某文件系统文件存储采用文件索引节点法。每个文件索引节点中有8个地址项，每个地址项大小为4字节，其中5个地址项为直接地址索引，2个地址项是一级间接地址索引，1个地址项是二级间接地址索引。磁盘索引块和磁盘数据块大小均为1KB。若要访问iclsClient.dll文件的逻辑块号分别为1、518，则系统应分别采用()
- A.直接地址索引和直接地址索
- B.直接地址索引和一级间接地址索引
- C.直接地址索引和二级间接地址索
- D.一级间接地址索引和二级间接地址索引
正确答案及解析
正确答案
解析
直接地址索引有5个地址项，对应逻辑块号0-4。
一级间接索引有2个地址项，每个地址项对应1Kb/4B=256个物理块，对应逻辑块号范围是5-516。
二级间接索引有一个地址项，对应256×256=65536个物理块，对应逻辑块号范围是517以上。
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