单选题You want to implement router redundancy in the Company network using the best method available. Which protocol specified by RFC 2281 provides network redundancy for IP networks， ensuring that user traffic immediately and transparently recovers from first-hop failures in network edge devices or access circuits？（）A ICMPB IRDPC HSRPD STPE None of the other alternatives apply
单选题
You want to implement router redundancy in the Company network using the best method available. Which protocol specified by RFC 2281 provides network redundancy for IP networks， ensuring that user traffic immediately and transparently recovers from first-hop failures in network edge devices or access circuits？（）
A
ICMP
B
IRDP
C
HSRP
D
STP
E
None of the other alternatives apply
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