Computer Network : Network Security (Test 1) : Free online Test by Teachexam

Question : Which property of network security ensures that data remains unchanged during transmission?

Confidentiality

Integrity

Authentication

Availability

Question : Which of the following attacks involves intercepting communication between two parties without their knowledge?

Phishing

DDoS

Man-in-the-Middle (MITM)

Ransomware

Question : Which network security tool is primarily responsible for monitoring and blocking unauthorized traffic based on predefined rules?

VPN

Firewall

Intrusion Prevention System

Antivirus

Question : In which cryptographic method does the sender use a public key and the receiver uses a private key to decrypt data?

Secret Key Cryptography

Public Key Cryptography

Message Digest

Hashing

Question : Which of the following ensures that a sender cannot deny sending a message?

Privacy

Authentication

Non-repudiation

Integrity

Question : Which of the following algorithms is commonly associated with public key cryptography?

AES

DES

RSA

Blowfish

Question : In asymmetric encryption, which key is used by the sender to encrypt data?

Private key of sender

Public key of receiver

Private key of receiver

Secret key

Question : Which of the following is a major challenge of symmetric encryption?

Slow processing speed

Key distribution problem

Requires two keys

Not used in modern systems

Question : In symmetric (secret key) encryption, which statement is correct?

Two different keys are used for encryption and decryption

Only public key is used

Same key is used for both encryption and decryption

No key is required

Question : Which of the following best defines the primary goal of computer network privacy?

Increasing data transmission speed

Making data unreadable to unauthorized users

Reducing network traffic

Sharing data publicly

Question : Which statement is NOT correct about digital signatures?

They use asymmetric (public-key) cryptography

They provide non-repudiation

They ensure confidentiality of the message by default

They use hash functions like SHA

Question : What will happen if the two digests (sender and receiver) do NOT match during verification?

Message is authentic

Message is encrypted

Message has been altered or signature is invalid

Message is compressed

Question : Why is a message digest (hash) used instead of signing the entire message?

To increase message size

To reduce computational cost and improve efficiency

To provide confidentiality

To avoid using public key cryptography

Question : In a digital signature system, which key is used by the sender to sign the message?

Receiver’s public key

Sender’s public key

Sender’s private key

Receiver’s private key

Question : Which of the following security aspects are primarily achieved using a digital signature?

Confidentiality only

Integrity, Authentication, and Non-repudiation

Privacy and Confidentiality only

Encryption and Decryption only

Question : Which concept in PGP replaces centralized certificate authorities?

Digital Envelope

Web of Trust

Key Escrow

Firewall System

Question : In PGP, how is the session key securely transmitted to the receiver?

Sent as plain text

Encrypted with sender’s private key

Encrypted with receiver’s public key

Stored in hash format

Question : Why does PGP use a session key?

To replace public keys permanently

To improve speed using symmetric encryption

To eliminate hashing

To avoid digital signatures

Question : In PGP, the digital signature is created by:

Encrypting the message with receiver’s public key

Encrypting the hash with sender’s private key

Encrypting the hash with receiver’s private key

Encrypting the message with sender’s public key

Question : Which combination of techniques is used by PGP to ensure security?

Only symmetric encryption

Only asymmetric encryption

Symmetric + Asymmetric + Hashing

Only hashing