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N10-009 · Question #321

A network administrator is concerned with on-path attacks and wants to provide encryption of fully qualified domain names in outbound communications. Which of the following best describes the…

The correct answer is B. DoH. To encrypt fully qualified domain names (FQDNs) in outbound communications and mitigate on-path attacks on DNS queries, DNS over HTTPS (DoH) encrypts DNS traffic within an HTTPS tunnel, preventing eavesdropping and tampering of DNS requests.

Submitted by naveen.iyer· Mar 6, 2026Network Security

Question

A network administrator is concerned with on-path attacks and wants to provide encryption of fully qualified domain names in outbound communications. Which of the following best describes the protocol that provides the proper security layer for internet communication?

Options

  • ASSL
  • BDoH
  • CTLS
  • DDNSSEC

How the community answered

(18 responses)
  • A
    6% (1)
  • B
    72% (13)
  • C
    6% (1)
  • D
    17% (3)

Why each option

To encrypt fully qualified domain names (FQDNs) in outbound communications and mitigate on-path attacks on DNS queries, DNS over HTTPS (DoH) encrypts DNS traffic within an HTTPS tunnel, preventing eavesdropping and tampering of DNS requests.

ASSL

SSL (Secure Sockets Layer) is an older, deprecated protocol for securing web traffic; TLS has replaced it and neither specifically encrypts DNS queries in the way DoH does.

BDoHCorrect

DNS over HTTPS (DoH) encrypts DNS queries and responses within an HTTPS tunnel, thus hiding the FQDNs requested from on-path attackers and preventing DNS tampering or eavesdropping.

CTLS

TLS (Transport Layer Security) is a cryptographic protocol that provides secure communication over a network, and while DoH uses TLS, TLS itself isn't the specific protocol for encrypting DNS FQDNs in transit; it's the underlying mechanism.

DDNSSEC

DNSSEC (DNS Security Extensions) provides authentication and integrity for DNS data, preventing spoofing and cache poisoning, but it does not encrypt DNS queries themselves to hide FQDNs from an observer.

Concept tested: DNS privacy and security protocols (DoH)

Source: https://learn.microsoft.com/en-us/windows-server/networking/dns/doh-client-support

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