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

类似问题

A student in Sydney sends a request to a server in the USA. The data passes through multiple routers across different networks to reach the destination. Which layer is responsible for selecting the path for this data?

Question-8) In which protocol layer are carried the ICMP (Internet Control Message Protocol) messages?

What is the protocol data unit used to describe a piece of data at the Network layer is OSI model?

IPv4 and IPv6 is example of protocol for which layer in OSI model?

Which of the following is true about routers?

In the Internet protocol stack, the Network Layer is responsible for finding the destination IP address.

Question at position 23 Which layer of the OSI model is responsible for logical addressing (IP addresses) and routing?Data Link LayerNetwork LayerTransport LayerPhysical LayerClear my selection

Which layer of OSI model would you find ICMP, IP and IPX protocols?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单