Cisco 100-105 Exam

Which first step must a client perform to connect to an internal host when the hostname is known, but the IP address is unknown?

  • A. The client sends the host name in a DNS reply to a DNS server, and the DNS server responds with the host IP address
  • B. The client exchanges IP address information with a DNS server on the same LAN
  • C. The client looks up the hostname in the ARP table to determine the IP address
  • D. The client sends the host name in a DNS request to a DNS server, and the DNS server responds with the host IP address.
Answer: Option D.
Explanation: 

When a client knew about the hostname but not the IP address, it needs to resolve the hostname to the IP address by sending a DNS request to its DNS server.
Notice that the ARP table is responsible for resolving IP address to MAC address only. It has nothing to do with the hostname.

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