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ALSO CALLED: Virtual Local Area Networks Hardware, Virtual Local Area Networks Software, IEEE 802.1q, Logical LAN, Virtual LAN Hardware, VLAN Hardware, VLAN Software, Media Access Control Bridges, Virtual Local Area Networks, MAC Bridges, Virtual LAN Software, VLANs, 802.1q, Virtual LAN, Virtual LAN Appliances, Virtual Bridged LAN, Virtual Bridged Local Area Networks
DEFINITION: VLAN hopping (virtual local area network hopping) is a method of attacking a network by sending packets to a port that is not normally accessible from a given end system. (A VLAN is a local area network with a definition that maps devices on some other basis than geographic location - for example, by department, type of user, or primary application.) A VLAN hopping attack can occur in either of two  … 
Definition continues below.
VLANReports
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Understanding the pros and cons of network virtualization
sponsored by SearchSecurity.com
EGUIDE: This expert E-Guide from SearchServerVirtualization.com explains the benefits of virtualizing the network. Find out how to utilize this technology to combine multiple networks into a single logical network. Plus, get answers to common questions about network virtualization technology to ensure a smooth transition.
Posted: 29 Nov 2011 | Published: 29 Nov 2011

SearchSecurity.com

E-Guide: Virtualization implementation and management: A network perspective
sponsored by SearchSecurity.com
EGUIDE: Virtualization has become a reality in the networking world. It is vital for professionals to understand how server virtualization and networks affect each other.
Posted: 21 Nov 2011 | Published: 21 Nov 2011

SearchSecurity.com

Integrating Physical and Virtual Networking – Virtualized Server Connect to the Data Center Fabric
sponsored by Enterasys
WHITE PAPER: Server virtualization has affected all facets of the data center – from servers to storage to the network. While the promise is a reduced capital investment, higher agility and lower operational expenses, the success of server virtualization depends on the integration of both the physical and the virtual network. This has its own set of challenges.
Posted: 22 Nov 2011 | Published: 21 Nov 2011

Enterasys

What Is an Ethernet Fabric?
sponsored by Brocade
WHITE PAPER: Compared to classic hierarchical Ethernet architectures, Ethernet fabrics provide the higher levels of performance, utilization, availability and simplicity required to meet the business needs of data centers today and into the future.
Posted: 15 Nov 2011 | Published: 31 Aug 2011

Brocade

Improving the Experience and Economics of the Campus Network
sponsored by Juniper Networks, Inc.
WHITE PAPER: Most companies today are implementing mobility applications to establish closer relationships with their employees, suppliers and customers. Mobility applications enable the sales force to be extremely reactive, stay connected to their customers, and act on new opportunities in literally seconds.
Posted: 02 Sep 2011 | Published: 02 Sep 2011

Juniper Networks, Inc.

Simplify VMware vSphere* 4Networking with Intel® Ethernet 10 Gigabit Server Adapters
sponsored by Intel
WHITE PAPER: Server virtualization can quickly result in excessively complex network ports if you don't have a plan. This white paper explores the factors that can lead to GbE port bloat, including physical server connection paradigms and security procedures. 
Posted: 05 Jul 2011 | Published: 05 Jul 2011

Intel

Ten top problems network techs encounter
sponsored by Fluke Networks
WHITE PAPER: This whitepaper discusses ten common problems encountered by technicians today and their symptoms, causes, and resolutions.
Posted: 18 Apr 2011 | Published: 18 Apr 2011

Fluke Networks

Juniper Lights Up Commercial Buildings with High-Flying WLAN Services
sponsored by Juniper Networks, Inc.
CASE STUDY: Commhub faced consecutive hurdles when it came time to select a wireless LAN system for the structure. The challenges included how to address concerns over network security,management, shared services and guest users, says Dominick Arcuri, CTO for Spot On Networks/Commhub.
Posted: 28 Mar 2011 | Published: 28 Mar 2011

Juniper Networks, Inc.

BGMX Retail Solutions Case Study
sponsored by SonicWALL
CASE STUDY: BGMX's primary challenge is having the proper bandwidth to adhere to all VLAN specifications in PCI compliance standards. Desko also must meet even tighter SAS-70 regulations, as well as his bank's internal security guidelines.
Posted: 14 Feb 2011 | Published: 14 Feb 2011

SonicWALL

Virtual Chassis Performance: Juniper Networks EX Series Ethernet Switches
sponsored by Juniper Networks, Inc.
CASE STUDY: Juniper Networks commissioned Network Test to assess the performance of Virtual Chassis technology on its EX Series Ethernet switches, especially in the areas of latency and high availability. The key objectives were to determine whether Virtual Chassis configurations would provide low latency and fast recovery from network failures.
Posted: 06 Dec 2010 | Published: 06 Dec 2010

Juniper Networks, Inc.

Ten top problems network techs encounter
sponsored by Fluke Networks
WHITE PAPER: This white paper discusses ten common problems encountered by technicians today and their symptoms, causes, and resolutions.
Posted: 14 Oct 2010 | Published: 14 Oct 2010

Fluke Networks

The Top 5 VoIP Problems and How to Solve Them
sponsored by Fluke Networks
WHITE PAPER: This paper examines each of these problems and addresses how the ClearSight Analyzer can be used to isolate the cause of the problem.
Posted: 10 Sep 2010 | Published: 10 Sep 2010

Fluke Networks

Advanced Virtualization E-Book: Hypervisor Management and Optimization
sponsored by Dell, Inc.
EBOOK: All hypervisors essentially do the same job, but not in the same way. The three top hypervisors all have differences that require specific management tactics. Read this e-book to learn best practices and recommendations you can follow to optimize and maintain VMware ESX, Microsoft Hyper-V, and Citrix XenServer.
Posted: 25 Aug 2010 | Published: 25 Aug 2010

Dell, Inc.

