Ask the Experts
Ask the Experts
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What is the difference between a network analyzer and a protocol analyzer?
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What causes a TCP SYN-attack?
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Is it possible to connect to a wireless hotspot without getting an IP address?
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Can a router be configured to automatically connect to the Internet even when the server is off?
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I just purchased a Cisco 2611 router and I'd like to know if it's possible to configure FE1 as a DHC
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Why do we need the MAC address if all Ethernet connections are done via IP address?
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What are the antenna specifications for the 802.11a ,b and g standards?
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What do I need to do to achieve the CCAI?
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Which area of expertise has better job prospects, routing and switching or voice?
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Should I take the CCNA before the CCDA?
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Can I break into the networking field with no experience, just certs?
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What will be the biggest impact of IPv6?
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What tools are available to identify IP addresses on my LAN?
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What is difference between a WINS server and a DNS server?
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Can I have two Internet connections -- one the VPN and one not?
Is it possible to have two connections to the internet running simultaneously, one running a VPN and one not? If so, how do you determine which connection a given user session will use? I am running XP. Continue Reading
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Establishing communication between two networks via switches
I have two 3Com layer 3 switches (4924) connecting to two separate networks in a building. How do I configure these switches so that the communication can be established between the two networks?
These two networks are on the first and second ... Continue Reading
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How do I open port 177 on my router so that other clients can get a GUI display of my server remotel
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Is it true that I may encounter contention issues if I uplink a Gigabit switch to a fast Ethernet sw
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What are some key points to consider when hiring an outside firm to handle an organization's network
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User acceptance test plan for 1000-branch WAN
My vendor has asked me to prepare a user acceptance test plan for a WAN of 1000 branches, which have leased line and ISDN connectivity. What are the specific parameters I should look for at each branch connection? The vendor has just specified ping ... Continue Reading
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What is ping?
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What are intusion detection and intrusion prevention and how do they work?
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What are the system requirements for connecting elevators in a high-rise building via a wireless net
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What's the difference between a network assessment and an audit?
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Why can't I print on my wireless network?
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Can I assume that since I passed the CCNA, I am also ready for Network+ certification?
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How do I set up two or more wireless adapters on the same computer to work together?
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What certification better compliments the MCSE: CCNA or RHCE?
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How can I share my Internet connection between two routers?
I want to connect two routers to my Internet connection. The first is a VPN connection consisting of a Cisco 501 switch and an Aironet 1200 wireless router that uses a static address for the connection and connects to a work server where it is ... Continue Reading
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How do you get five switches to talk without using a routing protocol?
I want to add five catalyst 3550 IOS switches to a single 4506 Cisco router so that each switch will have its own subnet. 192.168.10.0, 192.168.11.0, etc.. how do you get all five switches to talk without using an routing protocol like OSPF or RIP ... Continue Reading
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Why can I connect to or ping some computers via my Cisco VPN connection but not others?
Why can I connect to or ping some computers via my Cisco VPN connection but not others? I use Remote Desktop Connection to connect to various computers on our corporate network (Windows XP PRO on all machines and each one has been allowed to receive... Continue Reading
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How private networks talk to each other
I have two private networks linked by VSAT link without Internet. Only the second network has Internet access permitted by an ISP router. I want to permit the other network to access the Internet through the same ISP router.
Note that the ... Continue Reading
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Why do I keep running into network traffic jams?
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How can I increase bandwidth at my Internet cafe?
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How do I remove Trojan viruses that have infected my network?
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What are some recent developments in WLAN security?
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Where are the best networking jobs for a CCNA?
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FTP get scenario
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Can you help me improve poor telnet performance?
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Catching illegal VoIP
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Which transmission media are the most secure and the least secure?
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Why can't my notebook with wireless card connect to our router?
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Placement of the firewall
In this expert response, Puneet Mehta tells us where the placement of the firewall should be architecturally. Continue Reading
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Security risks of firewalls and VPNs
What are the key security risks and considerations to adopt firewall/VPN technology? Continue Reading
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How to protect your network from broadcast and multicast storms
What methods are available to protect a network from broadcast and multicast storms? Continue Reading
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Traffic and scanning process
Please explain the traffic and scanning process. Continue Reading
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Security of each level of the OSI model
What kind of security is associated with each level of the OSI model? Continue Reading
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What line of study should I pursue to advance my career at an ISP, working with Solaris and Linux?
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Advice on making the transition from network engineering to network security
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What type of firewall is appropriate for a 200 machine workgroup?
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The future of security certifications
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Pursue CCNP or CCSP?
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Is an engineering background a must for a career in routing and switching or network security?
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Why am I experiencing poor performance when I connect to the network via my switch, but not when I c
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Why are we experiencing repeated network drop-outs?
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Can I use my wireless router to create a workgroup between desktops?
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Can you please explain the following, common Ethernet errors?
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How can I learn the dos and don'ts of Cat 6 cable installation?
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What are the advantages and disadvantages for pure IP over IP-enabled solutions?
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What are network collisions and how do they occur? Are they normal?
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In a LAN environment, which is better: Token Ring or Ethernet and why?
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What is a network sniffer?
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What is a collision domain? How does replacing a hub with a switch affect collision?
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What's the difference between a router and a layer 3 switch?
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Routers versus gateways
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What is the future of thin APs relative to wireless network security?
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Is a VPN the correct tool for connecting three computers?
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Since DNS uses UDP instead of TCP, if a packet is lost, there is no automatic recovery?
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Can I connect two networks, one wired, one wireless, so that I can access the Internet through the s
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How long after passing the CCNA do I have to take the CCSP and subsequent Cisco certs?
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How do I configure a switch port to full-duplex and another to auto-sensed from a 24-port Cisco 2950
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From a beginner's perspective, what is the best course of study to get into the network management f
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What's needed to wirelessly connect two offices 100 feet apart?
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Creating a wireless client/server environment using Windows 2000 server and Windows 2000 Pro
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How will WiMax benefit those looking to avoid commercial access fees?
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Cannot connect to Internet or local network while on the VPN
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When implementing a spyware firewall is it important to have SNMP/API and Ethernet Bypass HW?
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How can I hardening my network against Trojans?
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Initial steps to creating a small-scale WAN
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MPLS roll-outs and Active Directory
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Can you explain the importance of upgrades and patches and what the differences between the two are?
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What is your opinion of 'free' certifications such as BrainBench and ExpertRating?
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Why when I enable the proxy on my web browser, my download speed is very slow, but when it is not en
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I need help adding a central MAC address authentication server to our current WLAN.
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What is the National Vocational Qualification equivalent of the CCNP?
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Is it still possible for me to get the CCNP recertified with just the foundation test?
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What are GSM and CDMA?
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Is there a "rule of thumb" for the number of broadcast packets per second that can be tolerated befo
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How does one decide between CAT5E and CAT6? Does bandwidth play a role?
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What are the job prospects and average salary of a CCIE?
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How long do I have to finish the CCNP exams before my CCNA runs out?
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Would you consider a Microsoft VPN tunnel through a WEP encrypted access point to be secure?
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How will IPv6 impact networks in foreign countries?
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What's the best way to measure throughput for Ethernet over SDH implementations and why?
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What does the term "stackable switches" means?