I have finished with the CBT Nuggets line of study, now onward to Train Signal to really hammer home them points!

STP Fundamentals 1 - Switch theory & Root bridge election

STP Fundamentals 2 Root Path Costs & Load Balancing

Lets look at the output of show spanning-tree

Next session we will continue and change some timers ;0)

21 - Wireless LAN - Frequencies and 802.11 Standards

Only short notes, as this is covered in the CCNA ...

NOTICE, that the extending your network you have your APs on DIFFERENT channels:

22 - Wireless LAN - Understanding the Hardware

awesome game that cisco wireless explorer! lol

23 - The Switches Domain - Additional Life-Saving Technology

etherchannel example
with loopguard, if x1 goes unidrection, it will detect a missed BPDU and disable the whole etherchannel
whereas with UDLD it will just pull out the bad link.

However loopguard does auto recover, will UDLD it is err-disabled so you need an admin to clear.
there is a err-disabled timeout you can configure  ... its a global thing, but its an option

vlan 10, stays within building B's floor, it doesn't go across distribution switches!

cisco say if you can design your network right, logically in blocks (keep it simple) it helps you

use all these technologies/features/best practices as they should be and it will be easy to implement these.

24 - Monitoring - Your Pulse on the Network

SLA (Service Level Assurance) Can also assign tracks to the sla monitors ..... (kept this brief as i use alot of snmp/syslog and IP SLA monitors at work) but these tracks can be assigned to static routes for example, so we can pull routes out of the table and the higher metric route can be used instead, when the ping/reachabilty comes back the tracker installs the route again (which is being tracked) and the higher metric static goes back out of the routing table - PRETTY SWEET

the SLA monitors do all sorts, from dhcp/dns/icmp/voice codes etc also can configure responsders (another router, for more accurate results ie the endpoint in the network)

19 - Wireless LAN - Foundation Concepts and Design 1

Only 1 person can send or receive at a time, more users joining the wireless network the less the performance you get.

The unlicensed bands is an issue (one of the downfalls) ... as there are only 3 clean channels (b+g)

not much you can do if other networks/peoples APs use these channels.... other than changing

over to another wireless standard, but point being is no governing authority you can go to.

We all remember CSMA/CD (just about from our NA studies) which would listen first to see if the wire was free then send data, well with wireless it uses CA (collision avoidance) - sounds familiar right, dig deep in that head, yes thats right, the same as token ring! lol

 

20 - Wireless LAN - Foundation Concepts and Design 2

client joins ap 1, gets 172.16.1.50 then comes into radius of ap 2, the client joins ap 2 ...(but how i hear you ask ...as if we assign him a new ip, all his existing connections with be severed..)

he then pretty much becomes vpn enabled (almost) he gets an encapsulated IP address (so he keeps 172.16.1.50 - thats retained, which is encapsulated within the 2.50 packet) kinda vpn styleeee (kinda on the fly) and vice versa when he goes back into AP1 he is decapsulated.

this keeps all connections ...koooool