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What is Server Message Block (SMB)?
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Known as a response-request protocol, the SMB protocol is one of the most common methods used for network communications. In this model, the client sends an SMB request to the server to initiate the connection.
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Oct 25, 2024 · How SMB works. SMB is a request-response protocol. In this setup, the client (like your computer) sends an SMB request to the server, which then replies with an SMB response. Here’s a closer look at how it plays out: Initiation request: the client sends an SMB request to the server to establish a connection.
Server Message Block (SMB) enables file sharing, printer sharing, network browsing, and inter-process communication (through named pipes) over a computer network. SMB serves as the basis for Microsoft's Distributed File System implementation. SMB relies on the TCP and IP protocols for transport.
Sep 23, 2020 · SMB (Server Message Block) is a client/server protocol that governs access to files and whole directories, as well as other network resources like printers, routers or interfaces open to the network. Information exchange between the different processes of a system (also known as inter-process communication) can be handled based on the SMB protocol.
- SMB Protocol Dialects
- Understanding SMB Protocol Services
- Various SMB Protocol Implementations
- Security Considerations For The SMB Protocol
- Conclusion
The SMB protocol has evolved over time, and its various versions are commonly referred to as dialects. Microsoft continues to work hard to improve SMB with each new version of Windows. The following table shows the SMB dialects used in various Windows versions: As you can see in the table, Windows 11 and Windows Server 2022 still use the SMB 3.1.1 ...
As a client–server protocol, SMB requires a server service (LanmanServer) and a client service (LanmanWorkstation). Every Windows computer, whether it is running a server OS (like Server 2016 or Server 2019) or a client OS (like Windows 10 or Windows 11), has both the LanmanServer and LanmanWorkstation services. You can check the status of both ser...
The SMB protocol is one of the most popular protocols for file and resource sharing over networks. And not only with Windows—it has also been widely adopted by other operating systems, such as Linux/Unix and macOS. Below are some of the most popular implementations of the SMB protocol: 1. CIFS—The common internet file system (CIFS) is Microsoft's i...
Remember the infamous WannaCry and Petya attacks and the EternalBlue exploit? They all lead back to an SMB 1.0 vulnerability, one way or another. Therefore, it is vital to cover some SMB features that you can use to secure SMB communication in your network. We will cover the following best practices to secure SMB communication: 1. Explicitly disabl...
I hope that by reading this article, you will have a good understanding of how the SMB protocol works and the different ways to protect SMB communication in your network. This is not a comprehensive security checklist, but it gives a fair enough idea about a few SMB security measures. In my next post, I will clear up some confusion about the SMB po...
Nov 29, 2022 · Server message block or SMB is a communication protocol designed to provide shared access to data, files, devices, and other assets running on an interconnected network. This article explains the functioning of SMB, its key features, and applications.
Feb 13, 2024 · At its core, Server Message Block (SMB) functions as a request-response or client-server protocol. This means that a client (user) sends requests to a server (networked device) to perform operations like opening, reading, writing, or closing files.
