interesting interview question?

[Jet-Fighter7700]

Hi Guys,

so a friend of mine showed me a interview question he just got asked, thought it was quite interesting so I thought Id share it....

How do you connect two pcs to a router (which has 4 ports) with 4 rj45 jacks and one piece of network cable? You can only use the whole network cable, you may not cut it into two pieces

clearly you will need 2 cables to connect both PC's to a router, and if you cant cut the one cable, how could you do this?

I mean yeah, cheat.... wi-fi one of them.....

but otherwise it does not seem possible to be done?

 

[PsyWulf]

Only need 2 pairs per PC for Base100/Base10 so technically you can wire 2 PCs -> 2 RJ45 -> 1 Cable -> 2 RJ45 -> 2 Ports on router

Any lazy cabler has done it in a pinch

 

[Gtx Gaming]

Network cable normally has 4 pairs inside, for a total of 8 small cables inside. You only need 1 pair/2 small cables for the network to work.

 

[Jet-Fighter7700]

Only need 2 pairs per PC for Base100/Base10 so technically you can wire 2 PCs -> 2 RJ45 -> 1 Cable -> 2 RJ45 -> 2 Ports on router

Any lazy cabler has done it in a pinch

but how, if you only have one cable, how could you join 3 devices with one cable essentially?
I mean yes you could connect one to another with crossover cable, but not everything to a router.

its not possible...

 

[Jet-Fighter7700]

Network cable normally has 4 pairs inside, for a total of 8 small cables inside. You only need 1 pair/2 small cables for the network to work.

but you will need to cut the cable into 2 at some point?

 

[PsyWulf]

but how, if you only have one cable, how could you join 3 devices with one cable essentially?
I mean yes you could connect one to another with crossover cable, but not everything to a router.

its not possible...

I answered this and showed how?

 

[Ancalagon]

but you will need to cut the cable into 2 at some point?

You are just splitting the ends of the cable, not the whole cable. One length of cable that splits into 2 at both ends.

Stupid interview question though.

 

[xrapidx]

Crossover cable EDIT: Nevermind, missed to the router part

 

[PsyWulf]

but you will need to cut the cable into 2 at some point?

No,you'll have to strip quite a bit of the covering off,but technically a network cable is just a bunch of thin wires wrapped up together,of which you can get away using half per pc

 

[Jet-Fighter7700]

I answered this and showed how?

forgive me but Im not really following,

can you make 3 devices connect with one cable, I mean yes split the pairs, but surely that wont work?

 

[dadecoza]

^ what they said, if it is not a POE device the blue and brown pairs can be used (568B).

 

[PsyWulf]

forgive me but Im not really following,

can you make 3 devices connect with one cable, I mean yes split the pairs, but surely that wont work?

Pretty picture

 

[Kloofvreter]

A bit of a trick question then.

Emphasis is thus on not cutting the cable into two pieces?

I'd have assumed that the cable should not be cut at all.

Also, that does NOT look like best practice to me

 

[PsyWulf]

Same reason why a bad crimp will sometimes mean your network speed drops to 10/100mbps if all the pairs arent properly seated

 

[Thor]

Interviewer (Director): If I abuse one of my employees what will you do.

 

[PsyWulf]

A bit of a trick question then.

Emphasis is thus on not cutting the cable into two pieces?

I'd have assumed that the cable should not be cut at all.

Also, that does NOT look like best practice to me

Combines knowledge on CAT5/Networking and some ingenuity

 

[dadecoza]

Crossover cable EDIT: Nevermind, missed to the router part

also ... I'm pretty sure you can connect two pc's directly without a crossover ... these newfangled computers can figure these things out.

 

[PsyWulf]

also ... I'm pretty sure you can connect two pc's directly without a crossover ... these newfangled computers can figure these things out.

Telepathy is a thing isn't it

 

[The_Ogre]

Telepathy is a thing isn't it

I'm sure he meant with

 

[Jet-Fighter7700]

Pretty picture

thanks for this, so essentially if I understand it right you will have ONE cable connecting 2 computers to 2 ports,

I get it now, interesting take on crimping and cabling I must say....

my friend just said Wlan , but technically that's cheating.....
me I would have even gone with Power over LAN, as technically what if the 2 PC's aren't next to each other.....