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You administer a network that consists of a number of subnets. For historical reasons, different subnets contain different types of operating systems. Some subnets contain UNIX servers, some contain Novell NetWare servers, and some contain Windows NT 4 servers. There are also UNIX, NetWare, Windows 95, Windows 98, NT 4 Workstation, Windows 2000 Professional, and Windows XP Professional clients. All PCs have static IP configurations. You set up an Active Directory domain with Windows Server 2003 domain controllers. You implement DHCP and configure all workstations that can do so to obtain their IP configurations automatically. You set exclusions in the DHCP scopes for clients that require static configuration. You configure Active Directory integrated DNS zones. You configure DHCP to update DNS records for all DHCP clients. You configure DNS to allow only secure dynamic updates. Legacy Berkeley Internet Name Domain (BIND) UNIX servers are configured as secondary servers for the Active Directory integrated DNS primary zone. Client workstations do not require access to each other, but all clients need to be able to access all severs by host name. You find that certain servers cannot be accessed by host name. What should you do A. Install WINS. B. Create Hosts file entries on all clients for all the servers that cannot currently be accessed by host name.

Does the code avoid magic numbers Does the code anticipate divide-by-zero errors Are type conversions obvious If variables with two different types are used in the same expression, will the expression be evaluated as you intend it to be Does the code avoid mixed-type comparisons Does the program compile with no warnings

9

Objective 2.2: Manage DNS 14-21

C. Manually enter host (A) resource records for the NetWare, UNIX, and Windows NT 4 servers. D. Install NetBEUI on all client PCs.

Do expressions that use integer division work the way they re meant to Do integer expressions avoid integer-overflow problems

You want to clear the DNS cache on a DNS server. How can you perform this task (Choose all that apply.) A. Use the Ipconfig /displaydns command-line utility while logged on to the DNS server. B. Open the DNS console and select the appropriate server. From the Action menu, select Clear Cache. C. Use the Ipconfig /flushdns command-line utility while logged on to the DNS server. D. Open the DNS console and select the appropriate server. From the Action menu, select Scavenge Stale Resource Records.

9. On the Certificate Issued page, click Install This Certificate. 10. A message informs you that a new certificate has been successfully installed.

For security reasons, you want to configure DNS server DNS2 so that it does not forward name requests that it cannot resolve from its own zone file. You log on to DNS2 as the local administrator. What should you do to achieve the desired result (Choose all that apply.) A. In the DNS console, access the DNS2 server properties dialog box. On the Advanced tab, select the Disable Recursion check box. Click OK. B. At a command prompt, run Dnscmd . /config /norecursion. C. At a command prompt, type Dnscmd . /config /norecursion 1. D. At a command prompt, run Dnscmd DNS2 /config /norecursion 1.

Does the code avoid additions and subtractions on numbers with greatly different magnitudes Does the code systematically prevent rounding errors Does the code avoid comparing floating-point numbers for equality

10.

Trey Research is a dynamic organization in an environment where rapid change is the norm. New servers are added frequently, and the names of existing resource servers are often changed to reflect new organizational structures. Active Directory integrated DNS is hosted on all of the company s Windows Server 2003 domain controllers. There is a single forward lookup zone and a corresponding reverse lookup zone. Reverse DNS lookup is heavily used to support the security of the company s e-mail system. Users report that sometimes name resolution fails, and they are told that a server is unavailable. At other times, they are directed to the wrong server. What can you do to improve the situation A. Open the DNS console. In the properties dialog box for each zone, access the Start Of Authority (SOA) tab and specify a new minimum default TTL. B. Open the DNS console. On the General tab of the properties dialog box for each zone, click the Aging button. Select the Scavenge Stale Resource Records check box.

Does the code avoid magic characters and strings Are references to strings free of off-by-one errors Does C code treat string pointers and character arrays differently Does C code follow the convention of declaring strings to be length constant+1 Does C code use arrays of characters rather than pointers, when appropriate

Now we need to take the certificate we just obtained and export it for use in Active Directory. This requires going through a conversion process in the Microsoft Management Console (MMC) Certificate snap-in.

14-22

Does C code initialize strings to NULLs to avoid endless strings Does C code use strncpy() rather than strcpy() And strncat() and strncmp()

Implementing, Managing, and Maintaining Name Resolution (2.0)

C. Open the DNS console. In the properties dialog box for each server, access the Start Of Authority (SOA) tab, and specify a new minimum default TTL. D. Open the DNS console. For each server, from the Action menu select Set Aging/ Scavenging For All Zones. Select the Scavenge Stale Resource Records check box.