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CYBER HUB
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CYBER HUB
@SOCDefender
Cybersecurity Content | SOC | Ethical Hacking | Pentesting + Blue Team🛡️
192.168.10.2 参加日 Mart 2023
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7 hands-on GitHub projects to build cybersecurity skills today
• Splunk: lnkd.in/d2YR_wYA
• Windows Forensics: lnkd.in/ds6RT2Yf
• Log Analysis: lnkd.in/dhAZvesz
• Active Directory: lnkd.in/d5uPB29b
• Malware Analysis: lnkd.in/dfq-u4HS
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✅ Answer: B) who
who → Shows all currently logged-in users (active sessions)
whoami → Shows only your username
id → Displays UID/GID info
userset → Not a valid Linux
command
👉 So for real-time logged-in users → use who
Abdulkadir | Cybersecurity@cyber_razz
LINUX KNOWLEDGE CHECKPOINT Which command is used to display currently logged-in users on a Linux system? A. whoami B. who C. id D. userset
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EDR (Endpoint Detection & Response) continuously monitors endpoints, uses AI & behavior analysis to detect threats, investigates root cause, and responds in real time—isolating devices, stopping attacks, and enabling recovery. It’s frontline defense against modern cyber threats.
LetsDefend@LetsDefendIO
EDR
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✅ Answer: B) 172.20.15.10
Private IP ranges:
10.0.0.0 – 10.255.255.255
172.16.0.0 – 172.31.255.255
192.168.0.0 – 192.168.255.255
Why others are wrong:
A) 8.8.8.8 → Public (Google DNS)
C) 192.0.2.1 → Reserved (test network)
D) 150.10.5.5 → Public IP
Abdulkadir | Cybersecurity@cyber_razz
NETWORKING KNOWLEDGE CHECKPOINT Which of the following IP addresses is a private IP address? A. 8.8.8.8 B. 172.20.15.10 C. 192.0.2.1 D. 150.10.5.5
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Traffic analysis (side-channels). Encryption hides content, not metadata.
ISP still sees packet sizes, timing, burst patterns, total bytes
4K streaming has a distinct bitrate + chunk cadence (DASH/HLS)
TLS/VPN hides payload, but flow patterns remain visible
Cyber_Racheal@CyberRacheal
Interviewer: When you're using a VPN, your ISP can still see how much data you’re using, but they can't see what you’re doing. However, if you're watching a 4K movie on Netflix over a VPN, a sophisticated ISP can still guess exactly what you're watching just by looking at the "shape" of your traffic. How is that possible if the data is fully encrypted?
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⚠️ Don’t type that in your Linux terminal.
:(){ :|:& };: is the fork bomb.
It creates infinite processes that recursively spawn themselves, quickly consuming CPU and RAM until the system freezes or crashes.
A classic Linux prank… and a great reminder: never run unknown command
Abdulkadir | Cybersecurity@cyber_razz
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🚨 Linux server slow due to high CPU?
1️⃣ Check usage: top / htop
2️⃣ Find culprit: ps aux --sort=-%cpu
3️⃣ Investigate logs: journalctl -xe
4️⃣ Restart service or kill process: kill -9 PID
5️⃣ Optimize app or limit CPU (nice, cpulimit).
Identify → Fix → Prevent. #Linux #SysAdmin
Nandkishor@devops_nk
Linux Server is slow due to high CPU utilization. How will you fix it?
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👉 𝗜𝗦𝗦𝗔𝗣
𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟭:
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𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟮:
lnkd.in/dysJm8HD
𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟯:
lnkd.in/dEQtURvp
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𝗖𝗜𝗦𝗦𝗣
𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟭:
lnkd.in/dM8AcW-D
𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟮:
lnkd.in/dtybAtuF
𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟯:
lnkd.in/dRixx3Ff
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FREE EXAM PRACTICE RESOURCES
👉 𝗖𝗖𝗦𝗣
𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟭:
lnkd.in/dgRQz_DW
𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟮:
lnkd.in/dRWXqwgF
𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗘𝘅𝗮𝗺 𝟯:
lnkd.in/dGpnFw5n
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