The function of a router is to:

Question

BlackTom AI · Accepted Answer

A router forwards packets between different networks, so its primary role is to connect a local network (LAN) to other networks such as the internet (a WAN).

Relevant knowledge points and concepts:
- Router: a network device that examines packet headers and forwards IP packets between distinct networks using a routing table; typically performs NAT, DHCP, and firewalling in small/home routers.
- LAN (Local Area Network): a network for devices in a limited area (home, office).
- WAN (Wide Area Network): a broader network linking LANs over long distances (the internet is the largest WAN).
- Switch/hub vs router: switches forward frames within the same LAN (based on MAC addresses); routers forward packets between different networks (based on IP addresses).

Step-by-step reasoning:
1. Identify the device purpose: routers operate at Layer 3 (network layer) and direct traffic between IP networks.
2. Match to the options: "Connect a LAN to a WAN" describes linking a local network to an external network (internet), which is exactly what routing does.
3. Consider typical home setup: the router connects your home LAN to your ISP’s WAN, doing NAT so multiple LAN devices share one public IP.
4. Confirm that other choices describe different functions or devices.

Why the correct answer is correct:
- "Connect a LAN to a WAN" matches the router’s core functionality—routing traffic between two networks and enabling LAN devices to reach WAN resources.

Why other options are incorrect:
- "Connects blue tooth devices to the computer": Bluetooth pairing is handled by a Bluetooth adapter, not a router.
- "Print documents within a LAN": Printing is performed by the printer/printer server; a router may transport packets but does not print.
- "Connects wireless keyboard to the CPU": Wireless keyboards use USB receivers or Bluetooth, not routers.
- "Connect devices within a LAN": That is the primary role of a switch or hub; routers connect different networks rather than just devices inside one LAN.

Final confirmation: The correct answer is "Connect a LAN to a WAN," which matches the provided answer.

The function of a router is to:单项选择题

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