Refer to the exhibit． What is the most appropriate summarization for these routes?
【正确答案】
B
【答案解析】考点分析：这道题考的是子网的聚合。
10．0． 0 0 0 0 0 0 0 0 ．0
10．0． 0 0 0 0 0 0 0 1 ．0
10．0． 0 0 0 0 0 0 1 0 ．0
10．0． 0 0 0 0 0 0 1 0 ．0
10．0． 0 0 0 0 0 0 0 0 ．0
10．0． 0 0 0 0 0 0 0 1 ．0
10．0． 0 0 0 0 0 0 1 0 ．0
10．0． 0 0 0 0 0 0 1 0 ．0