You need to make sure that you know how to verify IP access- list configurations and how to monitor their usage. Access lists can be quite deceiving, even for the most experienced network administrator. Read the full story

Integrated Services Digital Network (ISDN) is a very popular type of connectivity, if you can get it. It provides enough bandwidth to allow voice and data transmission at fast speeds, making it very useful for telecommuters. Read the full story

This section looks at the tools provided to verify the configuration and connectivity on a Cisco IOS router. You’ll examine a router’s configuration and learn how to view the configuration, status, and statistics on a router’s interface. Read the full story

This section talks about extended access lists, which can filter data traffic at more specific variables. Let’s take a close look at these lists and then check out an actual production router’s configured access lists. Read the full story

Interior gateway protocols (IGPs) are used to dynamically configure routers in an autonomous system (AS). Examples of IGPs are Routing Information Protocol (RIP), Cisco’s Interior Gateway Routing Protocol (IGRP), and Enhanced Interior Gateway Routing Protocol (EIGRP). Read the full story

In order to have a good understanding of ISDN, you need to know more than its uses. You need to know about ISDN’s protocol groups, its protocols, how to identify reference points, and ISDN channels. Read the full story

When you are working in a production environment that uses Frame Relay and while you are studying for the CCNA exam, this topic is an important one. Read the full story

To prepare you for this portion of the CCNA exam, this section demonstrates how to configure a Cisco router to be used in a Frame Relay network. It explains the steps for configuring a router to use the Frame Relay encapsulation, assigning a DLCI number, and choosing a Local Management Interface Read the full story

This section discusses the terminology used for the various features within a Frame Relay network. You will learn how two internetwork devices communicate end-to-end through a Frame Relay cloud by using a DLCI number, DTE, DCE, demarcation (demarc), local loop, and PSE. Read the full story

This section starts off by taking a look at the Department of Defense’s version of TCP/IP, and then compares it and its protocols with the OSI Reference Model. This section reviews the functions of TCP/IP at the Network layer Read the full story