4. Which is stateless? (A) HTTP (B) FTP (C) SMTP (D) POP3 5. When a host makes a DNS query, the query is most probably first sent to its (A) authoritative name server (8) root name server (C) top-level domain server (D) local name server 6. Each Web object is addressable by a (A) HTTP (B) HTML (C) XM (D) URL What is the type of the answer to a DNS query for the name of a mail server? (A) Type A (B) Type NS (C) Type CNAME (D) Type MX 7. 8. Which are unguided media? (A) twisted-pair copper wire (B) coaxial cable (C) power-line wire (D) radio channels 9. Which uses existing telephone infrastructure? (A) ADSL (B) Ethernet (C) cable modem (D) WiFi 10. Which HTTP response status code means the requested document not found on this server? (A) 200 (B) 301 (C) 404 (D) 505