ITEC647 Data Communications Assignment

1, 2018 Semester 2
Due: Thursday 25th October, 2018, 6 pm Impressions: 60 Value: 15%
• Pledge
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Please do referable enfold intervenience verses.
Assignments succeed be referableable and returned online. There are no hardcopy resignations restraint written ordinances.
1. TCP (20 impressions)
Host A and B are communicating aggravate a TCP association, and Host B has already running from A integral bytes up to byte 126. Suppose Host A then sends brace limbs to Host B back-to-back. The leading and prevent limbs comprise 80 and 40 bytes of axioms, respectively. In the leading limb, the appoint reckon is 127, the origin mien reckon is 3024, and the goal mien reckon is 80. Host B sends an acknowledgement whenever it entertains a limb from Host A.
b. (4 impressions) In the prevent limb sent from Host A to B, what are the appoint reckon, origin mien reckon, and goal mien reckon?
c. (4 impressions) If the leading limb attains antecedently the prevent limb, in the acknowledgement of the leading arriving limb, what is the acknowledgement reckon, the origin mien reckon, and the goal mien reckon?
d. (4 impressions) If the prevent limb attains antecedently the leading limb, in the acknowledgement of the leading arriving limb, what is the acknowledgement reckon?
e. (8 impressions) Suppose the brace limbs sent by A attain in appoint at B. B sends acknowledgements restraint twain limbs, referablewithstanding the leading acknowledgement is past and the prevent acknowledgement attains behind the leading opportunityout cessation. Draw a timing diagram semblanceing these limbs and integral other limbs and acknowledgements sent (you can presume no other limb waste). Restraint each limb in your diagram, supply the appoint reckon and the reckon of bytes of axioms; restraint each acknowledgement that you subjoin, semblance the acknowledgement reckon.
2.Pledge (15 impressions)
Review Kerckhoff’s six principles of pur-pose restraint pledge. Explain these in the tenor of present electronic communications. How are they quiescent bearing and applied today.
3.Pledge (10 impressions)
What are steganography and cryptography in instruction pledge? How are these contrariant? Can they be authenticationd conjointly and if so how?
4.Backbspecial Networks (15 impressions)
You bear been compensated as a netachievement consultant by an enlightened guild determined Soylent Foods. Your labor is to praise an lovely elucidation to supmien their insufficiencys and to subjoinress their running problems. The IT supervisor of Soylent Foods wants you to be knhave of the restraintthcoming facts:
• The restraintm has 3 provinces. Integral subjoinressing is dspecial using IP.
• Key servers are runningly randomly placed in contrariant provinces. So a authenticationr in special province X peruses and transcribes to rasp servers in another province Y. Similarly, authenticationrs in provinces X and Y would perauthentication mails from a server in province Z.
• The commerce and unsparingly storms originating in special province is causing bandwidth saturation in other provinces.
• The kernel of the netachievement is lingering and is incapable to acee the counterpart opportunity requirements of different discriminating office applications.
Propose salubrious elucidations with sufficient maintenance. In feature, in your praiseation you insufficiency to recommobject the restraintthcoming:
a) Kernel technology pur-pose.
b) Specific LAN technologies to be authenticationd in each province.
c) Specific pur-pose elucidations to subjoinress inter-departmental commerce issues. ((600 say)
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Correctness of adit
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Multi-paragraph answers should be structured into sections and subsections with embezzle headings and subheadings.
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Spelling and rhetoric
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Choose a bibliography phraseology and authentication it gratefully.
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