What is internet? | OSI model | Network Virtual Terminal

• What is internet?

A global computer network consisting of interconnected networks sharing information and communication facilities using standardized communication protocols.

• List the layers of OSI model

1. Application layer
2. Presentation layer
3. Session layer
4. Transport layer
5. Network layer
6. Data link layer
7. Physical layer

• Define OSI model

A layered framework for the design of network systems that allows communication between all computer systems.

• What OSI layers are the network support layers?

1. Physical layer
2. Data link layer
3. Network layer

• What OSI layers are the user support layers?

1. Session layer
2. Presentation layer
3. Application layer

• What are the responsibilities of physical layer, data link layer, network layer, transport layer?

Physical layer– Transmitting individual bits from one code to the next.

Data link layer- Transmitting frames from one node to the next.

Network layer– Delivery of packets from the origin source to the final destination.

Transport layer– Delivery of a message from one process to another.

Session layer– To establish, manage and terminate sessions.

• Name some services provided by the application layer

1. Directory services
2. Mail services
3. File transfer, access and management
4. Network virtual terminal

• Explain Network Virtual Terminal

A software terminal that allows a user to log on to a remote host