Anubhav Singh’s Post

OSI MODEL- OSI stands for Open Systems Interconnection. It has 7 layers Physical layer, Data Link layer, Network layer, Transport layer, Session layer, Presentation layer, and Application layer. Each layer performs its task independently. It was developed in 1984 by the International Organization for Standardization (ISO). TCP/IP MODEL- TCP/IP stands for Transmission Control Protocol/Internet Protocol. It has 4 layers named as Physical layer, Network layer, Transport layer, and Application layer. It also can be used as a communications protocol in a private computer network. It was designed by Vint Cerf and Bob Kahn in the 1970s.

I did some reading today. I got to know how Network models operate as well as the two major types (TCP/IP & OSI). 😅 Under TCP/IP model, we have; * Application layer * Transport layer * Internet layer * Network layer Under OSI model, we have; * Application layer * Presentation layer * Session layer * Transport layer * Network layer * Data link layer * Physical layer Quick question: If the transport layer provides the means for transmitting data between two connected parties, what does the network layer do? #ITessentials #cisconetworkingacademy

How is data sent over the internet? What does that have to do with the OSI model? How does TCP/IP fit into this?    7 Layers in the OSI model are:  1. Physical Layer  2. Data Link Layer  3. Network Layer  4. Transport Layer  5. Session Layer  6. Presentation Layer  7. Application Layer

How is data sent over the internet? What does that have to do with the OSI model? How does TCP/IP fit into this? 7 Layers in the OSI model are: 1. Physical Layer 2. Data Link Layer 3. Network Layer 4. Transport Layer 5. Session Layer 6. Presentation Layer 7. Application Layer

It’s a great tool for troubleshooting and improving network security, and I find it fascinating how everything depends on these layers working together. Reposting it serves as a helpful reminder of its importance in the world of networking.

💠Understanding OSPF LSDB Exchange: Key Concepts💠 When a data link first becomes active, OSPF routers initiate communication by exchanging Hello messages to establish neighbor relationships. Following this, they share topology information through the remaining four OSPF message types. The accompanying diagram illustrates this process between two routers, showcasing the message flow and the corresponding neighbor state on each router. ❗Each OSPF router maintains a state machine for each neighbor, which can be viewed using the "show ip ospf neighbor" command. These neighbor states evolve as the routers exchange messages, eventually reaching a "Full" state, indicating full adjacency and completion of the process.

If the transport layer provides the means of transmitting data, then the network layer simply provides the routes/path for data transmission. Simple analogy: Transport layer = the vehicle Network layer = the path.

The OSI model has seven layers Physical – Transmits raw bits over physical media (e.g., cables, Wi-Fi). Data Link – Manages data transfer between adjacent nodes; handles error detection. Network – Routes packets across networks (e.g., IP). Transport – Ensures reliable data transfer with error checking (e.g., TCP, UDP). Session – Manages sessions and connections between applications. Presentation – Translates data formats, handles encryption and compression. Application – Interfaces with end-user applications (e.g., HTTP, FTP, SMTP). Each layer has a distinct function, enabling effective communication and interoperability

Yesterday's continuation TCP/IP Protocol Suite: Here Protocol Data Unit(PDU): Protocol Data Units(PDU's) are named according to the protocols of the TCP/IP suite:data,segment,packet,frame and bits. Here we go with different layer with its specification. Application layer-------->data Transport layer -------->Segment Networking layer -------->packet(header) Data Link Layer -------->Frame Physical Layer -------->Bits #embedded #protocols #TCP/IP

How is data sent over the internet? What does that have to do with the OSI model? How does TCP/IP fit into this? 7 Layers in the OSI model are: 1. Physical Layer 2. Data Link Layer 3. Network Layer 4. Transport Layer 5. Session Layer 6. Presentation Layer 7. Application Layer --- by ByteByteGo