发信人: songfongling(rrdn)
整理人: reynolds(2002-07-25 15:18:39), 站内信件
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[ Q 23 ] You are upgrading your Windows NT 4.0 PDC to a Windows 2000 domain controller. During the upgrade process, you choose not to install the Windows 2000 DNS Server on that computer. However, the installation fails. What caused the installation to fail when you decided not to install the Windows 2000 DNS Server?
A. All Windows 2000 domain controllers must have a DNS server installed on them.
B. There must be a Windows 2000 DNS Server somewhere on the network in order to install the Active Directory.
C. No DNS server on the network supports SRV records.
D. You cannot upgrade Windows NT 4.0 PDC to Windows 2000 Domain Controllers.
ANSWER:
C: You must have a DNS server online that supports SRV records.
A is incorrect because you do not need to install DNS on a domain controller. B is incorrect because you do not have to have a Windows 2000 DNS on the network to install the Active Directory. D is incorrect because you can upgrade Windows NT 4.0 PDCs to Windows 2000 domain controllers.
You have configured your client PCs by setting the TCP/IP properties for the LAN connection as shown in the following screen.
However, users report that they cannot resolve DNS queries. You run ipconfig on a client PC. The result is shown here.
What is the most likely explanation for users not being able to resolve DNS queries?
A. The DHCP server is off-line
B. DNS server scope options have not been set on the DHCP server
C. The DNS server is off-line
D. The default gateway has not been set
ANSWER:
B: The ipconfig output shows that the IP address for the DNS server is 0.0.0.0. This means that it has not been configured. The most likely reason from the answers given is that the DNS options have not been set for the appropriate scope on the DHCP server. DHCP scope options allow many more TCP/IP parameters to be set than just the IP address.
A is incorrect because the ipconfig output shows that the client has a configured IP address. C is incorrect because an IP address for the DNS server has not been configured, so there is no evidence to say that the DNS server is off-line. D is incorrect because the fact that the DNS server IP address is not configured is the more likely reason. The fact that the default gateway is not configured may be a problem but this would depend on whether the DNS server was located on a remote network.
[ Q 25 ] You have a network that consists of Windows 98, Windows NT, and Windows 2000 clients and a Windows 2000 DNS server. You expected that all clients would dynamically update the Windows 2000 DNS server. However, you find that only the Windows 2000 clients are doing so. All clients use a Windows 2000 DHCP server to obtain their TCP/IP settings. How would you enable the Windows 98 and Windows NT clients to dynamically update the DNS server?
A. Make the Windows 98 and Windows NT computer accounts members of the DnsUpdateProxy group.
B. It is not possible for the Windows 98 and Windows NT clients' IP addresses to be dynamically added to the DNS server.
C. Reconfigure the DNS server to allow updates from down-level clients.
D. Reconfigure the DHCP server to update the DNS server on behalf of the Windows 98 and Windows NT clients.
ANSWER:
D: The Windows 2000 DHCP server can register the Host (A) and Pointer (PTR) records with a DNS server for clients that do not support dynamic updates.
A is incorrect because the DnsUpdateProxy Group is not used for this reason. The DnsProxyUpdate group is used to loosen security on dynamic updates so that DHCP Servers that do not own records can update an existing record. B is incorrect because it is possible to allow dynamically update the DNS server. C is incorrect because there is no such option in the DNS server.
[ Q 26 ] Current Situation: You have a large network of workstations spread over five subnets. The routers do not forward any broadcast packets. At the moment, you and your colleagues allocate and configure IP addresses manually on each machine. To reduce the amount of time spent on administration you have decided to implement a DHCP server.
Required Result: IP addresses should be allocated automatically to all workstations.
Optional Desired Result: Fault tolerance should be included in the solution so that in the event of failure of any one DHCP server IP addresses will continue to be allocated
Proposed Solution: Install five DHCP servers; one on each subnet. Configure an appropriate scope on each DHCP server for the local subnet. Configure each workstation to obtain an address automatically.
Which of the following results will the proposed solution produce?
