Definition of Key Terms

Define the following key terms from this chapter, and check your answers in the glossary:

voice over IP (VoIP), public switched telephone network (PSTN), IP telephony, call agent, gateway, gatekeeper, Multipoint Control Unit (MCU), Media Gateway Control Protocol (MGCP), Skinny Client Control Protocol (SCCP), Session Initiation Protocol (SIP), Real-time Transport Protocol (RTP), RTP Control Protocol (RTCP), Secure RTP (SRTP), spam over IP telephony (SPIT), vishing, auxiliary VLAN

Key Topic

This chapter covers the following topics:

Exploring firewall technology: This section explores the evolution of firewall technology. It also examines the use of firewalls to construct an overall network defense.

Using ACLs to construct static packet filters:

This section examines access control lists (ACL) and how they can be used to construct a static packet-filtering mechanism for your environment. This section also looks at the construction of ACLs and examines how to place them on router interfaces to achieve the desired results.

Implementing a Cisco IOS zone-based firewall: Zone-based firewalls represent a significant advance in firewall technology. This section explores this new technology and describes working with zone pairs.

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