Which of the following are common issues that should be considered when establishing ortroubleshooting site-to-site VPNs？（Choose all that apply.）（）A、User authenticationB、Overlapping IP address spaceC、GRE or IPsec configurationD、MTU sizeE、VPN client softwa
题目
Which of the following are common issues that should be considered when establishing ortroubleshooting site-to-site VPNs？（Choose all that apply.）（）
- A、User authentication
- B、Overlapping IP address space
- C、GRE or IPsec configuration
- D、MTU size
- E、VPN client software
- F、Authentication server configured ly