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Twitter directory to enterprise IT and network companies | NetworkWorld.com Community

April 14th, 2009
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Twitter directories such as Twellow and the newer WeFollow from Digg founder Kevin Rose can go a long way toward helping you find Twitterers of interest. But when it comes down to compiling a really focused list, you have to get your hands dirty and plunge around through a bunch of individual Twitter accounts, too.

Enterprise IT pros, I’ve done the dirty work for you here and compiled if not the ultimate list of enterprise IT and network companies, at least a pretty good one of about 100 companies. (For those of you I accidentally missed, please make your presence known via the comments box or email me at bbrown@nww.com. You can follow me on Twitter here. Keep in mind, though, that I have tried to limit this list to companies providing IT/network products and services to enteprise IT customers, not to service providers or OEMs. Maybe that’s a list for another time.)

Twitter directory to enterprise IT and network companies | NetworkWorld.com Community

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People, Resources

Nmap Network Scanning

September 1st, 2008

Nmap author Fyodor will soon be releasing Nmap Network Scanning, the official guide to the Nmap Security Scanner. From port scanning basics for novices to the type of packet crafting used by advanced hackers, this book suits all levels of security and networking professionals. Rather than simply document what every Nmap option does, Nmap Network Scanning demonstrates how these features can be applied to solve real world tasks such as penetration testing, taking network inventory, detecting rogue wireless access points or open proxies, quashing network worm and virus outbreaks, and much more. Examples and diagrams show actual communication on the wire. This book is essential for anyone who needs to get the most out of Nmap, particularly security auditors and systems or network administrators.

Publication of Nmap Network Scanning in paper form is expected in September 2008 (with a Defcon pre-release in August). The ISBN number is 9780979958717 (ISBN-10: 0979958717).

Nmap Network Scanning—Official Guide to the Nmap Security Scanner

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Resources, Security

Cisco IOS Simulators - Petri.co.il forums

August 14th, 2008

Dave Davis writes …

March 16, 2007

Here is a list of Cisco IOS Simulators. These can be run on your PC, for testing and learning purposes, instead of using a real router. However, the best option is still a real router, even if it is a $50 router from ebay.com

Cisco IOS Simulators - Petri.co.il forums by Daniel Petri

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Resources

8 ways to strengthen your Cisco networking skills

August 14th, 2008

Dave Davis writes ….

October 18, 2007

In the past couple of weeks, I’ve written a couple of articles about Cisco certification that generated a lot of response from TechRepublic members. The most recent article, “What you need to know about Cisco’s CCNA certification,” garnered a lot of excellent comments, many of which focused on gaining experience.More than once, the old “chicken or the egg” conundrum came to mind as readers asked, “How do I get a Cisco job with no experience, and how do I get Cisco experience without a job?” TechRepublic member nacht probably said it best:“What you have here is a chicken and egg problem: You can’t get the experience because you don’t have the certification, but the certification doesn’t help when you don’t have ‘enough’ experience.”

Eight ways to strengthen your Cisco networking skills | Network Administrator | TechRepublic.com

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Resources

20 useful sites for Cisco networking professionals

August 14th, 2008

Compiled by Jim Duffy and Linda Leung …

If you’re studying for Cisco exams and just about to tear your hair out, don’t fret, there are many others in the same position, and many of them are writing up their experiences in their blogs and passing along hints and tips. Even if you’re a CCIE pro, there’s always room for personal improvement and expansion. With that in mind we’ve scoured the Web to bring you our top 20 most useful Web resources for Cisco networking professionals.

20 useful sites for Cisco networking professionals | NetworkWorld.com Community

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Resources

Subnet and Wildcard Masks

August 26th, 2007

Subnet Mask

Wild-Card Mask

Prefix

255.0.0.0

0.255.255.255

/8

255.128.0.0

0.127.255.255

/9

255.192.0.0

0.63.255.255

/10

255.224.0.0

0.31.255.255

/11

255.240.0.0

0.15.255.255

/12

255.248.0.0

0.7.255.255

/13

255.252.0.0

0.3.255.255

/14

255.254.0.0

0.1.255.255

/15

255.255.0.0

0.0.255.255

/16

255.255.128.0

0.0.127.255

/17

255.255.192.0

0.0.63.255

/18

255.255.224.0

0.0.31.255

/19

255.255.240.0

0.0.15.255

/20

255.255.248.0

0.0.7.255

/21

255.255.252.0

0.0.3.255

/22

255.255.254.0

0.0.1.255

/23

255.255.255.0

0.0.0.255

/24

Resources