By LBSources, on November 13th, 2011% One thing that I noticed while studying for the SWITCH exam is that VTP sections always skip a very important note about how VTP can cause a lot of trouble. A lot of folks including me don't use VTP unless we've been told we have to. But the fact still remains it's on our Cisco exams, it has to be explored and that exploration can lead to some of us deploying it. That's why we go and learn about this stuff, to roll it out into production if it makes sense. So from what we all read and experience, choose . . . → Read More: VTP Client Mode – It Can Still Wipe Out Your VTP Server!
By LBSources, on November 9th, 2011% Inter-VLAN Routing Lab Share
This is more or less a copy-n-paste from the post I made over at GNS3-labs.com
So this lab below is fairly easy, not much involved. In fact you could consider it an advanced CCNA switching lab. Call it what you like, but similar questions, labs and scenarios came up on the SWITCH exam when I took it.
Why am I posting it? Simple – as always to share labs! This is the first lab I’ve taken the time to save and compile with tasks and solutions in a long time. So I’m starting out with . . . → Read More: Sharing is Caring – Simple Inter-VLAN Routing Lab, But Core Knowledge..
By LBSources, on November 7th, 2011% WARNING! Not a technical post! More a motivational note for myself
Just a post to update you all on what the heck I’m doing! There are so many great things I should be posting here, but boy it’s so hard to find the time to do it!
So how have you all been? I hope doing well and achieving your dreams and goals as planned for 2011. I’ve been on the slow and steady, but I’m still on the path.
I took the SWITCH exam this past September (2011) and I failed. I failed because I didn’t prepare properly, . . . → Read More: Don’t Worry – Be Happy, But Stay Hungry!
By LBSources, on April 30th, 2011% Some time last year I was invited to demo @BosonSoftware CCNP TSHOOT ExSim-Max and NetSim. At the time, I wasn’t able to play with it too much. But the short time I did toy with it I was intrigued and decided (see here where I was contemplating the purchase) to invest in the SWITCH ExSim-Max right that moment since that’s what I’m currently working on. I wasn’t in full study mode cause it was the holidays, but we’re hoarders so it was a typical move for me; I knew I’d need it later. I also got 10% off the ExSim . . . → Read More: Boson ExamSim and NetSim – CCNP SWITCH & TSHOOT Tools
By LBSources, on February 12th, 2011% Just loading up some more notes that I have laying around. I feel the right thing is to share them. Hope they help someone
Voice VLANs
With voice data the key factor is getting the voice traffic to its destination as quickly as possible in order to avoid jitter and unintelligible voice streams. (“jitter” occurs when there’s a delay in transmitting voice or video traffic, perhaps due to improper queueing.)
Switchports that have IP phones plugged into them can be configured 2 ways:
Trunk port: Gives the advantage of creating a voice VLAN that will carry nothing . . . → Read More: SWITCH Study Notes – IP Telephony & Voice VLANs
By LBSources, on February 12th, 2011% Multilayer Switching And Fault Tolerance
What Is Multilayer Switching?
Multilayer switches are devices that switch and route packets in the switch hardware itself. These switches can perform packet switching up to ten times as fast as a pure L3 router Cisco Catalyst switches perform hardware switching using a router processor or L3 engine Routing information is downloaded to the hardware itself Hardware-based switching happens using one of the following methods: Cisco Express Forwarding (CEF) Newer method Multilayer Switching (MLS) ß Legacy Application-Specific Integrated Circuits (ASICs) will perform the L2 rewriting operation of hardware switched packets. L2 rewriting process changes the . . . → Read More: SWITCH Study Notes – Multilayer Switching And Fault Tolerance
By LBSources, on November 21st, 2010% Wow! Where have I been? In short lets just say I’ve been having a spectacular time at the new employer! So much is going on, I’m learning so much and I’m thrilled at how much I’ve been able to do myself. Its been a little over a month now (started Oct. 4th) and I’ve been involved in some great changes, implementations and planning. I have yet to touch anything other than “the networks”. If you remember I was hired as a hybrid of some sort to span across supporting various technologies supported by my team. I ain’t complaining! My guess . . . → Read More: Getting a Quick Word In!
By LBSources, on September 8th, 2010% Chapter 6 notes.. Chris Bryant’s (@ccie12933) BCMSN study guide!
Passwords
The enable password can be set using “enable password” or “enable secret” commands SW2(config)#enable password yourpassword SW2(config)#enable secret yoursecretpassword The “enable secret” command encrypts the password in the configuration without the “service password-encryption” command. The “enable secret” command supersedes the “enable password” command and this password will be used instead. All passwords appear in the configuration in clear text by default except the enable secret. The command service password-encryption will encrypt the remaining passwords. When configuring VTY lines be sure to enable “login” and set a password or else they . . . → Read More: SWITCH Study Notes – Securing The Switches & Tunneling
By LBSources, on August 19th, 2010% OK – So here we go! The advanced Spanning Tree Protocol. Initially it was kind of simple to keep everything in line – Portfast, Uplinkfast, Backbonefast and it was clear and then came the chaos! BPDU Guard, Root Guard, Loop Guard, BPDU Filtering – and so on. But I held on in there and I think I’ve got the best out of the reading I could for now.
The hardest part of this chapter was the whole RSTP, PVST, PVST+ & RPVST+ business – I mean what the heck. I’ll surely have to go over these again and put together . . . → Read More: SWITCH Study Notes – Advanced Spanning Tree Protocol & Etherchannel
By LBSources, on August 9th, 2010% Below are notes from the Spanning Tree basics chapter. Maybe it's just me but STP seems just as troublesome as it is useful. The advanced chapter didnt seem to let up at all, I still felt like there was a lot to digest. Luckily enough though I was able to move on without any "huh?" moments. But I never feel comfortable with just that – My feeling (with Cisco/networking/IT stuff) is that I've never really learned something until I've planned, implemented and debugged it several times – I think we all feel this way.
As I said I'm catching up . . . → Read More: SWITCH Study Notes – Spanning Tree Protocol Basics STP
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