vb.net qr code library B. The DHCP server is not authorized in Active Directory. in .NET framework

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B. The DHCP server is not authorized in Active Directory.
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C. The DHCP server s computer account is not a member of the DNSUpdateProxy global security group. D. The clients are not configured to update their own host A resource records.
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Implementing, Managing, and Maintaining IP Addressing (1.0)
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Your Microsoft Windows Server 2003 DHCP server is on Subnet A (10.0.10.0/25), as are two Microsoft Windows Server 2003 domain controllers DC1 and DC2, and various resource servers. The same subnet also contains XP Professional clients. Subnet B (10.0.10.128/25) is connected to Subnet A by a server running the Microsoft Windows Server 2003 Routing And Remote Access service configured as a router. DHCP Relay Agent is set up correctly to point to the DHCP server address. Subnet B contains only XP Professional clients. DNS is Active Directory integrated and DHCP option 006 is configured to point to DC1. Option 003 is set at scope level so that the clients on each subnet obtain the correct default gateway addresses. Two clients, Client003 and Client016, on Subnet A have DHCP reservations. Because they access the servers frequently by host name, client option 006 on Client003 s res ervation specifies DC2, whereas Client016 is configured with a static DNS server address, which is also the address of DC2. Clients on Subnet B report logon delays. To solve this problem, you move DC2 to Subnet 2 and reconfigure its IP address and default gateway. You ensure that DC2 specifies itself as its own primary DNS server, and you amend Client016 s configuration so that the new IP address of DC2 is set as Client016 s DNS server address. On Client003, you run the command-line utility Ipconfig /flushdns. You set scope option 006 for the Subnet B scope to point to the new address of DC2. What are the effects of these changes (Choose all that apply.) A. All clients on Subnet B access DC2 the next time they require name resolution. B. All clients on Subnet A access DC1 for name resolution. C. Client016 can ping Client003 by host name. D. Client003 can ping Client016 by host name.
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Objective 1.4: Troubleshoot DHCP 13-43
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Objective 1.4 Answers 1.
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Correct Answers: B A. Incorrect: Scope option 003 specifies the default gateway. You can specify the same default gateway for two separate scopes on two separate servers. B. Correct: Two DHCP servers cannot provide the same IP address on the same subnet. Otherwise, two PCs on that subnet could be configured with the same IP address. The second DHCP server identifies the overlap and classifies itself as a rogue server. It will therefore not be authorized in Active Directory. Failover pro tection for DHCP is provided by clustering or by configuring DHCP servers (usu ally on different subnets) with nonoverlapping scopes. C. Incorrect: A superscope is not required in this situation. Also, a superscope cannot contain overlapping scopes. D. Incorrect: Scope option 006 specifies the DNS server address. You can specify the same DNS server address for two separate scopes on two separate servers.
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Correct Answers: D A. Incorrect: UDP port 67 passes DHCP broadcast traffic. B. Incorrect: Jetpack is a Microsoft Windows Server 2003 utility that is used to manage database files such as the WINS and DHCP databases. The DHCP audit log does not indicate any database problems. C. Incorrect: Because the clients cannot obtain leases, releasing and renewing the leases on the clients will have no effect. D. Correct: New DHCP servers in a Microsoft Windows Server 2003 domain need to be authorized in Active Directory. This process ensures that rogue servers with scopes that overlap other DHCP servers in the domain will not be able to issue leases. The DHCP audit log indicates that this DHCP server has not been autho rized.
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Correct Answers: A and D A. Correct: Reservations have been set up correctly for senior managers PCs, all of which are in the main office and therefore on the same subnet as your PC. As a result, senior managers PCs will retain the IP addresses with which they are cur rently configured and will be able to access the Internet. B. Incorrect: The reservation has not been set up correctly for the branch man ager s PC. Because the branch manager s PC is on another subnet, the MAC address you obtained from your ARP cache will be the address of the default gateway on the main office subnet. The branch manager s PC could therefore be con-
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Implementing, Managing, and Maintaining IP Addressing (1.0)
figured with an IP address other than the one with which it is currently configured. If no leases are available, then the branch manager s PC will be configured through APIPA and will not be able to access the Internet. C. Incorrect: The senior managers have reservations and will be able to obtain their reserved leases even when the available leases for nonreserved clients have all been allocated. However, the branch manager does not have a valid reservation and cannot obtain a lease if all leases in the branch office scope have been allo cated. D. Correct: You have not configured any client options for the reservations. Therefore, by default the reserved clients will be configured using the scope options, which have not been changed.
