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8372 Views 9 Replies Latest reply: Aug 27, 2012 7:01 PM by Jared RSS

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640-864: Describe the Methodolgy used to design a network

Jul 13, 2012 12:47 PM

Jared 5,547 posts since
Jul 27, 2008

Hello all,


With some of the comments and queries that have been in the CCDA area and CCDA Study group of CLN, I have been comtemplating re-starting some organized discussions.  Now, I am also studying for some CCNP Wireless material and have been focusing on wireless pretty heavily for the past couple of years.  Well, with the feedback in the CCDA areas, I am thinking I may take a break and divert to design.


There was a series of discussions that were started by Travis a couple of years ago and they were some great discussions with great feedback and insight from many CLN members.  Due to lack of time and interest, those discussions kind of died off and we really never got through everything.  Also, they were based on the old 640-863 testing objectives.  As we all know, the CCDA has been updated since then.  These discussion are still a great read and I would encourage people to go back and refer to them.


So, I would like to re-launch these discussions only focus on the 640-864 testing objectives.  My personal goal is to actually nail out the CCDA exam this time around.  Last time, I had fun studying, but was mostly doing it for the learning and the for the certification.  This time around, I am going to focus on learning AND certification.  These new discussions are not meant to replace what was done previously but to enhance our focus to the current 640-864 exam.


With that here are the objectives for the first discussion:

Describe the Methodology used to design a network

  • Describe developing business trends
  • Identify Network Requirements to Support the Organization
  • Describe the tools/process to characterize an existing network
  • Describe the top down approach to network design
  • Describe Network Management Protocols and Features


Happy discussing!

  • MissingLink89 20 posts since
    Jun 17, 2009

    Business trends of today seem to be a "Unified Network" this means that we bring together data, voice and video on the same network.  With the technologies available this is plausible.  We can save a significant amount of money by intergrating VOIP to our network.  It's simply in some cases running another VLAN on the switch (2 switches in 1!).  Also business seem to be having this buzz word "Cloud Computing" all well and good till you lose you internet connection and you don't have access to these resources, so building a redundant topology comes into play in the design.  Also discussed in the book is a thing called Borderless Networks Architecture where we can have a worker at their own home or on the road have access to network resources (shared drives, intranet and voice calls).  Identifying what is critical to the business.


    When we design a network we need to know what requirements are needed, do we need a backup internet connection?  Do we need QoS on our VOIP calls?  Does a certain bit of software need reliable fast throughput to the servers?


    Now for network auditing tools to help in characterizing the network there is a range to chose from.  Some vendors have their own and there are 3rd party tools as well.  (I don't know alot in this area so feel free to add in).  The main ones I keep seeing come up in my studies are NetFlow and NBAR, these tools analyse traffic flows and give details on application ports (anyone used these before? give us some more info?)

    Also existing documentation (if there is any =P) can be helpful in auditing the network.  I'm sure we've all been there when there is jack all doco or it hasn't been updated for 10years (gotta love it).


    The top down approach for network design is essentially refering to the OSI model, come on now we should know this off by heart.  Application, Presentation, Session, Transport, Network, Data Link, Physical.  We seperate these into two where we define the requirement of the upper layers (Application, Presentation, Session) which to me appear to be software or services like voice and video.  And then we define the infrastructure for lower layers (Transport, Network, Data Link, Physical) so we design the infrastructre around the applications.  So we may want have QoS on our VOIP transport or we may engineer network traffic to transport data over a certain link thats faster and reliable.  It's pointless if we design from the bottom up because we can run into challenges where the infrastructure doesn't allow for a certain application or service because we were ignorrant to the requirements.


    One management protocol that comes to mind is SNMP (Simple Network Management Protocol).  SNMP is used to report information to a controller, it's quite useful in managing a network where we can recieve alerts if a port goes down or we are getting a lot of Transmit and Recieves on a certain link.  It can be configured for certain information but I'm not familiar with this and struggle to discuss this but theres a whole chapter from memory about it in our books.  Definately worth a read and one to research further out of interest.

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  • rmhango 579 posts since
    Aug 12, 2008

    MissingLink89 wrote:


    Business trends of today seem to be a "Unified Network" this means that we bring together data, voice and video on the same network.

    Not quite, that business trend was back in the 20th century (over 10-years ago) and the term used to describe it was 'Convergence', with Cisco introducing their 'Architecture for Voice, Video and Intergrated Data' (AVVID).


    I think today you'll find the main business trends they're referring to are Data Centre Virtualisation and Cloud Computing, with the 'Unified Network' referring to Compute, Network and Storage, not VoIP!

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  • Matt Saunders - Community Manager 2,834 posts since
    Jun 18, 2012

    Jared - If you plan to make this a regular thing, I'd love to help you promote it...

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  • slicerpro 4 posts since
    Jul 13, 2009

    Let Matt promote this and hopefully we will see some great material and contributions

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  • Matt Saunders - Community Manager 2,834 posts since
    Jun 18, 2012

    Thanks Slicepro - I featured the thread in my Monday morning blog too. The blog area is still picking up traction, but I'll continue to work to help this grow. I think it's great.

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  • I think a lot of people look at the CCDA and go "I want to learn how to design!!!".  The CCDA is just the entry level - it's not how to design, it's the basic foundational concepts that you need to have to start building your design skillset.


    A lot like ITIL - nobody wants to do the foot work to learn it, but everyone loves the benefits once someone in your organization can do it.

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