You work as a Network Administrator for NetTech Inc. When you enter http://66.111.64.227 in the browser's address bar, you are able to access the…

The scenario describes a classic Domain Name System (DNS) resolution failure. DNS is the internet's system for translating human-readable domain names (e.g., www.uCertify.com) into machine-readable IP addresses (e.g., 66.111.64.227). The ability to connect directly via the IP address confirms that the web server is online and the network path to it is functional. The inability to connect using the domain name indicates that the user's system cannot obtain the corresponding IP address from a DNS server. This is most likely because the DNS entry is missing, misconfigured, or the DNS server itself is unreachable.

B. The site's Web server is offline.

This is demonstrably false, as the user can successfully access the site by directly using its IP address.

C. The site's Web server has heavy traffic.

Heavy traffic might cause slow responses or timeouts, but it would not prevent the DNS name from resolving to an IP address.

D. WINS server has no NetBIOS name entry for the server.

WINS (Windows Internet Name Service) is a legacy service for resolving NetBIOS names on local networks and is not used for resolving public internet FQDNs.

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1. Kurose

J. F.

& Ross

K. W. (2017). Computer Networking: A Top-Down Approach (7th ed.). Pearson. In Chapter 2

Section 2.5

"The Internet's Directory Service

" the authors state

"The main function of DNS is to translate hostnames to IP addresses." A failure in this translation process would produce the exact symptoms described in the question.

2. Mockapetris

P. (1987). RFC 1034: Domain Names - Concepts and Facilities. IETF. Section 2.1

"Name space

" explains that the primary purpose of the domain system is to provide a consistent name space for referring to resources

with a key function being the mapping of these names to network addresses.

3. Comer

D. E. (2018). Internetworking with TCP/IP Volume 1: Principles

Protocols

and Architecture (6th ed.). Pearson. Chapter 18

"The Domain Name System

" details the resolution process. It clarifies that an application (like a web browser) must first use a resolver to contact a DNS server to obtain an IP address before it can initiate a TCP connection with a remote server. If this step fails

the connection cannot be made using the name.