100-140 Question 211
Select 3A user reports that they cannot access a website. You suspect that there might be a connectivity issue. Which of the following commands would you use to verify the network connectivity and diagnose the issue?
- A
ping
- B
tracert (or traceroute)
- C
ipconfig (or ifconfig)
- D
nslookup
- E
telnet
Show answer and explanation
Correct answers: A, B, C
Explanation
To verify network connectivity, commands like ping, tracert/traceroute, and ipconfig/ifconfig are fundamental. ping checks if the destination is reachable, tracert/traceroute identifies the path taken by packets, and ipconfig/ifconfig provides information about the local network configuration. While nslookup and telnet are useful for specific functions, they do not directly verify basic connectivity or diagnose routing issues.
- A. Correct.
ping is used to verify connectivity to a specific IP address or hostname. It is often the first step in diagnosing connectivity issues.
- B. Correct.
tracert (Windows) or traceroute (Linux/Mac) helps identify the route packets take to their destination and can reveal network path issues or bottlenecks.
- C. Correct.
ipconfig (Windows) or ifconfig (Linux/Mac) provides information about the local network configuration, such as IP address, subnet mask, and default gateway, which is essential for diagnosing connectivity issues.
- D. Incorrect.
nslookup is used to query DNS servers to resolve domain names, but it does not directly verify network connectivity.
- E. Incorrect.
telnet is used to test application layer connectivity to a specific port, but it is not typically used for general network connectivity verification.