In example, consider ARP; it is a two-step process that consists of a request and a response. Little thought was...
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given at the time of the development of ARP that someone may actually send unsolicited ARP responses for the purpose of ARP poisoning. Other protocols and applications of TCP/IP also have security issues, such as ICMP, RIP, FTP, SNMP and Telnet.
For more information, view this tutorial on understanding TCP/IP from FreeSkills.com.
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