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QUESTION:
a) Below is a capture of an Ethernet II frame which has an IPv4 packet and a segment. Provide the source MAC address in hexadecimal; the source IP address, the length, and the header checksum of the packet in decimal; the source port number in decimal and thus deduce the application layer protocol and whether this capture relates to a response or request message.
00 13 02 4a 88 97 00 15 56 3a 4c 79 08 00 45 0000 4c ae 91 40 00 3c 06 01 9b ca 7b 02 1a c0 a801 42 00 19 04 35 aa 36 09 bb e5 30 36 00 50 1840 b0 05 fa 00 00 32 35 30 20 6f 6b 3a 20 20 4d
b) A company occupies 3 floors of a building plus the basement. Each floor is occupied by one department and adds the office of one senior manager responsible for each department. About 30 PCs having internet access are expected on each floor. The basement accommodates various server machines. For security reasons the senior managers should be accessible from the other machines only via a firewall router. The company uses a private internal network: 192.168.1.0./24. The company has an ADSL connection to the Internet. As part of this arrangement the ISP issues the company with a single public Internet address: 202.123.21.144.
Show a full network diagram for the company and make sure you identify any network devices, transmission technology and media. You have to give the IP, subnet mask and gateway addresses for all devices and servers that you find pertinent to your design. You have to also devise a scheme to allow the single public IP address to be shared among the whole staff and give special server configurations to meet company's goals. Provide the network configuration for 1 staff PC and 1 senior manager PC from each department.
QUESTION: a) Explain four issues that are generally addressed in the Needs Analysis phase in the building-block approach to network design. b) Sketch a typical hybrid star-b
Network-Based IDS (NIDS) A NIDS resides on computer or appliance connected to segment of an organization’s network and looks for signs of attacks. While examining packets, a NID
NEED FOR SECURITY Primary mission of information security to ensure that the systems and contents stay the same If no threats, could focus on improving the systems, resulting in
In the e-mail system, where the e-mail messages are saved and why? E-mail messages are saved in user’s private electronic mailbox. A mailbox refers to a local/domestic hard drive c
Please see attached file
Q. Explain the random key distribution? The triple key management mechanisms ensure a better and complete security solution using the random key distribution mechanism. In this
COLLISION DETECTION The signals from two devices will interfere with each other and the overlapping of frames is known a collision. It does not cause to the hardware but data
DIRECT INDEXING It is less usually known method. It is possible only is cases where protocols address are given from a compact range. In the diagram below an example of direct
The Internet is known as the set of networks connected by routers that are configured to pass traffic among any machine attached to any network in the set. By internet several
Problem: (a) What do you meant by Network Address Translation (NAT)? Why is it used? (b) Given the following information by your ISP about your newly acquired Frame Relay c
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