Networking
Top Stories
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Tip
08 Sep 2026
API-first networking considerations for IT leaders
API-first network infrastructure offers benefits and flexibility, but enterprises must plan their deployments carefully to ensure their networks aren't exposed to new threats. Continue Reading
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Tip
08 Sep 2026
How InfiniBand vs. RoCE compare for AI networking
InfiniBand and RoCE both offer distinct advantages to companies determining the best way to support their AI training strategies. But the cheaper option might not be the best one. Continue Reading
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Feature
29 Nov 2012
Will we ever need 400 Gigabit Ethernet enterprise networks?
With 40 and 100 Gigabit Ethernet so new, what could possibly drive the need for 400 Gigabit Ethernet in the enterprise? Hint: It’s not just the WAN. Continue Reading
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Tip
18 Oct 2012
Using vSphere distributed switches for virtual networks
VMware's vSphere distributed switch is shared between hosts in a network, unlike standard switches. Here's how to create and use distributed switches. Continue Reading
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Report
18 May 2012
Interop 2012: Conference Coverage recap
Check out our news, views and video from Interop 2012 in Las Vegas, which covered new service offerings, product announcements and networking trends. Continue Reading
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Answer
04 Apr 2012
How do I disable VPN passthrough? What are the pros and cons to disabling it?
In this Ask the Expert response, Rainer Enders explains how to disable VPN passthrough and what the benefits and drawbacks are. Continue Reading
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Feature
27 Feb 2012
Turf war: Systems vs. networking at the virtual edge
Network engineers fight to gain visibility and management control in a virtual environment. Continue Reading
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Tip
24 Jan 2012
Network time synchronization for VMware ESXi: Timing is everything
Time is money, and in your VMware infrastructure, network time synchronization ensures that your ESXi hosts are timed to work correctly with other hosts and services. Continue Reading
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Photo Story
04 Jan 2012
Mobile network management applications offer monitoring on the go
As smartphone and tablet devices in the enterprise grow, vendors are developing mobile network management apps for iOS and Android, offering accessible views into the network. Continue Reading
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Tutorial
28 Jul 2011
ADSL IP VPN advantages and disadvantages
Find out the ADSL IP VPN advantages and disadvantages before upgrading your enterprise wide area network (WAN) link to this telecom service. Continue Reading
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News
23 Sep 2010
Next-generation firewalls not ready to replace all legacy firewalls
Application-aware firewalls enhance network security by offering deeper visibility, but enterprises will hang on to old-style firewalls. Continue Reading
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News
16 Sep 2010
Networking vendors aim to improve server virtualization security
Server virtualization security is no longer guaranteed by creating physical security zones for different classes of virtual machines on host servers. Networking and network security vendors are introducing virtual security products that apply security controls and policies directly to virtual machines within virtual hosts. Continue Reading
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Tip
17 Aug 2010
Using virtual appliances and desktop virtualization
IT organizations are implementing desktop virtualization and virtual appliances for virtual WAN optimization and virtual application delivery, but there are challenges to overcome along the way. Continue Reading
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Tutorial
12 Mar 2010
Cloud computing network primer
Cloud computing network architecture is moving toward a flat, leaf-spine topology, enabling reduced latency and balancing bandwidth, providing any-to-any connectivity within and between servers. Learn more in this primer. Continue Reading
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Feature
18 Dec 2009
Avaya-Nortel acquisition: Infamous end; questionable beginning
The Avaya-Nortel acquisition was one of the more notable top networking stories of 2009, marking the end of a legacy player and a questionable beginning for Avaya as it struggles with whether to integrate the Nortel data networking portfolio. Continue Reading
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Feature
15 Jul 2009
Configuring virtual networking for Microsoft Hyper-V
In this chapter excerpt from "MCTS: Windows Server Virtualization Configuration Study Guide: (Exam 70-652)," you'll learn about the various tools that can help with virtual networking configuration tasks. Continue Reading
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Answer
04 Feb 2009
Difference between circuit-switching and packet-switching in examples
What is the difference between a circuit switching and packet switching? Our networking fundamentals expert gives examples of packet switching and circuit switching in this response. Continue Reading
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Answer
04 Feb 2009
VLANs versus IP subnets: Why use a VLAN over IP subnetting?
