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Presentation Layer - Data from segments are converted to a more human-friendly format here. Session Layer - Establishes and maintains a session between devices. Uses protocols like TCP and UDP to send and receive data. Transport Layer - Acts as a bridge between the network and session layer. Sender’s and receiver’s IP addresses are added to the header at this layer. Network Layer - Takes care of finding the best (and quickest) way to send the data. Data Link Layer- Makes sure the data is error-free. Physical Layer - Responsible for the actual physical connection between devices. The OSI Model segments network architecture into 7 layers: Application, Presentation, Session, Transport, Network, Datalink, and Physical. The Open Systems Interconnection (OSI) model standardizes the way two or more devices connect with each other. This is important to understand the core functions of Wireshark. I am assuming you are new to networking, so we will go through some basics of the OSI model. While most security tools are CLI based, Wireshark comes with a fantastic user interface. Wireshark is also completely open-source, thanks to the community of network engineers around the world. Most enterprises and government organizations now prefer Wireshark as their standard network analyzer. It can run on all major operating systems. Wireshark was first released in 1998 (and was called Ethereal back then). It lets you dissect your network packets at a microscopic level, giving you in-depth information on individual packets. Wireshark is a network analyzer that lets you see what’s happening on your network. In this article, we will look at it in detail. If you are working professionally, or you wanted to submit the PCAP for the analysis to your seniors, managers, or any others, you cannot simply give the PCAPs and ask them to filter on their own, that doesn’t sound professional.Wireshark is the best network traffic analyzer and packet sniffer around. There would be lots of packets that must have been collected as of now. Now that we have seen the 3-way TCP handshake process and the SSL handshake (sending of the CLIENT and SERVER packets in the Wireshark). Once that is accepted by the server, the server will send the SERVER packet, which consists of their certificates, algorithms, and ciphers. Once established It starts sending the CLIENT HELLO packet and this packet contains a lot of information such as Certificates, cipher, and algorithms that the system is using. Now It uses TCP protocol which guarantees packet delivery and error-free data. 
This ensures that the TCP way handshake is established successfully for further communication. Basically, this is the 3-way TCP Handshake process, where the system sends the SYN Packet flag set to 1 then, the SYN + ACK flag set to 1, Followed by the ACK flag set to 1. Now, this can also be seen on the Wireshark in the Client Hello Packet. Represent that whatever is before the dot would be classified under. Let us take an example, if you wanted to browse then the SNI would be ”. Server Name Indication is one of the important things that every server has. Wireshark comes up with so many options that you can explore, it helps you to analyze which of the SNI (Server Name Indication) is having the largest traffic so that you can filter the TCP session of that captured file. Now, this traffic would be any, if it is flowing from the internet to your system Or system to the internet. Wireshark is the Network analyzer tool that analyzes the traffic that is being captured.
#Wireshark filters software#
Wireshark is used in Information Technology Industries for a while now, it is a free software tool that can perform actions beyond the level. It is so popular and so convenient to use, only if you know what exactly you want to perform. Wireshark is one of the most used tools by Cyber Security Experts around the Globe.
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