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Archive for February, 2010
Weekly Open Ended Question #2
Feb 18th
This is the second question in a series of OEQs. The first question was pretty popular, and was answered quickly in the comments. The answer to last week’s question has been added to the post.
Second question:
What is the Administrative Distance of an EIGRP Summary Route?
Please post answers in the comments (without Googling)!
Highlight for answer:
The AD of an EIGRP Summary Route is 5.
CCIE Rack Complete!
Feb 16th
Obviously I’m a huge proponent of Dynamips, and I will still be using it, probably more so than the physical hardware. But… I had most of this stuff lying around, so I thought I should put it to use. I’m mirroring the INE topology as best I can with what I have. Here’s my terrible picture (I’m not much of a photog):
(click image for fullsize)
R1 – 2610XM
R2 – 3640
R3 – 3640
R4 – 3725
R5 – 1760 (might replace this one)
R6 – 2801
FR Switch/BB1 – 2621 + NM-8A/S
SW1 – 3560-48
SW2 – 3560-48
SW3 – 3550-48
SW4 – 3550-48
Term Server – 2512 + 2514
BB2 – 2501
BB3 – 2514
3550 vs 3560
Feb 15th
I frequently see people asking if 3550s are sufficient for CCIE lab preparation, or if 3560s are a must. Of the top of my head I know that QoS differs between the 3550 and 3560, and also that the 3550s do not support Private VLANs. Beyond that, I can’t say much. Today I stumbled across a comparison from Internetwork Expert. This is really great information. Here’s what they’ve laid out:
Catalyst 3560 Only Features [12.2(25)SEE2]
Access Switch Device Manager (SDM) Template
IEEE 802.3af Power over Ethernet
IGMP Throttling
IPv6 (Internet Protocol Version 6)
MLD Snooping
Private VLANs
VLAN-Based QoS on Physical Ports
SRR (Shaped Round Robin)
Weighted Tail Drop (WTD)
Auto-MDIX
Weekly Open Ended Question #1
Feb 11th
I need to start working on the miscellany involved in the OEQs for the CCIE R&S. This is the first post in a weekly series of OEQs. Obviously I don’t know exactly what the CCIE questions are going to be, but I’ve found some resources with sample questions, like INE’s CCIE Blog. The plan is to post one question a week with you guys (hopefully) answering in comments. I will update previous week’s article with the answer when posting the new question the following week. First question is easy:
What is OSPF’s metric and how is it determined?
Please post answers in the comments (without Googling)!
Highlight for answer:
OSPF uses a reference bandwidth of 100 Mbps for cost calculation. The formula to calculate the cost is reference bandwidth divided by interface bandwidth. For example, in the case of Ethernet, it is 100 Mbps/10 Mbps=10.
Note: If “ip ospf cost cost” is used on the interface, it overrides this formulated cost.
Passed BGP+MPLS!
Feb 10th
The original plan was to take BGP and MPLS separately, but I was told by a few people to give the composite a try. Since my employer is picking up the tab for two attempts, I figured it couldn’t hurt to try. I was hoping to pass, but I wasn’t too confident. I passed though!
It was pretty tough, but not too bad. There was more ATM than I would have liked, but most of it was basic. Also a lot of drag and drops. The sims were ridiculously easy, which was surprising. It didn’t feel like the exam went as deep into the technologies as I expected.
So I’m a CCIP now, which is awesome. I need to celebrate a little.
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