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Defense
  • Defense
  • Getting Started
    • Introductory Networking
      • Introduction
      • The OSI Model: An Overview
        • Answers
      • Encapsulation
        • Answers
      • The TCP/IP Model
        • Answers
      • Wireshark
        • Answers
      • Networking Tools - Ping
        • Answers
      • Networking Tools - Traceroute
        • Answers
      • Networking Tools - WHOIS
        • Answers
      • Networking Tools Dig
        • Answers
      • Further Reading
    • Network Services
      • Understanding SMB
        • Answers
      • Enumerating SMB
        • Answers
        • Untitled
      • Exploiting SMB
        • Answers
        • Untitled
      • Understanding Telnet
        • Answers
      • Enumerating Telnet
        • Answers
        • Untitled
      • Exploiting Telnet
        • Answers
        • Untitled
      • Understanding FTP
        • Answers
      • Enumerating FTP
        • Answers
        • Untitled
      • Exploiting FTP
        • Answers
        • Untitled
      • Expanding Your Knowledge
    • Network Services 2
      • Understanding NFS
        • Answers
      • Enumerating NFS
        • Answers
        • Untitled
      • Exploiting NFS
        • Answers
        • Untitled
      • Understanding SMTP
        • Answers
      • Enumerating SMTP
        • Answers
        • Untitled
      • Exploiting SMTP
        • Answers
        • Untitled
      • Understanding MYSQL
        • Answers
      • Enumerating MYSQL
        • Answers
        • Untitled
      • Exploiting MYSQL
        • Answers
        • Untitled
      • Further Learning
    • Wireshark 101
      • Introduction
      • Installation
      • Wireshark Overview
      • Collection Methods
      • Filtering Packets
      • Packet Dissection
      • ARP Traffic
        • Answers
      • ICMP Overview
        • Answers
      • TCP Traffic
      • DNS Traffic
        • Answers
      • HTTP Traffic
        • Answers
      • HTTPS Traffic
        • Answers
      • Analyzing Exploit PCAPS
      • Conclusion
    • !Intro to Windows
    • Active Directory Basics
      • Introduction
      • Physical Active Directory
        • Answers
      • The Forest
        • Answers
      • Users + Groups
        • Answers
      • Trusts + Policies
        • Answers
      • Active Directory Domain Services + Authentication
        • Answers
      • AD in the Cloud
        • Answers
      • Hands-On Lab
        • Answers
        • Untitled
      • Conclusion
    • !Windows Core Processes
    • !SysInternals
  • Threat and Vulnerability Management
    • !Nessus
      • Introduction
      • Installation
      • !Navigation and Scans
        • Answers
      • !Scanning
      • !Scanning a Web Application
    • MITRE
      • Introduction to Mitre
      • Basic Terminology
      • ATT&CK Framework
        • Answers
      • CAR Knowledge Base
        • Answers
      • Shield Active Defense
        • Answers
      • ATT&CK EmulationPlans
        • Answers
      • ATT&CK® and Threat Intelligence
        • Answers
      • Conclusion
    • Yara
      • Introduction
      • What is Yara?
        • Answers
      • Installing Yara (Ubuntu/Debian & Windows)
      • Deploy
      • Introduction to Yara Rules
      • Expanding on Yara Rules
      • Yara Modules
      • Other Tools and Yara
      • Using LOKI and its Yara rule set
        • Answers
        • Untitled
      • Creating Yara rules with yarGen
        • Answers
        • Untitled
      • Valhalla
        • Answers
      • Conclusion
    • Intro to ISAC
      • Introduction
      • Basic Terminology
      • What is Threat Intelligence?
      • What are ISACs?
      • Using Threat Connect to create a Threat Intel dashboard
      • Introduction to AlienVault OTX
      • Using OTX to gather Threat Intelligence
      • Creating IOCs
      • Investigating IOCs
        • Answers
    • Zero Logon
      • The Zero Day Angle
      • Impacket Installation
      • The Proof of Concept
        • Answers
      • Lab it up!
        • Answers
        • Untitled
    • !OpenVAS
    • !MISP
  • Security Operations and Monitoring
    • Splunk
    • Windows Event Logs
    • Sysmon
    • Suricata
    • Osquery
    • Graylog
    • OpenEDR
  • Threat Emulation
    • Attacktive Directory
    • Attacking Kerberos
    • Atomic Red Team
  • Incident Response and Forensics
    • Volatility
    • Forensics
    • Investigating Windows
    • Windows Forensics
    • Redline
    • Autopsy
  • Malware Analysis and Reverse Engineering
    • History of Malware
    • Malware Introductory
    • Researching
    • Strings
    • Basic Malware RE
    • REMnux: The Redux
    • Reversing .NET Apps
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  1. Getting Started
  2. Network Services

Understanding SMB

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Last updated 4 years ago

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What is SMB?

SMB - Server Message Block Protocol - is a client-server communication protocol used for sharing access to files, printers, serial ports and other resources on a network. []

Servers make file systems and other resources (printers, named pipes, APIs) available to clients on the network. Client computers may have their own hard disks, but they also want access to the shared file systems and printers on the servers.

The SMB protocol is known as a response-request protocol, meaning that it transmits multiple messages between the client and server to establish a connection. Clients connect to servers using TCP/IP (actually NetBIOS over TCP/IP as specified in RFC1001 and RFC1002), NetBEUI or IPX/SPX.

How does SMB work?

Once they have established a connection, clients can then send commands (SMBs) to the server that allow them to access shares, open files, read and write files, and generally do all the sort of things that you want to do with a file system. However, in the case of SMB, these things are done over the network.

What runs SMB?

Microsoft Windows operating systems since Windows 95 have included client and server SMB protocol support. Samba, an open source server that supports the SMB protocol, was released for Unix systems.

What does SMB stand for?

What type of protocol is SMB?

What do clients connect to servers using?

What systems does Samba run on?

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