| Editor's note: We will be changing how we send out Network World newsletters over the next few weeks. To ensure future delivery of your newsletters, please add nww_newsletters@newsletters.networkworld.com to your e-mail address book or 66.186.127.216 to your white-list file. Thank you. Experts flag Internet's scalability problems Recently, experts have turned up the volume on questions about the scalability of the Internet using the technologies and techniques of today. Is the Internet doomed to fail? Sounds like a crazy question, in this era of Facebook, Twitter and a "digital millennial" generation that's grown up never not knowing the Internet. Performance tiers and testing needed for 802.11n As noted last time, new types of potentially attractive, useful 802.11n products are set to emerge that the Wi-Fi Alliance is currently not equipped to test and certify. 100 Gigabit Ethernet: Bridge to Terabit Ethernet IT managers who are getting started with - or even pushing the limits of - 10 Gigabit Ethernet in their LANs and data centers won't have to wait long for higher speeds. Pre-standard 40 Gigabit and 100 Gigabit Ethernet products are expected to hit the market later this year. Controversial Einstein systems to inspect U.S. government's Internet traffic The largest U.S. carriers -- including AT&T, Qwest and Sprint -- are deploying special-purpose, intrusion-detection systems dubbed Einstein boxes in their networks as part of an 18-month-old effort to tighten security on federal networks. Cisco sales pipeline is thawing Cisco Subnet blogger Brad Reese says that with healthy services revenues offsetting product softness, we can expect Cisco to close the quarter with a book to bill greater than 1.0. How it works: Net monitoring & management Find out how management software works, and what you need to know to buy the right tool. Overcoming FUD in the secondary Cisco market Cisco Subnet blogger Brad Reese shares the results a survey suggesting the secondary Cisco market is overcoming the fear, uncertainty and doubt that previously clouded suppliers that were not Cisco registered partners. Building a CCNA lab for a few hundred dollars Cisco Subnet blogger Wendell Odom wraps up his series on what to buy for a CCNA/CCNP lab by bumping the budget up to $300 to $400. April giveaways galore
Cisco Subnet and Microsoft Subnet are giving away training courses from Global Knowledge, valued at $2,995 and $3,495, and have copies of three hot books up for grabs: CCVP CIPT2 Quick Reference by Anthony Sequeira, Microsoft Voice Unified Communications by Joe Schurman and Microsoft Office 2007 On Demand by Steve Johnson. Deadline for entries April 30. Network World on Twitter Get our tweets and stay plugged in to networking news. | 
From 3Mbps over shared coax to 40/100Gbps over fiber…and beyond.
iPhone enthusiasts from around the Web offer their visions for the next-gen iPhone.
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