4.1-1. The network layer - where is it? Check all of the statements below about where (in the network) the network layer is implemented that are true.

Question

4.1-1. The network layer - where is it?   Check all of the statements below about where (in the network) the network layer is implemented that are true.

BlackTom AI · Accepted Answer

The network layer operates both inside end systems (hosts) and inside routers in the network core, because IP functionality is needed at endpoints to form and consume packets and at routers to forward those packets between networks.

Relevant knowledge points and concepts:
- Layering: In the Internet (TCP/IP) model the network layer (commonly called the Internet layer) provides logical addressing and packet forwarding (IP).
- Hosts: End systems run the IP stack to create, transmit, receive, and process IP packets; they perform functions like IP addressing, fragmentation, and TTL management.
- Routers: Network devices whose primary job is to examine IP headers and forward packets toward their destination using routing tables—this is the core network-layer function.
- Switches (Ethernet): Operate at the link layer (Layer 2), forwarding frames based on MAC addresses, not IP; they do not perform IP routing unless they are “layer-3 switches” with routing capability.
- Physical medium independence: The network layer is independent of wired vs wireless; IP runs over both.

Step-by-step reasoning for each option:
1) "The network layer is implemented in Ethernet switches in a local area network." — Incorrect. Standard Ethernet switches forward frames by MAC addresses at the link layer. They do not perform IP routing. Only specialized devices or layer-3 switches implement network-layer functions.
2) "The network layer is implemented in routers in the network core." — Correct. Routers examine IP headers, consult routing tables, and forward packets across network boundaries; this is the canonical network-layer implementation in the core.
3) "The network layer is implemented in hosts at the network's edge." — Correct. Hosts must implement IP to generate and receive packets and to participate in end-to-end communication.
4) "The network layer is implemented in wired Internet-connected devices but not wireless Internet-connected devices." — Incorrect. IP is agnostic to the physical medium; both wired and wireless devices implement the network layer.

Why the correct answers are correct: routers perform forwarding/routing (network-layer) and hosts implement the IP stack to form and process packets. This confirms the correct choices: "The network layer is implemented in routers in the network core." and "The network layer is implemented in hosts at the network's edge."

4.1-1. The network layer - where is it? Check all of the statements below about where (in the network) the network layer is implemented that are true.多项选择题

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