A security technician is trying to connect a remote site to the central office over a site-to-site VPN. The technician has verified the source and destination IP addresses are correct, but the technician is unable to get the remote site to connect. The following error message keeps repeating: An error has occurred during Phase 1 handshake. Deleting keys and retrying... Which of the following is most likely the reason the connection is failing?
- AThe IKE hashing algorithm uses different key lengths on each VPN device. (correct answer)
- BThe IPSec settings allow more than one cipher suite on both devices.
- CThe Diffie-Hellman group on both sides matches but is a legacy group.
- DThe remote VPN is attempting to connect with a protocol other than SSL/TLS.
Reveal answer & explanationHide answer
The correct answer is A. Option A: The IKE hashing algorithm uses different key lengths on each VPN device.
Explanation
Hashing produces a one-way digest used to verify integrity without exposing the original value. A VPN creates an encrypted tunnel across an untrusted network for private remote or site connectivity. This option keeps traffic private / properly secured as required.

