Correct Answer: C
In the context of Cisco routers, to analyze a subset of packets, a sampling method is used. The correct command set to configure the router to sample 50 packets out of every 100 would involve setting up a flow sampler map that defines the rate at which packets are sampled. In this case, since we want to sample 50 out of every 100 packets, we need to specify a sampling rate where one out of every two packets is sampled. This can be achieved with the following configuration:
sampler SAMPLER-1
mode random 1-out-of-2
!
flow monitor FLOW-MONITOR-1
record netflow original-input
exporter EXPORTER-1
cache timeout active 60
sampler SAMPLER-1
!
interface GigabitEthernet0/0/0
ip flow monitor FLOW-MONITOR-1 input sampler SAMPLER-1
This configuration creates a sampler called "SAMPLER-1" that randomly selects one packet out of every two for analysis (which equates to analyzing 50% or 50 out of every 100 packets). The flow monitor
"FLOW-MONITOR-1" is then applied to an interface with the specified sampler.