CS Professional · Artificial Intelligence, Data Analytics and Cyber Security - Laws and Practice · Network Basics and Security
Mehta Textiles Ltd. uses a firewall that filters traffic purely on source and destination IP addresses. At which OSI layer does this filtering primarily operate?
Filtering on source and destination IP addresses operates at the network layer, Layer 3 of the OSI model, because IP addressing and routing belong to that layer. The data link layer deals with physical MAC addresses within a local network, not IP addresses.
- APhysical layer
- BData link layer
- CNetwork layerCorrect
- DPresentation layer
Explanation
IP addresses are logical addresses handled at the network layer (Layer 3), so packet-filtering on them works there. The data link layer uses MAC addresses, so filtering by MAC would be the distractor's layer, not IP-based filtering.
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