cisco network academy program ccna

... host in the network is connected to the central device with its own cable When a star network is expanded to include additional networking devices that are connected to the main networking device, ... protocol header extended-star topology A network in which a star network is expanded to include an additional networking device that is connected to the main networking device extranet Intranet-based ... address that uniquely identifies each node of a network This address controls data communication for the host on the network metropolitan-area network (MAN) A network that spans a metropolitan area

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... travels through networks B. A model that describes how data makes its way from one application program to another throughout a network C. A conceptual framework that specifies which network functions ... the network layers? A. 1: Physical 2: Data link 3: Transport 4: Network 5: Presentation 6: Session 7: Application Trang 2110 Chapter 2: Networking FundamentalsB. 1: Physical 2: Data link 3: Network ... Presentation 7: Application C. 1: Physical 2: Data link 3: Network 4: Session 5: Transport 6: Application 7: Presentation D. 1: Physical 2: Network 3: Session 4: Data link 5: Transport 6: Application

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... 100 Mbps. Used in Fast Ethernet networks. ■ Category 5e (CAT 5e)—Used in networks running at speeds up to 1000 Mbps (1 Gbps). Used in Gigabit Ethernet (GigE) networks. ■ Category 6 (CAT 6)—The ... on two types of copper cable used for networks: ■ Twisted-pair—Twisted-pair cables are composed of one or more pairs of copper wires. Most data and voice networks use twisted-pair cabling. ■ ... 2:53 PM 124 Chapter 3: Networking Media Twisted-Pair Cable Twisted-pair cable is a type of cabling that is used for telephone communications and most modern Ethernet networks. A pair of wires

Ngày tải lên: 04/07/2014, 18:20

... despite its advantages, coaxial cable is no longer commonly used in Ethernet networks. Although many bus topology networks still utilize coaxial cable in use throughout the world, the IEEE no ... outlined LAN cabling specifications. IEEE 802.3 is a standard for Ethernet networks, and IEEE 802.5 is a Token Ring network standard. The Underwriters Laboratories issues standards that are ... outlet: ■ A telephone cable for voice ■ A network cable for data The voice cable must be a 2-pair UTP cable with its correct connectors, or terminators. The network cable must be one of the following

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... connectors, and fibers that are always required on an optical network, you can sometimes see several other devices on an optical fiber network Repeaters are optical amplifiers that receive attenuating ... Many characteristics of fiber-optic media are superior to copper Every fiber-optic cable used for networking consists of two glass fibers encased in sep-arate sheaths One fiber carries transmitted ... as the light source, often within LANs or distances of a couple hundred meters within a campus network Single-Mode Polymeric Coating Glass Cladding 125 Microns d/a Glass Core = 5.8 Microns Requires

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... 20, 2003 2:53 PM 158 Chapter 3: Networking Media ■ 5 GHz—Recently, the FCC opened up the 5-GHz band for unlicensed use by high-speed data communications devices. Cisco has acquired 5-GHz technology ... reliable range of up to 25 miles. The Cisco Aironet 340 Wireless LAN Series can deliver 11-Mbps throughput because it operates in the 2.4-GHz frequency. Cisco has acquired 5-GHz technology and ... signal travels through a fiber, 1102.book Page 149 Tuesday, May 20, 2003 2:53 PM 150 Chapter 3: Networking Media the more it loses strength. This attenuation of the signal is due to several factors

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... technology ensures that deployed networks are interoperable and in compliance Just as in cabled networks, IEEE is the prime issuer of standards for wireless networks The standards have been created ... high-speed transfers of cabled networks nor the security and uptime reli-ability, the flexibility justifies the trade off When considering the installation of a network in an existing facility, ... com-patibility is extremely important because it allows upgrading of the wireless network without replacing the network interface cards (NICs) or access points IEEE 802.11b devices achieve the

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... corporate network is allowed Mutual authentication protects enterprises from unauthorized APs serving as a potential entrance into the network LEAP is the type of authentication pri-marily used on Cisco ... little as 1 watt into the RF spectrum can cause major network disrup-tion Wireless phones operating in the 2.4-GHz spectrum can also cause network degradation ■ Weather—Generally, the RF signal ... an omnidirectional antenna Trang 2170 Chapter 3: Networking MediaFigure 3-50 Omnidirectional Antenna Wireless Security The exponential growth of networking, including wireless technologies, has

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... the network will be too high for the LAN or WAN connections to be useful Networking media is literally and physically the backbone of a network Inferior quality network cabling results in network ... Inferior quality network cabling results in network failures and in networks with unreliable performance All three categories of networking media (copper-based, optical fiber, and wireless) require ... wireless networking media involves certain electrical and mathematical concepts and terms, such as signal, wave, frequency, and noise Understanding this vocabulary is helpful when learning about networking,

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... atmosphere, or space, as the medium), networking media confines network signals to a wire, cable, or fiber Networking media are considered Layer 1 components of LANs Computer networks can be built with many ... the network As noted in Table 4-2, 10-Mbps Ether-net typically is implemented at the end-user level to connect to desktops, and faster technologies are used to interconnect to servers and network ... ports can make this prohibitive Before making this decision, you must determine network requirements For example, a network running at traditional Ethernet speeds of 10 Mbps can be easily overwhelmed

