From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001 From: Sven Eisenhauer Date: Fri, 10 Nov 2023 15:11:48 +0100 Subject: add new repo --- Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/buttons.html | 109 ++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/content.html | 183 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/index.html | 29 ++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/media.html | 21 +++ 4 files changed, 342 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/buttons.html new file mode 100644 index 0000000..4b55e15 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/buttons.html @@ -0,0 +1,109 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 2.1 + WAN Technologies Overview 
  + 2.1.2 + WAN devices 
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+ + + WANs are groups of LANs connected together with communications links + from a service provider. Because the communications links cannot plug + directly into the LAN, it is necessary to identify the various pieces + of interfacing equipment. +

+ LAN-based computers with data to transmit send data to a router that + contains both LAN and WAN interfaces. + + The router will use the Layer 3 address information to deliver the + data on the appropriate WAN interface. Routers are active and + intelligent network devices and therefore can participate in network + management. Routers manage networks by providing dynamic control over + resources and supporting the tasks and goals for networks. Some of + these goals are connectivity, reliable performance, management + control, and flexibility.

+

The communications link needs signals in an appropriate format. For + digital lines, a channel service unit (CSU) and a data service + unit (DSU) are required. The two are often combined into a single + piece of equipment, called the CSU/DSU. The CSU/DSU may also be built + into the interface card in the router. +

+

A modem is needed if the local loop is analog rather than digital. + Modems + transmit data over voice-grade telephone lines by modulating and + demodulating the signal. The digital signals are superimposed on an + analog voice signal that is modulated for transmission. The modulated + signal can be heard as a series of whistles by turning on the internal + modem speaker. At the receiving end the analog signals are returned to + their digital form, or demodulated.

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When ISDN is used as the communications link, all equipment + attached to the ISDN bus must be ISDN-compatible. Compatibility is + generally built into the computer interface for direct dial + connections, or the router interface for LAN to WAN connections. + Older equipment without an ISDN interface requires an ISDN + terminal adapter (TA) for ISDN compatibility.

+

+ Communication servers concentrate dial-in user communication and remote access to a LAN. They may have a mixture of analog and + digital (ISDN) interfaces and support hundreds of simultaneous users.

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+ + + Interactive Media Activity

+ +

Crossword Puzzle: WAN Devices and Interfaces

+

Upon completing this activity, the student + will be able to describe devices and interfaces associated with + WAN connections.

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+ + Web Links

+ + +

WAN

+ + http://www.cisco.com/en/US/tech/tk713/ + tech_topology_and_network_ serv_and_protocol_suite_ home.html

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