Comp 1 Revision Flashcards
Kerry is looking at two conputers; one has a single core processor and the other has a dual core processor.
Explain why having a dual core processor might improve thpe performance or the computer.
- Dual core means there are 2 processors (double)
- parallel processing can take place «_space;which means each processor can execute seperate instructions at the same time
^ enables multitasking
One computer has 64 kB of cache and the other has 512 kB of cache.
Explain how the cache size can affect the performance of the CPU.
- Cache stores frequently visited sites/ used instructions
^ that can be accessed faster than accessing them from main menory (RAM) - therefore, a greater cache improves the performance of the CPU
How bitmap Images are represented in binary?
- The image is split up into pixels
- Each pixel is given a binary code
^ which represents the colour of that pixel - Each colour is given a unique binary code
- Meta-data stored alongside the image
Explain why computers represent data in binary form?
- computers consist of logic gates/switches
^ which only have two values: honour off/1 or 0/open or closed
Describe one advantage and one disadvantage of using lossy compression on the image that will be used on the website.
- The file size is reduced therefore it is quicker to upload/download
- the quality of image is reduced because there are fewer colours/it is a lower resolution
Describe the similarities and differences between a switch and a router.
Similarities:
- they both connect devices
- They receive data from the devices
- They determine the correct correct destination for the data (e.g. they know where to send it)
- They transmit the data to its destination
Differences:
- A switch uses MAC addresses
- A router uses IPs
- router store the addresses of devices attached
- they both know where to send the data (destination), however, the router knows the most efficient/fastest path.
Explain how each of the following can contribute to the performance of a network:
1) wi-fi- frequency
2) Interference
3) Number of concurrent users
4) Type of network traffic
1)
- 5GHz frequency can carry more data per second than a 2.4 GHz frequency
- 5GHz frequency has a short range so access may be limited
2)
- Causes errors which means signals need re-transmitting which causes more traffic on the network (slower)
- Objects can block/limit the signal range
3)
- more traffic means the same bandwidth is split - therefore each user has less bandwidth and there is more traffic due to more data being sent
4)
- transmitting large files will take up more bandwidth than text files
Describe how packet switching can be used when sending data!
- Data is split into packets
- Each packet has a fixed size
- Each packet has a header ~ that includes the packet number/destination
- Packets are sent individually
- Package can be sent in different routes
- Receiving computer wait for all packets to then put them back in order (by packet number)
^ also request for missing packets
Describe how an analogue soundwave is converted into digital form.
- The process begins by the soundwave being sampled (in which the amplitude/height of the wave is measured at SET time intervals.
- each sample is stored as a binary number
- The binary number for each sample is stored sequentially.
Give benefits of compressing the data before it is emailed.
- reduces file size
- Takes less time to upload/download/transmit
- Requires less storage space
- Uses less bandwidth to transmit
Give two disadvantages to the company of storing their data in the Cloud.
- you need a constant Internet connection to access it in which lawyers who travel a lot may not always have.
- It is reliant on third-party for backup connection
- Data stored in the cloud will be vulnerable to hacking and other threats
- Data protection act^^
Give two benefits to the customers of Eve choosing an open source license.
- free of charge
- they can adapt it/add features/help improve the code
Give two benefits to Eve of choosing a proprietary license.
- she can charge customers (earn a profit)
- She can restrict what uses do (uses can’t edit it)
Identify some pieces of metadata that is often stored with an image.
- height
- Width
- Colour/bit depth
- Date
- File size
- File type
- Author
With regards to network protocols, define what is meant by a “layer”?
- A division of network functionality
(A layer is a sub-part of a more complex task)
