Question 1

Broadband is defined as simply fast internet rather than as wide bandwidth, and gets confused with bandwidth itself, the frequency range or data capacity of a channel.

Accepted Answer

Keep the two separate. Bandwidth is the capacity of a single channel. Broadband is a wide bandwidth transmission method that carries multiple channels or a high data rate at once.

Question 2

CRC error detection is described as just checking the data, without the mechanical steps, dividing by a fixed polynomial to generate a remainder, sending that remainder as a checksum, and recalculating it at the destination to compare.

Accepted Answer

Write the process as a sequence: the sender divides the data by a fixed number to get a remainder, sends that remainder alongside the data, and the receiver repeats the division and compares its remainder to the one received.

Question 3

Relational database normalisation, 1NF through 3NF, is completed without underlining primary keys or marking foreign keys at each stage.

Accepted Answer

Underline every primary key and clearly mark every foreign key in every intermediate table you draw, not just the final 3NF answer. The notation is assessed at each stage, not only the end result.

Question 4

Legislation questions give a general ethical opinion instead of naming the specific statutory offence, for example under Sections 1, 2 or 3 of the Computer Misuse Act.

Accepted Answer

Learn what each section actually covers: Section 1 is unauthorised access, Section 2 is unauthorised access with intent to commit a further offence, Section 3 is unauthorised modification. Name the section that matches the scenario.

Question 5

SQL answers omit quotation marks around text literals, use INSERT INTO syntax inside an UPDATE statement, or leave out the WHERE clause on a DELETE command.

Accepted Answer

Quote every text literal, use UPDATE table SET field = value WHERE condition, and never write a DELETE statement without a WHERE clause unless the question specifically asks you to clear the whole table.

Question 6

6 mark QWC questions discuss only the benefits of a technology, cloud storage or a star topology, for example, without analysing the drawbacks or vulnerabilities on the other side.

Accepted Answer

Plan both sides before writing. State the advantage, then the corresponding risk or limitation, for every point you raise, so the answer reads as an evaluation rather than a one-sided description.

Question 7

Parity bits are assumed to detect every transmission error, when in fact an even number of flipped bits leaves the parity unchanged and goes undetected.

Accepted Answer

State the limitation explicitly when asked to evaluate parity checking: it detects an odd number of bit errors but misses an even number, which is why stronger methods such as CRC are used alongside or instead of it.

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