TCPmag.com
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Sept. 5, 2006
Editor: Becky Nagel (bnagel 1105media.com)
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THIS ISSUE SPONSORED BY:
- Network Learning Inc - Get Cisco Certified NOW!
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- Protecting Virtual Servers with Acronis True Image
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- New from Redmond: 2006 IT Salary Survey Report
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IN THIS ISSUE OF TCPmag.com:
1. Q&A: The VLAN Advantage
2. Interesting Employment in N.C., N.J. and Oregon
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1. Q&A: The VLAN Advantage
Scott,
In this day and age where we have gigabit switching, what is
the real advantage of having VLANs?
My company has about 400 users, and we have three floors in
the building, with each floor as a separate VLAN. Is there
any advantage to doing this? My colleague says we get a
performance gain even though we have a gigabit backbone and
also gigabit switches to the desktop -- is this correct?
Warmest regards,
-- Tony
------------------------------
Tony,
Actually, this argument/thought process goes way back in the
Ethernet days. And it really has a lot to do with how your
network is designed and the applications or operating
systems
running on the network.
Just because you have gigabit Ethernet everywhere doesn't
mean you are running efficiently! Take a look at the
freeways
around Los Angeles. Amazingly enough, 10 lanes of traffic
and
there are *still* traffic jams. Go figure. We just get to
make
mistakes and have problems at much faster speeds than we
used to.
The more bandwidth you have, the less impact any one thing
(working at a static rate of speed, anyway) will have on
your
network. But in real life, we tend to notice that people
frequently find new and exciting ways to eat up any
bandwidth
given to them! Therefore, we need to think about some of
that
traffic engineering on the network side.
VLANs give us a way of organizing and forming traffic the
way
we want to. If engineers in your organization have this
obnoxious habit of running applications that beat on a few
servers all the time, wouldn't it be nicer if that did not
impact anyone else? Or when accounting closes the books at
month-end, that it not slow down everyone else because of
some poorly written accounting application?
Yes, switches make things nicer as well, but depending on
what applications or operating systems use a plethora of
broadcast and/or multicast packets, we aren't really
helping,
are we? VLANs will require a router (or a Layer 3 switch
providing routing services) to communicate between VLANs.
This organization of our traffic flows and who needs to talk
to whom can help everyone play nicely together.
The other good piece about VLANs is that they introduce
virtual barriers between segments of the network where you
can implement security controls. Yes, you can do security
controls at Layer 2 as well, but their implementation for
intra-VLAN filtering can be a bit more complicated to
maintain and administer.
Doing VLANs by floor space may make perfect sense to your
organization's use of the network. It may not make any
sense to someone else's. You can organize by floor, by
department -- by whatever makes sense to you.
But in the end, it's about the network design. And it's
about understanding what is occurring on your network and
making the network work for you instead of you working for
the network.
So while I'm all for adding speed and cool new toys within
a network (10 GB is sweet, by the way!), I think it's much
better to manage the resources that you have and make them
efficient, rather than just trying to add more lanes to the
highway.
Hope that helps,
-- Scott
Scott Morris, quadruple CCIE, JNCIE and all-around
Uber-Geek, can often
be seen traveling around the world consulting and delivering
CCIE
training. He has recently stepped up as VP of Curriculum
Development
for IPexpert and will oversee a new consulting practice. For
more
information on him check out http://www.ipexpert.com.
Send your questions for this column to editortcpmag.com
with the subject line "Attn: Scott."
Miss a Q&A? Go online to http://tcpmag.com/qanda/
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2. Interesting Employment in N.C., N.J. and Oregon
Job postings courtesy of Monster.com.
NETWORK ENGINEER
Company: Network Appliance
Position Type: Full-time
Location: Research Triangle Park, North Carolina
Salary: Not given
Experience: 7 to 10 years
Desired Education and Certs: B.S. in C.S., CCIE or
Equivalent
This position is responsible for the worldwide network.
Candidates
must have extensive experience designing and engineering
WANs,
Data Center networks and other technologies.
For more information, see the job listing at:
http://jobsearch.monster.com/getjob.asp?JobID=47
532890&AVSDM
-----------------------------
TECHNICAL TRAINER
Company: New Horizons
Position Type: Full-time
Location: Iselin, NJ
Salary: Not given
Experience: 2 to 5+ years
Desired Education: MCSE, MCT, A+, Linux+, CCNA
This New Horizons Computer Learning Center is looking for an
MCT
with a CCNA and other certifications to become a full-time
instructor. Network Admins/Engineers with a passion for
teaching
are encouraged to apply.
To learn more, visit:
http://jobsearch.monster.com/getjob.asp?JobID=47
528435&AVSDM
-----------------------------
HARDWARE ENGINEER III
Company: ADP
Position Type: Full-time
Location: Portland, Oregon
Salary: Not given
Experience: 9 to 13 Years in Product Development
Desired Education: EE or CS Degree, Cisco Certification
ADP is looking for an engineer with extensive knowledge of
network and wireless LAN products to help develop hardware
products.
To learn more, visit:
http://jobsearch.monster.com/getjob.asp?JobID=47
488359&AVSDM
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SPONSOR: New from Redmond: 2006 IT Salary Survey Report
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Good news underscores the results of the 11th salary survey
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Get the entire report from the Redmondmag.com Tech Library!
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