1. Lecturer : Ms.Trần Thị Ngọc Hoa Chapter 2 Methods Configuring Name Resolution Methods

2. Lecturer : Ms.Trần Thị Ngọc Hoa Objectives  Understanding Name Resolution in Windows Server 2008 Networks  DNS Name Resolution  Configuring DNS Client Settings  Creating and Configuring Zones

3. Lecturer : Ms.Trần Thị Ngọc Hoa Name Resolution in Windows 2k8  Why is name resolution ?  Three name resolution services DNS – Domain Name Service Link Local Multicast Name Resolution – LLMNR NETBIOS – Network Basic Input Output System

4. Lecturer : Ms.Trần Thị Ngọc Hoa DNS Name Resolution  DNS Name Space  Internet Corporation for Assigned Names and Numbers (ICANN)  Three types of top-level domains exist: Organizational domains Geographical domains Reverse domains

5. Lecturer : Ms.Trần Thị Ngọc Hoa Domain Names - FQDN  www.howstuffworks.com - a typical name  www.yahoo.com - the world's best-known name  www.mit.edu - a popular EDU name  encarta.msn.com - a Web server that does not start with www  www.bbc.co.uk - a name using four parts rather than three  ftp.microsoft.com - an FTP server rather than a Web serverFTP

6. Lecturer : Ms.Trần Thị Ngọc Hoa DNS Structure 1. DNS servers Contains database information about some portion of the DNS domain tree structure Resolve name resolution queries issued by DNS clients A server is authoritative for a domain when that server relies on locally hosted database data 2. DNS zones a contiguous domain name for which a server is authoritative Forward lookup zones Reverse lookup zones

7. Lecturer : Ms.Trần Thị Ngọc Hoa DNS Structure (cont) 3. DNS resolvers  Service  Query for information from DNS servers 4. Resource records  DNS database entries that are used to answer DNS client queries  Example :  A  A : IPv4 host address  AAAA  AAAA : IPv6 host address

8. Lecturer : Ms.Trần Thị Ngọc Hoa Understanding Server Types  Primary servers :  Host primary zone  Central point of update  Newly created zones are this type  Two ways of deployment Standard : Single point of failure Active Directory integrated :  Zone data is stored and replicated in Active Directory  Fault tolerance Domain controller is also the primary DNS server in the domain

9. Lecturer : Ms.Trần Thị Ngọc Hoa Understanding Server Types (cont)  Secondary servers : Host secondary zone Load sharing and backup solution  Stub servers : Host stub zone Enable a parent zone to keep an updated list of the name servers available in a child zone  Caching only servers : Do not host any zones Queries caching Minimize name resolution traffic across WAN links

10. Lecturer : Ms.Trần Thị Ngọc Hoa Understanding Recursion and Iteration  Recursion refers to the process of a DNS server querying other DNS servers on behalf of an original querying client  Iteration refers to the process of a DNS client making repeated queries to different DNS servers.  Using root hint referrals from the DNS server  WINDOWS\System32\Dn\Cache.dns

11. Lecturer : Ms.Trần Thị Ngọc Hoa Lab Demo server.cse.hui.edu.vn 192.168.1.254 clnt2.cse.hui.edu.vn 192.168.1.2 clnt1.cse.hui.edu.vn 192.168.1.1