TCP/ ip, Computer Network Security

Assignment Help:
Q1 (15 marks, 5 marks each part):
This question has three parts:

In a short paragraph (200-300 words) explain the fundamentals of Packet Switching and how it works.
In a short paragraph (200-300 words) explain the fundamentals of Circuit Switching and how it works.
Using your own words, in a short paragraph (200-300 words) discuss and explain why packet switched networks are used for data communication instead of circuit switched.

Q2 (30 marks, 10 marks each group)
An ISP is granted a block of addresses starting with 110.50.0.0/16. The ISP needs to distribute these blocks to 2600 customers in the following three groups:

The first group has 200 medium-size businesses; each needs approximately 120 addresses.
The second group has 400 small-size businesses; each needs approximately 20 addresses.
The third group has 2000 households; each needs 6 addresses.
Design the sub blocks and give the slash notation for each sub block. Find out how many addresses are still available after these allocations. You need to show your working and math and explain how your achieved your sub-netting solutions. Write your subnets in a table like the following.

Group Number of Businesses Users per business Subnet (---.---.---.--- / ---) Number of remained usable addresses in the subnet
1 200 120
2 400 20
3 2000 6


Q3 (15 marks, 5 marks each question)
Using this diagram, answer the following routing questions:



A packet arrived at router R1-m2 with destination address 145.80.23.14. Explain how it is forwarded to its destination.
A packet arrived at router R2-m0 with destination address 170.14.24.12. Explain how it is forwarded to its destination.
A packet arrived at router R3-m0 with destination address 135.15.42.18. Explain how it is forwarded to its destination.
Q4 (28 marks, 14 marks each part)
A router with IP address 132.145.132.112 and Ethernet physical address of a1:a2:a3:a4:a5:a6 has received a packet for a host destination with IP address 152.111.178.110. The router does not know about the Ethernet physical address of the host. Assume the Ethernet address of the destination host is b1:b2:b3:b4:b5:b6 and the router is going to find it through and ARP request.

Show the entries in the ARP request packet sent by the router. Encapsulate this packet in a data link frame and fill all the fields.
Show the entries of the ARP packet sent in response to the packet in first part. Encapsulate this packet in a data link frame and fill all the fields.
Hint: Use example 8.1 as a template to explain your answer. Use the same drawing tradition to show your packets.


Q5 (12 marks, 4 marks each)
This question has three parts:

In a short paragraph (200-300 words), explain ICMP and why it is important.
In a short paragraph (200-300 words) explain “ping” and “traceroute” in UNIX --or “tracert” in Windows--, how they work and how they are different.
Show two screenshots of using ping and traceroure/tracert to address www.csu.edu.au. Pay attention to the delays and try to explain them.

Related Discussions:- TCP/ ip

Benchmarking-information security, Benchmarking An alternative approach to...

Benchmarking An alternative approach to risk management is Benchmarking. It is process of seeking out and studying practices in other organizations which one’s own organization de

Social network development in java , Social Network development in Java: ...

Social Network development in Java: Project Title: SUGGESTLOCAL (Nov 2006-April 2007) Role             : Developer Domain        : Social Network Client          :

Spambot detection - spam mail, Spambot Detection: The  previous studie...

Spambot Detection: The  previous studies in this field  have focused on content and meta-content based features.  The main assumption in this area of spam detection of late is

How to create a security policy, Five years ago, Calgary Kids' Cloth Ltd wa...

Five years ago, Calgary Kids' Cloth Ltd was just a small retail store in downtown Calgary. The company started their own factory in SE Calgary to produce outdoor clothes for kids.

Non-repudiation and auditing, Proof that the sender forwards the message. I...

Proof that the sender forwards the message. It also prohibits the author of the code from falsely denying that he forward the message. This is achieved by record using the exact ti

Operation of the signature based intrusion detection system, Question : ...

Question : (a) State whether the following statement is FALSE or TRUE: It is always better to have various access points to the Internet so that if a hacker takes one down you

Understanding a business model of a spammer, The first and foremost need of...

The first and foremost need of  any business is a role to perform for its client base, and for the spammer this will typically be the role of advertising products which, due to the

Digital signature, A digital signature is a stamp on the data, which is uni...

A digital signature is a stamp on the data, which is unique and very hard to forge.  A digital signature has 2 steps and creates 2 things from the security perspective. STEP 1

Develop firewall rules based on a fictitious organisation, Question requir...

Question requires you to develop firewall rules based on a fictitious organisation. Scenario: You work for a security-conscious company, xC-Cure, who develop encryption te

Network protocol hierarchy , This assignment aims to enhance students' unde...

This assignment aims to enhance students' understanding of the network protocol hierarchy and flow control and error control techniques by implementing a sliding window protocol in

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd