An ISP help desk technician receives a call from a customer who reports that no one at their business can reach any websites or get their e-mail. After testing the communication line and finding everything fine, the technician instructs the customer to run nslookup from the command prompt. What does the technician suspect is causing the customer’s problem?
- improper IP address configuration on the host
- hardware failure of the ISR used to connect the customer to the ISP
- bad cables or connections at the customer site
- failure of DNS to resolve names to IP addresses