March 2018
Intermediate to advanced
626 pages
17h 32m
English
book
Network Analysis Using Wireshark 2 Cookbook - Second Edition
by Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss
Content preview from Network Analysis Using Wireshark 2 Cookbook - Second Edition
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POP3
POP3 is an application layer protocol used by mail clients to retrieve email messages from the server. A typical POP3 session will look like the following screenshot:
It has the following steps:
- The client opens a TCP connection to the server.
- The server sends an OK message to the client (OK Messaging Multiplexor).
- The user sends the username and password.
- The protocol operations begin. NOOP (no operation) is a message sent to keep the connection open, STAT (status) is sent from the client to the server to query the message status. The server answers with the number of messages and their total size (in packet 1042, OK 0 0 means no messages ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.