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Other Symptoms and Causes of Network Problems
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A device in my system is not functioning and I can t connect to the network This sounds like a network card configuration error Make sure that the NIC is configured correctly Be sure to use a free IRQ and I /O address when configuring the card In addition, the driver might not have loaded correctly What has changed since this adapter worked correctly Make sure that the hub is not locked up Resetting the hub usually fixes this problem Sometimes an incorrectly configured network adapter causes it The speed of the network card is usually incorrectly set differently from other cards on the network For example, a Token Ring network can use speeds of 4 Mbps or 16 Mbps If a workstation is set to 4 Mbps and the entire network is set to 16 Mbps, the network could go down On an Ethernet network, setting a NIC to 10 Mbps on a 100 Mbps network could cause the network to lock up This problem can be caused by many things, but make sure that there is no problem with the Internet gateway, if you are using one; this gateway is a computer that acts as an intermediary between the Internet and your local intranet This problem also could be a routing issue if you are using a dedicated connection to the Internet Verify that the router or gateway is functional and try pinging key computers on remote networks and the Internet Use tracert to an Internet host to see if the problem is with your network or your Internet provider s network Make sure that you are not having a name resolution problem Did this problem just start occurring Test for connectivity by pinging the host If you can connect to the host using an IP address instead, you definitely have a name resolution problem If you can t connect with an IP address, try pinging another computer on that network Maybe you are having routing problems Someone on the network is beaconing Therefore, the nearest active upstream neighbor (NAUN) is having a problem The network cannot continue until the problem is fixed Sometimes the problem occurs because a bridge is locking up too
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12:
Troubleshooting the Network
You ve seen some examples of the most common problems you will encounter in your networking professional journey You are beginning to see that the same problems will continue to arise, but the causes and solutions could be different
Recognizing Abnormal Physical Conditions
The key to recognizing abnormal physical conditions on the network is knowing what a normal physical condition is Such a condition could be different from one network to another For example, it could take your network only three seconds to spool up a print document, but it could take another network one minute to spool up a document of the same size This doesn t mean that the second network has a problem; it could be merely a normal physical condition for that network The following are things to look for when you attempt to determine whether an abnormal condition is occurring on your network:
Printing takes longer Authentication takes longer You are receiving more errors than usual Connecting to remote resources takes longer, if you can connect at all You are losing connections to resources Network applications are not running
To determine whether these situations are abnormal occurrences on your network, you need to ask yourself a few questions:
How many users are affected by this problem Is the problem consistent Is the problem replicable Was there a recent upgrade to the network or computer Has any of the equipment been moved Have we encountered this problem before Has anyone else attempted to x the problem How many applications is this problem affecting Are there new users or computers on the network Is this a busy or congested time of day Which products are involved
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