求助新题库2017.06.27题目251/42问题

sss1080

请问第251题，按视频的答案是A题库更新后仍为C，想问问考过的高手们，这题怎么选好？
QUESTION 251
How does a router handle an incoming packet whose destination network is missing from the Routing
table?
A. it discards the packet.
B. it broadcasts the packet to each network on the router.
C. it routes the packet to the default route.
D. it broadcasts the packet to each interface on the router
Correct Answer: C
Section: part 6


题库第42题答案是BE还是DE呢？谢谢
QUESTION 42
Which two statements about IPv4 multicast traffic are true? (Choose two.)
A. It burdens the source host without affecting remote hosts.
B. It uses a minimum amount of network bandwidth.
C. It is bandwidth-intensive.
D. It simultaneously delivers multiple streams of data.
E. It is the most efficient way to deliver data to multiple receivers.
Correct Answer: BE

陳罐西

Question 228 和 251 都考的是 默认路由的认识
英文 default route 和 the route of last resort 中文都是默认路由 缺省路由的意思
在路由表中没有路由条目的，都会使用缺省路由。

然后是42题 考的知识点是关于组播的认识。度娘一下 就会很清楚了

http://baike.baidu.com/link?url= ... p5FSUlDQBqsWpmrddiu

sss1080

补上还有228题B跟C犹豫
如果找不到对应路由应该就是丢弃封包了吧?
QUESTION 228
When a router is unable to find a known route in the routing table,how dose it handle the pacet?
A. It sends the packet to the next hop address
B. It sends the packet to the gateway of last resort
C. It discards the packet
D. It sends the packet over the route with the best metric
Correct Answer: B
Section: part 5

sss1080

陳罐西 发表于 2017-7-3 09:45
Question 228 和 251 都考的是 默认路由的认识
英文 default route 和 the route of last resort 中文都是 ...

关于228和251问题如果在路由表中找不到路由应该就是连预设路由都没有吧？

陳罐西

sss1080 发表于 2017-7-3 11:50
关于228和251问题如果在路由表中找不到路由应该就是连预设路由都没有吧？

你说的很有道理，他这个题目出的问题有点大
这就考出题者的意图了  哈哈哈

13918347359

我觉得应该是丢弃吧，因为他没说配置了默认路由