You seem to have replied to me in a private message. I will post it here for the benefit of other readers as well. You responded:
Thanks for info but I want to know it’s practical implementation of crossover cable connected between the router and confirm me is the ethernet port in router can be used for wan link to service provider .You said that same device at end have use cross over cable but this cabling is used for ethernet connection.This statment is contradict .Please share in more deep as I m beginner in networking and confused to associate cable in gns 3 or packet tracer.
Why the statement is contradict that we use cross cable if device at both end is router as I know router is used for wan purpose or to communicate to other network for providing internet connection by choosing best path from routing table
We only use serial cable at serial port for wan connection and ethernet port of router is used to connect lan part .by connected straight cable.
Please tell me in ds what a router behave if we use cross cable .
Thanks & Regards
I understand your confusion. First of all, let’s take a look at the definition of a WAN. A WAN is a type of network that connects the local network in a building or campus to either the Internet, a private network connecting remote sites, or to a network maintained by an ISP. The technology used by that WAN can be anything. It can be Ethernet (Metro Ethernet), serial, fiber optic, microwave link, xDSL, Cable modem, ISDN, MPLS, or others. A WAN link can use many different types of technologies, but what makes it a WAN is the geographic scope. In general, a WAN will connect a local network to the outside world, or to remote sites.
Secondly, a router is not limited to functioning only as a device connected to a WAN. Routers can exist within the enterprise network of a building or campus, and route traffic between internal subnets.
So you can have routers that do not connect to the WAN as well as routers that connect to the WAN. In both cases, many different types of technologies can be used for connectivity. WANs are not limited to serial connections and LANs are not limited to UTP based Ethernet cables. So you may have a crossover cable connect two routers inside your local network, or you might have a router connected to the WAN using an a crossover cable as well. Or you may have fiber optics within your network interconnecting many routers or a fiber connection providing you connectivity to the Internet or to remote sites.
In the past, WAN meant serial, and LAN meant Ethernet. This is no longer the case as many of these technologies, especially Ethernet, have been developed for use on the WAN as well.
I hope this has been helpful!