OCR A Level Computer Science (H446)

1.3 Exchanging Data: revision quiz and key terms

Free practice for 1.3 Exchanging Data in OCR A Level Computer Science (H446). It has 4 parts: 1.3.1 Compression, Encryption and Hashing, 1.3.2 Databases, 1.3.3 Networks and 1.3.4 Web Technologies. Try the questions, then check the key terms.

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Question 1 · Multiple choice

Which database normal form requires that there are no non-key attributes dependent on other non-key attributes?

Question 2 · True or false?

Lossless compression reduces file size without permanently losing any data.

Question 3 · Multiple choice

What is the main difference between symmetric and asymmetric encryption?

Question 4 · True or false?

A hash function can easily be reversed to recover the original data.

Question 5 · Multiple choice

Which layer of the TCP/IP stack is responsible for routing packets between networks?

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Key terms for 1.3 Exchanging Data

CREATE TABLE
Defines a new table and its fields.
Data compression
Reduces file size to save storage space or reduce transmission time.
First Normal Form
Each field contains only a single, indivisible value.
Flat file database
Stores all data in a single table, which can lead to data redundancy.
PageRank
Ranks pages partly based on the number and quality of pages linking to them.
Run length encoding
Replaces sequences of repeated values with a single value and a count.
Socket
A combination of an IP address and a port number identifying a connection.

What 1.3 Exchanging Data covers

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