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Generator Code 128B in .NET B. Add client reservations for the clients that cannot be configured automatically.

B. Add client reservations for the clients that cannot be configured automatically.
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C. Enable address conflict resolution. D. Increase the lease duration.
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Objective 1.3: Troubleshoot TCP/IP Addressing 13-31
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Objective 1.3 Answers 1.
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Correct Answers: A A. Correct: Because no gateway exists and the new client cannot connect to any other computers on either subnet, it has likely been configured by APIPA. Because the DHCP server is on the network and the DHCP service is running, the new client probably cannot obtain a configuration through DHCP because all the addresses in the scope have been allocated. If a lease can be deleted because the computer to which it is assigned is no longer on the network, or if the size of the DHCP scope can be increased, the error will be resolved automatically in 5 minutes or less. If immediate reconfiguration is required, you can issue the Ipconfig /release and Ipconfig /renew commands on the new client. B. Incorrect: Either the router is already BOOTP-enabled or a server in Subnet A is configured as a DHCP relay agent. Otherwise, the other client computers on Subnet A would not have obtained configurations from the DHCP server. C. Incorrect: Either a server in Subnet A is already configured as a DHCP relay agent or the router is BOOTP-enabled. Otherwise, the other client computers on Subnet A would not have obtained configurations from the DHCP server. D. Incorrect: If this option were incorrectly configured, none of the clients on Subnet A would have been configured with the correct default gateway.
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Correct Answers: D A. Incorrect: The ability to access resources by server name has nothing to do with encryption. B. Incorrect: Dial-back security requires that the Remote Access Service breaks the connection once the user has been authenticated and then dials back using a predefined telephone number. This arrangement will not solve the problem of access ing servers by name, and in any case, this solution is impractical when the users are traveling salespersons who might be dialing from one of a number of loca tions. C. Incorrect: The laptops are obtaining valid IP addresses, subnet masks, and default gateways; otherwise, the salespersons could not connect to the Routing And Remote Access service and access the intranet. The problem is that the laptops cannot resolve the names of the servers on the intranet IP addresses. Although static IP configuration, including configuration of the DNS server address, would solve this problem, it is usually impractical in this situation, is error prone, and would involve a great deal of administrative effort.
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13-32
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Implementing, Managing, and Maintaining IP Addressing (1.0)
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D. Correct: The laptops are obtaining IP address, subnet mask, and default gateway configuration from the Routing And Remote Access service. They are not, however, receiving other DHCP options, such as option 006, DNS Server. As a result, they cannot access DNS to resolve server host names to IP addresses. Configuring the Routing And Remote Access service as a DHCP relay agent solves this prob lem.
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Correct Answers: A, C, and D A. Correct: The client has obtained an IP address through APIPA. This problem occurs when the DHCP server cannot provide a configuration: it is powered down, it is disconnected from the network, the DHCP service is stopped, or all IP addresses in its scope have been leased. B. Incorrect: In this case, the Ipconfig utility returns the response Media State: Cable Disconnected. C. Correct: The client has obtained an IP address through APIPA. This problem occurs when the DHCP server cannot provide a configuration: it is powered down, it is disconnected from the network, the DHCP service is stopped, or all IP addresses in its scope have been leased. D. Correct: The client has obtained an IP address through APIPA. This problem occurs when the DHCP server cannot provide a configuration: it is powered down, it is disconnected from the network, the DHCP service is stopped, or all IP addresses in its scope have been leased. E. Incorrect: If a client is set up to obtain an address automatically and its DHCP lease has expired (or it has never obtained one), it sends a DHCPDiscover broadcast to attempt to locate a DHCP server. If no server can be located, by default, it programs itself through APIPA. APIPA can be disabled, but then the PC would configure itself with the IP address of 0.0.0.0 rather than with an address from the APIPA range.
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Correct Answers: C A. Incorrect: NetBEUI cannot be installed on a computer running Microsoft Windows XP Professional. B. Incorrect: The laptop is already correctly configured with an IP address and subnet mask. Otherwise, it would not be possible to ping the other computers on the network. C. Correct: The laptop is obtaining its IP address automatically but is not obtaining the correct address for the New York DNS server. It is thus unable to obtain host name-to-IP-address resolution. This problem cannot be caused by incorrect configuration of the New York DHCP server because all your clients are operating cor rectly. The visitor s laptop must therefore be statically configured to point to the Seattle DNS server rather than to obtain the address of a DHCP server automati cally.
Objective 1.3: Troubleshoot TCP/IP Addressing 13-33
D. Incorrect: This solution would enable your visitor to access servers by host name, but it would involve excessive administrative effort.
Correct Answers: A and C A. Correct: The PathPing utility traces the route taken through the network and returns time-delay statistics for each hop. Because several routes probably exist from Los Angeles to Chicago, multiple PathPings should be sent. PathPing is not infallible because it might indicate a nonexistent delay in a fast-track router. Nev ertheless, if the same router is identified as a problem over several paths, a prob lem probably exists with that router. B. Incorrect: The Ping utility will test whether a route exists to resources.chi cago.worldtraders.corp. It will not return time-delay statistics for each hop. The f flag will prevent the ping packet from being fragmented, which is not relevant in this scenario. C. Correct: The Tracert utility traces the path through the network. It does not give as much detail as PathPing, but it is a valid method of solving the problem that is described in the scenario. The d flag speeds up Tracert operation considerably, but at the cost of not resolving IP addresses to host names. D. Incorrect: This solution displays the number of IP packets received and the number of errors detected. Although it can indicate a packet delivery problem, it does not show where in the network this problem is happening.
Correct Answers: C A. Incorrect: This solution will work, but it will use up your valuable time. B. Incorrect: This solution will work, but there s an even easier option. C. Correct: The DHCP lease has expired on some of the PCs. Because the subnet was physically disconnected from the rest of the school network, these PCs have not been able to obtain a lease and have configured themselves through APIPA. Clients configured with APIPA broadcast for a DHCP server every 5 minutes. Now that the subnet is reconnected, they will find one. D. Incorrect: Not only will this solution not solve the problem, but it will also involve unnecessary administrative effort.
Correct Answers: C and D A. Incorrect: This solution identifies and repairs inconsistencies in the DHCP database. It does not solve IP configuration problems. B. Incorrect: A client reservation ensures that a specific client always obtains the same IP address from the DHCP server. Clients that cannot obtain their addresses
13-34
Implementing, Managing, and Maintaining IP Addressing (1.0)
automatically cannot be configured through DHCP, so you needn t create reserva tions for them. C. Correct: In the DHCP console, access the server s properties, select the Advanced tab, and specify a value greater than 0 in the Conflict Detection Attempts box. Do not specify a number greater than 2 because this will adversely affect the DHCP server s performance. The most likely problem with the network described is that you have failed to locate statically configured clients and have not excluded their IP addresses from the scope. Conflict detection is not a perfect solution because the PC that is causing the problem could be powered down when the duplicate address is leased. However, enabling conflict detection reduces errors while you search for the statically configured client that you missed. D. Correct: This solution reduces the frequency with which new leases are issued and, hence, the frequency of possible conflicts with undiscovered static addresses. It will not solve the problem but will lessen its effect while you search for the stat ically configured client that you missed.
Objective 1.4: Troubleshoot DHCP 13-35
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