Computer Networks - lecture2NameResolution

Computer Networks - lecture2NameResolution - Name...

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Unformatted text preview: Name Resolution How Names Are Mapped to IP Addresses Name Resolution Service 1 Where is the 2 3 What Are Host Names? A host name is the DNS name, of a device on a network, that is used to locate computers on the network Examples: Examples: “.” Root FQDN com company1 Host Name DNS Suffix training FQDN Host Name DNS Suffix www = Server1 = The Host Name Resolution Process Client Resolver Cache/Hosts File 1 NetBIOS Name Cache DNS Salescomputer2 What is the IP address for Salescomputer2? 2 WINS Broadcast Lmhost File 3 Salescomputer2 Host name resolution is the process of resolving a host name to an IP address Client Resolver Cache to View and Flush the Client Resolver Cache The client resolver cache is a location in memory that stores host names that have recently been resolved to IP addresses. It also stores host nameto-IP address mappings loaded from the Hosts file Computer1 Hosts File Resolved host names from the DNS server Hosts File The Hosts file is a static file that is maintained on the local computer and that is used to load host name-to-IP address mappings into the client resolver cache # Copyright (c) 1993-1999 Microsoft Corp. Computer1 Hosts File # # This is a sample HOSTS file used by Microsoft TCP/IP for Windows. # # This file contains the mappings of IP addresses to host names. Each # entry should be kept on an individual line. The IP address should # be placed in the first column followed by the corresponding host name. # The IP address and the host name should be separated by at least one # space. # # Additionally, comments (such as these) may be inserted on individual # lines or following the machine name denoted by a '#' symbol. # # For example: # # # source server # # x client host localhost Broadcasts Local broadcasts are network messages, sent from a single computer, that are distributed to all other devices on the same segment of the network as the sending computer 2 Broadcast is answered Broadcast Fails 3 Broadcast Router 1 1 2 NetBIOS Redirector The NetBIOS redirector sends out a local broadcast If the resource is on the local network, the broadcast is answered and an IP address is returned 3 If the resource is on a remote network, then the broadcast will not pass through the router ...
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