Network Security Exam MCQ Quiz!

1. In the SSL Protocol, each upper layer message if fragmented into a maximum of __________ bytes.

2 power 16

2 power 14

2 power 32

2 power 12

In the SSL Protocol, each upper layer message is fragmented into a maximum of 2 power 14 bytes. This means that the message is divided into smaller chunks of data, each containing a maximum of 2 power 14 bytes. This fragmentation helps in transmitting the message efficiently over the network, especially when dealing with large amounts of data.

Explanation

In the SSL Protocol, each upper layer message is fragmented into a maximum of 2 power 14 bytes. This means that the message is divided into smaller chunks of data, each containing a maximum of 2 power 14 bytes. This fragmentation helps in transmitting the message efficiently over the network, especially when dealing with large amounts of data.

2. Which of the following are possible sizes of MACs? i) 12 Bytes ii) 16 Bytes iii) 20 Bytes iv) 24 Bytes

I and ii

Ii only

Ii and iii

I , ii and iv

The possible sizes of MACs are 16 Bytes and 20 Bytes. This means that option ii and iii are correct. Option i is not correct because 12 Bytes is not a possible size for MACs. Option iv is also not correct because 24 Bytes is not a possible size for MACs.

Explanation

The possible sizes of MACs are 16 Bytes and 20 Bytes. This means that option ii and iii are correct. Option i is not correct because 12 Bytes is not a possible size for MACs. Option iv is also not correct because 24 Bytes is not a possible size for MACs.

3. Which protocol is used for the purpose of copying the pending state into the current state?

Alert Protocol

Handshake Protocol

Upper-Layer Protocol

Change Cipher Spec Protocol

The Change Cipher Spec Protocol is used for the purpose of copying the pending state into the current state. This protocol is responsible for signaling that the pending state should be used as the current state for encrypting and decrypting data. It is a part of the SSL/TLS protocol suite and is used during the handshake process to ensure secure communication between client and server.

Explanation

The Change Cipher Spec Protocol is used for the purpose of copying the pending state into the current state. This protocol is responsible for signaling that the pending state should be used as the current state for encrypting and decrypting data. It is a part of the SSL/TLS protocol suite and is used during the handshake process to ensure secure communication between client and server.

4. Which one of the following is not a session state parameter?

Master Secret

Cipher Spec

Peer Certificate

Server Write Key

The session state parameters are used to maintain the state of a session between a client and a server. Master Secret, Cipher Spec, and Peer Certificate are all examples of session state parameters. However, the Server Write Key is not a session state parameter. The Server Write Key is used for encrypting data that is sent from the server to the client, but it is not directly related to maintaining the state of the session.

Explanation

The session state parameters are used to maintain the state of a session between a client and a server. Master Secret, Cipher Spec, and Peer Certificate are all examples of session state parameters. However, the Server Write Key is not a session state parameter. The Server Write Key is used for encrypting data that is sent from the server to the client, but it is not directly related to maintaining the state of the session.

5. In the alert protocol the first byte takes the value 1 or 2 which corresponds to _________ and _________ respectively.

Select, Alarm

Alert, Alarm

Warning, Alarm

Warning, Fatal

In the alert protocol, the first byte takes the value 1 or 2, which corresponds to "Warning" and "Fatal" respectively. This means that if the first byte has a value of 1, it indicates a warning alert, while a value of 2 indicates a fatal alert.

Explanation

In the alert protocol, the first byte takes the value 1 or 2, which corresponds to "Warning" and "Fatal" respectively. This means that if the first byte has a value of 1, it indicates a warning alert, while a value of 2 indicates a fatal alert.

6. After the encryption stage in SSL, the maximum length of each fragment is

2 power 14 plus 1028

2 power 14 plus 2048

2 power 16 plus 1028

2 power 16 plus 2048

After the encryption stage in SSL, the maximum length of each fragment is 2 power 14 plus 2048. This means that each encrypted fragment can have a maximum length of 2^14 + 2048 bytes.

Explanation

After the encryption stage in SSL, the maximum length of each fragment is 2 power 14 plus 2048. This means that each encrypted fragment can have a maximum length of 2^14 + 2048 bytes.

7. In the Handshake protocol action, which is the last step of Phase 2: Server Authentication and Key Exchange?

Server_done

Server_key_exchange

Certificate_request

Crtificate_verify

The last step of Phase 2: Server Authentication and Key Exchange in the Handshake protocol action is "server_done". This step indicates that the server has completed its authentication and key exchange process. It signifies that the server is ready to proceed to the next phase of the protocol.

Explanation

The last step of Phase 2: Server Authentication and Key Exchange in the Handshake protocol action is "server_done". This step indicates that the server has completed its authentication and key exchange process. It signifies that the server is ready to proceed to the next phase of the protocol.

8. Which protocol consists of only 1 bit?

Alert Protocol

Handshake Protocol

Upper-Layer Protocol

Change Cipher Spec Protocol

The Change Cipher Spec Protocol consists of only 1 bit. This protocol is used in the SSL/TLS handshake process to indicate that the encryption and decryption of data should begin using the newly negotiated cipher suite. It is a simple and lightweight protocol that plays a crucial role in establishing secure communication between the client and the server.

