The Cisco GSS serves as an authoritative name server for one or more domains. When deploying it behind a firewall, which three options need to be configured on the firewall to permit communication through to it? (Choose three.)

A.
CDP messages

B.
keepalive protocol (KAL-AP, ICMP, HTTP, and user defined TCP ports)

C.
other protocols (FTP, Telnet, SSH, SNMP)

D.
DNS queries
A Composite Solution With Just One Click – Certification Guaranteed 52 Cisco 642-975: Practice Exam