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Module 4: Configuring a Client for Name Resolution.

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Presentation on theme: "Module 4: Configuring a Client for Name Resolution."— Presentation transcript:

1 Module 4: Configuring a Client for Name Resolution

2 Overview Resolving Client Names Managing the ARP Cache Overview of NetBIOS Using Static Name Resolution Using Dynamic Name Resolution Summarizing the Name Resolution Process

3 Lesson: Resolving Client Names The Name Resolution Process

4 Multimedia: The Name Resolution Process A DNS client can use several different methods to resolve an IP address from an FQDN DNS Server Payroll.contoso.msft Corp01.contoso.msft

5 Lesson: Managing the ARP Cache Static and Dynamic ARP Cache Entries How ARP Resolves IP Addresses to MAC Addresses Using the ARP Tool to Manage the ARP Cache

6 Static and Dynamic ARP Cache Entries An ARP cache The cache is a table of recently resolved IP addresses and their corresponding MAC addresses TCP/IP checks the ARP cache before sending an ARP request To view the cache, type arp –a at the command prompt The cache is a table of recently resolved IP addresses and their corresponding MAC addresses TCP/IP checks the ARP cache before sending an ARP request To view the cache, type arp –a at the command prompt Static cache entries:Dynamic cache entries: Have no time-out value Must be added manually Must be updated Have no time-out value Must be added manually Must be updated Have a time-out value Are removed after the specified time Have a time-out value Are removed after the specified time

7 How ARP Resolves IP Addresses to MAC Addresses ComputerA ComputerC ComputerB ARP cache is checked ARP entry is added ARP request is sent ARP reply is sent 4 4 ARP entry is added IP packet is sent

8 Using the ARP Tool to Manage the ARP Cache

9 Practice: Identifying a MAC Address In this practice, you will identify a MAC address

10 Practice: Viewing and Modifying the ARP Cache In this practice, you will view the ARP cache and then modify it

11 Lesson: Overview of NetBIOS The Types of Names Computers Use What Is NetBIOS? What Is a NetBIOS Name? What Is NetBT? Types of NetBT Nodes What Is Nbtstat?

12 The Types of Names Computers Use Name Description NetBIOS Names 16-byte address Can represent a single computer or group of computers 15 characters used for the name 16th character is used by the services that a computer offers to the network Host Names Assigned to a computers IP address 255 characters in length Can contain alphabetic and numeric characters, hyphens, and periods. Can take various forms Alias Domain name

13 What Is NetBIOS? Application Transport Internet Link TCP/IP Application Transport Network Data-Link OSI Presentation Session Physical NetBIOS Interface NetBIOS Applications NetBIOS Is an API Operates at the session and transport layers of the OSI protocol stack Establishes names, sessions and data transfer Is an API Operates at the session and transport layers of the OSI protocol stack Establishes names, sessions and data transfer

14 Payroll Payroll What Is a NetBIOS Name? Corp1 Corp1 16 byte name 16th character is a 1 byte hexadecimal identifier Used for the name of a computer or the name of a service running on the computer 16 byte name 16th character is a 1 byte hexadecimal identifier Used for the name of a computer or the name of a service running on the computer

15 NetBT Runs on top of the TCP/IP network protocol Supports discovery, registration and release of NetBIOS names Uses broadcast or a NetBIOS name server, depending on node type Runs on top of the TCP/IP network protocol Supports discovery, registration and release of NetBIOS names Uses broadcast or a NetBIOS name server, depending on node type What Is NetBT? Transport Internet Application NetBIOS Interface NetBT TCP/IP NetBIOS Applications

16 Types of NetBT Nodes NetBt Node Types B-node (broadcast)Uses NetBIOS broadcast name queries P-node (peer-to-peer)Uses NBNS M-node (mixed) A combination of B-node and P-node. Uses broadcast by default H-node (hybrid) A combination of B-node and P-node. Uses NBNS by default Microsoft enhanced B-nodeUses the Lmhosts file

17 Practice: Determining and Setting the NetBT Node Type of a Client In this practice, you will determine and then change the NetBT node type of a client computer

18 What Is Nbtstat? Use nbstat to: Check the state of current NetBT connections Update the Lmhosts cache Determine the registered name of a client Check the state of current NetBT connections Update the Lmhosts cache Determine the registered name of a client

19 Lesson: Using Static Name Resolution Using an Lmhosts File Guidelines for Configuring a Client to Use Lmhosts Using a Hosts File

20 Using an Lmhosts File What is the IP address for london ? localhost router london localhost router london Lmhosts File

21 Guidelines for Configuring a Client to Use Lmhosts Guidelines An entry consists of the IP address, one space or tab, and the NetBIOS name Entries can represent all versions of Windows Each entry must be on a separate line. Use a carriage return after the final entry NetBIOS names can contain uppercase, lowercase and special characters # marks the start of a comment or a keyword

22 Practice: Adding an Entry to the Lmhosts File In this practice, you will add an entry to the client Lmhosts file

23 Using a Hosts File What is the IP address for s1? localhost router server1.central.microsoft.com s localhost router server1.central.microsoft.com s1 Hosts File Client

24 Practice: Adding an Entry to the Hosts File In this practice, you will add an entry to the client Hosts file

25 Lesson: Using Dynamic Name Resolution What Is WINS? What Is DNS? The DNS Suffix

26 What Is WINS? Queries a WINS Server Determines if name is in use or not If not in use, then registers the NetBIOS name and associated IP address 3 3 Payroll WINS Server NetBIOS Name Registration Query OK ? ?

27 What Is DNS? Root domain Child domain Parent domain Org Com Other top-level domains Edu (. Root) Contoso printserver payroll accounts FQDN: printserver.contoso.com.

28 The DNS Suffix FQDN corp05.contoso.com. corp01.sales.contoso.com. FQDN DNS Suffix Host Name DNS Suffix Host Name corp01 = corp05 = com. Root contoso sales

29 Practice: Using Ipconfig to Manage the DNS Client Resolver Cache In this practice, you will use Ipconfig to manage the DNS client cache

30 Practice: Configuring a Client to Use a Name Server In this practice, you will configure a client to resolve names using DNS

31 Lesson: Summarizing Name Resolution Processes How Client Names Are Resolved

32 Enter command 1 1 DNS Server 3 3 Hosts File 4 4 NetBIOS name cache 5 5 WINS Server 6 6 Name is resolved Lmhosts File 8 8 Broadcast 7 7 DNS name cache 2 2


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