220-1201 Practice Question: A company's internal website is accessible by IP…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  DHCP

  Why it's wrong here

  DHCP (Dynamic Host Configuration Protocol) is responsible for dynamically assigning IP addresses, subnet masks, default gateways, and DNS server addresses to client devices on a network. While it provides the client with the address of the DNS server to use, DHCP itself does not perform the translation of a hostname into an IP address. Its primary role is network configuration and address management, not name resolution, making it unrelated to why a website is only accessible by its numerical IP.

• ✗

  NAT

  Why it's wrong here

  Network Address Translation (NAT) is a method of remapping one IP address space into another by modifying network address information in the IP header of packets while they are in transit. Its primary function is to allow multiple devices on a private network to share a single public IP address when accessing the internet, or to translate between different private IP ranges. NAT does not resolve hostnames to IP addresses; it only translates existing IP addresses, thus it cannot be the reason a hostname isn't working.

• ✓

  DNS

  Why this is correct

  The Domain Name System (DNS) is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. Its fundamental purpose is to translate human-readable domain names and hostnames, like 'internal.company.com', into numerical IP addresses, such as '192.168.1.10', which computers use to identify each other on a network. If a company's internal website is accessible by IP address but not by its hostname, it strongly indicates that the corresponding DNS record is either missing, incorrect, or inaccessible, preventing the name-to-IP resolution.

• ✗

  RADIUS

  Why it's wrong here

  Remote Authentication Dial-In User Service (RADIUS) is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users connecting to a network service. It is commonly used for verifying user credentials when accessing Wi-Fi networks, VPNs, or dial-up connections, ensuring only authorized users gain access. RADIUS has no function in translating hostnames to IP addresses; its role is purely access control and security, making it irrelevant to the problem of name resolution.

Go deeper

Related to this question