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10: Sending and Receiving TCP/IP Packets
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8 C Either the DNS server is down or the link between the DNS server and the hub is not operational A, B, and D must be up if PC-A can ping 10021 and 10031 9 B Since Router-B needs to forward information to the next-hop Router-A, the source MAC address used would be Router-B s interface 1 s MAC address, which is 00002222BBBB A is the destination MAC address in this frame C is what PC-B fills in for the destination MAC address to get it to the default gateway D is the source MAC address that PC-B uses
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Cisco Catalyst Switches
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11 12 Cisco IOS Software Initial Switch Configuration 13 14 VLANs and Trunks Switches and Redundancy
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Copyright 2008 by The McGraw-Hill Companies Click here for terms of use
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CERTIFICATION OBJECTIVES
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1101 1102 1103 1104 Introduction to Cisco Device Configuration Command-Line Interface (CLI) IOS Basics Basic IOS Configuration 1105 1106 Basic IOS Security Configuration IOS Operation and Verification Two-Minute Drill Self Test
Copyright 2008 by The McGraw-Hill Companies Click here for terms of use
11: Cisco IOS Software
his chapter begins with a discussion of the applied side of networking It focuses on the command-line interface (CLI) of Cisco s routers and switches, including using a console connection to perform basic configuration on these devices This book emphasizes the fundamental and important concepts of accessing, configuring, and managing Cisco routers and switches These discussions assume that you have never configured a Cisco router or switch; you ll therefore begin with the basics, learning the operating system (OS) used by these devices, the advantages provided by Cisco s OS, and the use of commands to configure a Cisco device The remaining chapters in Part 3 focus specifically on Cisco switch features, while Part 4 focuses on routers
CERTIFICATION OBJECTIVE 1101
Introduction to Cisco Device Configuration
One of the main reasons that Cisco is number one in the enterprise networking marketplace is its Internetwork Operating System (IOS) The IOS provides a function similar to that provided by Microsoft Windows XP or Linux: it controls and manages the hardware on which it is running Basically, the IOS provides the interface between you and the hardware, enabling you to execute commands to configure and manage your Cisco device Originally, the IOS was developed for Cisco routers, but over the last few years, Cisco has been porting the IOS to its other platforms, including the Catalyst switches Cisco has spent many years tweaking and tuning the IOS, and it has added new features as new technologies are introduced to the marketplace Following are some advantages of the IOS:
Features
The IOS includes a wide array of features for protocols and functions that provide connectivity, scalability, reliability, and security solutions for networks of any size The IOS supports a variety of data link layer technologies for LAN and WAN environments, including copper and fiber wiring as well as wireless support
Connectivity
Introduction to Cisco Device Con guration
Scalability
The IOS supports both fixed and modular chassis platforms, enabling you to purchase the appropriate hardware to meet your needs, yet still allowing you to leverage the same IOS CLI to reduce management costs To ensure that your critical resources are always reachable, Cisco has developed many products and IOS features to provide chassis and network redundancy With the IOS, you can strictly control access to your network and networking devices in accordance with your internal security policies
Reliability
Security
Because of the success of its IOS software, Cisco has grown from a garage-based router company to one of the largest companies in the world in a little more than a decade Most enterprise networks, as well as ISPs, use Cisco products in one form or another Actually, a large portion of the Internet backbone is composed of Cisco products With the IOS coupled to a first-class service and support team, few companies compare to Cisco when it comes to customer satisfaction
Router and Switch Connections
Cisco s routers and switches support two types of external connections: ports (referred to as lines) and interfaces Physical ports are used for management purposes and provide an out-of-band method for managing your Cisco product Every Cisco router and switch has a console (con) port; some have an auxiliary (aux) port Out-of-band means that your management tasks do not affect traffic that is flowing through your Cisco product Interfaces are used to connect networking devices together, such as a switch and router or a switch and a PC Interfaces are connected to the backplane of the switch or router You can also use interfaces for management purposes, but doing so might affect the performance of your IOS device These types of connections are called in-band connections The following sections will cover the console port as well as interfaces on your Cisco devices
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