Gertrude contemplates that this is also true in the abstract kingdom of software and technology. Here, distinctly shaped machines, wires, plastic and metal have been labelled, aliased and branded. Untouched spaces, unseen procesess and unheard instructions have been honoured with what are now household names.
People of all ages adopt it rather willingly; learn new jargon, acquire new computer related hobbies and even use their extremities in hitherto unfamiliar finger acrobatics with varying degrees of skill.All good. Gertrude is fairly amiable to such activity. She was preoccupied all of last evening understanding three letters. www. Then she realised she must first understand the word Internet. The mass of cables that holds together people around the world with information at each end of the wires. The universe's electronic alter ego. Alter e-go, to be more catchy.
In the real world, people talk to one another over phone, by letters or in person. The internet is a lot like that. Each method of reaching out is roughly the equivalent of a network, Gertrude reasoned. So there is etiquette, rules and even tools involved in each of these networks. All of these networks, the cables, the satellites, the attached devices and the rules, make up the internet. Not surprisingly, the networks, the cables, the satellites, the attached devices and the rules - all have names.
Gertrude has heard people say web to mean the all of the internet. She would like to tell them that the (world wide) web is the name given to only one of its networks. The internals of the web, where people visit ebay or facebook, are different to the internals of the POP network where electronic letters are exchanged. Networks may cross each other's paths. Like when Gertrude uses the web to go to gmail and then it uses POP to send the emails to someone else. The web might still be the most frequently used network in the internet.
Within a network, each of its component has a name. The massive computers whirring away in the corners of cyberspace supplying the pages or masses of data are called servers. In increasing order of cleverness, the names of devices that direct the data to their homes are hubs, switches and routers. Cables made of copper wire, aluminium wires or even glass fibre carry the data. They are named twister pair, coaxial and optical fibre in that order. There are probably names for data-carrying invisible satellites in ether whose names Gertrude isn't sure of. She knows bluetooth can carry data wirelessly over a short distance.Data now arrives at the client computer that asked for the data. The computers who want to send or receive data from others of their species must have a special bone in their bodies called a network card. These network cards have a unique serial number called a MAC Address tattooed in them. Gertrude is fairly sure that the IEEE and the makers of the network cards who are responsible for this are not likely to run out of large numbers any time soon.
So people only need to remember the address of the search engine. The address is called a URL. Not even the most technical of her colleagues think of it as a universal resource locator. Humbug! Its a rather ambitious name.
An address proves that a computer exists in the network. This address is a number called an IP address. IP addresses are three dots surrounded by numbers. This is quite different to a MAC address which is physically inscribed inside the heart of a computer. The IP address is a concept. Fickle. Not as committed as a post code. Someone responsible invents this address.
Clients have IP addresses. Servers have IP addresses. The responsible person is a domain name registrar whose sole profession is devoted to naming or numbering. This person or organisation would need to be authorised by ICANN, a superior group of people who assign names and numbers.
Clients may have a different IP address each time they connect to a network. It would be rather inconvenient if servers did. So servers get given a fixed IP address. Trouble is, there may be many servers who provide data on the same thing say, google. What we know as google might actually be a colony of computers with different IP addresses cloaked under a more endearing name.To prove this, on her little old PC, Gertrude does Start > Run > CMD and then types: ping www.google.com. And she sees an IP address. Then she does the same thing a bit later. Sure enough, a different IP address appears.
So www.google.com is a domain name. The dot com is rather like a surname you cannot get rid of! The ICANN people have a list of close to 300 surnames for domain names which include country codes dot co dot uk and the old fashioned dot com, dot org and the like. It is exploiting Libya's and USA's country code that unorthodox names like bit.ly, and del.icio.us have flourished.
The surname is a top level domain name. Stuff to the left of it is called a second level domain name. Stuff to the left of that is the third level domain. This can go on for a hundred and twenty seven levels. A most remarkable prime number to be chosen. 127 is 20 + 21 + 22 + 23 + 24 + 25 + 26
A top level domain name usually won't usually be a physical computer on the network. It is only the second level onwards that there are actually computers available for entertainment. At this level and beyond, they are called hostnames.
Gertrude was just talking to Charlie yesterday who visited a place in Angelesey in North Wales to spend time in a caravan. The place is llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogochuchaf. Now thankfully, the ICANN people allow domain names at each level to be up to 63 letters. She wonders if 63 is 1 bit short of 8 bytes (8 times 8 bits is 64 bits is 8 bytes). with the one 1 bit reserved for something secretive. Or just plain superstition. However, in all, a domain name can be 253 letters long. Presumably, this includes the many dots and the surnames.
Gertrude has a carefully nurtured grouse against things like tinyurl.com and twitter, which force people to cram and zip these ornamental URLs into encrypted unsightliness causing people to get afraid of them and ban shrunken URLs and for other people to invent things like untiny.com to unshrink the URLs.
