Y13 Mocks Flashcards

Question

What is a VPN?

Answer 1

Virtual Private Network * Makes a ‘tunnelled’ network connection through the Internet or any other public network * Ideal for establishing a secure connection between private networks with remotes users * Enables a device to exchange data across the internet as if it was directly connected to a private connected

Answer 2

a LAN is connected to the internet one computer outside of the LAN is also connected to the internet VPN client and server running on the lone machine and the original LAN Internet connection

Answer 3

* Uses complex mathematical algorithms and encryption keys to alter a message into a form that is not understand to an unauthorised person * Only the person with the correct key can decode the message and read it

Answer 4

* Symmetric key encryption * Public key encryption

Answer 5

- Single key or secret key encryption - Same key used for encryption and decryption - Each device has a secret code that is sued to encrypt a packet before it is sent over an untrusted network - Receiving device should know and use the same key to decode the packet received - A well-known symmetric algorithm developed for computer was the Data Encryption Standard (DES) - Uses a 56-bit key - 72,057594,037,927,936 possible combinations for a brute force attack btw

Answer 6

- Also known as asymmetric key encryption - Uses a public key for encryption and a private key for decryption - Two keys are mathematically linked This type of encryption is used on the interne t - Transport Layer Security (TLS) AND Secure Socket Layer (SSL) encryption protocols, used for secure web communication, are based on public key encryption

Answer 7

compressed data where data is scrambled and is unintelligible

Answer 8

Two sides don’t need to have already shared secret key to communicate using encryption.

Answer 9

Messages take more time to encrypt and decrypt. Public key authenticity needs to be verified.

Answer 10

Encryption speed is faster and uses less resources that public-key encryption

Answer 11

Keys must be shared before they can be used. If the key becomes unknown by unauthorized individuals then a new key must be made

Answer 12

computer or software package used for a NETWORK - needs specific hardware - monitors and protects the network traffic of a computer or computer network - decides which computer gets access to the network based on a set of rules -

Answer 13

a network security system that determines what data comes in and goes out of a network or pc - may slow down computer

Answer 14

will prevent hackers and unauthorised people on the internet from getting onto the network - but can't stop people in range from getting wifi

Answer 15

fixed size structure of data of the same type

Answer 16

sequential search used to find specific component in array does this by checking each component sequentially

Answer 17

PSEUDOCODE: Array = [2,9,5,6,7,8] Search = 7 Found = false Counter = 0 loop Counter from 0 to Array.length – 1 if Array[Counter] = Search Found = true output Array[Counter] end if end loop if Found = false output Search, “ is not found in this array” end if

Answer 18

used on SORTED ARRAYS splits the array into two and checks it the middle term is higher or lower than the search term discards the list accordingly

Answer 19

Array = [11,12,15,16,112,118,123,145] Search = 15 Min = 0 Max = Array.length -1 Found = false Answer = 0 Mid = 0 loop while Found != true and Min <= Max Mid = (Min + Max) div 2 if Array[Mid] = Search Found = true Answer = Mid else if Search > Array[Mid] Min = Mid + 1 else High = Mid – 1 end if end while if Found = true then output Search, “was found at”, answer else output Search, “was not found in this array” end if

Answer 20

- an application software - used to find, receive and display content on the WWW - Includes texts, images and audio

Y13 Mocks Flashcards

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