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  • Archive for April, 2009

    Cisco IOS Overview

    Monday, April 13th, 2009

    Cisco routers run the Cisco Internetworking Operating System (IOS) with a command-line interface (CLI). The IOS also runs on some Cisco switch models, and it uses CLI. However, in some cases, the IOS CLI on a switch is slightly different than on a router. Furthermore, the IOS on the 1900 series switches is slightly different […]

    Wireless Networks

    Monday, April 13th, 2009

    Conventional Ethernet networks require cables connected computers via hubs and switches. This has the effect of restricting the computer’s mobility and requires that even portable computers be physically connected to a hub or switch to access the network. An alternative to cabled networking is wireless networking. The first wireless network was developed at the University […]

    Bridging and Swtiching

    Monday, April 13th, 2009

    Bridging is used to connect two network segments. This alleviates congestion problems on a single Ethernet segment and extends allowed cabling distances because the segments on each side of the bridge conformed to the same distance limitation as a single segment. This bridge is called “transparent bridging” because the end-point devices do not need to […]

    10 Things You Should Know About the Cisco CCNA Security Certification

    Monday, April 13th, 2009

    1. What industry trends motivated Cisco to create the CCNA Security certification? Cisco created the CCNA Security certification to offer new IT professionals a rapid path to specialization in security as well as to offer experienced networking professionals a path to enhancing their careers with new security knowledge and skills. Security skills are one of […]

    10 Things You Should Know About the Cisco CCNA Voice Certification

    Monday, April 13th, 2009

    1. What are the industry trends that motivated Cisco to create the CCNA Voice concentration? Today, organizations of all types are moving toward a single, IP-based network that carries data, voice, and video traffic. But VoIP and related applications have characteristics and issues that are distinctly different from those of data traffic. Understanding voice networking […]

    CCNP BCMSN(642-812) Lab – AAA dot1x(New)

    Saturday, April 11th, 2009

    Acme is a small shipping company that has an existing enterprise network comprised of 2 switches;DSW1 and ASW2. The topology diagram indicates their layer 2 mapping. VLAN 40 is a new VLAN that will be used to provide the shipping personnel access to the server. For security reasons, it is necessary to restrict access to […]


    Saturday, April 11th, 2009

    A network is defined as a group of two or more computers linked together for the purpose of communicating and sharing information and other resources, such as printers and applications. Most networks are constructed around a cable connection that links the computers, however, modern wireless networks that use radio wave or infrared connections are also […]

    The TCP/IP Model

    Saturday, April 11th, 2009

    TCP/IP and the OSI Reference Model As illustrated in Figure 1.2, the TCP/IP model consists of four layers, each of which can have several sublayers. These layers correlate roughly to layers in the OSI reference model and define similar functions. Some of the TCP/IP layers correspond directly with layers in the OSI reference model while […]

    The 7 Layer OSI Model

    Saturday, April 11th, 2009

    The OSI Reference Model The OSI is the Open System Interconnection reference model for communications. As illustrated in Figure 1.1, the OSI reference model consists of seven layers, each of which can have several sublayers. The upper layers of the OSI reference model define functions focused on the application, while the lower three layers define […]