First of all, may I welcome you to my site. My name is Chris and I'm from the UK and work as a Systems Engineer for Cisco. This blog was initially created to post up my subnetting technique but has now got more stuff to do with attaining Cisco certifications. Either way I really hope that the content is sufficent for your needs and I look forward to hearing your feedback. If you find that the content really helps you please feel free to donate using the PayPal link on the right.

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CCNA - Connecting devices

Don't worry about remembering which type of cable should be used when connecting alike or different devices. Use the simple diagram to the left and you won't go wrong!

Posted byChris Bloomfield at 14:50  


jeddah said... 6 August 2009 at 20:03  

thanks , it Great

javedsher said... 4 October 2009 at 12:29  

There is concept of similar devices with crossover cable but there switch and hub are not similar devices, Can you explain this?


Chris Bloomfield said... 5 October 2009 at 10:13  

Like devices have the same pin-out for obvious reasons but it just so happens hubs and switches have the same pin-out as do hosts and routers.

Steve Brannon said... 12 June 2012 at 00:31  

A good way to remember this is by knowing which OSI layer these devices work in. If the connection to the two devices crosses an OSI layer, use a straight. If the devices are in the same layer, use a cross-over.

L2 devices: hubs, L2 switches
L3 devices: hosts, routers, servers

Steve Brannon said... 12 June 2012 at 00:33  

Here's an easy way to remember as well. If the devices operate in the same OSI layer, use a cross-over. If they operate in different layers, use a straight.

Layer 2 devices are hubs and switches. Layer 3 devices are routers, servers and hosts.

tektiddy said... 24 March 2014 at 00:26  

@ Brannon,
A hub is a layer 1 device, a switch a layer 2 devices, in-fact that is the distinct difference between the two. A hub broadcast out all ports, no separation of collision domains, and no learning of layer 2 addresses. A switch however, accounts for all the above at layer 2.

Kathiresan Muthu said... 25 February 2015 at 10:54  

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