Netwrok Security Testing for Absolute Beginners

This blog covers some tools for Network/Security Testing.

Packet Crafting - hping, ngrep, sendip, scapy
Packet Replay - tcpreplay,tcpreplay-edit,tcpdump
Scanning - nmap,nc, metasploit,nessus
Fuzzing - metasploit, nikto,nessus, spike,radamsa,webfuzz
Stats - dstat,ifstat,iftop,ntop
Web - wget, curl, ab
Debugging - ping,netstat,tracert, ngrep
Benchmarking - ab,iperf,netperf
SNMP - snmpwalk
NTP Suite

For CLI one liners refer below presentation
http://disects.com/whitepapers/NetworkSecurityTestingTools.pdf