To protect against first-hop router failure， four protocols were developed to ensure IP routing redundancy. Which of the following are they？（）
- A、 HSRP
- B、 IRDP
- C、 ICMP
- D、 VRRP
- E、 MSTP
- F、 GLBP
正确答案:A,B,D,F
答案解析:有
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To protect against first-hop router failure， four protocols were developed to ensure IP routing redundancy. Which of the following are they？（）
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