proxy Server and VPN
Added on -2019-09-16
This assignment covers topics like designing a firewall decision diagram, advantages and disadvantages of setting up a firewall and/or proxy server, NAT mechanism and its security, and placement of web server in an organization.
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Q1. This homework problem requires you to design a firewall decision diagram for a firewall that protects a private network. In this private network, there is only one server that serves as both an email server and a DNS server. The IP address of this server is 192.168.0.1. This network currently has 49 computers other than the server. The IP addresses used by these 49 computers range from 192.168.0.2 to 192.168.0.50. The firewall has two interfaces: interface 0 which connects the firewall to the outside Internet, and interface 1 which connects the firewall to the private network. The function of this firewall is as follows:A.The 10 computers, whose IP addresses range from 192.168.0.2 to 192.168.0.11, are not allowed to be accessed from the outside Internet.B.The server only accepts TCP packets or UDP packets. The value of the protocol type field of any TCP packet is 6, and the value of the protocol type field of any UDP packet is 17.C.The server is dedicated only to email services and DNS services. The email protocols used by the email services include SMTP (which uses TCP port number 25), POP2 (which uses TCP port number 109), and POP3 (which uses TCP port number 110). To efficiently process multiple connection requests, the email server uses TCP port redirection. The port numbers used in port redirection range from 10000 to 30000. The DNS service uses UDP port number 1949. The traffic to the server that does not belong to any of the above two services is discarded.D.The computers, whose IP addresses range from 192.168.0.12 to 192.168.0.50, are not allowed to run any of the services that are run by the server, but they are allowed to run any other services.Answer: Q2. We need to isolate the CS department network from the rest of the campus network. Some of the reasons are to improve the performance of both parts of the network as well as improve the security of within our CS network. We have discussed the possibility of setting up a firewall / proxy server to facilitate this separation of the network. A.Discuss the advantages and disadvantages of setting up a firewall and / or proxy server. Answer:The advantages are:1.Log maintenance of the users who are using the web.
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