Because they are considered to be "Like" devices
we use straight cable to connect between the router and switch as router and switch are different devices.
when you are connecting same devices like computer to computer or switch to switch or router to router to use cross over cable. when you are connecting different devices like computer to switch or computer to router to use straight cable.
"RJ-45 Cross cable" is required for a direct ethernet connetion between two pcsbetween the same type of network devices (PC-to-PC, switch-to-switch, router-to-PC (Note: router and PC are LIKE devices, because both are DTE)) you use Crossover cable.to connect different type of devices (PC-to-switch, PC-to-router ..) you use Straight Through cable.
Cat5 cable
There are several different cables that you can use for this process. They include a cross over cable or an uplink.
You need a crossover cable to connect two routers via normal Ethernet interfaces.
External modems are built with a female data communications equipment (DCE) DB-25 port for connection to a controlling device such as a PC or a router. Depending on the model of the router you are connecting to, you will use that type of cable. For details lookup "modem-router configuration" on cisco.com
There is no difference between a laptop or a desktop when setting up a router. You should use an Ethernet cable when setting up your router, and use the wireless only after it's setup.
If you want to use wireless internet to connect a second PC to a router, you can use a cable cord, or coaxial cable. This can be hooked directly to the router.
The easiest way is directly connected to a modem/router or router. You'll need a cross-over cable (included with your PS3), or can use the wireless function if your router supports it.
You don't use the cable cord. You use an ethernet cable of either Cat 5e or Cat 6 between the PS3 and the Comcast cable modem. If something is already connected to the cable modem like a desktop PC you must either disconnect it (switching back and forth as you want to use each device) or purchase a router and connect both the desktop PC and the PS3 to the router and the router to the modem.
Yes, you can connect directly via the use of a cross-over cable, or through a connectivity device such as a hub, switch, or router.