Virtual Private Networks (VPNs) and Network Security

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What is the primary limitation of manual keying in IPsec?

It is impractical for VPNs with 100s of endpoints (correct)

It is not secure

It is not compatible with PKI

It requires a central key management system

What is the main purpose of IKE in IPsec?

To masquerade as another IP address

To replay datagrams

To authenticate endpoints and establish IPsec SAs (correct)

To encrypt datagrams

What is the primary difference between PSK and PKI in IKE?

PSK uses a shared secret, while PKI uses a public/private key pair (correct)

PSK uses a private key, while PKI uses a public key

PSK uses a certificate, while PKI uses a shared secret

PSK uses a secure socket, while PKI uses a secure layer

What is the similarity between IKE and SSL handshakes?

Both involve an authentication and key exchange process Signup and view all the answers

What is the purpose of the encryption key in an IPsec SA?

To encrypt the datagram Signup and view all the answers

What is the main benefit of using IPsec IKE over manual keying?

It is more scalable Signup and view all the answers

What is the primary purpose of the Sequence number in ESP header?

To prevent attacker from sniffing and replaying a packet Signup and view all the answers

What is the function of the Security Policy Database (SPD)?

To determine which SA to use for a given datagram Signup and view all the answers

What is the purpose of the MAC in ESP auth field?

To authenticate the IP datagram payload Signup and view all the answers

What is the purpose of padding in ESP trailer?

To prevent block ciphers from being broken Signup and view all the answers

What is the goal of using IPsec sequence numbers?

To prevent attacker from sniffing and replaying a packet Signup and view all the answers

What information does the SPD use to determine which SA to use for a given datagram?

Source and destination IP address, protocol number, and other factors Signup and view all the answers

What is the primary motivation for institutions to use Virtual Private Networks (VPNs)?

To provide private networks for security purposes Signup and view all the answers

What is the purpose of the Authentication Header (AH) protocol in IPsec?

To provide source authentication and data integrity Signup and view all the answers

What is the benefit of using IPsec in transport mode?

It provides confidentiality and integrity for upper-level protocols Signup and view all the answers

What is the primary difference between IPsec transport mode and tunneling mode?

Transport mode is used for end-to-end encryption, while tunneling mode is used for encryption between edge routers Signup and view all the answers

What is the purpose of the Encapsulation Security Protocol (ESP) in IPsec?

To provide source authentication, data integrity, and confidentiality Signup and view all the answers

What is the benefit of using Virtual Private Networks (VPNs) for institutions?

To provide logically separate networks for security purposes Signup and view all the answers

Virtual Private Networks (VPNs) and Network Security

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