Cisco CCNA 200-301 Flashcards

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Network Fundamentals

Question

List the 7 OSI layers from Layer 1 to Layer 7 and a key device or protocol at each layer.

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Network Fundamentals

Answer

L1 Physical: bits, hubs, cables L2 Data Link: frames, switches, MAC/LLC (Ethernet) L3 Network: packets, routers (IP, ICMP) L4 Transport: segments/datagrams (TCP, UDP) L5 Session: sessions (NetBIOS, RPC) L6 Presentation: data format/encryption (TLS, JPEG) L7 Application: user-facing (HTTP, FTP, DNS, SMTP) Mnemonic: 'Please Do Not Throw Sausage Pizza Away'

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