Correct Answers: C A. Incorrect: You can use the DHCP Administration Tool (or DHCP console) to rec oncile the DHCP database, either for a single scope or for all scopes on a server. This tool identifies and repairs any inconsistencies. However, the errors recorded do not indicate unreconciled IP addresses, but rather buffer allocation or database identity problems. B. Incorrect: Netdiag is a Microsoft Windows Server 2003 Support Tool. It can check a host computer s network configuration and fix simple DNS problems. It cannot, however, diagnose and repair DHCP database problems. C. Correct: You can use the Jetpack utility to manage the DHCP database and iden tify problems. The error codes listed indicate the following: 1010: Invalid database ID 1014: Out of database page buffers 1016: Too many columns in an index However, the fact that the errors are occurring regularly might indicate that the problem is related to the periodic automatic backup of the DHCP database. Jetpack can indicate the source of the errors. D. Incorrect: This problem is a DHCP database issue that is internal to the DHCP server. Monitoring network traffic to and from the server will not detect the error.
Correct Answers: B, C, F, and G A. Incorrect: DHCP settings for managing dynamic DNS records are on the DNS tab. B. Correct: DHCP settings for managing dynamic DNS records are on the DNS tab.
Objective 1.4: Troubleshoot DHCP 13-45
C. Correct: Selecting this check box enables DHCP to update the resource records of clients that are capable of sending DHCP option 81 to the DNS server that is Microsoft Windows XP Professional and Microsoft Windows 2000 Professional cli ents as requested by the client. This results in the DHCP service updating the cli ent s PTR record and the client updating its own host A record. This check box is selected by default. D. Incorrect: If this check box is cleared, DHCP will not supply dynamic update information, and the DHCP client attempts to update host and PTR resource records itself. The check box is selected by default. E. Incorrect: Selecting this option causes the DHCP server to update both host and PTR resource records. This behavior is not the default, nor is it required by the question scenario. The option is cleared by default. F. Correct: If this option is selected, DHCP will discard a client s host A record when the client s DHCP lease expires. This option is selected by default in Microsoft Windows 2003 DHCP. G. Correct: By default, the entity that updates a record also deletes it when the lease expires. Because the DHCP server does not create host resource records for Microsoft Windows 2000 Professional and Microsoft Windows XP Professional cli ents by default, it will not delete them unless you select this check box. The check box is cleared by default. H. Incorrect: This enables DHCP to update the records of clients that cannot update their own resource records in DNS. This check box is cleared by default. Selecting this check box is not necessary in this scenario, and the question requires that only options relevant to your requirements should be specified.
Correct Answers: A and D A. Correct: You can use the DHCP Administration Tool (or DHCP console) to rec oncile the DHCP database, either for a single scope or for all scopes on a server. In this case, right-click the appropriate scope, click Reconcile, and click Verify. If the database is inconsistent, select the displayed addresses that need to be recon ciled and click Reconcile. B. Incorrect: Netdiag is a Microsoft Windows Server 2003 Support Tool. It can check a host computer s network configuration and fix simple DNS problems. It cannot, however, reconcile a DHCP database. C. Incorrect: The Nbtstat command-line utility displays NetBIOS statistics. It cannot reconcile a DHCP database. D. Correct: When set to the proper DHCP scope, the Network shell command Ini tiate Reconcile checks and reconciles the database for the scope specified.
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Implementing, Managing, and Maintaining IP Addressing (1.0)
Correct Answers: D A. Incorrect: DHCP Relay Agent should be installed either on a router or on a server on a subnet that contains client PCs but no DHCP server. It should not be installed on a DHCP server. B. Incorrect: Microsoft Windows Server 2003 DHCP can issue leases to any client that can be set up to obtain its IP configuration automatically. This includes (among others) all the clients on Subnet B. C. Incorrect: The DHCP server has been authorized in Active Directory and is issu ing valid leases to clients on Subnet A. It is not, therefore, a rogue server. D. Correct: Subnet B is not receiving DHCP leases. As a result, the Microsoft Windows 2000 and Microsoft Windows XP clients are configuring themselves with APIPA addresses while the Microsoft Windows 98 and Microsoft Windows NT 4 clients are configuring themselves with IP address 0.0.0.0. The most likely reason is that DHCP Relay Agent is not configured with the correct address of the DHCP server. In the Routing And Remote Access console on the router, right-click DHCP Relay Agent and click Properties. The IP address of the DHCP server should be specified on the General tab. If it is not, enter the correct address in the Server Address text box and click Add.
