14-B Flashcards
What happens if a host does not have an appropriate IP configuration?
It will not be able to communicate with other hosts or access the Internet, even if the physical connection is sound.
What are the two states reported if the link is available but IP is not correctly configured?
- Limited connectivity
- No Internet access
What does ‘Limited connectivity’ indicate?
The adapter is set to obtain an address automatically, but no DHCP server can be contacted, resulting in an APIPA address.
What does ‘No Internet access’ mean?
The IP configuration is valid for the local network, but Windows cannot identify a working Internet connection.
Which command is used to display IP configuration information in Windows?
ipconfig
What does the ‘ipconfig /all’ command display?
Detailed configuration, including DHCP and DNS servers, MAC address, and NetBIOS status.
What command releases the IP address obtained from a DHCP server?
ipconfig /release AdapterName
What command forces a DHCP client to renew its lease for an IP address?
ipconfig /renew AdapterName
What does the ‘ipconfig /displaydns’ command do?
Displays the DNS resolver cache containing recently queried host and domain names.
What command clears the DNS resolver cache?
ipconfig /flushdns
What does the hostname command return?
The name configured on the local machine.
What is one common troubleshooting step for persistent network problems?
Restarting the computer hardware or the application service.
What does resetting the network stack in Windows do?
Clears any custom adapter configurations and network connections.
What command is used to test basic connectivity on a network?
ping
What address is pinged to verify TCP/IP is installed correctly?
ping 127.0.0.1
What does a successful ping response indicate?
The host can communicate with another host.
What does ‘Reply from SenderIP Destination unreachable’ indicate?
The sending host gets no response to ARP probes.
What is the purpose of the tracert command?
To trace the path a packet of information takes to reach its target.
What does the pathping command do?
Performs a trace and pings each hop router to determine round-trip time and measure link latency.
What are the three main layers where network services can fail?
- Security
- Name resolution
- Application/OS
What command is used to troubleshoot DNS?
nslookup
What does the netstat command do?
Investigates open ports and connections on the local host.
What does the ‘-b’ switch do when using netstat?
Shows the process that has opened the port.
Fill in the blank: If a DHCP server has been reconfigured, use the command _______ to refresh the IP configuration.
ipconfig /renew
True or False: A return value of 0.0.0.0 from ipconfig indicates a valid IP configuration.
False
Does a ping output of ‘Destination host unreachable’ indicate a problem with the default gateway?
No
What tool is best to measure latency between a workstation and a web conferencing server?
ping
