Network Engineer Interview Questions and Answers | Network Engineer Interview |
The OSI model is divided into two layers: upper layers and lower layers.
Application Layer (Layer 7):
The topmost layer is responsible for providing network services directly to end-users or applications.
Ex: HTTP, SMTP, FTP
Presentation Layer (Layer 6):
Handles data translation, encryption, and compression to ensure that data is exchanged.
Session Layer (Layer 5):
Manages and controls the dialog between two devices or systems.
It establishes, maintains, and terminates communication sessions, allowing for synchronization and error handling.
Transport Layer (Layer 4):
Responsible for end-to-end communication and data segmentation.
It ensures that data is reliably delivered from one system to another
Ex TCP and UDP
Network Layer (Layer 3):
Handles routing and forwarding of data packets between different networks.
Ex: IPv4 and IPv6
Data Link Layer (Layer 2):
Deals with framing, addressing, and error detection at the local network level.
Ex: STP, MAC, Switch, HSRP
Physical Layer (Layer 1):
Defines the physical medium and the hardware components needed to transmit raw binary data across it.
Ex: Cable, NIC card
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