Exam questions Flashcards
Explain what is meant by a MAC address (4)
Four from:
- Media Access Control (address)
- Used to identify a device
- It is a unique (address)
- It is a static address / It does not change
- It is set by the manufacturer
- The first part is the manufacturer ID/number/identifies the manufacturer
- The second part is the serial number/ID
Where can hexadecimal be used?
- MAC addresses
- Colour codes / colours in HTML / CSS
- Error messages
- Locations in memory
- Memory dump / debugging
- IP address
- ASCII / Unicode
- Assembly language
- URL
Name two components which use parallel transmission to send and receive data. Why is it safe for them to use parallel transmission?
- RAM, ROM, Registers (MAR, ALU, etc.)
- It is safe because it is over a short distance
How many bits are transmitted in parallel in a single clock cycle on a high-end laptop today?
64 bits
What transmission properties does a USB have?
- serial
- full duplex or half duplex
The company uses parallel half-duplex data transmission to transmit the data for the new videos to the web server.
Explain why parallel half-duplex data transmission is the most appropriate method.
- it has a header
- … that contains the destination address
- … that contains the packet number
- … that contains the originator’s address
- it has a payload
- it has a trailer
Describe the purpose of the control unit (CU) within the computer
- It sends control signals
- … that manage the transfer of data and instructions within the CPU
- It decodes an instruction
- … using an instruction set
The computer has a single core CPU
State one purpose of a core in a CPU
- to process an instruction
- to carry out a fetch-execute cycle.
The computer is upgraded to a dual core CPU
Explain how the upgrade can affect the performance of the computer
- It can now process two instructions simultaneously (where suitable)
- … increasing the performance.