Correct Answers: C A. Incorrect: Both Active Directory integrated zones and standard primary DNS zones on Microsoft Windows Server 2003 computers can be configured to update their records dynamically. B. Incorrect: A DHCP server on an Active Directory domain must be authorized in Active Directory before it can issue leases. In this scenario, the DHCP server has issued leases and must therefore be authorized. C. Correct: By default, the computer that updates a DNS record owns that record, and no other computer can update it. Because the DHCP server has been updating host A resource records, it owns these records. This problem was not apparent when the DHCP server was updating both A and PTR resource records, but now it has been reconfigured to allow clients to update their own host resource records. The clients cannot perform this task because the DHCP server owns the records. The DNSUpdateProxy group was created to solve this problem. Members of this group can update resource records but do not own them. The DHCP server would have become a member of this group automatically when it was config ured to issue host resource records, but for some reason, it has been removed. You can reconfigure the DHCP server to update both host and PTR resource records, but a better solution is to add the server to the DNSUpdateProxy group,
Objective 1.4: Troubleshoot DHCP 13-47
manually delete the clients host records, and then either reboot the clients or use the Ipconfig /registerdns command-line utility on each client. D. Incorrect: By default, Microsoft Windows XP Professional clients are configured to update their own host resource records. Although this default could have been changed on a single client, it has probably not been changed on all of them.
Correct Answers: B and C A. Incorrect: Clients on Subnet B retain their current leases and access DC1 for name resolution as before. Only when they obtain new leases will they access DC2. If you wanted them all to access DC2 the next time they required name res olution, you should have released and renewed their leases from the command line. B. Correct: Scope option 006 is not set for the Subnet A scope, which continues to apply server option 006 as before. C. Correct: Client016 has been statically configured to access the new IP address of DC2 for name resolution. Client003 s host name will therefore be resolved to the correct IP address. D. Incorrect: You haven t changed Client003 s client option 006, nor have you released and renewed the lease. Client003 therefore attempts to use the old address of DC2 to access a DNS server. Client003 might have been able to ping Client016 if Client016 s IP address and host name were cached because of a pre vious ping, but you cleared Client003 s DNS cache. Client003 would be able to ping Client016 if the Ipconfig /renew command had been executed instead.
14 Implementing, Managing, and Maintaining Name Resolution (2.0)
The Domain Name System (DNS) is a service that resolves (or translates) host names into IP addresses. The host names can be local such as ServerA, or remote Fully Qualified Domain Names (FQDNs) such as www.fabrican.com. Local names are typically (but not necessarily) resolved to private IP addresses such as 10.10.16.5. Remote FQDNs are resolved to registered IP addresses such as 206.73.118.10. The significance of this last statement cannot be overemphasized. Any Web-based resource can be resolved to a registered IP address across the Internet. Resources inter nal to a large corporation, but not local to the resolver, can also be found by iterative queries across a large organization. You can sit at your PC and access resources on the other side of the world, and you don t need to know the IP addresses, or even the physical locations. The ubiquity of DNS makes it a security hazard for organizations that want to access Internet resources and want to make their presence known on the Internet, but need to protect their internal resources. DNS has come a long way from the 1980s, with more and more sophisticated tools becoming available to set up more and more complicated structures to manage DNS. One of the key tasks of the network administrator is to make access as easy as possible for the people who need to access resources and as difficult as possible for the others. In its initial form, DNS was a static and uninspiring service consisting of some merged hosts files, and what was then known as the DNS cache (now root hints) that con tained the IP addresses of a few top-level (root) servers in the DNS hierarchical structure. DNS is now dynamic, with clients registering their own resource records including reverse lookup (PTR) resource records. The number of record types has increased beyond recognition from the simple host (A) resource records through AAAA (QuadA) IPv6 records, start-of-authority (SOA) resource records, and SRV (service) resource records. Any Microsoft Network Infrastructure examination will focus heavily on DNS, and this book is no exception. You need to become familiar with components, concepts, and practices of using DNS in a Microsoft Windows Server 2003 environment. You need to know when it is appropriate to configure a DNS zone as Active Directory integrated primary, standard primary, secondary, or stub. You should be familiar with the difference between a forward and a reverse lookup zone. You should be aware of the functions of secondary servers, caching-only servers, stub servers, and forwarders, and when it is appropriate to use each of them. You need to know how to
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Implementing, Managing, and Maintaining Name Resolution (2.0)
allow dynamic updates, how to allow only secure dynamic updates, and when to use each of these functions. You should know how to disable recursion, and be familiar with resource record aging and the scavenging process. DNS works closely with the Dynamic Host Configuration Protocol (DHCP). The settings in the relevant DNS and DHCP properties dialog boxes look comparatively sim ple, but they combine in complex ways. You need to be able to configure settings that give the maximum possible support for dynamic updates of resource records for hosts with such legacy operating systems as Microsoft Windows 95, Microsoft Windows 98, and Microsoft NT 4, and such non-Microsoft operating systems as NetWare and UNIX, while still maintaining the security and integrity of your network.
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