关于以下4个layer:
physical, data link, network and transport.
各找一个针对性保护以上每个layer的软件。

physical layer 的软件要到firmware里面去找了，有没有还不一定。这都谁出的题阿？

一老师出的。。。挺无语的，学生们都在学校论坛上暴走“上哪找切”
其他3个layer楼上的朋友知道有哪些针对性的软件吗
题目原题“For each network layers (layers 1-4 from the textbook Hack the Stack), physical, data link,
network and transport, find a software package (not already mentioned in the text book) which
is designed to protect that specific layer and which you would think does this well. At least two
of the packages mentioned should be freely available”

太难了吧……