300-135题库中不理解的题，求助。

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300-135题库（2019.11.27）中有几个问题不理解，请指教。

QUESTION 2
Which two commands can be used to show the number of packets dropped by Unicast RPF?(choose two)
A. show ip interface
B. show interface
C. show ip cef
D. show ip traffic
E. show cef interface
Correct Answer: AD

这题我不理解。是否有详细解释啊？

QUESTION7
Refer to the exhibit, interface Gi1/2 is the root port for VLAN 40 on DSW-01.which
configuration would establish interface Gi1/1 the new root port for VLAN 40?
A. DSW-01(config)#interface gig1/1
DSW-01(config-if)#spanning-tree port-priority 0
B. DSW-01(config)#interface gig1/2
DSW-01(config-if)#spanning-tree port-priority 0
C. DSW-01(config)#interface gig1/1
DSW-01(config-if)#spanning-tree cost 1
D. DSW-01(config)#interface gig1/2
DSW-01(config-if)#spanning-tree cost 5
Correct Answer: D

A为啥不对啊？

QUESTION8
Refer to the exhibit,Dynamic trunk negotiation fails between S1 and S2,which cause of
the problem is true ?
A. there are different VTP domain for S1 and S2
B. there is a speed mismatch between S1 and S2
C. S1 has a FastEthernet interface
D. The switchport mode is set to desirable
Correct Answer: A

这个题不理解。谁能讲解下？

QUESTION9
Refer to the exhibit user on the 172.16.1.0/24 and 172.16.3.0/24 networks report that they frequently connection at the remote site, what cause of the problem is true?
A. recursive routing
B. static IP route s
C. IP access list
D. RIP auto summarization
Correct Answer: A

题目没看懂，是什么问题？为什么选A？

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