KS4 Computer Science MCQs

Which of the following is NOT a method of network security?

• Authentication

• Encryption

• Firewall

• Copying data to USB

What is the primary purpose of encryption in network security?

• To detect errors in transmitted data

• To prevent unauthorized access to the network

• To make data unreadable to unauthorized users

• To check the identity of users

What type of encryption uses two keys: a public key and a private key?

• Symmetric encryption

• Asymmetric encryption

• Caesar cipher

• WEP

Which protocol is used for secure communication between a web browser and a banking website?

• FTP

• HTTP

• SMTP

• HTTPS

How does a firewall help secure a network?

• By encrypting data packets

• By checking and filtering data packets based on rules

• By authenticating users

• By blocking all network traffic

What is MAC address filtering used for?

• Encrypting data packets

• Blocking or allowing specific devices based on their MAC addresses

• Authenticating users with a username and password

• Monitoring network traffic for unusual behavior

Which layer of the TCP/IP protocol stack is responsible for routing data packets?

• Application layer

• Transport layer

• Internet layer

• Link layer

What is the purpose of using HTTPS over HTTP?

• To speed up the transfer of files

• To establish a wireless connection

• To encrypt data transmitted between the client and server

• To download emails faster

What makes the Caesar cipher insecure?

• It uses two keys for encryption and decryption

• The encryption key is too complex

• It only shifts letters by a fixed number of positions

• It requires a public key to encrypt the message

Which of the following protocols allows sending emails?

• POP

• FTP

• SMTP

• IMAP