18 Questions
What is the primary limitation of manual keying in IPsec?
It is impractical for VPNs with 100s of endpoints
What is the main purpose of IKE in IPsec?
To authenticate endpoints and establish IPsec SAs
What is the primary difference between PSK and PKI in IKE?
PSK uses a shared secret, while PKI uses a public/private key pair
What is the similarity between IKE and SSL handshakes?
Both involve an authentication and key exchange process
What is the purpose of the encryption key in an IPsec SA?
To encrypt the datagram
What is the main benefit of using IPsec IKE over manual keying?
It is more scalable
What is the primary purpose of the Sequence number in ESP header?
To prevent attacker from sniffing and replaying a packet
What is the function of the Security Policy Database (SPD)?
To determine which SA to use for a given datagram
What is the purpose of the MAC in ESP auth field?
To authenticate the IP datagram payload
What is the purpose of padding in ESP trailer?
To prevent block ciphers from being broken
What is the goal of using IPsec sequence numbers?
To prevent attacker from sniffing and replaying a packet
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
What is the primary motivation for institutions to use Virtual Private Networks (VPNs)?
To provide private networks for security purposes
What is the purpose of the Authentication Header (AH) protocol in IPsec?
To provide source authentication and data integrity
What is the benefit of using IPsec in transport mode?
It provides confidentiality and integrity for upper-level protocols
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
What is the purpose of the Encapsulation Security Protocol (ESP) in IPsec?
To provide source authentication, data integrity, and confidentiality
What is the benefit of using Virtual Private Networks (VPNs) for institutions?
To provide logically separate networks for security purposes
Learn about the motivation behind Virtual Private Networks (VPNs) and how they provide secure communication between network entities. Understand the concept of 'blanket coverage' and how VPNs ensure private networks for institutions.
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