IPsec is commonly used for what in VPNs?

IPsec is commonly used for what in VPNs?

• A. Cloud storage
• B. Encrypting IP packets
• C. Data backup
• D. WAN optimization

Answer: (B)

IPsec in VPNs is used to keep data confidential by encrypting the IP packets as they travel across untrusted networks. It operates at the IP layer and uses mechanisms like ESP to encrypt the payload, often in tunnel mode to protect whole packets between endpoints. This encryption is the primary reason IPsec is chosen for VPNs, providing confidentiality (and can also offer integrity and authentication). The other options—cloud storage, data backup, and WAN optimization—are not about protecting the contents of packets in transit, so they don’t describe IPsec’s main function in VPNs.

IPsec in VPNs is used to keep data confidential by encrypting the IP packets as they travel across untrusted networks. It operates at the IP layer and uses mechanisms like ESP to encrypt the payload, often in tunnel mode to protect whole packets between endpoints. This encryption is the primary reason IPsec is chosen for VPNs, providing confidentiality (and can also offer integrity and authentication). The other options—cloud storage, data backup, and WAN optimization—are not about protecting the contents of packets in transit, so they don’t describe IPsec’s main function in VPNs.