642-902 PASS,题库勘误和个人感想
一直以来在鸿鹄网上下载资料,看到大家的战报,对我的考试有很大的帮助。我来分享下自己的902考试情况和自己的一些体会吧。考试一共考50道题。题库全覆盖,5个实验全部都考到了,45个选择题,没有拖图题,没有任何新题。
1)重分布,要求从R1的还回口pingR4的还回口,R2与R3之间是以太网口相连,要求用最好的路径。就按照题库的解题方法完成。不支持扩展ping,不支持ping dest source,只能用traceroute验证。其实看路由表也是一样的。
2)IPv6的OSPF那道题,依旧是不能做ping测试的,只能看路由表。
最后放水几道题,安全通过。
关于满分的一些想法:
如果非大牛,没有题库,我想要在规定的2小时里完成这些考题,难度都很大,遑论还要考到满分。尤其是现在很多人都是通过速成的方法去学习,去考试。
举个例子,我们从小的中考,高考,一个省,一个市,几万考生,多少大牛,也只有零星的几个人单科成绩考到满分,那还是寒窗苦读多少年的结果。
且不说那个千分传言是不是真的,我觉得于情于理没有必要去考到那个1000分。考到了1000分,我觉得很大程度也只能代表考生对题库的掌握度达到了100%(大牛除外),实际对知识的理解和技能的操作也只有考生自己知道了。
不论是思科还是VUE,对考试都有统计的,比如每道题的平均解题时间和每道题的平均正确率。如果某一国家/地区的考试成绩持续高于平均线的话,或者满分太多的话,那就是真的有问题。
对于题库里有争议的题目,我说下自己的想法(所有的图都以题库为准,我就不贴了)。
第53题:
Which statement about a non-zero value for the load metric (k2) for EIGRP is true? Select the best response.
A. A change in the load on an interface will cause EIGRP to recalculate the routing metrics and send a corresponding update out to each of its neighbors.
B. EIGRP calculates interface load as a 5-minute exponentially weighted average that is updated every 5minutes.
C. EIGRP considers the load of an interface only when sending an update for some other reason.
D. A change in the load on an interface will cause EIGRP to recalculate and update the administrative distance for all routes learned on that interface.
我觉得A正确。在GNS3上搭了个拓扑,因为不好模拟Load这个metric值,我就换成了bandwidth,发现只要修改了bandwidth,马上就会发update报文给邻居。
第87题:
Refer to the exhibit. Examine the partial configuration and the routing table excerpt. Which routes would be redistributed into OSPF area 1?
A. 10.10.10.16/28 only
B. 10.10.10.16/28 and 10.10.10.64/26
C. 10.10.10.16/28, 10.10.10.64/26, and 172.16.10.0/24
D. 10.10.10.64/26 only
答案是B。我自己搭了个图,测试过。
第102题:
Refer to the exhibits. Router B should advertise the network connected to the E0/0/0 interface to router A and block all other network advertisements. The IP routing table on router A indicates that it is not receiving this prefix from router B.What is the probable cause of the problem? Select the best response.
A. An access list on router B is causing the 192.168.3.16/28 network to be denied.
B. An access list on router B is causing the 192.168.3.32/28 network to be denied.
C. The distribute list on router B is referencing a numbered access list that does not exist on router B.
D. The distribute list on router B is referencing the wrong interface.
答案A是正确的,自己搭个拓扑,在router B上写个ACL, deny any any,然后出站接口调用一下,你就会看到这个debug结果。
第277题:
Refer to the exhibit. Router RTR is attempting to establish BGP neighbor relationships with routers RT1 and RT3. On the basis of the information that is presented in the exhibit, which two statements are true?(Choose two)
A. RTR has a BGP password set but neighbor 10.0.0.1 does not
B. RTR has a BGP password set but neighbor 10.0.0.5 does not
C. RTR has a BGP password set but neighbor 10.0.0.1 has an incorrect password set
D. RTR has a BGP password set but neighbor 10.0.0.5 has an incorrect password set
E. Neighbor 10.0.0.1 has a BGP password set but RTR does not
F. Neighbor 10.0.0.5 has a BGP password set but RTR does not
答案AD是正确的。自己搭个拓扑,左边R1,右边R2,只要两台路由器就可以了。在R1上设置密码,然后在R2上依次不设密码,设置个错误的密码,然后就能看到debug的结果了。在做无密码的时候,要耐心等一下debug结果,才能看到R1的TCP端口号变化情况。
关于重分布的实验:
不论R2和R3之间是不是以太网口相连,R4回包给R1的时候,都会走R4->R3->R2->R1,不论你在把eigrp重分布到ospf里的时候是否加上metric-type 1这个参数。大家在练习的时候可以看一下R1的路由表,以默认的O E2方式学到的R1路由,就是把包发送给R3。而不是题库里讲到的R1会负载均衡的走R4->R2和R4->R3。要做到负载均衡的话,R4与R2和R3一定要都是串口连接才行。
但是个人认为,考试的时候还是要把metric-type 1这个参数加上,这应该是个考点。
好了,说了这么多希望大家都能顺利在NP改版前,拿到证书。楼主也继续去啃813和832了。
楼主好人一个,谢谢分享。 什么千分传言??楼主 感谢 楼主好人,谢谢分享 楼主战报很给力啊!很有用{:6_267:}{:6_267:} 楼主说的有争议的这些选择题,遇到了吗?遇到了的话按照题库做还是?
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