单选题Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（）A data link layerB application layerC access layerD session layerE network layer
单选题
Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（）
A
data link layer
B
application layer
C
access layer
D
session layer
E
network layer
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Refer to the exhibit. On the basis of the output, what two conclusions can be reached?() A. The default administrative distance has been changed.B. IS - IS is not enabled.C. Three physical interfaces are taking part in integrated IS - IS.D. IS - IS is not redistributing any oth er routing protocols.E. There are two neighboring routers sending IS - IS routing information.F. Address summarization is configured.
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Refer to the exhibit. Which subnet mask will place all hosts on Network B in the same subnet with the least amount of wasted addresses?() A.255.255.255.0B.255.255.254.0C.255.255.252.0D.255.255.248.0
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