CyberCertPrepNetwork FundamentalsOSI & TCP/IP ModelsEASYFree question
Which OSI layer is responsible for logical network addressing and provides the ability to route packets across different networks?
- A.Layer 2 - Data Link
- B.Layer 5 - Session
- C.Layer 4 - Transport
- D.Layer 3 - Network
Why D is correct
Layer 3 (Network) provides logical addressing (IP addresses) and routing - the ability to forward packets between different networks. Routers operate at Layer 3. Key Layer 3 protocols: IPv4, IPv6, ICMP, OSPF, BGP, RIP. The distinction from Layer 2: Layer 2 handles delivery on the same network segment; Layer 3 handles delivery across different networks via routing.
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