OSI Network

Question 1

Explain the Application layer

Answer 1

The Application layer is the end user layer and offers services to applications such as web browsing, email,l and filer transfer. Protocols include HTTP and DNS.

Question 2

Explain the Presentation layer

Answer 2

The Presentation later translates data between the application layer and network layers, including encryption, decryption, compression and translation. Protocols included SSL and ASCII.

Question 3

Explain the Session later

Answer 3

The Session layer manages sessions between application, establishing, maintaining and terminating connections. Protocols include API

Question 4

Explain the Transport layer

Answer 4

The Transport layer ensures the complete transfer of data with error checking and data flow control. Protocols include TCP

Question 5

Explain the Network layer

Answer 5

The Network later determines the best path to move data from its source to destination and handles packet forwarding. Protocols included IP and ICMP

Question 6

Explain the Data Link layer

Answer 6

The Data Link layer handles error detection and correction from the physical layer and provides node-to-node transfer. Protocols include MAC and Ethernet

Question 7

Explain the Physical layer

Answer 7

The Physical layer transmits raw bit streams over a physical medium e.g. cables, hubs and repeaters

Question 8

What is a Switch?

Answer 8

Switches operate on the Data Link layer. They allow multiple computers to connect to a network through a single node, reducing wiring. They efficiently and intelligently forward data frames within LANs based on MAC.