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日期：2022-03-13 12:06

Assessed Coursework

Course Name Networked Systems (H)

Coursework Number Exercise 2

Deadline Time: 4:30pm Date: 18 March 2022

% Contribution to final

course mark

10%

Solo or Group ü Solo ü Group

Anticipated Hours 10

Submission Instructions Submit via Moodle

Please Note: This Coursework cannot be Re-Assessed

Code of Assessment Rules for Coursework Submission

Deadlines for the submission of coursework which is to be formally assessed will be published in course

documentation, and work which is submitted later than the deadline will be subject to penalty as set out below.

The primary grade and secondary band awarded for coursework which is submitted after the published deadline will

be calculated as follows:

(i) in respect of work submitted not more than five working days after the deadline

a. the work will be assessed in the usual way;

b. the primary grade and secondary band so determined will then be reduced by two secondary bands

for each working day (or part of a working day) the work was submitted late.

(ii) work submitted more than five working days after the deadline will be awarded Grade H.

Penalties for late submission of coursework will not be imposed if good cause is established for the late submission.

You should submit documents supporting good cause via MyCampus.

Penalty for non-adherence to Submission Instructions is 2 bands

You must complete an “Own Work” form via https://studentltc.dcs.gla.ac.uk/

for all coursework

Networked Systems (H) 2021-2022 – Exercise 2

Dr Colin Perkins, School of Computing Science, University of Glasgow

3 March 2022

Introduction

The material in lectures 8 and 9, and lab 5, of the Networked

Systems (H) course, review naming and network topology. This

assessed exercise, worth 10% of the marks for the course,

aims to further explore that material.

Assessed Exercise 2

This assessed exercise in based on the material in Laboratory

Exercise 5, on Naming and Network Topology. Complete that

lab exercise, as follows:

• Prepare a program, dnslookup.c, that can perform DNS

lookups and that runs on the stlinux machines in the lab.

• Lookup the IP addresses for popular sites using your

dnslookup program, use traceroute to find the paths

to those sites, and plot topology visualisations showing

those paths, for both IPv4 and IPv6 network paths. Save

the results as PDF files in router-topology-v4.pdf and

router-topology-v6.pdf.

• Prepare a report that discusses the specified points relating

to IP addresses, router-level topology maps, IPv4 and IPv6,

and the traceroute tool, and save it as report.pdf.

Submit these four files as described below.

Submission

Create a directory named ns-ex2-GUID, where GUID is replaced

by your GUID (your student number followed by the

first letter of your surname). Put copies of the following four

files into this directory: the source code for your dnslookup.c

program; the two PDF files, router-topology-v4.pdf and

router-topology-v6.pdf that contain your network topology

maps; and the PDF file of your report, report.pdf. Create a

zip archive of the directory, as a file called ns-ex2-GUID.zip.

Submit the zip archive via Moodle.

For example, if your GUID was 1234567a, you would perform

the following steps to create your zip archive:

mkdir ns-ex2-1234567a

cp dnslookup.c ns-ex2-1234567a/

cp router-topology-v4.pdf ns-ex2-1234567a/

cp router-topology-v6.pdf ns-ex2-1234567a/

cp report.pdf ns-ex2-1234567a/

zip -r ns-ex2-1234567a.zip ns-ex2-1234567a/

If you have prepared your archive correctly, then running

“unzip -lqq ns-ex2-GUID.zip” should produce output like

the following:

$ unzip -lqq ns-ex2-1234567a.zip

0 16-01-2022 22:54 ns-ex2-1234567a/

1359 16-01-2022 22:54 ns-ex2-1234567a/dnslookup.c

14315 16-01-2022 22:54 ns-ex2-1234567a/router-topology-v4.pdf

15354 16-01-2022 22:54 ns-ex2-1234567a/router-topology-v6.pdf

172851 16-01-2022 22:54 ns-ex2-1234567a/report.pdf

$

Check carefully that your zip archive extracts into the correct

subdirectory, and contains only the requested files.

Assessment and Marking Scheme

This is an assessed exercise, worth 10% of the marks for this

course. The deadline for submissions is 4:30pm on Friday 18

March 2022. The Code of Assessment allows late submission

up to 5 working days beyond this deadline, subject to a penalty

of 2 bands for each working day, or part thereof, the submission

is late. Submissions received more than 5 working days after

the due date will receive an H (band value of 0).

Submissions that are not made via Moodle, that have the

wrong filename, that have a zip archive that extracts into the

wrong directory or that contains the wrong files, or that otherwise

do not follow the submission instructions will be subject to a 2

band penalty. This is in addition to any late submission penalty.

Marks will be awarded as follows:

• [7 marks] for dnslookup.c, comprising [1 mark] for

compiling without errors or warnings using the command

clang -W -Wall dnslookup.c -o dnslookup

on the stlinux machines; and up to [6 marks] for correctly

looking up domain names and printing results.

• [4 marks] for router-topology-v4.pdf, comprising [2

marks] for readable formatting and [2 marks] for picking a

set of addresses that illustrate the network topology.

• [4 marks], similarly, for router-topology-v6.pdf.

• [15 marks] for report.pdf, comprising [4 marks] for

discussion of IP addresses, [4 marks] for discussion of

router-level topology maps, [2 marks] for discussion of IPv4

and IPv6, and [5 marks] for explanation of the traceroute

tool. Marks are assigned for reasoned, clearly explained,

and technically correct discussion of the points noted in

Part 3 of the lab 5 handout.

The result will be a numeric mark out of 30. This numeric

mark will be converted to a percentage, then the percentage will

be converted to a band on the 22-point University of Glasgow

scale using the standard translation table for the School of

Computing Science. Any applicable penalty for late submission

and/or for not following submission instructions will then be

applied, and a band will be returned. A brief written justification

for the band will also be supplied.

Copyright ©2022 University of Glasgow.

This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.

https://creativecommons.org/licenses/by-nd/4.0/

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