1Z0-078 practice question 13 of 15

Identify three prerequisites for the successful installation of Oracle Grid Infrastructure 19c when using Full Featured Grid Naming Service (GNS). (Choose three.)

Answer options

A: Each cluster node must have at least two network interface cards.

B: You must enable the Name Server Cache Daemon Correct answer

C: A DHCP service on the private network for the cluster is required to allocate virtual IP addresses for HAIP.

D: A DHCP service on the public network for the cluster is required to allocate virtual IP addresses as required by the cluster. Correct answer

E: DNS must be configured to delegate name resolution for the cluster subdomain to the cluster. Correct answer

F: You must create a Grid Management Repository database.

Correct Answer:

B. You must enable the Name Server Cache Daemon; D. A DHCP service on the public network for the cluster is required to allocate virtual IP addresses as required by the cluster.; E. DNS must be configured to delegate name resolution for the cluster subdomain to the cluster.

Explanation

For full-featured Grid Naming Service the cluster relies on DHCP to supply public-network VIP addresses dynamically, and DNS must delegate the cluster sub-domain to the GNS VIP so that all names resolved by GNS are reachable. Because GNS responses are cached on each node, Oracle requires the Name Service Cache Daemon (nscd) to be enabled and running before installation begins.

Why Incorrect

A. Full-featured GNS can operate with a single NIC; two separate cards are not mandatory.
C. HAIP uses addresses in the 169.254. range and does not require DHCP on the private network.
F. The Grid Management Repository database is created automatically during installation when required; it is not a prerequisite.

References

1. Oracle® Grid Infrastructure Installation Guide 19c for Linux, 6.8.2 “Requirements for Using Full-featured GNS” – bullets 2 (DNS delegation) and 3 (DHCP on public network).

2. Same guide, 6.8.2 – bullet 5 “Ensure nscd is enabled and running on all nodes”.

3. Oracle® Clusterware Networking Guide 19c, Sec. 2.3 “High Availability IP (HAIP) addresses”, explaining that HAIP is self-assigned and independent of DHCP.

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