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COIT20262 Advanced Network Security

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Question:

An educational institute has a single router, referred to as the gatewayR, connecting its internal network to the Internet. The institute has the public address range 142.66.0.0/16 and the gateway router has address 142.66.123.1 on its external interface (referred to as interface ifout). The internal network consists of three subnets:

A DMZ, which is attached to interface ifdmz of the gateway router and uses address range 142.66.13.0/24.
A small network, referred to as shared, with interface ifin of the gateway router connected to two other routers, referred to as staffR, and studentR. This network has no hosts attached (only three routers) and uses network address 10.4.0.0/16.A staff subnet, which is for use by staff members only, that is attached to the staffR router and uses network address 10.4.10.0/24.A student subnet, which is for use by students only, that is attached to the studentR router and uses network address 10.4.20.0/24. 
 
The gateway router also runs a stateful packet filtering firewall and performs port address translation. In addition to the DMZ setup as described above, security requirements for the educational institute are:
External Internet users cannot access any internal computers (except in DMZ and as stated in other requirements).
Staff and students can access websites in the Internet.The SSH server in the DMZ can only be accessed by external Internet users from subnets: 31.13.75.0/24 and 23.63.9.0/24.

Considering the above information, answer the following questions:
(a) Draw a diagram illustrating the network. Although there may be many computers in the staff and student subnets, for simplicity you only have to draw three computers in the staff subnet and three computers in the student subnet. Label all computers and router interfaces with IP addresses.
 
Defense-in-depth is an important principle in network security. Consider you are advising a company in deploying a WiFi network. You advise them to use all of the following security mechanisms to provide defense-in-depth. For each mechanism, give a brief description of the mechanism and how it works, explain the main advantage of the mechanism, and explain themain disadvantage of the mechanism.
(a) WPA
(b) Using antennas, transmit power and AP positioning to control radio range
(c) RADIUS (or similar) authentication
(d) Manual detection of rogue APs.
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