问题:
A . VPN tunnel authentication is part of the IKE specification.
B . VPN tunnel authentication does not control which end user can use the IPSec SA (VPN tunnel).
C . User authentication is used to control access for a specific user ID, and can be used with or without a VPN tunnel for network access authorization.
D . 802.1X with EAP-TLS (X.509 certificates) can be used to authenticate an IPSec tunnel.
● 参考解析
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