Which statement is true about GRE's security features?

Which statement is true about GRE's security features?

• A. GRE has very limited security features
• B. GRE provides strong encryption
• C. GRE cannot transport non-IP protocols
• D. GRE ensures data integrity

Answer: (A)

GRE is a tunneling protocol that encapsulates a wide range of payloads inside an outer IP header to move them between endpoints. It does not offer encryption, strong authentication, or end-to-end data integrity by itself. Because of this, GRE’s security features are very limited; protecting GRE traffic typically requires layering another mechanism, such as IPsec, to provide encryption and integrity. GRE can transport non-IP protocols, so the idea that it cannot transport non-IP payloads isn’t correct. It also does not guarantee data integrity on its own, and it does not provide strong encryption by itself. So the statement that GRE has very limited security features best describes its security characteristics.

GRE is a tunneling protocol that encapsulates a wide range of payloads inside an outer IP header to move them between endpoints. It does not offer encryption, strong authentication, or end-to-end data integrity by itself. Because of this, GRE’s security features are very limited; protecting GRE traffic typically requires layering another mechanism, such as IPsec, to provide encryption and integrity. GRE can transport non-IP protocols, so the idea that it cannot transport non-IP payloads isn’t correct. It also does not guarantee data integrity on its own, and it does not provide strong encryption by itself. So the statement that GRE has very limited security features best describes its security characteristics.