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Network Layer in OSI Model Cheat Sheet (DRAFT) by

Network Layer in OSI Model.

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Layers of the OSI Model

Physical Layer (Layer 1)
Data Link Layer (Layer 2)
Network Layer (Layer 3)
Transport Layer (Layer 4)
Session Layer (Layer 5)
Presen­tation Layer (Layer 6)
Applic­ation Layer (Layer 7)

Network Layer Functi­onality

Intern­etw­orking
Establ­ishes logical connec­tions between nodes in the same or different networks
Fragme­ntation
Breaks down packets into the smallest individual data units that transit across various networks
Packet­izing
Encaps­ulates the packets received from upper layer protocol and makes new packets
Routing
Moves data from one device to another device
Traffic management
Manages traffic problems such as switching, routing, and controls the congestion of data packets
 

Anatomy of a Data Packet

In Network Layer, the Protocol Data Unit (PDU) is a Packet.

Network Layer Protocols

IP
Internet Protocol
ICMP
Internet Control Message Protocol
ARP
Address Resolution Protocol
DDP
Datagram Delivery Protocol
IGMP
Internet Group Management Protocol