《Operating System Concepts》學習第 55 天，p606-p625 總結，總計 20 頁。

一、技術總結

1.remote file system

(1)ftp

允許匿名訪問(anonymous access)或者認證訪問(authenticated access)。

(2)Distributed File System(DFS)

(3)world wide web(www)

2.NFS

Network File System(NFS)——A common network file system used by UNIX, Linux, and other operating systems to share files across a network。

3.four-layered model of security

(1)physical

(2)network

(3)operating system

(4)application

二、英語總結(生詞：1)

1.resiliency

(1)resilience: re-("back") + salire("to jump, leap")

u. resilience literally means to jump back. the ability to recover from difficulty(恢復力)，主要用在英式英語中。

(2)resiliency: resilience + -cy

意思和 resilience 一樣，主要用在美式英語中。

(3)示例

Although some networks have built-in resiliency, including multiple paths between hosts, many do not. Any single failure can thus interrupt the flow of DFS commands.(《Operating System Concepts》第 608 頁)。

關于英語的注解同步更新匯總到 https://github.com/codists/English-In-CS-Books 倉庫。

三、其它

今天沒有什么想說的。

四、參考資料

1. 編程

(1) Abraham Silberschatz，Peter Baer Galvin，Greg Gagne《Operating System Concepts》：https://book.douban.com/subject/30272539/

2. 英語

(1) Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

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