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_3_1/buttons.html | 110 +++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/content.html | 130 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/index.html | 29 +++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/media.html | 21 ++++ 4 files changed, 290 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/buttons.html new file mode 100644 index 0000000..6c5273b --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_1/buttons.html @@ -0,0 +1,110 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 2.3 + WAN Design 
  + 2.3.1 + WAN communication 
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WANS are considered to be a set of data + links connecting routers on LANs. User end stations and servers on LANs + exchange data. Routers pass data between networks across the + data links.

Because of cost and + legal reasons, a communications provider or a common carrier normally + owns the data links that make up a WAN. The links are made available to + subscribers for a fee and are used to interconnect LANs or connect to + remote networks. WAN data transfer speed (bandwidth) is considerably + slower than the 100 Mbps that is common on a LAN. The charges for link provision are + the major cost element of a WAN and the design must aim to provide + maximum bandwidth at acceptable cost. With user pressure to provide more + service access at higher speeds and management pressure to contain cost, + determining the optimal WAN configuration is not an easy task.

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WANs carry a variety of traffic types + such as data, voice, and video. The design selected must provide + adequate capacity and transit times to meet the requirements of the + enterprise. Among other specifications, the design must consider the + topology of the connections between the various sites, the nature of + those connections, and bandwidth capacity. +

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Older WANs often consisted of data links + directly connecting remote mainframe computers. + Today’s + WANs, though, connect geographically separated LANs. + End-user + stations, servers, and routers communicate across LANs, and the WAN data + links terminate at local routers. By exchanging Layer 3 address + information about directly connected LANs, routers determine the most + appropriate path through the network for the required data streams. + Routers can also provide quality of service (QoS) management, which + allots priorities to the different traffic streams. + +

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Because the WAN is merely a set of + interconnections between LAN based routers, there are no services on the + WAN. WAN technologies function at the lower three layers of the OSI + reference model. + Routers + determine the destination of the data from the network layer headers and + transfer the packets to the appropriate data link connection for + delivery on the physical connection.

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+ + Web Links

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Introduction to WAN Technologies

+ + http://www.cisco.com/univercd/cc/
+ + td/doc/cisintwk/ito_doc/introwan.htm

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