Tag - Seven Layers

Basic Networking Notes

I would like to discuss some basic networking notes especially helpful for beginners who are thinking of establish a good career in this field. These networking notes supply the fundamental details about network types, communication technology, network troubleshooting, network topologies, network products and also the fundamental summary of the WAN and LAN models of communication.

  • What is computer network?
  • What’s DHCP?
  • What’s DNS and just how it really works?
  • What is computer Firewall?
  • Types of networks
  • Voice over internet protocol (VOIP) Communication Technology
  • Wi Max Technology
  • Network Gateway
  • Router
  • Fiber Optic Cable
  • What’s File Server?
  • OSI Model of seven layers
  • GSM Technology

OSI Model Review

Lists the seven layers of the OSI model and significant aspects of each layer

OSI Model
Application Layer

  • Provides an interface between a hostÔÇÖs communication software and any necessary┬áexternal applications.
  • Evaluates what resources are necessary and available resources for communication┬ábetween two devices.
  • Synchronizes client/server applications.
  • Provides error control and data integrity between applications.
  • Provides system-independent processes to a host.

Presentation Layer

  • Presents data to the application layer.
  • Acts as a data format translator.
  • Handles the structuring of data and negotiating data transfer syntax to Layer 7.
  • Processes involved include data encryption, decryption, compression, and
  • decompression.’

Session Layer

  • Handles dialog control among devices.
  • Determines the beginning, middle, and end of a session or conversation that
  • occurs between applications (intermediary).

Transport Layer

  • Manages end-to-end connections and data delivery between two hosts.
  • Segments and reassembles data.
  • Provides transparent data transfer by hiding details of the transmission from┬áthe upper layers.

Network Layer

  • Determines best path for packet delivery across the network.
  • Determines logical addressing, which can identify the destination of a packet or┬ádatagram.
  • Uses data packets (IP, IPX) and route update packets (RIP, EIGRP, and so on).
  • Uses routed protocols IP, IPX, and AppleTalk DDP.
  • Devices include routers and Layer 3 switches.

Data Link Layer

  • Ensures reliable data transfer from the Network layer to the Physical layer.
  • Oversees physical or hardware addressing.
  • Formats packets into a frame.
  • Provides error notification.
  • Devices include bridges and Layer 2 switches.

Physical Layer

  • Moves bits between nodes.
  • Assists with the activation, maintenance, and deactivation of physical connectivity
  • between devices.
  • Devices include hubs and repeaters.

OSI Layers
OSI Model

 

OSI Model

Download OSI Download Model Chart

CCNA Exam ÔÇô OSI & TCP/IP Model

Cisco CCNA Notes

 

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