問答題AAA authentication login做什么用？

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2.單項選擇題While deploying a new switch，you accidently connect ports 3/12 and 3/18 together，creating a loop.STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？（）

A.Port 3/12 was already up and forwarding before the loop was created.
B.Port priority is based on lowest priority and lowest port number.
C.You connected the wire on port 3/18 last.
D.None of the above， it is purely random.

5.單項選擇題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

8.單項選擇題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

9.多項選擇題In your Cisco EIGRP network，you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur？（）

A.An update packet with init flag set from a known， already established neighbor relationship was received by one of the routers.
B.The ARP cache was cleared.
C.The counters were cleared.
D.The IP EIGRP neighbor relationship was cleared manually.