NetworkingLesson 6Free preview
CS Network Layer
This lesson is part of Cyber Security · All levels
Summary
The network layer (layer 3 on the OSI model) handles logical saving and packet routing between networks. This is where IP addresses and subnet masks work to separate the network and host segments, and ICMP protocols are used by ping commands to test connectivity. This understanding is important to detect infiltration and limit the movement of the attacker.
Key points
- Network layer = layer 3 OSI, responsible for addressing and routing.
- The subnet mask separates the network ID from the host ID on IPv4.
- ICMP is used ping and traceroute for network diagnostics.
- 127.0.0.1 is the loopback address that points to the computer itself.
- IP mapping and network segmentation minimize the impact when a single segment is compromised.
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