Defensive Design

Question 1

What does a data validation routine do?

Answer 1

Ensures that the data entered is of the correct range, type, length, format and that it is present

Question 2

What are the 5 main data validation checks?

Answer 2

Range check
Type check
Length check
Presence check
Format check

Question 3

What does a range check do?

Answer 3

Checks that a number/ date is within a sensible range

Question 4

What does a type check do?

Answer 4

Checks if the data is of the correct type

Question 5

What does a length check do?

Answer 5

Checks that the data entered is of the correct length

Question 6

What does a presence check do?

Answer 6

Checks that the field has not been left blank

Question 7

What does a format check do?

Answer 7

Checks that the data entered is of the correct format

Question 8

Define anticipating misuse

Answer 8

Always thinking of preventing hackers

Question 9

Describe Network Protocols

Answer 9

For any communication, data has to be transmitted. For this to happen there must be rules in place. These rules are called network protocols.

Question 10

What does HTTP stand for?

Answer 10

Hyper Text Transfer Protocol

Question 11

What is HTTP used for?

Answer 11

Sending and receiving webpages

Question 12

What is HTTPs?

Answer 12

A more secure version of HTTP

Question 13

What makes HTTPs more secure?

Answer 13

The webpages are encrypted

Question 14

What does FTP stand for?

Answer 14

File Transfer Protocol

Question 15

What does FTP do?

Answer 15

Transfers files between clients and servers

Question 16

What does POP stand for?

Answer 16

Post Office Protocol

Question 17

What does SMTP stand for?

Answer 17

Simple Mail Transfer Protocol

Question 18

What does IMAP stand for?

Answer 18

Internet Message Access Protocol

Question 19

What does POP do?

Answer 19

Receives emails and deletes them once they are downloaded

Question 20

What does IMAP do?

Answer 20

Receives emails but doesn’t delete them

Question 21

What does SMTP do?

Answer 21

Sends emails from clients or between servers

Question 22

What does the TCP do to send data over networks?

Answer 22

• Divides the message into smaller parts called packets
• Adds a sequence number so it can be reassembled
• Adds error correction information so errors can be found and fixed

Question 23

What does the TCP do to receive data over networks?

Answer 23

• Examines each packet for errors
• Fixes errors
• Requests missing packets to be resent
• Reassembles the message using sequence numbers

Question 24

What does the IP do to sent packets over networks?

Answer 24

• Adds the destination address to each packet
• Adds it’s own address (source address) to indicate where the packet originated from