03-28-2006 04:51 AM - edited 03-03-2019 02:31 AM
i don't know if i know this question, but i got it in the exam recently and i chose - straight-through cable. please is this right? if not then what is the right cable to use?
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03-31-2006 06:48 AM
Hi Friend,
Yes this statement is wrong!!
As I mentioned in my first post divide the networ device in 2 groups.
Switch and Router belong to different group so need a straight through cable and if any device need to be connected in same group needs a cross over cable.
HTH, if yes please rate the post.
Ankur
03-28-2006 04:54 AM
That is correct - a straight-through cable is what you need.
Hope that helps - pls rate the post if it does.
Paresh
03-28-2006 06:10 AM
Hi Friend,
As Paresh already confirmed you the right answer but I will tell you the trick to remember this.
Divide the major network devices in 2 groups
Group A (Router,PC,Server)
Group B (Switch,Bridge,Hub)
Whenever you have to connect devices in 2 different groups use straight through cable and when you have to connect any devices in same group use corss cable.
HTH, if yes please rate the post.
Ankur
03-29-2006 01:31 AM
please let me know which router ur using. As far as i know majority of routers work with cross cable.
03-29-2006 01:43 AM
Hi Friend,
No router needs a corss cable to connect to switch. They always need a straight cable.
Yes if router has a switch module and you connect via switch module to switch then you need a cross cable.
But talking about a ganeral router with its layer 3 interface when connected to switch need a straight cable for sure.
Regards,
Ankur
03-29-2006 06:33 AM
that is the big problem: in the exam, the question just stated 'what cable would you use to connect the fa0/0 port of a router to the fa0/0 port of a switch?' they did not state on which particular router. so what would your answer be to such an ambiguous question? straight-through or crossover?
03-29-2006 06:36 AM
the numbering "fa0/0" on a router logically precludes a switch module on a router, as it would be something like "fax/y/z" so you can assume a router port connecting to a switch port, which will always be a straight through.
HTH,
Bobby
03-31-2006 06:36 AM
so in effect, the statement below is wrong?:
"The fastEthernet ports on a router and a switch are both RJ-45 ports. It means we have similar devices on both ends. So a crossover cable must be used here."
apparently the above statement is wrong!
03-31-2006 06:48 AM
Hi Friend,
Yes this statement is wrong!!
As I mentioned in my first post divide the networ device in 2 groups.
Switch and Router belong to different group so need a straight through cable and if any device need to be connected in same group needs a cross over cable.
HTH, if yes please rate the post.
Ankur
05-05-2021 02:24 PM
It was wrong.
05-09-2021 01:44 PM
Hello
Nowadays ports on routers/switches usually support auto-mdix which can negate the need for crossover cabling between devices unless that is you are working with quite old hardware.
05-10-2021 08:50 AM
Yes, as noted by Ankur, and others, that statement is wrong.
Although both devices use RJ-45, wiring of pins differ between MDI and MDI-X. For MDI <> MDI-X you'll need a strait through cable. For MDI <> MDI or MDI-X to MDI-X, you need a cross over cable.
However, as mentioned by Paul, some devices can dynamically self configure their port as MDI or MDI-X. For those devices, you can use either cable type. Also, however, for devices that support auto MDI/MDI-X, the port might need to be configured a certain way, on Cisco devices, usually port must be "auto" mode. If you hard configure speed/duplex, the port will normally be configured just as MDI or MDI-X, whatever is "normal" for the device.
Lastly, standard MDI or MDI-X for the device is generally set so that for unlike devices, that usually connect, one is MDI and one MDI-X, using, again, a strait through cable, e.g. switch <> host or switch <> router. "Like" devices, e.g. switch to switch (copper) will have same type of connection, which, without auto MDI, will need cross over cable.
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