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Cisco Offers A Certification Program That Ensures Their Customers Can Always Receive Help From Technicians Who Have Proven Themselves To Be Competent In Cisco Networking Products. These Programs Are Administered Throughout The World At Authorized Cisco Centers. We're Here To Help You Prepare To Become Cisco Certified. As
You Explore This Site, You'll Discover...
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What You Can Expect At The Cisco Testing Center |
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Remember... If You Are Looking For Quality Information Related To Cisco, Add This Site To Your Favorites Right Now, As We Update It Daily With The Latest News And Information Related To Cisco And Similar Topics. Enjoy The Site.
Everything You Must Know About Cisco Routers, Used Cisco Routers, Cisco Training, And Cisco Certification.
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Overclocking Your Cpu to the Extreme
Who Else Wants To Turn There PC Into A Extreme Gaming Rig Without Spending A Single Cent On Hardware? Discover how to unleash over 900% of CPU performance from your PC in a just a few easy steps, then watch in awe as your game's frame-rates double overnight!
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PC Secrets
How to make your computer boot up in mere seconds. Exactly how you can Instantly end any threat of Spyware, Trojans and Viruses destroying your computer from the inside out – for good! Secret Insider settings that with just a few clicks will speed up your computer MULTIPLE TIMES. Instantly And Easily Optimize and Speed Up Slow, Crashing, Freezing Computers Even if You Completely Suck at Computers! Fix For All PC Issues.
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Cisco CCNA Certification: How And Why Switches Trunk
Author: Chris Bryant
Your CCNA studies are going to include quite a bit of
information about switches, and for good reason. if you don't
understand basic switching theory, you can't configure and
troubleshoot Cisco switches, either on the CCNA exam or in the
real world. That goes double for trunking!
Trunking is simply enabling two or more switches to communicate
and send frames to each other for transmission to remote hosts.
There are two major trunking protocols that we need to know the
details of for exam success and real-world success, but before
we get to the protocols, let's discuss the cables we need.
Connecting two Cisco switches requires a crossover cable. As you
know, there are eight wires inside an ethernet cable. In a
crossover cable, four of the cables "cross over" from one pin to
another. For many newer Cisco switches, all you need to do to
create a trunk is connect the switches with a crossover cable.
For instance, 2950 switches dynamically trunk once you connect
them with the right cable. If you use the wrong cable, you'll be
there a while!
There are two different trunking protocols in use on today's
Cisco switches, ISL and IEEE 802.1Q, generally referred to as
"dot1q". There are three main differences between the two.
First, ISL is a Cisco-proprietary trunking protocol, where dot1q
is the industry standard. (Those of you new to Cisco testing
should get used to the phrases "Cisco-proprietary" and "industry
standard".) If you're working in a multivendor environment, ISL
may not be a good choice. And even though ISL is Cisco's own
trunking protocol, some Cisco switches run only dot1q.
ISL also encapsulates the entire frame, increasing the network
overhead. Dot1q only places a header on the frame, and in some
circumstances, doesn't even do that. There is much less overhead
with dot1q as compared to ISL. That leads to the third major
difference, the way the protocols work with the native vlan.
The native vlan is simply the default vlan that switch ports are
placed into if they are not expressly placed into another vlan.
On Cisco switches, the native vlan is vlan 1. (This can be
changed.) If dot1q is running, frames that are going to be sent
across the trunk line don't even have a header placed on them;
the remote switch will assume that any frame that has no header
is destined for the native vlan.
The problem with ISL is that is doesn't understand what a native
vlan is. Every single frame will be encapsulated, regardless of
the vlan it's destined for.
Switching theory is a big part of your CCNA studies, and it can
seem overwhelming at first. Just break your studies down into
smaller, more manageable parts, and soon you'll see the magic
letters "CCNA" behind your name!
About the author:
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage
, home of free CCNA and CCNP
tutorials! Pass the CCNA exam with Chris Bryant!
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Win-Spy Monitoring Software
Monitor Your Home PC Or Any PC Within Your Wireless Network. Monitor A Cheating Spouse. Records Any Password. Monitor Any Email. Monitor Via Webcam And Mic.
|
Computer Repair Home Study Course
Learn How to Repair Your Computer Today! - Save money on costly repairs and even start your own business. Join thousands of others who learned new skills, jump started their careers, made extra money, and started their biz with this Computer Repair Course!
|
Overclocking Your Cpu to the Extreme
Who Else Wants To Turn There PC Into A Extreme Gaming Rig Without Spending A Single Cent On Hardware? Discover how to unleash over 900% of CPU performance from your PC in a just a few easy steps, then watch in awe as your game's frame-rates double overnight!
|
PC Secrets
How to make your computer boot up in mere seconds. Exactly how you can Instantly end any threat of Spyware, Trojans and Viruses destroying your computer from the inside out – for good! Secret Insider settings that with just a few clicks will speed up your computer MULTIPLE TIMES. Instantly And Easily Optimize and Speed Up Slow, Crashing, Freezing Computers Even if You Completely Suck at Computers! Fix For All PC Issues.
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A Quick Note
From The Publisher...
If you like the article above, you may be
interested in the following article which is also related to Cisco...
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Cisco Certification: Selecting Cisco Products |
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You must understand the business requirements of the network before buying a product. Based on the requirements, you can select the appropriate Cisco products. Today, WAN technologies most often take advantage of high-speed connections, such as T-1 and E-1. Additional WAN technologies exist, including Frame Relay, ISDN, and dial-up asynchronous connections. ISDN or dial-up is used if infrequent connection is made. If a connection is used for more than two to four hours, you should use a Frame Relay or a leased line.Based on the different services available through the service provider, you can select Cisco products that can fulfill your office requirements. Selecting Hubs Cisco has various hub products. You can select hubs according to the type of connection required. Higher-end hubs offer network management port and console connections, middle-end hubs offer both 10 Mbps and 100 Mbps auto-sensing connections, and the lower-end hubs offer only 10 Mbps connections. Examples of... |
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