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“Optimizing Converged Cisco Networks”, also known as 642-845 exam, is a Cisco certification.
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The following information provide you some 642-845 exam kownledge:

Cisco VoIP implementations Description
Describe the functions and operations of a VoIP network (e.g., packetization, bandwidth considerations, CAC, etc.).
Describe and identify basic voice components in an enterprise network (e.g. Gatekeepers, Gateways, etc.)

QoS considerations Description.
Explain the necessity of QoS in converged networks (e.g., bandwidth, delay, loss, etc.).
Describe strategies for QoS implementations (e.g. QoS Policy, QoS Models, etc.).

DiffServ QoS implementations Description.
Describe classification and marking (e.g., CoS, ToS, IP Precedence, DSCP, etc.).
Describe and configure NBAR for classification.
Explain congestion management and avoidance mechanisms (e.g., FIFO, PQ, WRR, WRED, etc.).
Describe traffic policing and traffic shaping (i.e., traffic conditioners).
Describe Control Plane Policing.
Describe WAN link efficiency mechanisms (e.g., Payload/Header Compression, MLP with interleaving, etc.).
Describe and configure QoS Pre-Classify.

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