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COIT12202 – Network Security Concepts

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Added on  2020-03-23

COIT12202 – Network Security Concepts

   Added on 2020-03-23

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COIT12202 – Network Security ConceptsTerm 2, 2017Assessment 2 Short-Answer QuestionsName: ID: Lecturer / Tutor: Course Coordinator: Yufeng LinDue Date: 22-Sep-2017 11:45 PM AESTCOIT12202 – Network Security Concepts1
COIT12202 – Network Security Concepts_1
Table of ContentsShort-answer questions.........................................................................................................................3Reference............................................................................................................................................12Marking Criteria...................................................................................................................................13COIT12202 – Network Security Concepts2
COIT12202 – Network Security Concepts_2
Short-answer questionsYour answer of Question 6:Network address translation (NAT) is a method to remap one IP address space into another space by modifying network address information in Internet Protocol datagram packet headers while in transit across a traffic routing device.Please complete the following tasks:(1) The network address translation is used for limiting the use of public IPaddress in an organization for increasing the security of the network. Therouter installed in a network perceive that the demand is not for an assetinside the system, so they sends data packets to the firewall. For example in case of a small business organization that is using the IPaddress 192.168.0.0 network ID for its intranet connections and has a publicIp address of 172.29.69.1 which it got from the ISP. It can map all the intranetaddress on 192.168.0.0 with the 172.29.69.1 address provided by the ISP forreducing the wastage of the IP address. (2) The network address translation and port address translation differs fromeach other on their methodology. If the site hosted in 10.10.0.0 network isrequired to be connected from the 10.10.10.0 network the NAT can beimplemented for accessing the data. For the implementation of the NAT aDNS server is required to be used and an address pool is required to beconfigured. While in case of PAT the original source port address is masked The PAT is basically a one to many to one connection as opposed toNAT which performs the one to many connection within the network. TheInternal IP Internet IP Port used for PAT are 192.168.3.10 24.30.10.10 5000192.168.3.11 24.30.10.10 5001192.168.3.12 24.30.10.10 5002COIT12202 – Network Security Concepts3
COIT12202 – Network Security Concepts_3
192.168.3.13 24.30.10.10 5003(3) The NAT technology is used for the security of the network and the technology is implemented within a network via a network router. The NAT router acts as an interface in between the WAN and the LAN. This helps the local network to get connected to the global network. In addition to this, the NAT provides various type of security benefits to the network andthe technology is very useful for the network. The NAT act as a single machine having a single IP and hence are very difficult to track. Hence, various systems within the network can access the internet as s single instance of a machine. This provides ample amount of security to the systems. Although all the NAT routers are not meant for security but they can provide a great deal of security for the network. The NAT routers inherit the properties of the firewall in the network. Thealso serve the function as the hardware firewalls for the network. In addition to this, the NAT routers also provide the network security from the unsolicited", unexpected, unwanted, and potentially annoying or dangerous traffic from the public Internet. They prevent these form entering into the private networks for the system. Hence, the NAT technology provides a great deal of security for the networks. COIT12202 – Network Security Concepts4
COIT12202 – Network Security Concepts_4

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