1. Chapter 13 Microsoft DNS Server n DNS server: A Microsoft service that resolves computer names to IP addresses, such as resolving the computer name Brown to IP address 129.77.1.10, and that resolves IP addresses to computer names

2. Chapter 13 Design Note n When you install Active Directory, you must have at least one DNS server n A DNS server is also needed for an IIS server

3. Chapter 13 Installing DNS Server n Install DNS as a Windows component from the Control Panel Add/Remove Programs icon n Double-click Networking Services in the Windows Components dialog box and select Domain Name System (DNS)

4. Chapter 13 Selecting DNS Figure 13-8 Installing Microsoft DNS

5. Chapter 13 Design Tip n Assign a static IP address to DNS servers n On medium and large sized networks, configure at least two DNS servers on the same or different networks in case one fails

6. Chapter 13 Configuring DNS n Configure a forward and reverse lookup zone in the DNS server: u Forward lookup zone: A DNS server zone or table that maps computer names to IP addresses u Reverse lookup zone: A DNS server zone or table that maps IP addresses to computer names n Zones are created and managed by using the DNS tool in the Administrative Tools menu

7. Chapter 13 Viewing a Forward Lookup Zone Figure 13-9 DNS Forward lookup zone

8. Chapter 13 Creating a Reverse Lookup Zone Figure 13-10 Creating a reverse lookup zone

9. Chapter 13 SubnetsSubnets n Folders can be created in a reverse lookup zone to reflect subnets

10. Chapter 13 Reverse Lookup Zone Subnet Folders Figure 13-11 Reverse lookup zone subfolders for subnets

11. Chapter 13 Forward Lookup Zone Records n A forward lookup zone typically contains a host address (A) resource record: u Host address (A) resource record: A record in a DNS forward lookup zone that consists of a computer name correlated to an IP version 4 address

12. Chapter 13 Configuring a Host Address (A) Resource Record Figure 13-12 Creating a host address (A) resource record

13. Chapter 13 Reverse Lookup Zone Records n A reverse lookup zone typically contains a pointer (PTR) resource record: u Pointer (PTR) resource record: A record in a DNS reverse lookup zone that consists of an IP (version 4 or 6) address correlated to a computer name

14. Chapter 13 Creating a PTR record Figure 13-13 Creating a PTR record

15. Chapter 13 Troubleshooting DNS n If DNS is not working, make sure that the DNS Server and DNS Client services are started and set to start automatically

16. Chapter 13 DNS Terms n Cache only Server u u A caching only name server is a DNS Server that is not authoritative for any particular domain. Its only function is to look up names for clients and cache them.

17. Chapter 13 DNS Terms n DNS Forwarder u u DNS servers can be configured to send all recursive queries to a selected list of servers, known as forwarders. u u Forwarders are often desirable when access to remote DNS servers requires use of a slow link, such as a fast-speed internal network linked to the Internet over a relatively low-speed connection. Using forwarders in this situation can cut down on expensive traffic over the low-speed link.

18. Chapter 13 Describe how a DNS name gets resolved

19. Chapter 13 Using Microsoft WINS n Install and use Microsoft WINS to resolve NetBIOS computer names n WINS is installed as a Windows component via the Control Panel Add/Remove Programs tool u WINS is a subcomponent of the Networking Services Windows component