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Showing posts from 2009

Re-certified CCIE 20572

Finally done with that on last Friday 28th, that test was like a stone over my chest, with all my work and family I had almost no time for studding but I did it anyhow. So now for additional 2 years I can unchange my signature :-). The test was not that hard (ver3) I think the hard was the anticipation for a hard question that will fail me.

DCOF – Data Center of the Future

yesterday we had a virtual event provided by some of the leaders in Data Center Computing (Cisco, VMware, EMC, Oracle, NetApp, APC, EMERSON) the web virtual Event entail some of the challenges and current design's as well as future design and solutions we may encounter in Data Centers. From my prospective the main event where the 2 first presenters Cisco and VMware, both have joind forces to show you how the Data Center of the Future should look like, VMware as the Application infrastructure and Cisco as the Networking complimentary. We will expect to see them more and more in Data Centers providing High Availability Fault tolerance and network resilience between Data Centers. Some of the hot discussed topics where the: VN-link – amazing Cisco Nexus 1000V basically that is a replacement for vSwitch (VMware layer 2 switch on ESX/ESXi) and I will add to it an amazing with huge amount of capabilities in compare to the vSwitch under the ESX/ESXi. FCOE – Fiber Channel Over Ethernet std…

CCIE Re-certification

I have had in the past months much considerations to take before I am starting the process again of studying for my certification, some of the considerations I will share with you (some I will leave to my self). 1) Time - that is the main point as in the last 1.5 years since the CCIE my work had become so hectic and demanding that I barely have time for my family let alone my self. 2) Money - yes you would think becoming a CCIE would win you the jackpot but I would share with you a secret it will not (may be for some lucky ones) the financial crises had got to all. 3) Family - I have 1 wife 1 son and 1 in the oven (we say tphoo tphoo tphoo like touch wood). so I need again to split my self into several pieces hopefully I would be able to reassemble all back (transformers...). 4) Work - Yes work this is the place my pay check come from, again split my self. 5) Should I consider a different track - I gone back and forward on that question over and over. 6) What material to take - again…

TCP Window Scale

One of the overlooked subjects especially when it come to the CCIE RS is the real deep knowledge and understanding of TCP, the one subject from the scope of TCP that I would like to pass to you readers is the concept of Window Scaling. Why do we need window scaling or what the hell is it?! First may be lets start with the why, I do not know about you guys but when I am buying something I expect to utilize it fully and not half way, and the same goes to my Internet line if I buy 10Mbps pipe I do not want to utilize only 5Mbps. So What is Window Scaling and how can he help us better utilize our pipe?! Window Scaling is an optional enhancement that allows us to extend our window size so you say wait why do I need to extend my window size? Well normally the window size is 16 bit with a max size of 64K byte and when you are talking about a in your LAN delay (1ms avg) that is more then enough for just above 500Mbps but when we are over the WAN we start experiencing some delays the amoun…