100-160 Question 62
Single answerA network administrator is troubleshooting an issue where a host is unable to resolve domain names to IP addresses. The administrator suspects that the problem is related to one of the key protocols used in the process. Which protocol is responsible for resolving domain names to IP addresses, and should be checked first?
- A
DNS
- B
DHCP
- C
ARP
- D
ICMP
Show answer and explanation
Correct answer: A
Explanation
Domain Name System (DNS) is crucial for converting human-readable domain names into IP addresses that devices can use to communicate. When a host cannot resolve domain names, DNS should be checked first, as it directly handles this functionality. Other protocols like DHCP, ARP, and ICMP serve different purposes in networking and are not related to domain name resolution.
- A. Correct.
DNS (Domain Name System) is the protocol responsible for resolving domain names (e.g., www.example.com) to their corresponding IP addresses. If domain name resolution fails, DNS should be the first protocol to check.
- B. Incorrect.
DHCP (Dynamic Host Configuration Protocol) is used to assign IP addresses and other network configuration parameters to devices on a network, but it is not involved in domain name resolution.
- C. Incorrect.
ARP (Address Resolution Protocol) is used to map IP addresses to MAC addresses within a local network and does not resolve domain names to IP addresses.
- D. Incorrect.
ICMP (Internet Control Message Protocol) is used for error reporting and diagnostic functions, such as ping, but it is not involved in resolving domain names to IP addresses.