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Home > Archive > CCNA > December 2003 > help on this question.
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help on this question.
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| kill97 2003-12-05, 11:07 am |
| Your Contoso trainee Arnold has trouble telneting from his PC to a Cisco router using TCP/IP. He asks you what series of actions he should use.
A. Connect the PC's COM port to the router's console port using a straight-through cable.
B. Connect the PC's COM port to the router's console port using a crossover cable.
C. Connect the PC's COM port to the router's Ethernet port using a straight-through cable.
D. Connect the PC's Ethernet port to the router's Ethernet port using a crossover cable.
E. Connect the PC's Ethernet port to the router's Ethernet post using a rollover cable.
F. Connect the PC's Ethernet port to the router's Ethernet port using a straight-through cable.
Ans: f? | |
| Demijohn 2003-12-05, 11:14 am |
| If you want to telnet, you wouldn't be using the com or console ports.
Now, as to straight thru (ST) or crossover (XO) ethernet cables, the rule is use ST when connecting a PC, workstation, server or router to a switch, repeater or hub, and use XO when connecting between switches, repeaters and hubs. But in this case you don't want to do either.
What would you use if you wanted to connect 2 PCs without using a hub (or switch or repeater)? XO! Same thing here. | |
| kill97 2003-12-05, 12:07 pm |
| so i should use a straight-through cable? | |
| Demijohn 2003-12-05, 1:53 pm |
| No, you need a crossover.
Ttypically Hubs,repeaters ans switches have an internal crossover, and the ports are usually marked with an X.
Routers workstations, PCs and servers do not have and internal crossover.
In order to get the connection to work you need an odd number of crossovers. If the router port doesn't have one, and the PC port doesn't have one, the cable has to provide one. (i.e. 0+0+1=1, odd).
When connecting 2 switches, both have internal crossovers, so the cable needs to provide a third, (1+1+1=3, odd) | |
| Detour 2003-12-05, 2:20 pm |
| For the COM port it would be rollover(with the proper db9-rj45 adapter) but since that isn't listed, then you need a cross to connect directly to the router's eth int.
When in a pinch, if you lack a crossover you could use a small cheap hub to connect with straights. | |
| dmaftei 2003-12-05, 9:08 pm |
| quote:
Originally posted by Detour
For the COM port it would be rollover...
Yeah, but you couldn't telnet over the COM port, could you? | |
| y_ning 2003-12-06, 12:15 pm |
| it's important to keep in mind what Detour said.
which kinda cable should we use when:
1)PC' COM---> router con
2)PC' ether----> Router Ether | |
| darthfeces 2003-12-06, 4:09 pm |
| arnold should slowly back away from the router and go get his ccna.
this is a stupid !!!!! question   | |
| Yankee 2003-12-06, 8:55 pm |
| Darthee was havin a bad day 
Yankee | |
| Detour 2003-12-07, 8:38 pm |
| quote:
Originally posted by dmaftei
Yeah, but you couldn't telnet over the COM port, could you?
The question only said his telnet session failed. It asked what series of actions he should take. So any of the console answers would have been correct if they'd supplied the right cable type in the answer. At least, that's the course of action i'd recommend, assuming it's a production router.
Because if it's a production router and he unplugs the ethernet int just because HE can't telnet into it, he's an idiot. For all he knows, there's an ACL on the router blocking him. Connect to the console and keep your job 
Besides, if we really want to get exact, he could REVERSE telnet on a console port..........
Thank you thank you, i'll be here all week. Tip your waitresses. |
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