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在GRE Tunnel接口视图下，配置隧道封装模式为GRE的完整命令为（）。
- A、tunnel protocol gre
- B、tunnel gre
- C、tunnel-protocol gre
- D、protocol gre
参考答案
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单选题When configuring a multipoint GRE （mGRE） tunnel interface， which one of the following is NOT a valid configuration option：（）A
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tunnel keyD
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多选题Which two mechanisms can be used to detect IPsec GRE tunnel failures？（）ADead Peer Detection （DPD）BCDPCisakmp keepalivesDGRE keepalive mechanismEThe hello mechanism of the routing protocol across the IPsec tunnel
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单选题To securely transport EIGRP traffic， a network administrator will build VPNs between sites. Whatis the best method to accomplish the transport of EIGRP traffic？（）A
IPSec in tunnel modeB
IPSec in transport modeC
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