DNSSEC is used for?
A. Encrypted DNS queries between nameservers.
B. Cryptographic authentication of DNS zones.
C. Secondary DNS queries for local zones.
D. Defining a secure DNS section.
E. Querying a secure DNS section.
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。