A. The proposed solution produces the required result and produces the optional result.
B. The proposed solution does not produce the required result but produces the optional result.
C. The proposed solution produces the required result but not the optional result.
D. The proposed solution does not produce the required result or the optional result.
ANSWER:
C: Setting the client workstations to obtain an address automatically, and installing a DHCP server on each subnet will meet the required result. To implement fault tolerance, each DHCP server should also be configured with a small scope of addresses for each of the other subnets. By creating distributed scopes, you allow for fault tolerance of your DHCP Server solution. Furthermore, because the routers do not forward broadcast packets DHCP relay agents would also have to be installed on each subnet.
A, B and D are incorrect because the proposed solution produces the required result but not the optional desired result.
[ Q 27 ] Your network uses DHCP to allocate IP addresses. However, you want some of your servers to always have the same address, but still allocated by the DHCP server. How would you do this?
A. Add reservations for each server
B. Exclude the server IP addresses from the scope
C. Create a separate scope for servers
D. Use the built-in User Class Option "Reversed Server" Class
ANSWER:
A: Reservations are used to ensure that a DHCP client always gets the same address. To add a reservation it is necessary to include the client's MAC address as well as the IP address to be allocated.
B is incorrect because this would not allocate an IP address automatically. Addresses that have been allocated to clients statically would be part of an exclusion range. C is incorrect because a separate scope would not always allocate the same IP address to a server, it could vary. D is incorrect because there is no User Class Option called "Reverse Server".
[ Q 28 ] You have a single-domain Windows 2000 network with two subnets and 500 workstations. You have two DHCP servers, one running on a Windows 2000 member server and one running on an Windows NT 4.0 member server. However, the Windows 2000 DHCP server does not seem to be allocating addresses. Why might this be?
A. The workstations have not been configured to use the Windows 2000 DHCP server.
B. The Windows 2000 DHCP server has address scopes that conflict with the
Windows NT 4.0 DHCP server.
C. It is not possible to have more than one DHCP server in a domain.
D. The Windows 2000 DHCP server is not authorized within Active Directory.
ANSWER:
D: In a Windows 2000 domain a DHCP server has to be authorized in Active Directory before the DHCP Server service is successfully initialized.
A is incorrect because workstations are not configured to use a particular DHCP server. The setting is simply to automatically obtain an IP address. The process is done using broadcast packets. B is incorrect because this is not a reason why a server would not allocate IP addresses. In fact it is possible for DHCP servers with overlapping address scopes to issue duplicate addresses. C is incorrect because there are no limits to the number of DHCP servers in a domain or a subnet.
One of your users reports that he cannot communicate with any PCs on the local network. You run IPCONFIG to check the TCP/IP settings. The following screen shows the output of the IPCONFIG command. What is the most likely reason that your user cannot communicate with other PCs?
A. The DHCP Server scope has been configured with the wrong IP addresses.
B. The IP address has been configured statically and incorrectly.
C. The IP address has been configured using an Automatic Private IP address.
D. The default gateway has not been configured.
ANSWER:
C: The IP address is shown as 169.254.51.209. This is an address from the Automatic Private IP address range. An address from this range is used when a DHCP client has been configured to use DHCP, but a DHCP server did not respond. The client will only be able to communicate with other PCs that also have an address allocated in the same way.
A is incorrect because the client has not received an address from a DHCP server. B is incorrect because the line "DHCP Enabled" in the IPCONFIG output shows that the IP address has not been configured statically. D is incorrect because the default gateway is only relevant for communication with PCs on remote networks and not the local network.
Current Situation: Your network consists of Windows 98, Windows NT 4.0 and Windows 2000 PCs on several subnets. You currently configure the IP addresses for all PCs manually. You also have to manually update the Windows 2000 DNS server each time a change is made to the IP address of a workstation.
Required Result: Automate the allocation of IP Addresses for all PCs
Optional Desired Results: Automate the update of DNS entries for all PCs; All PCs should be configured with the IP address of a DNS server for name resolution
Proposed Solution: Configure a DHCP server with a scope for each subnet. Configure the DHCP Server DNS properties as shown in the following screen and all clients to obtain an IP address automatically and to register their connection's address in DNS. Configure a DNS server IP address as a scope option in one of the scopes.
