The next item on the agenda for studying towards the ICND2 is the Power On Self Test or POST.
POST is the first thing to run when you first turn on a Cisco Router, stored and run from ROM, the POST tests the serviceability of the routers components. One example that is often described is that POST checks to see if the interfaces are fully functional.
Once everything checks out, the router will then continue with loading the bootstrap.
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ICND2 Topics, Networking, Routers | Tagged: boot, bootstrap, ccna, Cisco router, fa0/1, icnd1, icnd2, interface, post, power on self test, read only memory, rom, router | 
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Posted by Josh Gahan
The router goes through a series of events every-time the router is powered on, from performing tests and loading IOS. For the ICND2 exam it is required that you can describe the boot process. Here are the events:
If a startup-config is not found the router will send out a broadcast looking for a TFTP host containing a configuration file, when this fails the router will then load into setup mode.
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Posted by Josh Gahan
The Root switch is elected in the following order:
Once the root switch is elected either by lowest BID or MAC address, this switch will be responsible for sending the periodic Hello Bridge Protocol Data Unit‘s (BPDU). These Hello BPDU’s are status messages which all switches on the LAN will receive from the root switch to indicate that the connected links are still working. This sort of works like a heartbeat for the link.
The Hello BPDU contains the following pieces of information:
The hello timer defaults to 2 seconds with a MaxAge time of 10secs.
The Hello timer is the amount of time which the Root waits to send a Hello, while the MaxAge timer is used to tell the listening device how long it should wait before it converges to a new STP topology, after not receiving Hello’s for the indicated amount of time.
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Posted by Josh Gahan
I’m pretty much on track to completing the 200-101 ICND2 course by the end of this month. I have notes upto chapter 10, from memory i think that was OSPF.
Anyway once i’m done i will start reviewing everything with you guys online.
Check out the cisco incd2 course subjects because that’s exactly what i’ll be covering.
Leave a Comment » | Networking | Tagged: 200-101. ccna exam, ccna, cisco, icnd2, icnd2 exam, ospf, router, switch, vlan, VTP | Permalink
Posted by Josh Gahan
Hi all, just a quick update to let you know what’s happening.
Well i’ve almost almost completed reading the ICND2 book , the new 200-101 exam and it is quite different to it’s predecessor so i highly recommend you purchase the new one if you haven’t already. The next thing i have to do is also finish up my notes and get those ios commands stuck in my head. I had initially planned to obtain the CCNA by the end of November but due to some hurdles in the last couple of weeks i will be happy with finishing up all the notes before then.
Also the networkdictionary.wikispaces.com wiki which i have created is coming along nicely. Plenty of Cisco related acronyms in there now, so don’t forget it’s free for anyone and to join also, add whatever is missing (that’s alot)
So keep at it and when the times right i will be covering the rest of the ICND2 exam soon. I’m thinking Identifying WAN technologies next, it’s my favourite.
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Posted by Josh Gahan