Transcript Exploring the network

Chapter 5e
 Upon
completion of this chapter, you should
be able to:
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Find IP configuration settings on Windows & Linux
Troubleshoot IP configuration problems
Use the ipconfig command prompt command
Tell if a host is using APIPA
Identify the difference between netstat and
nbtstat
Use the tracert command to find problesm in
routing
5.8.1
 Host
A is connected to the LAN, but it can’t
get access to the Internet. What’s the
problem?
 Common
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situations:
Install a server OS on virtual machine for testing
& you accidently activate DHCP
Mobile hotspot enabled on phone & DHCP server
is enabled on it
 Some
hosts may get an IP from the rouge
DHCP server & not be able to communicate
5.8.2
 Ipconfig
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IP address, SM DG
 Ipconfig
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/all
Lots more
 Ipconfig
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Let’s go of a DHCP assigned address
 Ipconfig
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/release
/renew
Gets a new IP address from DHCP
5.8.3
 Works
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pretty much like ipconfig but on Linux
As a standard user, you can view IP info
As a super user, you can modify the IP info
 Review
TestOut 5.8.3
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TestOut Lab 5.8.5- Explore IP Configuration
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TestOut Lab 5.8.6- Troubleshoot IP Configuration Problems 1
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TestOut Lab 5.8.7- Troubleshoot IP Configuration Problems 2
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TestOut Lab 5.8.8- Troubleshoot IP Configuration Problems 3
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TestOut Lab 5.8.9- Troubleshoot IP Configuration Problems 4
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TestOut 5.8.10- Practice Questions (5)
5.9
 Tests
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connectivity
Can’t get to a website? Try and ping it.
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Success= site is up/DNS problem
Fail= other problem/site down
 Echo
request/echo reply
 Try ping destination first, then close to far
 Shows
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the path the packet takes
Can identify exactly where problem is
 Windows-
tracert www.cisco.com
 Linux- traceroute www.cisco.com
 Measures
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hops (going through a router)
Any * timed out * may mean the router ignores
the ICMP traceroute traffic
Example Next Slide
 Views
ARP table (IP-MAC)
 Displays
detailed info about how your
computer is communicating with other
computers or network devices
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Info/statistics about the network interfaces,
active connections, ports, etc.
 Netstat,
netstat –a
 5.9.1-
Network Communication
Troubleshooting
 5.9.2- Using Ping & Tracert
 5.9.4/5.9.5- Using arp, netstat
 5.9.6- LAB
 5.9.7- Practice Questions
5.10
 5.10.1-
Name Resolution Troubleshooting
 5.10.2- Fact Sheet (Review)
 5.10.3- Using nslookup
 5.10.4- LAB
 5.10.5- Practice Questions
Chapter 5e