Beginners and intermediate system administrators will benefit most from this article; the explanations and examples assume you can handle most beginner-level system admin concepts.
初学者和中级系统管理员将从本文获益最多；解说和示例假设您可以运用大部分初学者级别的系统管理概念。
The network layer, however, provides a hop-by-hop protocol and is used on the two end systems and every intermediate system.
但是网络层提供跳跃点到跳跃点的协议，所有端系统和中间系统都需要使用。
The network layer, however, provides a hop-by-hop protocol and is used on the two end systems and every intermediate system.
但是网络层提供跳跃点到跳跃点的协议，所有端系统和中间系统都需要使用。
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