1. How many Kilobytes in a Megabyte?
1000KB
2. How many Kilobytes in a Gigabyte?
1000000KB
3. How many Megs in 4 Terabytes?
4000000MB
4. How many bits in an Yotta?
9.671406556917033e+24MB yeah...
5. Tell me what base 10, base 2 and base 16 are?
7. Tell me where Hexadecimal is used and why?
8. Extension: Write a very simple python program that works out bits/bytes or that converts binary to denary or that converts hex
Wednesday, 6 May 2015
Wednesday, 11 March 2015
xX_The_6_Marker_Xx
A Domain Name Server maintains a directory of domain names and translates them into IP addresses because computers require the IPS to access websites.
DNS servers can be DDoS'd which is a disadvantage because the user may not be able to access the website if its being DDoS'd.
The user benefits from the DNS server because they don't have to remember the IP address to access the website so instead they can remember a simple url to help them get directed to their desired website.
DNS servers can be DDoS'd which is a disadvantage because the user may not be able to access the website if its being DDoS'd.
The user benefits from the DNS server because they don't have to remember the IP address to access the website so instead they can remember a simple url to help them get directed to their desired website.
Wednesday, 4 February 2015
Printing users input
First line is printing Hello World, and then the second is printing to ask for the users name, and then the third line allows the user to input their name labelling the input as name, and lastly the fourth line is printing hello, and then adding the name to the hello, for example:
Creating New Lines
The \n allows the user to create a new line to put their text on instead of having everything on one long line. The output I got was:
Thursday, 12 June 2014
A451 Databases
A Database is a structured set of data held in a computer, especially one that is accessible in various ways.
What is a Db?
Give example of a serial file Db
Give example of a sequential Db
Talk about 3 levels of a Db view
The external view
The conceptual view
The physical view
What is a Flat file Db?
What is a hierarchical Db?
The data in the picture could be what the database is used for and what it stores.
A database records strings of information on what to do when data is input and decides where to put it and stores it to the file showing information attached.
You gain information for the collected data.
If a phone company had to take the customers name, number, address, and email the database will record it so next time when the customer calls back you can just look through the database and find their personal file of information and you can record even more information against their file and adding notes of their bills and what they have bought as their service.
Sequence databases can be searched using a variety of methods. The most common usage is probably searching for sequences similar to a certain target protein or gene whose sequence is already known to the user. A flat file database describes any of various means to encode a database model (most commonly a table) as a single file. A hierarchical database is a management system that links records together so that each record has only one owner. It represents information in a one to many relationship, e.g. parent may have more than one child but each child can only have one parent. They were used widely in the first mainframes but can not be used often as they do not relate to the structures in the real world.
Give example of a serial file Db
Give example of a sequential Db
Talk about 3 levels of a Db view
The external view
The conceptual view
The physical view
What is a Flat file Db?
What is a hierarchical Db?
The data in the picture could be what the database is used for and what it stores.
A database records strings of information on what to do when data is input and decides where to put it and stores it to the file showing information attached.
You gain information for the collected data.
If a phone company had to take the customers name, number, address, and email the database will record it so next time when the customer calls back you can just look through the database and find their personal file of information and you can record even more information against their file and adding notes of their bills and what they have bought as their service.
Sequence databases can be searched using a variety of methods. The most common usage is probably searching for sequences similar to a certain target protein or gene whose sequence is already known to the user. A flat file database describes any of various means to encode a database model (most commonly a table) as a single file. A hierarchical database is a management system that links records together so that each record has only one owner. It represents information in a one to many relationship, e.g. parent may have more than one child but each child can only have one parent. They were used widely in the first mainframes but can not be used often as they do not relate to the structures in the real world.
Thursday, 5 June 2014
Network Topology
Star topology goes across the line and then chooses the direction to where to go to send the information
A star topology involves using a central device, such as a switch, as the connection point for all systems. The advantage of a star topology is that a break in the line affects only the system connected to that cable.
Bus topology slows down when heavy traffic and there is lots of data collisions.
A bus topology consists of a main cable (known as a trunk) that all systems connect to. There are terminators at each end designed to absorb the electrical signal off the network. If there were no terminators, the signal would bounce back and collide with other data on the cable. One of the disadvantages of a bus topology is that if there is a break in the trunk, the entire network fails.
In a ring topology, hosts are connected to each other forming a large circle. In a single-ring topology, all of the device on the network share a single cable. The disadvantages of a single-ring topology are that data only travels in one direction, and if there is a break in the ring, the entire network will go down. In a dual-ring topology, there are 2-rings made from separate cables. This allows data to be sent in both directions and introduces fault tolerance as there would need to be a break in both lines to cause the network to go down.
A star topology involves using a central device, such as a switch, as the connection point for all systems. The advantage of a star topology is that a break in the line affects only the system connected to that cable.
Bus topology slows down when heavy traffic and there is lots of data collisions.
A bus topology consists of a main cable (known as a trunk) that all systems connect to. There are terminators at each end designed to absorb the electrical signal off the network. If there were no terminators, the signal would bounce back and collide with other data on the cable. One of the disadvantages of a bus topology is that if there is a break in the trunk, the entire network fails.
In a ring topology, hosts are connected to each other forming a large circle. In a single-ring topology, all of the device on the network share a single cable. The disadvantages of a single-ring topology are that data only travels in one direction, and if there is a break in the ring, the entire network will go down. In a dual-ring topology, there are 2-rings made from separate cables. This allows data to be sent in both directions and introduces fault tolerance as there would need to be a break in both lines to cause the network to go down.
Thursday, 3 April 2014
Chapter 6 Network
LAN: (Local area network)
Advantages:
If your network is behind a good Firewall then it makes attacks much more difficult
A LAN allows more than one device to share information between each other like in a office if you had 5 computers and one printer all of the computer would be able to print to the same printer.
Disadvantages:
Every time you add a new device you'll need to add more wires
For only wireless devices like phones you wont be able to access the internet with it
NIC:
NIC is also known as a Network interface controller
The controller implements the electronics to communicate with each other
HUB:
Advantages:
If your network is behind a good Firewall then it makes attacks much more difficult
A LAN allows more than one device to share information between each other like in a office if you had 5 computers and one printer all of the computer would be able to print to the same printer.
Disadvantages:
Every time you add a new device you'll need to add more wires
For only wireless devices like phones you wont be able to access the internet with it
NIC:
NIC is also known as a Network interface controller
The controller implements the electronics to communicate with each other
HUB:
Subscribe to:
Posts (Atom)