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CP/IP addressing problems are like phone numbers Imagine that you have a phone number and that everybody in your circle of friends and family has it If you change your phone number, then everybody else needs to know what it is in order for them to talk to you on the phone Getting the addressing right is therefore vital to enabling everybody to talk to each other Once you understand the basics of TCP/IP addressing, finding and identifying faults should become relatively easy
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The ipconfig tool, used without any options, will give you your current IP address settings, irrespective of how they have been set:
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Ethernet adapter Local Area Connection: Connection-specific IP Address Subnet Mask Default Gateway DNS Suffix : : : : windowsmcslppri 1921681180 2552552550 19216811
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Common TCP/IP addressing problems are
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The IP address It must be within the scope of your subnet or one of your subnets, and it must be unique You will get a warning on both machines if you choose an IP address that is not unique The netmask It must match the mask for your subnet or subnets If set incorrectly, the client might not know whether a machine it s trying to talk to is on the local network or another network The gateway address IP packets that the client has determined do not fit into the current network (by using the IP address/netmask combination) are sent to this IP address for routing If set incorrectly, it can cause packets to be routed incorrectly or not to be routed at all
There are a few other tests you can do to check the configuration and stability of a client s network configuration:
Ping 127001 This is the localhost address and should always work if the TCP/IP stack is installed correctly, even if the IP address settings are not correct If this test fails, there s a fundamental issue in your TCP/IP drivers: they are not installed correctly, or they are corrupt Either way, they need to be reinstalled Ping local address This will check that the IP address for the client has been bound to the card properly Do this in combination with ipconfig to ensure that you are checking the right address If the test fails, then the network card is probably faulty Reinstall the drivers for the card or replace the card Ping default gateway This should verify the connectivity to another device on the network If it fails, check the cabling and physical connectivity to the card
CHAPTER 4 Planning, Implementing, and Maintaining a Network Infrastructure
Ping remote IP address This should verify that the routing is working correctly and should verify that both the gateway IP address and the netmask are correct If it fails (particularly with destination host unreachable ), verify the default gateway and netmask settings are correct and check the WAN for connectivity problems
Exam Tip
Make sure you know the effects of the various tests, either way It s possible you ll be asked to identify where a failure is within the configuration based on the result of a ping to one of these areas Questions on the exam in this area tend to center around the issue of getting the address/netmask/gateway correct For example, a popular question type is Your client has an IP address of 1921681180, a netmask of 2552552550, and a default gateway address of 19216821 What should you change In this case, the problem is that the default gateway is not reachable because it s on a different subnet from the client (based on the IP and netmask) Other questions will give you a network diagram with various servers and routers and ask you to determine which machines can talk to which, or determine whether a specific machine is able to talk to another For example, look at the information in Figure 418 You can ping ServerA from the other servers, and you can ping the Router0 from ServerA, but ServerA is unable to connect to the servers on network B Which setting is preventing ServerA from communicating with the outside world
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