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Moves a packet from one node (host or router) to the next node in the route. Relied on by the network layer. Services provided depend on the protocol e.g. reliable delivery. Protocols include Ethernet, WiFi and PPP

Packets on this layer are called '''Frames'''
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Responsible for moving network-layer packets known as '''datagrams''' from one host to another. Protocol includes the celebrated IP protocol. The internet layer also includes routing protocols. The service it provides is ''routing'' datagrams from one host to another.
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Provides guaranteed delivery, flow control (between hosts) and congestion-control mechanisms. Protocols '''UDP''' and '''TCP'''.
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Protocols include: HTTP, SMTP, FTP, DNS etc.

For each layer

  • What is it's functionality
  • Does it employ error correction?
  • What services does it provide?
  • Give several examples if possible.

Layer 1: Physical Layer

The physical layer primarily describes the process of sending 1's and 0's across the line. It includes such concepts as

Moves a packet from one node (host or router) to the next node in the route. Relied on by the network layer. Services provided depend on the protocol e.g. reliable delivery. Protocols include Ethernet, WiFi and PPP

Packets on this layer are called Frames

Layer 3: Network Layer

Responsible for moving network-layer packets known as datagrams from one host to another. Protocol includes the celebrated IP protocol. The internet layer also includes routing protocols. The service it provides is routing datagrams from one host to another.

Layer 4: Transport Layer

Provides guaranteed delivery, flow control (between hosts) and congestion-control mechanisms. Protocols UDP and TCP.

Layer 5: Session Layer

Layer 6: Presentation Layer

Layer 7: Application Layer

Protocols include: HTTP, SMTP, FTP, DNS etc.

OsiModel (last edited 2007-09-07 13:51:46 by scot_notebook)