A virtual local area network (VLAN) is better than IP subnetting because its advantage is security. Learn what a VLAN is and how it differs from creating IP subnets, in this expert response from our networking fundamentals expert. Continue Reading
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Feature
19 Dec 2008
Network virtualization explained
Virtualization has moved beyond just server and storage capacities and now encompasses the network as well. Learn about network virtualization considerations to understand before deployment, some major opportunities in network virtualization for solution providers and how to take advantage of these opportunities. Continue Reading
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Tip
17 Dec 2008
Avoid high-risk data commingling with VMware virtual networks to prevent security vulnerabilities
Avoid security vulnerabilities caused by placing VMware ESX and ESXi data of varying security and classification levels on a converged network by understanding how storage and virtual machine data interoperates over various networks. Continue Reading
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Feature
01 Dec 2008
Implement access control systems successfully in your organization
Access control is an important step toward mitigating an organization's security risks. Learn the importance of an access control system and how to implement it successfully. Continue Reading
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Feature
11 Nov 2008
Network design documentation
Inadequate network documentation can lead to a multitude of problems for solution providers. Learn the importance of network documentation and what network design documentation a solution provider needs from customers. Continue Reading
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Feature
27 Oct 2008
Network design considerations checklist for providers
There are many network design considerations that every solution provider should take into account before embarking on a network design project. Knowing these trends and caveats will help you make the best network design planning and network design choices for your customer. Continue Reading
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Tip
28 Apr 2008
Teaming NICs achieves load balance and failover on VMware ESX
By grouping, or teaming, network interface cards (NICs), you can achieve better load balancing and failover capabilities for VMware ESX guest virtual machines. Continue Reading
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Tip
21 Apr 2008
How to configure wireless access points
A crucial part of any WLAN installation is configuring wireless access points. Learn which configuration options -- such as IP address, transmit power and beacon interval -- are best for your customers. Continue Reading
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Tip
27 Feb 2008
Troubleshooting remote scripting using Network Monitor 3.0 -- Managing Windows networks using script
Learn how to use Network Monitor 3.0 for troubleshooting a remote scripting error in this tip originally published on WindowsNetworking.com. Continue Reading
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Tip
03 Oct 2007
Use Netstat to determine which ports to open on a Windows firewall
When troubleshooting a Windows XP firewall, the solution is often simply opening the right firewall port. But what port should you open? This tip walks you through using Netstat to identify which firewall port an application uses. Continue Reading
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Tip
18 Jul 2007
Optical networks: Core network design best practices
Core optical network design must take into consideration network requirements specific to the core, including a high degree of aggregation, low reconfigurability, and large geographic scope, while confronting such challenges as router adjacency, service interconnection and overall management. Continue Reading
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Feature
10 Jul 2007
Verify the CEF Forwarding Information Base table
Learn how to take a stepwise approach to troubleshooting the Cisco Express Forwarding FIB table, a critical part of any methodology for resolving Cisco IP connectivity issues. Continue Reading
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Answer
23 May 2007
CDMA and gold code
Gold code sequences used in CDMA allow callers to better use available bandwidth with less interference. Continue Reading
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Answer
20 Apr 2007
What equipment do I use to connect two LANs in different cities? What are the steps?
How do you connect two LANS from different cities? VPN expert Sampath Ramaswami notes the steps to be taken, in this Q&A. Continue Reading
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Tip
22 Feb 2007
Cisco wireless access point configuration from scratch
Learn what the Cisco 1242 wireless access point can do for you and how to configure one from scratch. This tip covers basic security settings, enabling the wireless radios, and how to make a successful connection. The 1242AG is a powerful business-grade wireless AP with lots of features. Continue Reading
- Answer 31 Jan 2007
- Tutorial 29 Jan 2007
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Answer
25 Nov 2006
Half duplex vs. full duplex Ethernet 10BASE-T topologies
Ever wonder why half duplex Ethernet 10BASE-T topologies have a slower data transmission rate than full duplex Ethernet 10BASE-Ttopologies? Find out in this expert response by Lindi Horton. Continue Reading
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Answer
25 Nov 2006
What are the fundamental principles of CDMA?
In this Q&A, our expert, Lindi Horton gives us an explanation of what CDMA is and what some of its fundamental principles are. Continue Reading
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Tip
20 Nov 2006
IP addressing and subnetting: Calculate a subnet mask using the subnet's formula
IP addressing and subnetting are an important part of networks. Learn how the subnet's formula works and why it's important to know how to calculate the subnet mask "longhand." Continue Reading
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Tip
28 Aug 2006
Duplex mismatch
What is duplex, and what is the difference between half and full duplex? What is a duplex mismatch? How can autonegotiation help or hurt your network? How can you resolve duplex conflicts? In this tip, David Davis helps networking engineers and newcomers understand the issues behind one of the most troublesome problems plaguing today's networks. Continue Reading
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Definition
07 Aug 2006
Kbps (kilobits per second)
In the U.S., Kbps stands for kilobits per second (thousands of bits per second) and is a measure of bandwidth (the amount of data that can flow in a given time) on a data transmission medium. Continue Reading
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Feature
10 Apr 2006
Wi-Fi vulnerability assessment checklist
Vulnerability assessments can help you find and fix WLAN weaknesses before attackers take advantage of them. But where do you start? What should you look for? Have you covered all the bases? This checklist will help to answer these questions. Continue Reading
- Answer 07 Nov 2005
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Definition
21 Sep 2005
well-known port numbers
The well-known port numbers are the port numbers that are reserved for assignment by the Internet Corporation for Assigned Names and Numbers (ICANN) for use by the application end points that communicate using the Internet's Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP). Continue Reading
- Answer 20 Jul 2005
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- Answer 31 May 2005
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Tip
17 Mar 2005
Focus Windows port scanning with the netscan command
How to use the netscan command to focus Windows port scanning. Continue Reading
- Answer 17 Mar 2005
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- Answer 24 Feb 2005
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- Answer 15 Feb 2005
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Feature
14 Feb 2005
Most popular viruses and hacking tools
Here are 2004's most popular hacker tools, viruses, remote tools, adware, spyware, Trojans and worms. Continue Reading
- Answer 10 Feb 2005
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- Answer 31 Jan 2005
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Answer
11 Jan 2005
Can you assign an IP address ending in .0 or .255?
Learn how to assign an IP address ending in .0 or .255 from networking fundamentals expert Chris Partsenidis in this Q&A. Continue Reading
- Answer 22 Nov 2004
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Tutorial
07 Oct 2004
Routing First-Step: IP header format
Routing and Internet addressing are two important concepts involved in networking. Routing First-Step covers the basics of routing in clear, easy-to-understand language. Continue Reading
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Tutorial
26 Jul 2004
Five critical planning steps for wireless LANs, Step 5: Manageability -- Switching to WLAN switches
This article explains how WLAN switches will help to alleviate manageability issues. Continue Reading
- Answer 20 Jul 2004
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- Answer 14 Aug 2003