Google Engineer. Dual CCIE #38070. JNCIE-SP #2227
Traceroute is a powerful tool. Extremely useful when checking the path of a packet through the network. But how does it ACTUALLY work? What is REALLY going on? Layer3 packets all have a TTL. A Time To Live. If a router receives a packet with a TTL of 1 (and the packet is addresses to…
What is ARP and how does it actually work? I’m surprised at the amount of people who don’t know exactly what it does and how important it is. To illustrate, I’m going to use this extremely simple network: Both of these systems are really just connected to a home router. Remember that these ports are…
Sign it here: http://etherealmind.com/petition/ DO IT!!! We the undersigned ask you to sign our petition. We are the people who are learning about Data networking and Cisco IOS software. As students and practitioners, we need to learn theory and knowledge and then to take that knowledge and practice on Cisco IOS software. We want to…
STP works extremely well, but you lose operational links with it. i.e. you lose bandwidth. There are also quite a few other problems with STP (convergence speed being 1 of them) TRILL seems to be the new technology coming in to resolve this. I’ve gone through the RFC: http://tools.ietf.org/html/rfc5556 and it looks pretty awesome stuff. I particularly like the…
As promised, I’ll now start writing up solutions to my previously posted labs. I hope this will spur up some conversation. I still stress that you should always try to do the lab without my help first. This will ensure you learn how to do it properly. Also remember that there are always multiple ways…
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