| A | B |
|---|
| LAN Design Goals | Functionality, Scalability, Adaptability, Manageability |
| critical components of the overall LAN design | The function and placement of servers; Collision detection; Segmentation; Bandwidth versus broadcast domains |
| 2 classes of servers | enterprise servers and workgroup servers |
| Enterprise Server | supports all the users on the network by offering services, such as e-mail or Domain Name System (DNS). |
| Workgroup Server | a workgroup server supports a specific set of users, offering services such as word processing and file sharing, which are services only a few groups of people would need |
| Intranet | designed to be accessed by users who have access privileges to an organization's internal LAN |
| Contention | excessive collisions on Ethernet caused by too many devices, each with a great demand for the network segment |
| ARP | Address Resolution Protocol |
| Segmentation | the process of splitting a single collision domain into two or more collision domains |
| Broadcasts | All broadcasts from any host in the same broadcast domain are visible to all other hosts in the same broadcast domain. Broadcasts must be visible to all hosts in the broadcast domain in order to establish connectivity |
| bridges and switches | forward broadcast (FF-FF-FF-FF-FF) traffic, and that routers normally do not. |
| bandwidth domain | everything associated with one port on a bridge or switch, a bandwidth domain is also known as a collision domain |
| systematic steps for LAN Design | Gathering the users' requirements and expectations; Analyzing requirements; designing the Layer 1, 2, and 3 LAN structure (that is, topology); documenting the logical and physical network implementation |
| Availability | measures the usefulness of the network - Throughput; Response time; Access to resources |
| dominant network configuration in the industry | the star/extended star topology uses Ethernet 802.3 carrier sense multiple access collision detect (CSMA/CD) technology |
| Layer 1 considerations | In addition to distance limitations, you should carefully evaluate the strengths and weaknesses of various topologies, as a network is only as effective as its underlying cable |
| HCC | horizontal cross-connect |
| VCC | vertical cross-connect |
| Fast Ethernet | Ethernet that has been upgraded to 100 Mbps |
| logical diagram | the network topology model without all the detail of the exact installation path of the cabling |
| asymmetric switching | allocate bandwidth on a per-port basis, thus allowing more bandwidth to vertical cabling, uplinks, and servers |
| Layer 3 routing | determines traffic flow between unique physical network segments based on Layer 3 addressing, such as IP network and subnet |
| How scalability affects LANs | they can serve as firewalls for broadcasts. In addition, because Layer 3 addresses typically have structure, routers can provide greater scalability by dividing networks and subnets |
| How do you impose a logical structure? | Routers |
| structured Layer 1 wiring scheme | multiple physical networks are easy to create simply by patching the horizontal cabling and vertical cabling into the appropriate Layer 2 switch using patch cables |
