General Networking Topics

This chapter covers general networking concepts listed in the CCIE Security blueprint for the written exam. The CCIE Security blueprint lists some example topics that define general networking, including switching, TCP/IP, routed and routing protocols, PPP, ISDN, asynchronous communications, and telephony and wireless best practices.

The CCIE Security written exam contains approximately 50 percent security questions and approximately 50 percent general networking questions. This chapter prepares you for the general networking questions. Although the CCIE Security written exam blueprint lists some specific networking topics, it does not, for example, mention Frame Relay, which might appear on the exam. This chapter covers many of the listed, and a few of the unlisted, general networking topics.

Although these topics are not extensively defined in the blueprint, the CCIE Security written exam might include topics taken from the CCIE Routing and Switching written exam blueprint. This chapter endeavors to cover all bases and provide quality test examples to ensure that you are well prepared to tackle the general networking questions you encounter in the examination.

This chapter covers the following topics:

■ Networking Basics—Discusses the OSI model, concepts, and functions. Topics include the seven layers of the OSI model and common TCP/IP networking examples.

■ Switching and Bridging—Covers the process that today's networks use to switch packets and describes traditional bridging methods. Virtual LANs, spanning tree protocol (STP), and Fast Ethernet Channel are discussed.

■ Routing IP—Covers the most widely-used routed protocol in today's Internet, IP, and the routing protocols available on Cisco routers, such as RIP, EIGRP, OSPF, and BGP. Cisco IOS commands and configuration examples demonstrate the power of routing IP on Cisco routers.

■ PPP, ISDN, Frame Relay, IP Multicast, and Async—Two of the most widely used dialup protocols are PPP and ISDN. Frame Relay is covered briefly to ensure that you have a good understanding of the common terminology used in today's networks. IP multicast and async protocols are also covered.

■ Telephony Best Practices—IP Telephony is one of the largest investments that Cisco has made in its 20-year history. This section covers the best practices used in today's Cisco Voice over IP (VoIP) implementation.

■ Wireless Best Practices—Wireless, another emerging technology, contains a complex array of standards and bodies that have left the IT market rather insecure about wireless. This section helps alleviate some of those concerns by covering the best practices for Cisco wireless networks.

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