UCS does a great job of explaining it here:
How do I VPN into the University Network ?
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Monthly Archives: December 2012
Producing Pretty Graphs
My aim to reproduce Figure 1: Internet users and non-users by age group (years), 2012 Q3 from the Internet Access Quarterly Update, Q3 2012 from the Office for National Statistics. For this I will be using Octave
THE PLAN
1) Download data as xml and convert to csv
2) Read the data into Octave and check this it has been read in correctly
data = data = dlmread(“<my_file.csv>”,”,”);
size(data)
The expected output will be 8 4
3) Divide the date into the correct axis
x = data(:,1);
ya = data(:,2);
yb = data(:,3);
yc = data(:,4);
4) Plot the new data
plot(x,ya,”;Used within last 3 months;”,x,yb,”;Used more than 3 months ago;”,x,yc,”;Never used;”)
5) Label the x and y axis
xlabel(“Age Group(Years)”);
ylabel(“Percentage who have used the internet”);
6) Give the graph a title
title(“Internet users and non-users by age group (years), 2012 Q3”);
7) Output the graph and save
print(“test.pdf”,”-dpdf”);
Hierarchical MAC Addresses
I recall a supervision question last year along the lines of:
“Are the following addresses hierarchical or flat ?
a) Posrcodes
b) IP addresses
c) MAC addresses ”
Its well know that MAC addresses are flat but what if they where instead hierarchical ? This is the idea behind the MOOSE project by Malcolm Scott. Multi-level Origin-Organised Scalable Ethernet (MOOSE) is an Ethernet switch architecture that rewrites MAC addresses to impose a hierarchy upon the address space so switches no longer need to maintain a large forwarding database.
The context MOOSE is designed for is Ethernet within datacenters
Betteridge’s law of headlines
I dont have much to add here but the Wikipedia article is well worth a read http://en.wikipedia.org/wiki/Betteridge’s_law_of_headlines
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