|
RAM
|
Cache Memory
|
|
Fast read and write access
|
Faster read and write access
|
|
Volatile
|
Volatire
|
|
Used to store data and currently running programs
|
Used to store frequently used data
|
|
Necessary as most data is stored on slower storage media
|
Resides close to CPU
|
|
SSD uses direct access, so there woudl be no improvement in read times
|
|
May perform "trim" command which imrpoves speed of write operations
|
|
SSD uses NAND based flash memory. Defragmentation may shorten its lifespan.
|
|
FTP
|
UDP
|
|
Breaks data into packets
|
Breaks data into packets
|
|
Can re-send dropped or damaged packets
|
Does not re-send dropped or damaged packets
|
|
Packets can be re-assembled if they arrive out of order
|
|
|
FTP not useful for streaming media, as receiving new packets is more important than receiving old ones
|
UDP useful for streaming media, as receiving new packets is more useful than receiving old ones
|
|
Integer
|
Floating Point
|
|
Numbers are stored accurately
|
Non-integers can be stored
|
|
Requires less complex processing
|
Greater range of numbers can be stored
|
|
Allows for exact representation of 0
|
|
|
Takes up less storage space
|
|
|
Clock
Manages Fetch/Decode/Execute cycle
|
|
ALU
Processes data involving arithmetic and logical operations
|
|
Registers
A small/fast/temporary storage addressed by mechanisms other than main memory
|
|
Buses
Connects all internal components of a computer
|
|
Cache Memory
Fast, easily accessed memory close to the CPU.
|
|
If one cable breaks, network will still operate.
|
|
Faults are easy to detect.
|
|
Data has to pass through hub, so it is very secure.
|
|
Easy to add new stations.
|
|
Exchange of signals between devices to establish readiness to communicate
|
|
Example: Establishing a printer's readiness to print
|
|
Data split into packets
|
|
Each packet can be transmitted on different routes
|
|
Packets may arrive out of order
|
|
More secure than circuit switching
|
|
Makes more efficient use of data lines
|
|
Contains source address, order number of packet and parity bit.
|
|
External HDD
Fast data transfer
Cost-effective cost per unit of storage Portable and can be stored securely |
|
Third party storage provider
Fast transfer(depending on network speed)
Could be more expensive than HDD due to company fees Data is stored securely |
|
Flash memory drive
Very fast access
Cost effective cost per unit of storage Very portable |
|
Magnetic tape
Can have very slow access speed
Allows for very large amounts of storage |
|
HTTP
Transferring multimedia web pages over the Internet
|
|
DHCP
Assigning dynamic IP addresses to devices on a network.
|
|
Simplex
In one direction only
|
|
Half-Duplex
In both directions, but not simultaneously
|
|
Duplex
In both directions simultaneously
|
|
Physical location of a piece of data is calculated using a hashing algorithm
|
|
Calculation is carried out on the primary key
|
|
Data collision occurs when two items are hashed to the same location
|
|
In this case, the data is sent to the overflow area.
|
|
When there are many hash collisions, access to the overflow area may be slow
|
|
A new hashing algorithm is required and a larger file may be needed.
|
No comments yet.
Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
