642-845 Optimizing Converged Cisco Networks
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Demo Question 7.
Note: Please refer to EliteCertify Scenario 1 Which DSCP value will the Branch router apply to video traffic destined for the Central site from the video equipment on the local network?
A. 46 (ef)
B. 24 (cs3)
C. 18 (af21)
D. 8 (cs1)
E. no value
F. 10 (af11)
G. None of the above
Display Answer
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Answer: A
Explanation: The classification is carried in the IP packet header, using either the IP precedence or the
preferred Differential Services Code Point (DSCP). These are represented using the first
three or six bits of the Type of Service (ToS) field. Classification can also be carried in
the Layer 2 frame in the form of the Class of Service (CoS) field embodied in ISL and
802.1Q frames.
Once packets are classified at the edge by access layer switches or by border routers, the
network uses the classification to determine how the traffic should be queued, shaped,
and policed.
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