Ask the Experts
Ask the Experts
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How can I find a good job if I have my CCNA but now experience with Cisco routers?
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How are the CCNA test lab questions graded?
On the CCNA test lab questions, could using the short version of the commands make the difference between passing and failing? Or are the labs graded on the end result? Continue Reading
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Why can't I access my company's VPN?
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How do I set up a VPN to connect seven offices and the headquarters?
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What are the advantages of 10 Gigabit Ethernet?
Learn about the advantages of using 10 Gigabit Ethernet for your corporate network, in this Ask the Expert response. Continue Reading
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My firewall keeps reporting intrusion attempts described as "DCE endpoint resolution." What's going
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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
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How do I connect my managed switch to a patch panel?
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How do I measure the performance of a Linux router?
How to measure the performance of a Linux router. Continue Reading
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What is the difference between a network switch and a KVM switch?
What is the difference between a network switch and a KVM switch? Continue Reading
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If we could redesign IP to use the six byte MAC as IP addresses instead of the current 32 bit addres
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When a node connects to a network, does it send a neighbor solicitation message and router solicitat
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How can I assign fixed bandwidth to individual users/IP addresses by using CISCO 1711 router?
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How can I enable my desktop and my laptop to share files?
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How do I connect to the console and AUX port of my router?
How do I connect to the console and AUX port of my router? Continue Reading
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How can I determine how many kbps my network is operating on?
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Should I try for the CCNA certification or the CCDA certification?
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What is a network segment? Is a network segment the same as an Ethernet segment?
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How does the MAC address affect routers/switches?
Learn what MAC addresses have to do with network routers and switches from our routing and switching expert. Continue Reading
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Is there any easy way to measure EMF/EMI interactions?
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One of my computers cannot communicate with the rest of the network and I can't figure out why.
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Can you explain the concept of Quality of Service?
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How can one test VoIP functionality with their existing PBX or Key system?
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Can you explain MER Mac encapsulation routing?
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How do intrusion detection systems work?
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Can you help me put together a WLAN proposal?
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What is the difference between TCP/IP and IP protocol?
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How should I prepare for the CCNA exam?
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Is it possible to broadcast a message to all my network computers using Server 2003?
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Can CAT 6 be used to connect two switches at a distance of 550 meters?
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What type of security is associated with each level of the OSI model?
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Can you explain many-to-one address translation?
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Why do I keep losing my network connection?
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Connecting two hosts with the same IP address but different subnet masks
Is it possible to communicate two hosts with the same IP address but different subnet mask without adding a router? Continue Reading
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Settings for RTS Threshold and Fragmentation Threshold
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OSI model: List of some attacks
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We have multiple users accessing the same Outlook e-mail account simultaneously. Often, the performa
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What is the difference between symmetric and asymmetric bandwidth?
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What are the elements of creating a wireless connection between two buildings?
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How can I get a better understanding of routing and switching and all the Layer 3 protocols?
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How do I connect two wired LAN networks with a wireless link?
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What is the difference between a logical network design and a physical network design?
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I cannot establish a VPN connection the error I get is 'failure by initializing of IPsec link.' Can
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How can I reduce the number of broadcasts on my network?
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Is there any downside to PoE?
Is there any downside to PoE? Continue Reading
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Are there any inherent security problems with UDP?
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What is the maximum number of routers that can be recorded in an IP datagram if the timestamp option
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What's the difference between packet sniffers and protocol analyzers?
Learn the difference between packet sniffers and protocol analyzers in this Ask the Expert response with our networking fundamentals expert. Continue Reading
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How do I block DHCP requests and replies from different segments of my network?
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What are the main challenges facing DNS management today?
What are the main challenges facing DNS management today? Continue Reading
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How is the DNS market evolving to meet today's challenges?
How is the DNS market evolving to meet today's challenges? Continue Reading
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Can you please explain how a DHCP server allocates IP addresses dynamically?
Learn how DHCP works in this Ask the Expert response from our networking fundamentals expert, Chris Partsenidis. Continue Reading
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How do I connect our seven offices to a VPN using DSL lines?
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Where to connect a switch -- Patch panel versus ports around the office
Is it possible to connect my switch directly to my patch panel rather than connecting the switch to the various ports around my office? Continue Reading
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The difference between an access point and a bridge
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Do multiple APs on the same channel cause wireless cards to jump between them?
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Why does my server automatically shutdown?
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What's the difference between WPA and 802.11i?
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When I use the Microsoft Windows VPN Client, what kind of VPN tunnel is created?
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How do I block a MAC address?
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Is VPN from wireless or WPA/WEP more secure?
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Which networking courses, such as MCSE, CCNA, etc., are best to learn the basics?
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Could you explain the characteristics and principles of operation of a Layer 3 switch?
Layer 3 switch principles and operation are covered. Continue Reading
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How can I connect to my VPN to access Outlook and stay away from Webmail?
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What is involved in a network audit?
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OSI layers are layers of server software or server hardware?
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Why do we get CAT6 Return Loss failures when the cable is installed in floor boxes that show signs o
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When a user is unable to access certain Web pages, what is the first thing I should do to try to loc
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What are the minimum and maximum sizes of an ICMP packet?
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Why is it useful to use both a physical and a logical network design?
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Network development planning
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Which Layer 2 switching functions increase available bandwidth?
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What is the difference between an error and a bug?
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TCP/IP headers
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How can we increase our VPN connection speed?
We recently purchased a new software R&D system to allow our offices in New Jersey and Canada to link up. In order to secure the data we setup VPN's for every computer connecting to the server at the main office. Everyone who connects using a VPN ... Continue Reading
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What is maximum distance to a hub or any device and what are the maximum PCs for a network?
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When should I use 802.11a versus 802.11g?
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Are IP NAT Traversal and VPN Passthrough the same thing?
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What are the top 10 VPN clients in use today?
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Can I use CAT5e instead of plain CAT5? Are they interchangeable?
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Access Point coverage maps
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How much do the CCIE exams cost?1
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I have a Cisco router and I want to monitor my bandwidth. Do you know of any software that gives you
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Are there are any VPN clients for Mac OS X that support L2TP?
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What is the difference between an IPsec tunnel and a normal tunnel, and what is the bandwidth of eac
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How do I control Internet bandwidth per IP on my LAN?
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802.5 Ethernet vs. 802.3 Token Ring
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What layer of the OSI model does a hub operate at?
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How can I see who is using the most of our Internet bandwidth over our LAN?
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What is 'layered architecture' in computer networks?
View these links to get an understanding of what layered architecture is in computer networks. Continue Reading
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What are the characteristic of HDLC protocol?
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How long is a bit?
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Is it possible to determine the NIC speed of a remote workstation on my LAN?
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Ethernet throughput
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Is there a way to stop the Microsoft DHCP server from handing out an IP address to unauthorized mach
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Could you compare SONET versus Frame Relay with ATM networks.
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Can features such as VPN pass-through on routers be abused to dump traffic onto a NAT'd LAN?
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When one reads about the "edge" or the "border" of a network, what does it mean?
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If I connect two 5-port switches, do I end up with the same throughput as an 8-port switch?
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How do the clients in a WLAN communicate with the AP (Access Point) based on IP in the Network Layer