December 31st, 2020

​Distinguish between the following  pairs of terms

(i) Data verification and data validation
Data Validation

• Consistency and integrity of data e.g. if input field is numeric then it must only receive numerals. Anything else is considered invalid

Data verification

• Ensuring that data entered is the same as in the source documents

​(ii) Data Encryption and passwords
Encryption

• Encoding a message using a secret key called a cipher. For one to be able to read the message, they must understand how to decrypt it using the cipher.

Password

• A secret combination of characters (numbers/ letters), used to prove the identity of a person attempting to gain access to a computer system. Normally supplied with a username, Should be kept secret.

(iii) Dry run and walk through
Dry run

• testing done on a program by simulating its execution by a manual pencil and paper exercise

Walk through

• testing done by inviting other experts to review a program, system or project.

(b) Draw a labeled diagram to illustrate the internal structure of a diskette  (4mks)

​(c) Give two differences between post office mail and electronic mail (E- Mail) (2mks)

Post office Mail

• Expensive compared to email since  stationery, stamps and transport costs incurred 
• Slow to reach recipient
• Not easy to forward message to dispersed users

Email

• Costs less to send
• Message sent to users across a computer network
• Message can contain attachment files (WP, Spreadsheets, Graphics etc)
• Recipient can forward  message to other user quickly and efficiently
• Recipient can retrieve  information from any location across  the computer network

​(d) Speed and accuracy are some of the advantages of using computers in banking. State three other advantages of use of computers in banking. (3mks)

• Massive storage capacity
• Electronic funds transfer
• Processing of cheques using MICR technology
• Provision of ATM services

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