Which of the following results will the proposed solution produce?
A. The proposed solution produces the required result and produces both of the optional results.
B. The proposed solution produces the required result and produces only one of the optional results.
C. The proposed solution produces the required result and produces none of the optional results.
D. The proposed solution doesn't produce the required result.
ANSWER:
C: The DHCP server provides IP addresses for clients. Each client has been configured to automatically obtain an IP address. This means that it will use the DHCP server, so clients will receive an IP address automatically meeting the required result. The DHCP server has been set to "Update DNS only if DHCP client requests" and for clients to register their connection's address. This only works with Windows 2000. Windows 98 and Windows NT 4.0 DHCP clients do not support dynamic update. In order to get around this the "Enable updates for DNS clients that do not support dynamic update" option in Figure 38-2 should be set. This would ensure that the Windows 98 and Windows NT 4.0 clients IP addresses would get updated in DNS. The second optional result is not met because the DNS option should be set as a server option. There are several subnets and so there will be several scopes. Setting the DNS server IP address as a scope option would mean having to set it in all scopes.
A, B and D are incorrect because the proposed solution produces the required result and none of the optional results..
[ Q 31 ] You are getting reports of duplicate IP addresses on your network. The network consists of ten subnets and five DHCP servers and 500 workstations. Each subnet has a DHCP relay agent. Every PC is configured to user a DHCP server for TCP/IP configuration. What is the most likely reason that this is happening?
A. There aren't enough IP addresses in the DHCP scopes and therefore APIPA is being used.
B. The DHCP servers have been configured with scopes that have overlapping addresses.
C. Users are not shutting down their workstations properly.
D. There should be only one DHCP server on the network.
ANSWER:
B: The DHCP servers will have several scopes defined for the ten subnets. For fault tolerance any one subnet may have scopes on several DHCP servers. If the administrator configured scopes for a subnet on different DHCP servers that overlapped then duplicate, IP addresses will be allocated.
A is incorrect, because even if there weren't enough IP addresses and APIPA was being used the APIPA range can support over 64,000 IP addresses. C is incorrect because it is not relevant. D is incorrect because it is perfectly possible to have several DHCP servers on an internetwork as long as their address scopes did not overlap.
[ Q 32 ] Several client computers in your network are not configured to use WINS for NetBIOS name resolution. You have asked one of your colleagues to check the LMHOSTS files on these clients and update the name to IP address mapping entries. The clients are either using Windows NT 4.0 or Windows NT 3.51 operating systems. Where will your colleague find the LMHOSTS file on these client computers?
A. In the \Systemroot\System32 folder
B. In the \Systemroot\System32\Drivers\Etc folder
C. In the \Systemroot folder
D. In the \Systemroor\System32\Config folder
ANSWER:
B: In the \Systemroot\System32\Drivers\Etc folder. The LMHOSTS file is located in the \Systemroor\System32\Drivers\Etc folder of Windows NT 4.0 and 3.51 computers. This text file contains static entries for resolving NetBIOS names to their respective IP addresses.
A, C and D are incorrect because these options specify a wrong location of the LMHOSTS file.
[ Q 33 ] The network in your office has a mix of Windows 98 and Windows NT computers. You are planning to upgrade all the Windows NT servers to Windows 2000. There is also a plan to add UNIX systems. WINS is an essential part of your network configuration for NetBIOS name resolutions. You have learned that the UNIX workstations can use the WINS Proxy agent to resolve NetBIOS names to their IP addresses. Which of the following would you select to host the WINS Proxy Agent, when all the Windows NT servers are upgraded to Windows 2000?
A. Windows 2000 domain controller
B. Windows 2000 member server hosting WINS service
C.A Windows For Workgroups 3.11 computer
D. Any of above
ANSWER:
D: Any Windows based computer that is a WINS Client can be configured to be a WINS Proxy Agent. The WINS Proxy Agent will listen for NetBIOS Name Resolution Requests issued by non-WINS Clients, and forward these to its configured WINS Server. The WINS Server will reply to the WINS Proxy Agent, who in turn will return the answer to the non-WINS Client that issued the broadcast.
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