Ask the Experts

CCVP certification: Job market availability for unified communications

Are there opportunities in the job market for Cisco Certified Voice Professionals (CCVP)? Our certification expert explains where you can apply this voice specialty and what your salary increases to after obtaining this cert. Continue Reading
Creating a wireless bridge to connect clients distant from APs

Learn how to use one Wi-Fi module for creating a wireless bridge in order to connect clients that are distant from your access points (APs), in this expert response. Continue Reading
Can neighboring 802.11n and 802.11g networks avoid coexistence problems?

After an 802.11n migration, our wireless networking expert explains how to avoid coexistence problems with neighboring businesses that still use 802.11g. Continue Reading
What is a GRE tunnel and how does it differ from an IPsec tunnel?

Learn the difference between a GRE tunnel and IPsec tunnel in this Ask the Expert response. Continue Reading
Can 802.11n clients turn off radios to conserve battery life?

Learn about the wireless 802.11n standard's power save features that can manage your Wi-Fi clients to conserve batteries. Continue Reading

How do VPN concentrators and network access servers (NAS) differ?

Find out if there's a difference between a virtual private network (VPN) concentrator and a network access server (NAS) in this explanation from our network security expert, Puneet Mehta. Continue Reading
What keeps unauthorized users from accessing my IP address/Internet?

Our network security expert explains how to keep unauthorized users from accessing your router's IP address for Internet access in this advice explaining how proxy servers can solve client control issues. Continue Reading
Troubleshooting VLANs: How to monitor 802.1q tagged traffic

When troubleshooting a virtual LAN (VLAN), learn how to monitor 802.1q tagged traffic within a network in this advice from our routing and switching expert. Continue Reading
What is the difference between packet fragmentation in IPv4 and IPv6?

In this Q&A, our IPv6 expert explains how packet fragmentation differs in IPv6 compared to IPv4. Continue Reading
Network bandwidth calculators: What will be my WAN's link speed?

Use this recommended bandwidth calculator to calculate network latency and your WAN's link speed. Our network administration expert says this tool can simulate 1,000 users in your environment. Continue Reading
How to upgrade Windows Server 2003 to Server 2008

Use these resources recommended by our network administration expert to upgrade from Windows Server 2003 to Windows Server 2008, in this expert response. Continue Reading

Which OSI layers are network managers responsible for?

Learn which layers of the OSI model network managers should be responsible for. Our expert, Lindi Horton, explains where to focus your manual operations, especially regarding automated operation tasks. Continue Reading
What VLAN management software supports multiple vendor platforms?

Our network administration expert shows you which VLAN network management configuration and automation software supports multiple vendors and platforms, in this expert response. Continue Reading
How a TV station tower will affect your wireless network

Learn how to normalize the effects a TV station tower might have on your wireless network in this expert response explaining radio frequencies. Continue Reading
CCNA exam preparation: How to take tests faster

To prepare for your Cisco Certified Networking Administrator (CCNA) certification exam, use these time-saving techniques to speed up your test-taking so that you don't run out of time. Continue Reading