1z0-593 Exam Dumps | Which two statements about the Single Client Access Name (SCAN) feature are correct?

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Question 33/41

Which two statements about the Single Client Access Name (SCAN) feature are correct?

A. In typical Grid Infrastructure Installation, the SCAN name defaults to the cluster name

B. A SCAN listener runs on every cluster node

C. SCAN is available with any version of Oracle 11g RAC

D. SCAN provides location Independence of Oracle RAC databases in the cluster

Correct Answer: A,B

Explanation/Reference:
SCAN components in a cluster:
SCAN Name

SCAN IP, Oracle recommends 3 IP addresses for SCAN for a cluster

SCAN Listener

SCAN Name will represent the cluster in the network. SCAN Name needs to be registered in DNS and resolved using round-robin algorithm. To test the round-robin algorithm, perform nslookup on the SCAN Name. The DNS server should return those 3 set of IP Address in different order each time Incorrect:
Not C: Only from R2:
Prior to Oracle 11g R1 RAC, client connection to RAC Cluster will use each node VIP (virtual IP) address.
So each time a node is added to the cluster, the client tnsnames.ora file needs to be updated with the new VIP addition.
Oracle 11g R2 RAC introduces SCAN (Single Client Access Name) to handle that problem. SCAN provides single name from clients to access the database running in the cluster.

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