Install a switch.
Collisions
Too many computers connected, and trying to transmit at the same time; and the use of switches instead of hubs.
To prevent collisions.
The role of the ethernet port on a PC is to allow internet to be connected. Without an ethernet port, there is no place for the computer to be connected to the internet.
If your printer is attached directly to your computer, you should share it (the way you do it depends of your operating system). If your printer is connected directly to your network (WiFi or Ethernet) it should be properly configured.
when ethernet cable is plugged in it is detected by ethernet card. if the cable is connected to network it detects that network and dispalys " you are connected to network"
Wired Ethernet can physically detect collisions, WIFI can't.
by comparinig the xmit line to the recieve line and look for differences
The FastEthernet interface of R1 is disabled. One of the default routes is configured incorrectly. A routing protocol is not configured on both routers. The default gateway has not been configured on both routers.
The bus cable to which computers on the Ethernet is connected is called the trunk. If the trunk breaks, a bus topology is completely disrupted.
A wireless router will usually be connected directly to a high speed modem between the modem and any other device. This allows the router to correctly pass internet requests from the local network (computers connected wirelessly or to a standard port) to the ISP (the high speed modem connected to the Internet port). Connecting a wireless router to a computer would be unusual but it could function if connected to the network port on the computer provided the router-computer connection was properly configured. In this case the computer would have to be configured to route.
There are two cases. First one is because your router is configured to use one of open ports for internet connection. Second is your router has to be replaced if the fact bothers you.