200-901 Question 193
Single answerA company is experiencing issues with devices on their network being unable to resolve human-readable domain names to IP addresses. Upon investigation, you determine that a specific IP service is malfunctioning. Which service is most likely causing this issue?
- A
DHCP (Dynamic Host Configuration Protocol)
- B
DNS (Domain Name System)
- C
NAT (Network Address Translation)
- D
NTP (Network Time Protocol)
Show answer and explanation
Correct answer: B
Explanation
The Domain Name System (DNS) is a critical service that resolves domain names into IP addresses, enabling devices to locate and connect to resources on a network or the internet. If devices are unable to resolve domain names, it typically points to a DNS service malfunction.
- A. Incorrect.
DHCP is responsible for dynamically assigning IP addresses to devices on a network. While this can impact connectivity, it does not directly affect the resolution of domain names to IPs.
- B. Correct.
DNS translates human-readable domain names (e.g., www.example.com) to IP addresses (e.g., 192.0.2.1). If DNS is malfunctioning, domain name resolution will fail.
- C. Incorrect.
NAT is used to translate private IP addresses to public IP addresses and vice versa, enabling devices to access the internet. NAT issues would not directly impact domain name resolution.
- D. Incorrect.
NTP is used for synchronizing time across devices on a network. While time synchronization issues can cause other problems, they are unrelated to resolving domain names to IP addresses.