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The OSI Model Explained What Is this OSI Model? The OSI model (Open System Interconnect) is a theoretical stack of 7 layers that can be used as a reference to understand how a network operates. The model was introduced to standardize networks in a way that allowed multi-vendor systems, prior to this you would only be able to have a one vendor network as the devices could not communicate with other vendor devices. The Layers Application (layer 7) This layer is where the application and user communicates. Application specific protocols are used here such as SMTP (simple mail transfer protocol) for sending emails from Outlook. Presentation (layer 6) This layer formats the data in a way that the receiving application can understand it. This layer is also able to encrypt and decrypt date if needed. Session (layer 5) This layer is responsible for establishing and terminating of connections between devices. Transport (layer 4) The transport layer of OSI Model is used for error handling and sequencing to unsure no data is lost. This layer also adds source and destination port numbers Network (layer 3) The network layer handles IP address routing. At this stage of the OSI model the source and destination IP address is added to the data. Data Link (layer 2) At this layer the physical address (MAC Address) is added to the data, this includes the source and destination MAC address. Physical (layer 1) The physical layer is the lowest layer of the OSI model. Its key responsibility is to carry the data across the physical hardware such as an Ethernet cable to the destination. http://www.certbros.com/featured/osi-model-explained/ This video is designed to give a basic and general overview of the OSI model. Its aim is to simplify the concept to make it easier to understand. Do you Even CertBros? http://www.certbros.com Subscribe: https://goo.gl/l999wu Twitter: https://twitter.com/certbros
When your browser tries to load youtube.com, how does it know where to contact YouTube's web servers? This video explains the basics of the Domain Name System, an application layer protocol that serves as the address book of the internet.
Introduction, Network Topology, Physical Medium, Switches, SONET/SDH, Fiber Optic Components, Routing and Wavelength Assignment, Token Based Mac, Data Link Protocols, Error Control, Stop and Wait Protocol, Ethernet - CSMA/CD, Modern Ethernet, Local Internetworking, Cellular Networks, Wireless Network, ATM : Asynchronous Transfer Mode, ATM Signaling, Routing and LAN Emulation, IP version 4, IP Version 6 and Mobile IP, TCP, security. Lectures Lecture -1 Emergence of Networks & Reference Models Lecture - 2 Network Topology Lecture - 3 Physical Medium - I Lecture - 4 Physical Medium - II Lecture -5 Multiplexing (Sharing a Medium) Lecture - 6 Telecom Networks Lecture - 7 Switches - I Lecture - 8 Pocket Switches Lecture - 9 SONET/SDH Lecture - 10 Fiber Optic Components Lecture - 11 Routing and Wavelength Assignment Lecture - 12 Protection and Restoration Lecture - 13 Multiple Access Lecture - 14 Token Based Mac Lecture - 15 Data Link Protocols Lecture - 16 Error Control Lecture - 17 Stop & Wait Protocol Lecture - 18 Satellite Communication Lecture - 19 Ethernet - CSMA/CD Lecture - 20 Modern Ethernet Lecture - 21 Local Internetworking Lecture - 22 Cellular Networks Lecture - 23 Wireless Network Lecture - 24 ATM : Asynchronous Transfer Mode Lecture - 25 ATM Signaling, Routing and LAN Emulation Lecture - 26 Introduction to Routing Lecture - 27 RIP - Distance Vector Routing Lecture 28 - IP version 4 Lecture - 29 IP Version 6 & Mobile IP Lecture - 30 UDP & Client Server Lecture - 31 TCP Lecture - 32 IP Multicasting Lecture - 33 DHCP and ICMP Lecture - 34 DNS & Directory Lecture - 35 Congestion Control Lecture - 36 QOS & Multimedia Lecture - 37 Network Management Lecture - 38 Security Lecture - 39 FTP - SMTP Lecture - 40 HTTP
In this video we will talk about public and private IP addresses. The use of private and public IP address. Translation between private IP address and public IP address using NAT or PAT. Caonfiguring and verifing the configuration of NAT and PAT.
What is a network topology? A topology is the layout of how a network communicates with different devices. In this video we discuss the star, bus, ring, mesh, ad hoc, infrastructure and wireless mesh topologies.
Explains the basics of transport protocols and compares the two major options: UDP and TCP.
Here's a list of the sections in this video and their time codes:
00:07 - About transport protocols
02:11 - User Datagram Protocol
04:08 - Transmission Control Protocol
09:00 - So which one is better?
== Further reading ==
How can BitTorrent run reliable file transfers over UDP?
== Acknowledgements ==
The thumbnail of this video uses an icon by Dmitry Baranovskiy from The Noun Project. The icons that are used throughout the video are credited to their respective authors at the end of the video.