Secure Network Administrationintermediate
Arrange the steps of an IPsec tunnel-mode transmission in the chronological order in which they occur.
Answer
The sending gateway encapsulates the original IP packet inside a new IPsec packet with an outer IP header., Intermediate routers forward the packet across the transit network using the outer IP header., The receiving gateway verifies, decrypts, and strips the outer IPsec header to restore the original packet., The receiving gateway forwards the restored original IP packet to the internal destination host.
Explanation
### The order\n1. **The sending gateway places the original packet inside the protected tunnel packet.** Encapsulation creates the outer header used across the transit network.\n2. **The transit network forwards the packet using its outer Internet Protocol (IP) header.** Transit routers need the outer destination to reach the remote gateway.\n3. **The receiving gateway recovers the original packet at the tunnel endpoint.** The endpoint removes the tunnel protection and restores the inner packet.\n\n### The concept\nTunnel mode protects an original IP packet by carrying it inside a new packet. The inner addresses identify the communicating hosts; the outer addresses identify the VPN gateways.\n\n### Remember\nTransit routers forward by the outer header; tunnel gateways recover the inner packet.
Related Questions
- Which statement best describes the protection a Virtual Private Network (VPN) provides?(basic)
- A VPN that encrypts traffic also guarantees that the applications on both endpoints are safe.(basic)
- Explain why a split-tunnel design can reduce central inspection, and identify the traffic affected.(advanced)
- Select ALL protection goals a VPN can support directly through the mechanisms described in the course.(intermediate)
- Compare remote-access and site-to-site VPN designs, including their endpoints and a suitable example of each.(basic)
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