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_4/buttons.html | 110 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/content.html | 92 +++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/index.html | 29 ++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/media.html | 21 ++++ 4 files changed, 252 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/buttons.html new file mode 100644 index 0000000..23a8321 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_4/buttons.html @@ -0,0 +1,110 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 2.3 + WAN Design 
  + 2.3.4 + Three-layer design model 
+ + + + + + +
+ A systematic approach is needed when many locations + must be joined. A hierarchical solution with three layers offers many + advantages. + +

Imagine an enterprise that is operational in every country of the + European Union and has a branch in every town with a population over + 10,000. Each branch has a LAN, and it has been decided to interconnect + the branches. A mesh network is clearly not feasible because nearly + 500,000 links would be needed for the 900 centers. A simple + star will be very difficult to implement because it needs a router + with 900 interfaces at the hub or a single interface that carries 900 + virtual circuits to a packet-switched network.

+

Instead, consider a hierarchical design model. A group of LANs in an + area are interconnected, several areas are interconnected to form a + region, and the various regions are interconnected to form the core of + the WAN.

+

The area could be based on the number of locations to be connected + with an upper limit of between 30 and 50. The area would have a star + topology, + + with the hubs of the stars linked to form the region. + + + Regions could be geographic, connecting between three and ten areas, + and the hub of each region could be linked point-to-point. +

+

This three-layer model follows the hierarchical design used in telephone + systems. The links connecting the various sites in an area that + provide access to the enterprise network are called the access links + or access layer of the WAN. Traffic between areas is distributed by + the distribution links, and is moved onto the core links for transfer + to other regions, when necessary.

+

This hierarchy is often useful when the network traffic mirrors the + enterprise branch structure and is divided into regions, areas, and + branches. It is also useful when there is a central service to which + all branches must have access, but traffic levels are insufficient to + justify direct connection of a branch to the service.

+

The LAN at the center of the area may have servers providing + area-based as well as local service. Depending on the traffic volumes + and types, the access connections may be dial up, leased, or Frame + Relay. Frame Relay facilitates some meshing for redundancy without + requiring additional physical connections. Distribution links could be + Frame Relay or ATM, and the network core could be ATM or leased line.

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