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Question of the day 08/09, Cybersecurity Edition

  • September 8, 2022
  • 4 comments
  • 36 views
marcofabbri
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Day 7. 

What is missing from a half-open scan?

  • FIN
  • SYN-ACK
  • ACK
  • SYN
  • RST

Best answer by JMeixner

ACK (the last ACK)

Backups are like pizza, I love them. | Linkedin: @marco-fabbri-it

    4 comments

    JMeixner
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    • JMeixner
    • On the path to Greatness
    • Answer
    • September 8, 2022

    ACK (the last ACK)

    Jochen (Joe) Meixner | Veeam Vanguard 2024 | Veeam Legend 2021 - 2024 | Veeam Certified Architect (VMCA) | Veeam Certified Engineer (VMCE) | LinkedIn: https://www.linkedin.com/in/jochen-meixner | X: @JoMeix | BlueSky: @jmeixner.bsky.social
      Link State
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      • Link State
      • Veeam Legend
      • September 8, 2022
      • SYN-ACK
      Veeam: VMCA | VMCE | VMXP | Veeam Legend - Microsoft: MVP | MCITP | MCP | MCSA | 2008 R2 | 2012R2 | 2016 | MCSE Core Infrastructure | MCSE Cloud Platform - Azure: AZ900 | AZ104| AZ500|AZ305 - AWS Cloud Practitioner - VMWare: VCP-DCV Vsphere 7.x - Cisco: CCNA (Expired) | ‪@linkstate.bsky.social‬
        Chris.Childerhose
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        • Chris.Childerhose
        • Veeam Legend, Veeam Vanguard
        • September 8, 2022

        ACK

        Chris Childerhose (Enterprise Architect) - VMCE+ | VMCA | VMCE | VMCE-SP | Veeam Vanguard 8* | Veeam Legend 5* | VUG Canada Leader | vExpert 7* | Toronto VMUG Leader | VCAP-DCV/VCP-DCV/VCP-VVF | Object First Ace | Cisco Champion | Twitter: @cchilderhose | Blog Site – https://just-virtualization.tech
          marcofabbri
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          • marcofabbri
          • Author
          • On the path to Greatness
          • September 9, 2022

          In an half-scan, what is missing is last ACK.

          It’s used to avoid logging on scanned device by interrupting TCP handshake.

          On nmap is “-sS” and it’s the default scan.

          Backups are like pizza, I love them. | Linkedin: @marco-fabbri-it
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