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
- ["Decibels"]
Layer 2: Data Link Layer
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.