Embed Size (px)
DESCRIPTION
Examples: A host name is the DNS name, of a device on a network, that is used to locate computers on the network What Are Host Names? FQDN server1.training.company1.com FQDN DNS Suffix Host Name DNS Suffix Host Name Server1 = www = com “.” Root company1 training
Citation preview
Name Resolution
How Names Are Mapped to IP Addresses
Name ResolutionName ResolutionServiceService
192.168.1.200
Myself.com
Where is the myself.com?
Myself.com
1
2
3
Examples:
A host name is the DNS name, of a device on a network, that is used to locate computers on the network
What Are Host Names?
FQDN
www.company1.com
server1.training.company1.com
FQDN
DNS SuffixHost Name
DNS SuffixHost Name
Server1 = 192.168.0.67
www = 192.168.0.66
com
“.” Root
company1
training
The Host Name Resolution Process
Host name resolution is the process of resolving a host name to an IP address
What is the IP address for
Salescomputer2?
Salescomputer2
1 2
3
192.168.1.35Salescomputer2
Client Resolver Cache/Hosts File DNS NetBIOS
Name Cache WINS Broadcast Lmhost File
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 name-to-IP address mappings loaded from the Hosts file
Computer1
Hosts FileResolved 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
Computer1
Hosts File
# Copyright (c) 1993-1999 Microsoft Corp.## 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:## 102.54.94.97 rhino.acme.com # source server# 38.25.63.10 x.acme.com # x client host 127.0.0.1 localhost
Broadcasts
BroadcastRouter
NetBIOS Redirector
The NetBIOS redirector sends out a local broadcast1If the resource is on the local network, the broadcast is answered and an IP address is returned
2
If the resource is on a remote network, then the broadcast will not pass through the router3
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
Broadcastis answered
BroadcastFails
1
2 3
