問答題what is portfast？

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1.問答題What’s PHB？
2.單項(xiàng)選擇題What are the mandatory， well-known BGP attributes？（）

A.origin,AS-path,next-hop
B.AS-path,origin,MED
C.AS-path,origin,weight
D.AS-path,weight,MED

5.單項(xiàng)選擇題Your Cisco network currently runs OSPF and you have a need to policy-route some specific traffic， regardless of what the routing table shows. Which one of these options would enable you to policy-route the traffic？（）

A.source IP address and the protocol （such as SSL， HTTPS， SSH）
B.the packet Time to Live and the source IP address
C.type of service header and DSCP value
D.destination IP address