mocks dont know Flashcards
2 benefits of BCD
- easy to convert to denary - so less complex to decide
- easy for digital equipment to use BCD to display outputs
- can represent monetary values exactly
describe the function of a WNIC
- provides and interface to a wireless network - as an antenna
- recieved analogue and converts to binary and vice versa
- checks transmissions of the correct MAC address - ignores others
- encrypts/ decrypts data
what is meant by ethernet
- a protocol
- for data transmission over cables
- uses Carrier Sense Multiple Access/ Collision Detection
- data is transmitted in frames
- each frame has a source and destination address and error checking
mesh topology
- all comps connected another device
- multiple routes between devices
- comps act as relays
public vs private cloud
public
- services offered by a third-party provider over the public Internet
- Open to anyone
private
- Services offered either over the Internet or a private network
- Only available to select users
- It’s a dedicated system only accessible for an organisation
role and function of a router
- receives packets from devices
- Find the destination using the IP address
- forwards packets to that destination
- Find most efficient path
- Act as a gateway
- acts as a firewall
advantages of DRAM
costs less
higher storage density
simple design
how does memory management organise and allocate RAM
- RAM is assigned in blocks
- dynamic allocation of RAM to programs
- Reclaims unused blocks
- Prevent overwriting
- Manages segmentation and virtual memory
instruction groups in assembly language
data movement
input / output
arithmetic operations
2 signals transferred on the control bus
- interrupt
- timing
- read/ write
how do the CU system clock and control bus operate to transfer data
- clock gives out timing signals
- send along control bus
- to synchronise components
- CU initiates data transfer
- by generating signals that are send via control bus
purpose of the CU
- to coordinate actions of other components
- to send / recieve control signals along the control bus
- to manage execution of instructions
- controls communications between CPU components
causes of software interrupt
/0
array index out of bounds
how the OS manages hardware devices
- installs drivers - to allow communication
- sends data to and from devices
- handles buffers - to ensure amooth transfer if transmit at different speeds
- managed interrupts
how is data transmitted through USB
1 bit at a time
can by synchronous or asynchronous
USB3 is full duplex - earlier are half duplex
how does the OS manage processes
- manages scheduling
- manages resources required eg allocating memory
- enables data sharing between processes
- resolves conflicts
- handles the queue
- allow multitasking - by handling priority and interrupts
