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1What are two sub layers at the data link layer? Explain the functions provided at each sub-layerLogical Link Control:
Upper sublayer
Interacts with the network layer above. Establishes logical links, managing traffic. Flow and error control.
MAC is the lower sublayer.
Interacts with the physical layer. Defines the specific access method for each LAN.
2Draw a diagram of the OSI (Open systems interconnection) model in the box provided below, and describe the functions performed at each layer.Application - Provides services to user-FTP/HTTP
Presentation - Translation, Compression, Encryption
Session - Dialog control and synchronization
Transport - Message delivery from one process to another.
Network - Individual packets from source to destination host.
Data link - Moving frames from one node to the next.
Physical - Transmits physical bits over the network.
3How does the Internet (TCP/IP) model differ from the OSI model?OSI model only a guideline for protocol design. The internet model uses 4 layers and combines some of the layers from the OSI model into one layer.