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Need help with these 3 questions as soon as possible based on linux

2. 3. 4. By default, tcpdump will capture how many bytes of a packet? What switch can be utilized with topdump to capture the entire packet? How can you see what options are available for the topdump command?

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Answer #1

Answer 2
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By default most newer implementations of tcpdump will capture 65535 bytes

Answer 3
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tcpdump -i eth0 <protocol name> #eg tcp , udp , ftp etc
or
tcpdump -i eth0 port <port no> # 21 ftp , 80 http, 25 smtp etc

Answer 4
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man tcpdump
or
tcpdump --help

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