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netwirkassiaghmenCEN, Assignments of Scenography

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King Saud University
CCIS- SWE Dept.- Spring 2021
[CEN303]
Assignment#3 Due Date: Tuesday (6-Apr-2021) @ 11:59 pm
Page 1 of 4
ASSIGNMENT GUIDLINES
Submission:
The homework should be submitted as softcopy via LMS on the specified date and time. No late
submission will be accepted.
Document Formatting:
- You should answer all the assignments question in proper English, well-formatted document and
submitted with a cover page.
- Handwritten answers will not be accepted.
- The cover sheet should contain the following information:
Student name
Student ID
Homework Number
Page Number
Cheating:
Answer all questions by yourself with your own words. Cheating is not tolerated in any cases. The
assignment will be marked with minus points if it is copied from somewhere else (it will be easily
detected; we have a software for that).
Referencing:
Since you might use some references, you should add the references at the end of your document. The
references will be written in IEEE style. Search for it!
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CCIS- SWE Dept.- Spring 2021 [CEN303] Assignment# 3 Due Date: Tuesday ( 6 - Apr-2021) @ 11 : 59 pm ASSIGNMENT GUIDLINES Submission: The homework should be submitted as softcopy via LMS on the specified date and time. No late submission will be accepted. Document Formatting:

- You should answer all the assignments question in proper English, well-formatted document and submitted with a cover page.

  • Handwritten answers will not be accepted.
  • The cover sheet should contain the following information:
  • Student name
  • Student ID
  • Homework Number
  • Page Number Cheating: Answer all questions by yourself with your own words. Cheating is not tolerated in any cases. The assignment will be marked with minus points if it is copied from somewhere else (it will be easily detected; we have a software for that). Referencing: Since you might use some references, you should add the references at the end of your document. The references will be written in IEEE style. Search for it!

CCIS- SWE Dept.- Spring 2021 [CEN303] Assignment# 3 Due Date: Tuesday ( 6 - Apr-2021) @ 11 : 59 pm

Problem 1:

Consider a scenario with two hosts, Hind and Sarah. A web server running on Hind's device is trying to send data to a browser on Sarah’s device. For each TCP connection, Hind has a buffer of 512 bytes and Sarah has a buffer of 1024 bytes. Assume TCP sequence numbers began at 0. A. Sarah received up to byte 560 in order from Hind, although her browser has only read and delivered up to the first 60 bytes. What will be the ACK and receiving window size in the TCP headers that Sarah next sends to Hind? B. Later in the same connection, Hind’s congestion window is set to 1 MSS= 536 bytes and the advertised flow-control window from Sarah is 560 bytes. The last ACK that hind received from Sarah is byte 700, and the last byte that Hind sends to Sarah is byte 900. B.1 What is the last byte number that Sarah can accept from Hind? B.2 Assuming that Hind does not receive any more ACKs and her window does not change, what is the greatest byte number that Hind can send? B.3 Again assuming that Hind does not receive any additional ACKs from Sarah, how many more bytes can the web server running on Hind's device write to its network socket before blocking?

Problem 2 :

Plot two diagrams that show the TCP congestion window for Taho and Reno mechanisms if the initial threshold is set to 14. Consider the occurrence of two loss events:

  • A timeout is triggered just after transmission round #7.
  • A 3 duplicated ACKs are received just after transmission round #11. Please show the threshold in your plotting.

CCIS- SWE Dept.- Spring 2021 [CEN303] Assignment# 3 Due Date: Tuesday ( 6 - Apr-2021) @ 11 : 59 pm 6 7 Node Distance A B C D E F H