The stats helper monkeys at WordPress.com mulled over how this blog did in 2010, and here’s a high level summary of its overall blog health: The Blog-Health-o-Meter™ reads This blog is doing awesome!. Crunchy numbers A Boeing 747-400 passenger jet
Closing in on the written
I have finished my second read of the certification guide. Now it is time to do some serious studying with the questions from the book and from the Boson software I bought a couple of weeks ago. Every answer I
INE – 35% off self paced training
INE has a year end deal for self paced training with 35% off. I just purchased some tokens for rack rentals. So if you need to buy some workbooks or do rack rentals now is a good time to do
CCIE lab exam environment
Preparing some stuff at home to be as prepared as possible when my day comes to do the lab. I live in Sweden but I have ordered an english (US) layout keyboard since that is what is used at the
200 hours done
So hit 200 hours today. Closing in on the written, have a few more chapters to read and then study questions with Boson and the cert guide. Probably approaching 20% done of the CCIE as I calculate that I need
IP forwarding – notes
Fast switching First packet to a specific destination IP is process switched. With the first packet the router adds an entry in the fast switch cache, also called route cache. The cache contains the destination IP, data link header information
IP services – Notes
ARP Address Resolution Protocol, used to discovery layer two address when IP address is already known. Uses protocol 0x0806 compared to Ethernet which uses 0x0800. At layer two an ARP request is a broadcast since the MAC address of the
Spanning tree – notes
Electing the root Only one switch can be the root bridge. From the start all switches announce themselves as the root, when a switch hears of a superior BPDU it stops announcing itself as the root and instead forwards the
VLAN – Notes
Private VLANs Commonly used in SP networks to put users in common subnet but no direct forwarding of packets between customers in same VLAN. Enforce security by forcing traffic to go through router instead of switched locally. There are three
Ethernet – notes
RJ 45 pinouts 10-BASE-T and 100BASE-TX uses pairs two and three, gigabit Ethernet uses all four pairs. Pinout for straight cable: 1-1;2-2;3-3;6-6 Pinout for crossover cable: 1-3;2-6;3-1;6-2 A standard PC transmits on pair one and two and receives on three