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# Examine the contents of the ARP cache by using the command: <b><code><span style="color:#3366CC;font-size:1.2em;">arp</span></code></b>
# Check the contents of the cache again by using the command: <b><code><span style="color:#3366CC;font-size:1.2em;">arp -n</span></code></b>
# What was the difference in output? For what other command did the option '''-n''' have a similar effect?<br>{| width="40%" align="right" cellpadding="10"
# On your CentOS host execute the command: <b><code><span style="color:#3366CC;font-size:1.2em;">netstat -at</span></code></b>
# This command will list all active TCP ports. Note the state of your ports.