Why is parity checking important

To ensure data was received correctly.

Define strong password policies.

Must use letters, numbers & symbols
Must be more than 10 characters
Avoid using names or simple words
Change passwords regularly

What is biometric security

Security that uses fingerprints, facial recognition, or iris scans

Explain the purpose of 2FA

Add an extra layer of security

❓ Question:

You received the following 8-bit data packet:

CopyEdit11010111

Assume that parity is EVEN.

Yes, because we are checking for even parity and the total number of 1s is even.

❓ Question:

You received the following 8-bit data packet:

CopyEdit10110010

Assume that parity is ODD.

No, because we are checking for odd parity check but there is even total number of 1s when its supposed for the total number of 1s to be odd.

❓ Question:

You are given this 7-bit data packet:

1010110

Use even parity check

The parity bit should be 0 ( in exam you can put the parity bit in the parity bit row one!)

❓ Question:

You are given this 6-bit data packet:

110101

Use odd parity.

1,0 / 0,1 (any order is fine but the total number of ones but be odd at the 8 bit(6 bit with the extra 2 parity bit) total number of ones.)

READ THIS/ FLIP THE CARD

The exam will ask this question

Identify if data transmission from data packet is successful by even/odd parity

This means check if the total num of ones match which parity check you are checking.

Describe how to locate error in 2d Parity

First check each row and column and check which parity check it is (even or odd)
If both column and row is wrong, find where a row and column that have an issue intersect and flip that bit to fix the error.

Can parity checking fix errors?

So the data wont be sent incorrectly or

Give real world example of 2FA

(Learner's Opinion)
E.g. When you login to google by email and password and google sends a code to the user's email to confirm and the user must enter the code to access the account this provides two layers of security.

Compare passwords and biometrics for security. Which is more reliable?

This question both is correct but you need a good explanation to

Passwords is more reliable rather than biometrics, because people can use a picture of your face or your fingerprint to access your account but for passwords you can put a very strong password and hackers will not be able to use brute force attacks to guess your password.

One limitation of parity checking, give one example

It can only detect odd number of errors not even number of errors, for example a data packet 11011011 has two bits changed during transmissions, 10111011, the it still has the same total number of 1s in the data packet and so the wrong data will be transmitted.