单项选择题
A. per host using a round robin scheme
B. per host using a strict priority scheme
C. per session using a round robin scheme
D. per session using a strict priority scheme
E. per GLBP group using a round robin scheme
F. per GLBP group using a strict priority scheme
单项选择题 Which one of the statements below correctly describes the Virtual Router Redundancy Protocol （VRRP）， which is being used in the Company network to provide redundancy？（）
单项选择题 HSRP has been configured between two Company devices. What kind of message does an HSRP configured router send out every 3 seconds？（）
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？（）