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DOD Model 4 года назад


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DOD Model

DOD is a Condensed Version of OSI Model and below are the four layers Process / Application Layer ======================= Application : All important applications like FTP and HTTP Presentation Layer : how data is presented and data formatting Session Layer : like Half Duplex or Full-Duplex Communication Host to Host Layer ================ TCP and UDP will cover under Host to Host Layer TCP is Connection-Oriented and Reliable UDP is Connection less oriented and less reliable Internet Layer ============ IP--Internet Protocol is a 32 bit binary number divided into 4 octets ICMP : Ping works through ICMP which is used to check the physical and logical connectivity ARP : used to resolve IP to MAC address RARP : used to resolved MAC to IP Proxy ARP : used to find a destination host which is not in the routing table Network Access Layer: ================== Physical Layer : Hub is an example and data is transmitted in the form of bits Data Link Layer : Switch is an example and data is transmitted in the form of frames

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