CCNP (300-115) 題目260 ＆ 360題有問題？

junejune

QUESTION 261

Ifall devices on an EtherChannel are sending traffic to a single MAC address,which two methods of load balancing on the EtherChannel are preferred? (Choosetwo.)

A.destination-MAC

B.src-dst-MAC

C.destination-IP

D.source-MAC

E.source-IP

Correct Answer: BD or BE

Section: part6

Explanation

請問各位大大 ， 這題答案到底是 ＢＤ還是ＢＥ呢？

網路上面查兩種答案都有！各位前輩的說法都有道理

快要考試我的覺得焦慮...........

到底哪裡有正確答案可以看

還有好多題的題目答案都是這樣..........

QUESTION 360
Refer to the exhibit.

                               
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Which two statements about the network environment of the interface that generated (Choose two)

A.The configured VRRP priority of the interface is 120correct

B.The device on which the interface resides is acting as a standby router

C.The Skew time 3.531 secondscorrect

D.The Configured VRRP Priority of the interface is 105correct

E.If the priority of another router is higher than the priority of the master router, it becomes the master router

Correct Answer: .............

Section: part8

Explanation

請問各位大大 ， 這題答案到底是 CＤ還是AC 還是 AE呢？ 甚至還有ＤＥ  

我的天～～～～～ 這題到底是？？？？

linnwei4001

我也看到这两题存疑，题库给的答案我感觉不对。所以想来问问是不是题库的答案也有不正确的。

linnwei4001

question 360

Router上配的priority应该是120,，模拟实验的话能看到track的链路down就是会减priority。UP的话链路会标up。但是模拟器上减了priority之后会在后面标原本配的是多少（cfgd 150）,题里给的图没有这个。

ESW1(config-if)#do show vrr
FastEthernet1/10 - Group 1
  State is Master
  Virtual IP address is 3.3.3.3
  Virtual MAC address is 0000.5e00.0101
  Advertisement interval is 1.000 sec
  Preemption enabled
  Priority is 90  (cfgd 150)
    Track object 1 state Down decrement 60
  Master Router is 3.3.3.1 (local), priority is 90
  Master Advertisement interval is 1.000 sec
  Master Down interval is 3.414 sec

ESW1(config)#do show vr
FastEthernet1/10 - Group 1
  State is Init
  Virtual IP address is 3.3.3.3
  Virtual MAC address is 0000.5e00.0101
  Advertisement interval is 1.000 sec
  Preemption enabled
  Priority is 150
    Track object 1 state Up decrement 60
  Master Router is unknown, priority is unknown
  Master Advertisement interval is unknown
  Master Down interval is unknown

搜了一下skew time，按照这个说法，skew time不等于master_down_interval。 所以我觉得题库给的答案不对。

Master路由器主动放弃Master地位（如Master路由器退出虚拟路由器）时，会发送优先级为0的VRRP报文，致使Backup路由器快速切换变成Master路由器。这个切换的时间称为Skew time，计算方式为：（256－Backup路由器的优先级）/256，单位为秒。

当Master路由器发生网络故障而不能发送VRRP报文的时候，Backup路由器并不能立即知道其工作状况。Backup路由器等待一段时间之后，如果还没有接收到VRRP报文，那么会认为Master路由器无法正常工作，而把自己升级为Master路由器，周期性发送VRRP报文。如果此时多个Backup路由器竞争Master路由器的位置，将通过优先级来选举Master路由器。Backup路由器默认等待的时间称为Master_Down_Interval，取值为：（3×VRRP报文的发送时间间隔）＋Skew time，单位为秒。