COMPUTER NETWORK | TUTORIAL | LECTURE 4

1.       Briefly describe five main issues that must be addressed when designing computer networks

CONNECTIVITY AND SECURITY - People wanted to be connected even on the go. Computer networks should be able to provide security and a smooth connection with everyone at the same time.

REDUNDANCY – Having multiple servers is a good thing just in case something happens to the     other one while the other isn’t affected.

STANDARDIZATION – If everyone is using the same thing, the network can run smoothly.

DISASTER RECOVERY – Back up is a must in case an incident takes place.

GROWTH – Expansion is a factor that is why there should be an allowance when designing computer networks.

2.      Briefly explain why networks are modeled as a stack of layers

-        They are modeled as stacks to make the design and evaluation easier.

3.      Briefly describe the role of an interface when modeling a network as a stack layers

-        They should all be linked in order to standardized protocols.

4.      Explain the role played by a session in a network connection.

-        It is the basil requirement to complete a connection-oriented communication. It is also the basic phase to transmit in connectionless communication modes

5.      State the seven layers of the OSI Reference Model in the correct order and briefly state the purpose of each level.

LAYER 7: Application – provides end-user services like file transfer and e-mailing.

LAYER 6: Presentation – It converts incoming and outgoing data from one presentation format to another.

LAYER 5: Session – Sets up, coordinates and terminates conversations.

LAYER 4: Transport – Manages packetization of data, then the delivery of the packets, including checking for errors in the data once it arrives.

LAYER 3: Network – Handles the addressing and routing of the data.

LAYER 2: Data Link – Sets up links across the physical network frames

LAYER 1: Physical – Conveys the bit stream through the network.