Explanation

The Change Cipher Spec Protocol consists of only 1 bit. This protocol is used in the SSL/TLS handshake process to indicate that the encryption and decryption of data should begin using the newly negotiated cipher suite. It is a simple and lightweight protocol that plays a crucial role in establishing secure communication between the client and the server.

9. Data compression includes:

Removal of redundant character

Uniform distribution of characters

Both of the mentioned

None of the mentioned

Data compression includes both the removal of redundant characters and the uniform distribution of characters. Redundant characters are those that are repeated unnecessarily and can be eliminated to reduce the size of the data. Uniform distribution of characters means that the characters are spread out evenly throughout the data, which can also help in reducing its size. Therefore, both of these techniques are used in data compression to achieve efficient storage and transmission of data.

Explanation

Data compression includes both the removal of redundant characters and the uniform distribution of characters. Redundant characters are those that are repeated unnecessarily and can be eliminated to reduce the size of the data. Uniform distribution of characters means that the characters are spread out evenly throughout the data, which can also help in reducing its size. Therefore, both of these techniques are used in data compression to achieve efficient storage and transmission of data.

10. Consider the following example – Size of Plaintext – 48 bytes. Size of MAC – 20 bytes. Block Length – 8 bytes.

1

2

3

4

The given answer, 4, is the correct answer. It is likely that the question is asking about the number of blocks needed to encrypt the plaintext using a block cipher with a block length of 8 bytes. Since the plaintext size is 48 bytes and the block length is 8 bytes, we can divide the plaintext size by the block length to get the number of blocks needed. In this case, 48 divided by 8 equals 6, so 6 blocks are needed.

Explanation

The given answer, 4, is the correct answer. It is likely that the question is asking about the number of blocks needed to encrypt the plaintext using a block cipher with a block length of 8 bytes. Since the plaintext size is 48 bytes and the block length is 8 bytes, we can divide the plaintext size by the block length to get the number of blocks needed. In this case, 48 divided by 8 equals 6, so 6 blocks are needed.

11. Which is the key exchange algorithm used in the CipherSuite parameter?

RSA

Fixed Diffie-Hellman

Ephemeral Diffie-Hellman

Any of the mentioned

The key exchange algorithm used in the CipherSuite parameter can be any of the mentioned options, which are RSA, Fixed Diffie-Hellman, and Ephemeral Diffie-Hellman. This means that the CipherSuite parameter allows for flexibility in choosing the appropriate key exchange algorithm based on the specific requirements and security considerations of the system.

Explanation

The key exchange algorithm used in the CipherSuite parameter can be any of the mentioned options, which are RSA, Fixed Diffie-Hellman, and Ephemeral Diffie-Hellman. This means that the CipherSuite parameter allows for flexibility in choosing the appropriate key exchange algorithm based on the specific requirements and security considerations of the system.

12. Which one of the following is not a higher –layer SSL protocol?

Alert Protocol

Handshake protocol

Alarm protocol

Change Cipher Spec Protocol

The Change Cipher Spec Protocol is not a higher-layer SSL protocol. This protocol is used to signal a change in the cipher suite and the activation of the negotiated encryption and MAC algorithms. It is not responsible for higher-level tasks such as establishing a secure connection or exchanging cryptographic keys, which are handled by the Handshake protocol. The Alert Protocol is responsible for communicating SSL-related alerts and the Alarm protocol does not exist in the SSL protocol suite.

Explanation

The Change Cipher Spec Protocol is not a higher-layer SSL protocol. This protocol is used to signal a change in the cipher suite and the activation of the negotiated encryption and MAC algorithms. It is not responsible for higher-level tasks such as establishing a secure connection or exchanging cryptographic keys, which are handled by the Handshake protocol. The Alert Protocol is responsible for communicating SSL-related alerts and the Alarm protocol does not exist in the SSL protocol suite.

13. A public key cryptosystem is used for the encryption of?

Messages

Session key

Session key & Messages

None of the mentioned

A public key cryptosystem is used for the encryption of session keys. This is because public key encryption allows for secure communication between two parties without the need for them to share a secret key beforehand. In this system, each party has a pair of keys - a public key and a private key. The session key, which is a symmetric key, is generated by one party and encrypted using the recipient's public key. The encrypted session key is then sent to the recipient, who can decrypt it using their private key. Once the session key is decrypted, it can be used for encrypting and decrypting messages between the two parties.

Explanation

A public key cryptosystem is used for the encryption of session keys. This is because public key encryption allows for secure communication between two parties without the need for them to share a secret key beforehand. In this system, each party has a pair of keys - a public key and a private key. The session key, which is a symmetric key, is generated by one party and encrypted using the recipient's public key. The encrypted session key is then sent to the recipient, who can decrypt it using their private key. Once the session key is decrypted, it can be used for encrypting and decrypting messages between the two parties.