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Questions and Answers

What is a key benefit of using tunnel mode over transport mode?

Tunnel mode is more efficient

Tunnel mode provides confidentiality

Tunnel mode hides information about communicating parties (correct)

Tunnel mode is used for AH authentication

What type of protection does AH provide on the header?

Authentication only

Encryption only

Integrity protection only (correct)

Confidentiality and integrity

What is a key difference between ESP and AH?

ESP is used for authentication, AH is used for encryption

ESP is used for tunnel mode, AH is used for transport mode

ESP provides confidentiality, AH provides authentication

AH protects the IP header, ESP does not (correct)

Why is AH still useful despite ESP providing encryption and authentication?

AH protects the IP header, which ESP does not Signup and view all the answers

What is the purpose of an Intrusion Detection System (IDS)?

To detect intrusion Signup and view all the answers

What is the concept of using both firewalls and IDS?

Defense in depth Signup and view all the answers

What is the primary function of IKE in IPsec?

To provide mutual authentication and establish a shared key Signup and view all the answers

What information does an IPsec header contain?

The security association to use Signup and view all the answers

What is the purpose of a security association (SA) in IPsec?

To define a network-layer unidirectional logical connection Signup and view all the answers

What are the two phases of IKE in IPsec?

Session key derivation and SA creation Signup and view all the answers

What is contained in a security association (SA) in IPsec?

The cryptographic keys and algorithms used Signup and view all the answers

Why is it not recommended to use the same key for each flow in IPsec?

Because it increases the risk of key compromise Signup and view all the answers

What is the main purpose of the initiator's message in the aggressive mode of IKE phase 1?

To negotiate the cryptographic algorithms Signup and view all the answers

What is the outcome of the main mode of IKE phase 1?

Establishment of a security association Signup and view all the answers

What is the primary function of the authentication method in IPsec?

To authenticate the sender's identity Signup and view all the answers

What is the benefit of allowing parties to negotiate cryptographic algorithms and parameters in IPsec?

It allows users to migrate to stronger crypto Signup and view all the answers

What is the primary difference between the aggressive mode and the main mode of IKE phase 1?

The number of messages exchanged between the parties Signup and view all the answers

What is the purpose of the 'proofs of identity' in IKE phase 1?

To authenticate the responder's identity Signup and view all the answers