EIGRP performs automatic summarization at network boundaries. What administrative
distance is given to these EIGRP summary routes?
A.
1
B.
90
C.
95
D.
0
E.
5
F.
170
G.
255
H.
None of the other alternatives apply
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Wrong. Correct answer is 90. Automatic summarization does not mean route redistribution and by network boundaries it’s implied classfull network boundary . EIGRP does not change the Administrative distance for route summary. Internal route 90 external route 170.
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Its talking about the summary route, when EIGRP summaries at classful boundaries, it creates a connected subnet for the classful network that goes to null0, this subnet has an administrative distance of 5. The reasoning for this is that if someone sends a packet to the summarized route, ie… ping 10.1.0.0/16… the router will discard this route as it will match the connected route with administrative distance of 5 that goes to null0. This it so prevent loops.
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