When the hosts file is altered, local name resolution is compromised, and domain queries are redirected to malicious IP addresses. This is a form of DNS spoofing/poisoning, where false mappings trick users into visiting fraudulent websites.

B . Phishing typically uses emails or messages to trick users, not local file modification.

C . VLAN hopping is a Layer 2 attack to gain unauthorized network access, unrelated to DNS.

D . ARP poisoning manipulates ARP tables on a LAN to reroute traffic, not name resolution.

Reference (CompTIA Network+ N10-009):

Domain: Network Security --- DNS poisoning/spoofing, host file manipulation, endpoint attacks.