... IP. The commandping domain orping ipaddress6 LESSON 5 – SYSTEM IDENTIFICATION LESSON 5SYSTEM IDENTIFICATIONWhat ports are open? Using a web search engine, can you match these ports with theservices ... http://www.dnsstuff.com/Ping:http://www.freesoft.org/CIE/Topics/53.htm12 LESSON 5 – SYSTEM IDENTIFICATION “License for Use” InformationThe following lessons and workbooks are open and publicly available under ... thoseports:Active Connections7 LESSON 5 – SYSTEM IDENTIFICATIONContributorsChuck Truett, ISECOMMarta Barceló, ISECOMKim Truett, ISECOMPete Herzog, ISECOM4 LESSON 5 – SYSTEM IDENTIFICATION...