13 Questions
What is the purpose of pinging the loopback address?
To verify TCP/IP is installed and loaded correctly
What does pinging the IP address of the default gateway verify?
It is up and running and you can communicate with a host on the local network
What is the drawback of testing connections to servers such as file shares, printers, or email?
There could be some sort of application fault rather than a network fault
What is the purpose of pinging the IP address of a remote host?
To verify you can communicate through the router
What does a successful ping response include?
Reply from IP Address and the round-trip time (RTT) in milliseconds
What does 'Destination unreachable' message from ping indicate when both hosts are supposed to be on the same local network segment?
No response to Address Resolution Protocol (ARP) probes
What does 'Destination unreachable' message from ping indicate when the gateway router has no forwarding information for that IP address?
The gateway router has no forwarding information for that IP address
What does 'Request timed out' message from ping indicate?
No response from the remote host or network
What can the millisecond (ms) measures of round-trip time (RTT) be used for?
Diagnose latency problems on a link
When would a 'Destination unreachable' message indicate that the sending host gets no response to Address Resolution Protocol (ARP) probes?
When both hosts are supposed to be on the same local network segment
What does a 'Request timed out' message from ping indicate about the destination host?
It is down or configured not to respond
What is the purpose of sending ARP probes?
To locate the hardware or media access control (MAC) address of the interface that owns an IP address
When can you ping DNS names or FQDNs?
When a DNS server is available
Study Notes
Ping Command
- Pinging the loopback address (127.0.0.1) tests the integrity of the TCP/IP stack on the local host.
- Pinging the IP address of the default gateway verifies that the host can communicate with the local network.
Connectivity Testing
- Testing connections to servers such as file shares, printers, or email can be unreliable, as these services may be down or experiencing issues, even if the network is operational.
Remote Host Testing
- Pinging the IP address of a remote host verifies that the host is reachable and responsive.
- A successful ping response includes the response time and the number of packets sent and received.
Ping Errors
- A 'Destination unreachable' message from ping indicates that:
- The destination host is not available on the same local network segment, or
- The gateway router has no forwarding information for that IP address.
- A 'Request timed out' message from ping indicates that the destination host is not responding or is not reachable.
Ping Performance
- Millisecond (ms) measures of round-trip time (RTT) can be used to:
- Evaluate network performance and latency.
- Monitor network quality and detect bottlenecks.
ARP Probes
- A 'Destination unreachable' message can also indicate that the sending host gets no response to Address Resolution Protocol (ARP) probes.
- The purpose of sending ARP probes is to resolve IP addresses to MAC addresses.
- ARP probes are sent to resolve IP addresses to MAC addresses when a device needs to communicate with another device on the same local network.
Ping and DNS
- You can ping DNS names or FQDNs only when the DNS server can resolve the name to an IP address.
Test your knowledge of troubleshooting local network connectivity issues with this quiz. Explore link and IP configuration, server connections, and network topology. Improve your skills in identifying and resolving local network connectivity problems.
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