Ngày tải lên: 04/07/2014, 18:20

... length for UTP cable in a network is 100 meters (approximately 333 feet). If you have to expand the network beyond that limit, you need to add a repeater. In most Ethernet networks this repeater ... shows a GBIC, and Figure 4-22 shows a Cisco WS-X2931 Gigabit Ethernet Module with the GBIC out. Figure 4-21 Gigabit Interface Converter (GBIC) Figure 4-22 Cisco WS-X2931 Gigabit Ethernet Module ... 4-30, is to regenerate and retime network signals at the bit level to allow them to travel a longer distance on the media. Repeaters are commonly used if too many network nodes exist or the number

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... Server Relationships 227 Peer-to-Peer Networks In a peer-to-peer network, the networked computers act as equal partners, or peers, to each other. Peer-to-peer networks are also referred to as workgroups. ... the transmitter to operate. An IR-based network suits environments where all the digital devices that require network connectivity are in one room. IR networking technology can be installed ... onto the corporate network is allowed. Mutual authentication protects enterprises from unauthorized access points serving as a potential entrance into the network. The Cisco LEAP authentication

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... guard access to the network By centralizing user accounts, security, and access control, server-based networks simplify the work of network administration The concentration of network resources ... include facilities for enhancing the network by adding new services that extend the usefulness of the network The distribution of functions in client-server networks brings substantial advantages, ... Peer-to-Peer Network Advantages of a Client-Server Network Less expensive to implement Provides for better security and scalability Does not require NOS server software Easier to administer when the network

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... a network B. Equipment that serves as the data source or destination C. Physical devices such as protocol translators and multiplexers D. Devices that make up the network end of the user-to-network ... from the distribu-tion tap to the Cisco uBR905 router, following the instrucdistribu-tions in Step 4 Setting Up Console Connections To initially configure your Cisco device, you need to provide ... connec-tion directly to the device For Cisco equipment, this management attachment is called a console port The console port enables you to monitor and configure a Cisco hub, switch, or router The

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... segmentation of a network and the devices used to create the segments Trang 3Chapter 5Ethernet Fundamentals Ethernet, in its various forms, is the most widely used local-area network (LAN) tech-nology ... Ethernet was designed to fill the middle ground between long-distance, low-speed networks and specialized, computer-room networks carrying data at high speeds for very limited distance Ethernet is ... collisions on Ethernet networks In addition, this chapter introduces collision domains and broadcast domains Finally, this chapter describes seg-mentation and the devices used to create network segments

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... sends data out on a network, the data carries the MAC address of its intended destination. As this data propagates along the network medium, the NIC in each device on the network checks to see ... ■ Detecting errors within data packets or on the network In the CSMA/CD access method, networking devices with data to transmit over the networking media work in a listen-before-transmit mode ... check to see whether the networking medium is busy. The device must check whether there are any signals on the networking media. After the device determines that the network- ing media is not

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... resolving contention for network access A few colli-sions provide a smooth, simple, low-overhead way for network nodes to arbitrate con-tention for the network resource When the network cannot operate ... transmitting devices on the network have backed off for a certain period of time (random and, therefore, different for each device), any device can attempt to gain access to the networking media once ... an occurrence is fairly rare and happens only under extremely heavy network loads or when a physical problem exists on the network In a special situation, the MAC sublayer experiences much more

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... sharing on data networks, 45 sneakernet, 44 file systems, verifying, 667–668 files, Cisco IOS Software naming conventions, 654–655 filtering, 356 final configuration procedures for Cisco routers, 603 finish ... ports, 535–536 managing Cisco IOS Software with ROMmon, 662–667 with TFTP, 660–661 Manchester encoding, 318 MANs (metropolitan-area networks) versus LANs and WANs, 52 mapping networks with CDP, 627 Mb ... 690–693 multiprotocol routing, 680 network addresses, 677 path determination, 675, 678 routing, 676 routing functionality, 679 switching, 678 network layer, 72 network troubleshooting methodology Layer...

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... PM ii Cisco Networking Academy Program CCNA 1 and 2 Companion Guide Third Edition Cisco Systems, Inc. Cisco Networking Academy Program Copyright © 2003 Cisco Systems, Inc. Published by: Cisco ... iv Tuesday, May 20, 2003 2:53 PM Cisco Networking Academy Program CCNA 1 and 2 Companion Guide Third Edition Cisco Systems, Inc. Cisco Networking Academy Program Cisco Press 201 West 103 rd Street Indianapolis, ... Academy program, then you are not preparing with a Cisco trained and authorized Networking Academy provider. For information on the Cisco Networking Academy Program or to locate a Networking Academy, ...

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... reliance on the network, expands. To meet the many educational needs of the internetworking community, Cisco Systems established the Cisco Networking Academy Program. The Networking Academy is a ... the Cisco Networking Academy Program is in the forefront of this transformation. This Cisco Press title is one of a series of best-selling companion titles for the Cisco Networking Academy Program. ... xxvii Introduction Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Third Edition, supplements your classroom and laboratory experience with the Cisco Networking Academy Program, whose...

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