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Which of the following IP transmission types encrypts all of the transmitted data?
Correct Answer: A
* Definition of ESP (Encapsulating Security Payload): * ESP is a part of the IPsec protocol suite used to provide confidentiality, integrity, and authenticity of data. ESP encrypts the payload and optional ESP trailer, providing data confidentiality. * ESP Functionality: * ESP can encrypt the entire IP packet, ensuring that the data within the packet is secure from interception or eavesdropping. It also provides options for data integrity and authentication. * ESP operates in two modes: transport mode (encrypts only the payload of the IP packet) and tunnel mode (encrypts the entire IP packet). * Comparison with Other Protocols: * AH (Authentication Header): Provides data integrity and authentication but does not encrypt the payload. * GRE (Generic Routing Encapsulation): A tunneling protocol that does not provide encryption. * UDP (User Datagram Protocol) and TCP (Transmission Control Protocol): These are transport layer protocols that do not inherently provide encryption. Encryption must be provided by additional protocols like TLS/SSL. * Use Cases: * ESP is widely used in VPNs (Virtual Private Networks) to ensure secure communication over untrusted networks like the internet. References: * CompTIA Network+ study materials on IPsec and encryption.
