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- 多项选择题 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 
- A,B,D,F
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A、 HSRP
B、 IRDP
C、 ICMP
D、 VRRP
E、 MSTP
F、 GLBP
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