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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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Chapter 6: Voice over IP (VoIP)

Exam Objectives

Describing the purpose and implications of VoIP

Describing the quality of service (QoS) used with VoIP

Differentiating between IP priority at network Layer 3 and class of service (CoS) at data link Layer 2

Describing how a Cisco IP phone produces VoIP packets

Describing how a Cisco IP phone interacts with a Cisco switch

Describing how a Cisco IP phone interacts with a computer host connected to its PC port

Describing Cisco Discovery Protocol (CDP)

Differentiating between trusting and nontrusting switch access ports

Configure switch access ports for VoIP traffic

Read this chapter to find out about Voice over IP (VoIP). VoIP defines a group of network applications, network protocols, and network devices that carry voice signals over the Internet Protocol (IP). More organizations are choosing to use IP telephony to save costs by concentrating their phone and data traffic over the same IP infrastructure.

Using industry standards, Cisco IP phones, Cisco VoIP gateways, Cisco switches, and Cisco routers can provide IP telephony over the same IP network that is used to provide data connectivity. Cisco IP telephony solution is now part of the Cisco Unified Communications solution framework that provides a very large array of data, storage, and telephony networking solutions. Cisco IP telephony provides advanced features such as voice mail, contact centers, fax services, advanced call routing and call forwarding, caller ID, and global corporate ...

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