What are the seven layers of the OSI model in order from Layer 1 to Layer 7?

Physical, Data Link, Network, Transport, Session, Presentation, Application.

At which OSI layer does a router primarily operate?

Layer 3 (Network layer), where it makes forwarding decisions based on IP addresses.

At which OSI layer does a standard Layer 2 switch primarily operate?

Layer 2 (Data Link layer), where it forwards frames based on MAC addresses.

What is the PDU (Protocol Data Unit) name at the OSI Transport layer?

Segment. TCP uses segments to encapsulate data at Layer 4.

Which OSI layer is responsible for end-to-end error detection and correction, flow control, and reliable data transfer?

Layer 4, the Transport layer, handles end-to-end reliability, flow control, and error recovery.

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CCNA Network Fundamentals

Master the core concepts of Network Fundamentals for the CCNA Cisco Networking Certification. These 28 flashcards cover the OSI model, TCP/IP stack, network topologies, IP addressing, and essential protocols tested on the exam.

28 cards Intermediate OSI Model TCP/IP Model & Protocols IP Addressing & Subnetting Network Topologies & Components

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