Network &Network Devices Introduction. 2000, Cisco Systems, Inc. 1-1

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Transcription:

Network &Network Devices Introduction 2000, Cisco Systems, Inc. 1-1

Objectives Upon completion of this course, you will be able to perform the following tasks: Describe network/ internetwork Types of network Key challenges in implementing a network Devices and media used in Lan /Wan 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-2

Network Collection of computers, printers, routers, switches, and are able to communicate with each other over some transmission media 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-3

Types of Networks Two basic types of networks Local Area Networks (LAN) a group of computers and network communication devices within a limited geographic area, such as an office building. 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-4

Types of Networks Wide Area Networks (WAN) Interconnects LANs. Not restricted to a geographical place 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-5

Internetwork Internetwork is a collection of independent remote networks, LANs and WANs, and their connecting devices. 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-6

Internetworking Challenges Challenges fall into 4 main areas 1. Connectivity 2. Reliability 3. Network management 4. Flexibility Connectivity Challenge in connecting systems between disparate technologies Reliability Individual users and entire organization depends on consistent, reliable access to network resources 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-7

Internetworking Challenges Network Management Management challenges include providing centralized support for the network users as well as configuration, security, performance, and troubleshooting Flexibility Designing and configuring a network with flexibility in mind is key for Issue of network expansion and adoption of new devices or services 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-8

LAN devices Repeaters regenerate and propagate signals. do not change & filter any information being transmitted. Hubs connect all computer LAN connections into one device. Nothing more than multiport repeaters. Bridges Intelligent repeaters. But unlike repeaters, determine destinations. 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-9

LAN devices Switches Same as hubs. Direct and filter information to and from. Routers Able to route, filter information. Intelligent routers can automatically detect problems. 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-10

Wan devices There are numerous devices associated with data information flow across a WAN. Together. Router Able to route, filter information. Intelligent routers can automatically detect problems ATM Switch ATM Switches provide high-speed transfer between both LANs and WANs. This technology is not further covered in CCNA 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-11

Wan devices Modem (modulator / demodulator) Source, modems convert digital signals to analog. Destination, modems convert the signal back to a digital format. CSU/DSU (Channel Service Unit / Data Service Unit) CSUs/DSUs similar to modems, send data in digital format across digital telephone loops. They may come in two separate units: CSUs or DSUs. 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-12

Wan devices Multiplexer Multiplexer combines multiple signals for transmission over a single circuit. This allows for the transfer of various data simultaneously, such as video, sound, text, etc. This technology is not further covered in CCNA X.25/Frame Relay Switches X.25 and Frame Relay Switches connect private data over public data circuits using digital signal. These units are very similar to ATM switches, but the transfer rate of data is not comparable. 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-13

Metropolitan Area Network Metropolitan Area Networks (MANs) Overview Hybrid between LANs and WANs.More closely resemble the features of the larger WAN.MANs 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-14

MAN vs. WAN MAN Generally high speeds Short distances Leased lines Remote carrier Usually comparably inexpensive Great predicted expansion for the future WAN Generally low speeds Typically, long distances Leased lines Point-to-Point link Quite expensive in comparison Continued growth for the future, depends on up rise of MANs 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 1-15

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