What is the primary function of routers?
- To separate collision domains only
- To separate DNS domains
- To separate broadcast domains only
- To separate collision domains and broadcast domains
Routers create both a broadcast domain for each interface. Routers move traffic from one network to another network, with each interface hosting an IP subnet. A router is a hardware device that transmits data among computers in different networks. Routers use IP addresses to make routing decisions.
A switch is a device that separates collision domains only. Switches make switching decisions based on MAC addresses. A switch is a high-speed networking device that receives incoming data packets from one of its ports and directs them to a destination port for local area network access. A switch will redirect traffic bound outside the local area to a router for forwarding through an appropriate WAN interface.
Neither routers nor switches create only a broadcast domain on each interface. Routers create both a broadcast domain and collision domain for each interface. A switch is a device that separates collision domain only.
DNS servers, not routers, separate DNS domains. A Domain Name Service (DNS) server provides a centralized database of domain name-to-IP address resolutions on a server that other computers on a network can use for name resolution.
Objective: Network Concepts
Sub-Objective: Describe the basic operation of these network device types: Router, Switch, Hub, Bridge, Wireless access point (WAP), Wireless LAN controller (WLC)