How to Use Nmap for Network Scanning in CEH?

Introduction

Nmap is used in every single CEH practical exam — you get 4–6 flags just from proper scanning. Host discovery, port scanning, service version detection, OS fingerprinting, vulnerability scanning — all start with Nmap. Students who master Nmap finish scanning section in under 30 minutes. At Ethical Hacking Training Institute we give you 300+ real network devices daily so you practice every Nmap command exactly like the real exam.

Top 15 Nmap Commands You Must Memorise for CEH

Memorise these commands.

Host Discovery & Ping Sweep Techniques

• nmap -sn → no port scan
• nmap -PE/PP/PM → ICMP types
• nmap -PS80,443 → TCP SYN ping
• nmap -PA21,22 → TCP ACK ping
• nmap -PU53 → UDP ping
• Our lab has 300+ hosts daily

Port Scanning Types – SYN, TCP Connect, UDP, Xmas

SYN scan (-sS) is default & stealthiest. TCP connect (-sT) when no root. UDP scan (-sU) for DNS, SNMP. Xmas/Null/Fin scans (-sX/-sN/-sF) to bypass firewalls. Always combine with -sV for version detection.

Master scan types.

NSE Scripts – Your Secret Weapon

• --script vuln → all vulnerability scripts
• --script smb-os-discovery, http-enum
• --script smb-vuln-ms17-010
• --script=http-title, ssh-auth-methods
• Our lab has 200+ NSE challenges

Firewall & IDS Evasion Techniques

• -f -f → packet fragmentation
• -D RND:10 → decoy scans
• --source-port 53 → spoof source port
• -g 53 → source port 53
• --data-length 100 → add junk data

Timing Templates & Speed Control

• -T0 to -T5 → paranoid to insane
• -T4 most used in exam
• --min-rate, --max-rate
• --scan-delay 5s

Use timing templates.

Output Formats & Scripting

• -oN normal.txt → readable
• -oX xml.xml → for parsing
• -oG grepable.txt → easy grep
• -oA all formats

Conclusion: Become Nmap Expert in 30 Days

Nmap alone gives you 4–6 flags in CEH practical. Join Ethical Hacking Training Institute and get:

• 300+ live network targets daily
• All Nmap commands pre-loaded
• Daily challenges
• Weekend & weekday batches
• 100% placement support

Book free demo — run first Nmap scan in 10 minutes!

Avoid common mistakes.

Frequently Asked Questions

Which Nmap scan is default?

SYN scan (-sS).

Is -sV important?

Yes — version detection mandatory.

Is NSE scripting tested?

Yes — 5–8 questions + flags.

Which timing template for exam?

-T4 — balanced speed.

Is UDP scan slow?

Yes — but required for DNS, SNMP.

Do you provide targets?

Yes — 300+ live devices daily.

Is firewall evasion tested?

Yes — decoy, fragmentation.

Is OS detection accurate?

90% — with -O flag.

Weekend batch covers Nmap?

Yes — full hands-on.

How many commands to learn?

Top 25 — we give cheat sheet.

Is Masscan better?

For speed — we teach both.

Is output format important?

Yes — for reporting.

Do you teach stealth scanning?

Yes — Xmas, Null, FIN scans.

Is Nmap enough for scanning?

95% — rest with NSE.

How to start today?

Book free demo — scan first network in 10 minutes!