What is DNSSEC used for?
A. Encrypted DNS queries between nameservers
B. Cryptographic authentication of DNS zones
C. Secondary DNS queries for local zones
D. Authentication of the user that initiated the DNS query
E. Encrypting DNS queries and answers
題解
DNSSEC(DNS Security Extensions)用來解決DNS所面臨的安全性問題，利用數位簽章(Digital Signature)來驗證傳遞的訊息，解決常見的偽裝(forge)資料和快取下毒(cache poisoning)的問題。
所以答案是選項「B」。