Vyatta System Quick Start Guide
sponsored by Vyatta Inc.
PRODUCT LITERATURE: Vyatta delivers the features, performance, and reliability of an enterprise-class secure router with the added benefits of flexible deployment options, freedom to integrate applications, and the economic advantages of commodity hardware and components. Read this manual to learn more about the Vyatta system and how easy it is to try it out.
Posted: 22 Sep 2009 | Published: 22 Feb 2009

Vyatta Inc.

EtherScope Network Assistant -- Free Hardware Trial
sponsored by Fluke Networks
PRODUCT DEMO: First responders to network emergencies need to solve problems fast on 10, 100 and Gig copper, fiber and wireless LAN networks. This tool helps frontline network professionals quickly solve the wide range of problems they encounter.
Posted: 04 Feb 2009 | Premiered: 04 Feb 2009

Fluke Networks

Airports Use Network Virtualization to Consolidate and Scale Operations
sponsored by Cisco Systems, Inc.
CASE STUDY: The Cisco Catalyst 6500 Series Switch with Supervisor Engine 720-3BXL enabled Unique at Zurich Airport to successfully implement network virtualization using MPLS VPN technology.
Posted: 13 Jan 2009 | Published: 12 Jan 2009

Cisco Systems, Inc.

eGuide: Meshing Virtual Machine and Physical Systems Management
sponsored by Dell and Microsoft
EGUIDE: This paper explains how to provide adequate network redundancy and isolation, how to implement adaptive automation practices for high availability, and how to take advantage of the best tools to eliminate separate virtual and physical management structures.
Posted: 17 Dec 2008 | Published: 17 Dec 2008

Dell and Microsoft

Dell Networking Solutions Guide for Microsoft Hyper-V
sponsored by Dell and Microsoft
WHITE PAPER: This solutions guide details the four available networking configurations, and the advantages and disadvantages of each with an emphasis on typical Dell system configuration and the hardware offerings.
Posted: 11 Dec 2008 | Published: 11 Dec 2008

Dell and Microsoft

The Case for Virtual Local Area Networks (VLANs)
sponsored by Global Knowledge
WHITE PAPER: In this whitepaper you will learn about the evolution of Ethernet, the reasons VLANs were introduced, and the ways that VLANs can be used.
Posted: 10 Dec 2008 | Published: 10 Dec 2008

Global Knowledge

Switching Essentials: An Introduction to Network Switching
sponsored by Global Knowledge
WHITE PAPER: In this white paper, we will address the basics of this Layer 2 technology and help you get your network switch up and running. For our examples, we will use Cisco's 2950 switch.
Posted: 10 Dec 2008 | Published: 11 Oct 2008

Global Knowledge

Solving the Mysteries of Subnetting
sponsored by Global Knowledge
WHITE PAPER: Subnetting is a complicated topic that has confused students for a very long time, however, subnetting is an important topic for many different certifications with various vendors, including Cisco.
Posted: 10 Dec 2008 | Published: 11 Oct 2008

Global Knowledge

Keeping Your Head above the Cloud: 7 Data Center Challenges before Going Virtual
sponsored by F5 Networks
WHITE PAPER: This White Paper details seven data center challenges before deploying a virtual data center.
Posted: 07 Oct 2008 | Published: 07 Oct 2008

F5 Networks

Optimized Metro Aggregation Network for Triple Play Services
sponsored by ECI Telecom
WHITE PAPER: Learn how the convergence of voice, video and data ("Triple Play") together with relaxed regulatory control have forced service providers to shift towards a combined offering of voice, video, and data service improving their position in the market
Posted: 22 Jul 2008 | Published: 01 Jul 2008

ECI Telecom

The ECHO™ - Cisco Connection: ECHO™, and How It Interacts with Cisco's CallManager
sponsored by Teleformix
WHITE PAPER: Read this white paper and learn how ECHO's direct digital integration with Cisco's VoIP network enables the pooling of voice VLAN ports through SPAN or RSPAN.
Posted: 11 Jul 2008 | Published: 01 Jul 2007

Teleformix

The ECHO™ - Avaya Connection: ECHO™, and How It Interacts with Avaya's Telephony Solutions
sponsored by Teleformix
WHITE PAPER: Read this paper to learn how Teleformix's ECHO™ digital recording solution integrates seamlessly with Avaya's telephony systems, providing your company with a crucial customer service tool - quality assurance recording.
Posted: 11 Jul 2008 | Published: 01 Jul 2007

Teleformix
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VLAN DEFINITION (continued): …  ways. If a network switch is set for autotrunking, the attacker turns it into a switch that appears as if it has a constant need to trunk (that is, to access all the VLANs allowed on the trunk port). In Cisco's Dynamic Trunking Protocol (DTP), the susceptibility of a system to this form of VLAN hopping can be minimized by turning off the autotrunking feature (DTP off) on all switches that do not need to trunk. In the second form of VLAN hopping, the hacker transmits data through one switch to another by sending frames with two 802.1Q tags, one for the attacking switch and the other for the victim … 
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