多項(xiàng)選擇題

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

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多項(xiàng)選擇題

HSRP is being set up between two Company devices.
In what three states is it possible for an HSRP router to be in？（）

A. Standby
B. Established
C. Active
D. Idle
E. Backup
F. Init

多項(xiàng)選擇題

R1 and R2 exchange HSRP between each other in the Company network.
In which three HSRP states do routers send hello messages？（）

A. Learn
B. Speak
C. Standby
D. Listen
E. Active
F. Remove