We can verify the kafka topic properties by running the below command in the installation directory of Kafka
bin/kafka-topics.sh --zookeeper zookeeper.host.name:2181 --topic topic1 --describe
So you will have something like below,
Topic:topic1 PartitionCount:1 ReplicationFactor:3 Configs: Topic: topic1 Partition: 0 Leader: 100 Replicas: 100,101,102 Isr: 100,101,102
So with that information, we can identify that there the replication factor for this topic is 3 and replicas broker node ids.
If we want to verify the same in Zookeeper then follow the below steps,
Login into the Zookeeper node and go to the installation directory and go into bin folder.
Then run zkCli as below
Then Enter the below command and see all the broker nodes id details
Then Enter the below command to know the details about the topic
Please refer below link for more commands, https://cwiki.apache.org/confluence/display/KAFKA/Kafka+data+structures+in+Zookeeper