The TCP/IP Application layer encompasses the functionality of the OSI Session, Presentation, and Application layers.

The Data Link layer encapsulates packets into units called frames for transmission over physical media.

The Session layer (Layer 5) is responsible for establishing, managing, and terminating communication sessions between applications.

Internet Protocol (IP) operates at the Internet layer, handling the logical addressing and routing of packets.

The Presentation layer (Layer 6) handles formatting, encryption, and compression, ensuring data can be understood by the application.

The Network Access layer of the TCP/IP model maps to the OSI Physical and Data Link layers, handling hardware-level addressing and physical transmission.

The Network layer (Layer 3) handles routing, logical addressing (IP), and path determination.

Transmission Control Protocol (TCP) is a connection-oriented transport protocol that ensures reliable data delivery.

The Physical layer (Layer 1) defines the hardware, cables, signals, and interface standards required for data transmission.

The Network Layer is responsible for logical addressing (IP addresses) and determining the best path (routing) for data packets.

The Data Link Layer is divided into two sub-layers: LLC and MAC. The MAC sub-layer handles physical addressing and media access.

The Internet layer of the TCP/IP model manages communication across distinct networks using IP, similar to the OSI Network Layer.

Encapsulation is the process where each layer adds its own header (and sometimes trailer) to the PDU of the layer above it.

Layer 2 switches use MAC addresses to forward frames to specific ports, unlike hubs which broadcast data to all ports.

Data at the Transport Layer (TCP) is referred to as a Segment; if UDP is used, it is referred to as a Datagram.

The Presentation Layer acts as a translator for the network, handling data formatting, encryption, and compression.

The Internet Layer (IP protocol) is connectionless, meaning it treats each packet as independent and does not require an established session prior to sending.

The Application Layer is the top layer of the OSI model, serving as the window for application programs to access network services.

Layer 3 switches perform high-speed packet forwarding using hardware ASICs, whereas traditional routers offer more complex routing protocols and wide area network (WAN) connectivity.