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The osi (open systems interconnection) model is a conceptual framework used to describe the functions of a networking system. A comprehensive overview of the seven layers of the osi model, including the protocols and devices associated with each layer. It covers the purpose and responsibilities of each layer, from the physical transmission of data to the application-level services. The document also discusses the process of data encapsulation, which is crucial for understanding how data is transmitted across a network. This resource is valuable for students, network administrators, and anyone interested in understanding the fundamental principles of computer networking.
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What does OSI stand for? ✔✔Open Systems Interconnect 7 Layers (Top to bottom) of the OSI Model ✔✔Application Presentation Session Transport Network Data Link Physical Layer of the OSI model that enables services to request network services. This layer uses protocols like HTTP, FTP, SMTP, IMAP and others. Proxies and firewalls also work on this layer. ✔✔Application Layer
Layer of the OSI model that translates data into an intermediate form that both clients and servers can process. Encryption, compression, character sets, multimedia formats and more exist at this layer. Proxies and firewalls also work on this layer. ✔✔Presentation Layer Layer of the OSI model that establishes and controls data communication between two different devices. Regulates when each device can send and how much it can send at once. TCP and UDP port numbers exist at this layer. Firewalls also work on this layer. ✔✔Session Layer Layer of the OSI model that performs the actual establishment, maintenance, and tear-down of the connection. Can divide long communications into smaller segments, including error recognition and correction, and data receipt acknowledgments. TCP and UDP protocols work at this layer. Packet filtering routers, multi-layer switches, and firewalls work at this layer. ✔✔Transport Layer Layer of the OSI model that adds logical addressing and chooses the best route. IP, ICMP, IGMP exist at this layer. Routers, multi-layer switches, and firewalls work at this layer. ✔✔Network Layer
Encryption, compression, character sets, multimedia formats, MIME types, codecs... ✔✔Presentation Layer (protocols) TCP and UDP port numbers ✔✔Session Layer (protocols) TCP and UPD protocols ✔✔Transport Layer (protocols) IP, ICMP, IGMP ✔✔Network Layer (protocols) MAC Addresses, Ethernet, token ring, frame relay, PPP, HDLC, wireless access protocol, ATM, X.25... ✔✔Data Link Layer (protocols) Cabling, connectors, antennas, transceivers, baseband, broadband, signaling types... ✔✔Physical Layer (protocols) Proxies, firewalls ✔✔Application Layer (devices) Proxies, firewalls ✔✔Presentation Layer (devices)
Firewalls ✔✔Session Layer (devices) Firewalls ✔✔Transport Layer (devices) Multi-layer switches, routers, firewalls ✔✔Network Layer (devices) Switches, bridges, and access points ✔✔Data Link Layer (devices) Hubs, repeaters, patch panels, cables, and network cards. ✔✔Physical Layer (devices)
