From now on I might have some question regarding computer science for my course, that I will write here, it will be one thread instead of many threads.
Dont worry it will not be a copy past issue, after doing research on internet, I didn’t find some right answers so that I might write here, so please help if possible. I am sure some intelligent ppl will help me poor soul out.
So my first question is; when going to** properties**, after saving a document, they give two accounts, one is size, other size on disk and one offered by windows explorer, each is different from the other.
Why is this ? I would say, “size” is the size of the document, “size on disk”, size of document plus size of the program, eg. words together and the one on “windows explorer”, just sums up “size” to the next KB. Right?
When you save a file it gets stored on “clusters” on the hard drive. The cluster size depends on what file system the drive is formatted with. So for instance let’s say the cluster size is 4 kb and the file size is 5 kb, its going to use one cluster totally but still has 1 kb left, so then it takes over the whole of the next cluster. Hence taking up 8 kb. That’s what it means when it says file size is 5 kb but size on disk is 8 kb.
Thank you Tofibaba, I am still trying to digest the piece of information u gave.
Hmm I think I got it.
What about the size of document seen on windows explorer, its totally different there ?
Q2 I know what Bridges, Hubs, Routers are, where as Switches are essentially multi-port bridges, how am I to understand this statment?
Thank you Tofibaba, I am still trying to digest the piece of information u gave.
Hmm I think I got it.
What about the size of document seen on windows explorer, its totally different there ?
Well, Explorer rounds off KB, MB and GB. For instance 1 MB actually equals 1024 kb, 2 gb actually equals 2048 MB.
Q2 I know what Bridges, Hubs, Routers are, where as Switches are essentially multi-port bridges, how am I to understand this statment?
Switches are not bridges (in the true sense), they are just glorified, intelligent hubs (if I may exaggerate a bit). With hubs (dumb devices) the network packets are "broadcasted" to all ports on the hub, when the true recipient sees that broadcast it hollers back that it is at this port, and receives the packet. That "holler" is also broadcasted to all the ports on the hub including the original sender. If 2 of the ports receive packets at the exact same time time there's a collision and all data is lost.
On the other hand (on a switch) once a device is connected to the Switch it records the mac address and knows when a packet intended for a specific MAC. Hence there is no collision so no data loss. That's the difference in the most general terms I could come up with.
Hello I am stuck again, cannot seen to find info in the intermet.
This time its about LAN, suppose we'd wanted to extend our LAN to huge size
like some kilometers, is it possible if the LAN is a.) Token ring LAN b.) Ethernet LAN ?
I would say yes, of course we'd need bridges, switches, hubs and routers to connect the segments to eachother. For Token ring I think it would be a bit difficult to implement.
Or actually extending the LAN to several kilometers makes it into a WAN, so it cannot be called a LAN anymore. Please do give me a reference if you have so.
The difference between a LAN and WAN is that WAN is formed when you use the public services, like a Frame Relay or ATM connection and it needs a router to connect different LAN’s together. You can extend the LAN either using repeaters etc or using fibre. There’s another kind of network called MAN. You can read about all the different kinds of area networks at this url: http://compnetworking.about.com/od/basicnetworkingconcepts/a/network_types.htm
Here’s the info on topology. I don’t think I can explain it better than that:
