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Questions and Answers
What is the purpose of pinging the loopback address?
What is the purpose of pinging the loopback address?
- To test whether a host can communicate with another host on a remote network
- To check for possible duplicate IP addresses
- To verify communication with a host on the local network
- To verify TCP/IP is installed and loaded correctly (correct)
What does pinging the IP address of the default gateway verify?
What does pinging the IP address of the default gateway verify?
- Communication with a host on the local network
- Possible duplicate IP addresses
- It is up and running and you can communicate with a host on the local network (correct)
- Communication through the router
What is the drawback of testing connections to servers such as file shares, printers, or email?
What is the drawback of testing connections to servers such as file shares, printers, or email?
- It verifies TCP/IP is installed and loaded correctly
- It may lead to duplicate IP addresses
- It tests communication through the router
- There could be some sort of application fault rather than a network fault (correct)
What is the purpose of pinging the IP address of a remote host?
What is the purpose of pinging the IP address of a remote host?
What does a successful ping response include?
What does a successful ping response include?
What does 'Destination unreachable' message from ping indicate when both hosts are supposed to be on the same local network segment?
What does 'Destination unreachable' message from ping indicate when both hosts are supposed to be on the same local network segment?
What does 'Destination unreachable' message from ping indicate when the gateway router has no forwarding information for that IP address?
What does 'Destination unreachable' message from ping indicate when the gateway router has no forwarding information for that IP address?
What does 'Request timed out' message from ping indicate?
What does 'Request timed out' message from ping indicate?
What can the millisecond (ms) measures of round-trip time (RTT) be used for?
What can the millisecond (ms) measures of round-trip time (RTT) be used for?
When would a 'Destination unreachable' message indicate that the sending host gets no response to Address Resolution Protocol (ARP) probes?
When would a 'Destination unreachable' message indicate that the sending host gets no response to Address Resolution Protocol (ARP) probes?
What does a 'Request timed out' message from ping indicate about the destination host?
What does a 'Request timed out' message from ping indicate about the destination host?
What is the purpose of sending ARP probes?
What is the purpose of sending ARP probes?
When can you ping DNS names or FQDNs?
When can you ping DNS names or FQDNs?
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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.
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