104.4 Q461

rocafella

Computer 1 is consoles into switch A. Telnet connections and pings run from the command prompt on switch A fail. Which of the following could cause this problem?

                               
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A. switch A does not have a cdp entry for switch B or router JAX
B. switch A does not have an IP address
C. port 1 on switch A should be an access port rather than a trunk port
D. switch A is not directly connected to router JAX
E. switch A does not have a default gateway assigned

题库上的答案是

Answer: E---

Explanation/Reference:图中vlan1没有配置IP地址，这可能管理vlan不是vlan1，别的vlan没有显示出来。题目说ping和telnet都失败，至少说明交换机已经配置了IP地址。原因就是没有配置默认网关了
而9tut的答案是Answer: B

---ExplanationIt’s a hard question to answer although it looks simple! From the output above we are sure that switch A does not have an IP address (on both Fa0/1 and on VLAN 1) so it can not ping or telnet to any other device -> B is correct.Another answer seems to be correct is answer E – switch A does not have a default gateway assigned. We know that Switch A can not telnet to other device outside its subnet without having a default gateway. But the question only says “Telnet connections and pings run from the command prompt on switch A fail” without telling us where Switch A is trying to telnet or ping to. If it tries to connect to the outside network then E is correct. If it only want to connect to a device inside its subnet then a default gateway is not necessary.So the best answer for this question is B!
请高手指教！！

Lion

答案里说得很清楚了，如果A没有配置IP，那题目怎么会说“Telnet connections and pings run from the command prompt on switch A fail”，你总不会输入#ping switchA 来ping设备吧

rocafella

Lion 发表于 2012-4-4 11:46

                               
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答案里说得很清楚了，如果A没有配置IP，那题目怎么会说“Telnet connections and pings run from the comma ...

我认为这句话的意思是
“从SW1上的命令行中ping其他设备”，这样一来SW1就可以没有IP了 而且图上也说SW1的F0/1也没有IP

Flynnlan

用远程telnet的话、、要么用管理vlan IP、、要么用line vty、、、要么用default gateway、、、而且二层交换机端口不用设IP，也设置不了IP吧、、所以我觉得还是E答案比较合理、、

Lion

rocafella 发表于 2012-4-4 11:53

                               
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我认为这句话的意思是
“从SW1上的命令行中ping其他设备”，这样一来SW1就可以没有IP了 而且图上也说SW1 ...

你说的对，刚才没认真看题目。。不过SW1的F0/1没有IP是正常的，二层端口不能配置IP

刚刚在PT上做了下实验，交换机上不配置IP是无法ping和telnet的，而不配置默认网关只配置IP是可以的，所以我想题库的答案应该是错的。。。

坐等版本定夺。。。

jianrujiajing

题库答案应该是错的。“Telnet connections and pings run from the command prompt on switch A fail.”既然是道排错题，为何我们要去假设已经为另外的管理VLAN配置了IP地址呢？可不可以出现未配置IP地址的情况呢，当然是允许出现的，而且根据题目中的信息，明显没有看到配置IP地址。而且在现实世界中是完全有可能出现管理员忘配IP地址的情况。
如果在交换机A上Ping同一网段内的设备，也可以不需要为其配置网关。题目中的图也表明路由器没有连接其它的网段，恰好不谋而合。
综上所述，选择A得分机率更高。

grace123

希望知道确切答案

ss.xz

這題我也需要知道