Full form of DOD is Department of Defense . It is also called OSI Model
Department of Defense model has four layers that are given below :
Process/Application layer :- Application ,presentation , Session Layer
Protocol used :-Telnet,FTP,SNMP,TFTP,SMTP,NFS
Host-to-Host layer:- Transport Layer
Protocol used :- TCP,UDP
Internet layer:- Network Layer Protocol used :- ICMP,ARP,RARP,IP
Network Access Layer:- Data Link layer ,Physical Layer
Protocol used :-Ethernet,Token Ring, Fast Ethernet

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