Home » Cisco » 642-427 » Voice bearer traffic will be set to use which per-hop behavior?
The following is a partial configuration of an access layer switch:
mls qos map cos-dscp 0 8 12 16 28 32 40 48
mls qos
!
Voice bearer traffic will be set to use which per-hop behavior?
A. EF
B. CS4
C. AF32
D. AF12
E. BE
Correct Answer: B
Explanation/Reference:
Explanation:
The LAN CoS maps voice to 8 classes 0 through 7, example below:
cos: 0 1 2 3 4 5 6 7
you then map values to each of these classes for dscp, below is the default values (note that there is no EF (46) equivalent):
cos: 0 1 2 3 4 5 6 7
–
dscp: 0 8 16 24 32 40 48 56
So the question has mapped the class “5” (the voice bearer class) to a value of32 “0 8 12 16 283240 48”. This will give it a per hop behavior of CS4/Prec 4
