Chapter 9 : Connecting LANs
Spanning Tree
a graph in which there is no loop. In switched LAN, this means creating a topology in which each LAN can be reached from any other LAN through one path only
Backbone Networks
allows several LANs to be connected. In a backbone network, no station is directly connected to the backbone
Bus
the topology of the backbone is a bus
Star
the topology of the backbone is a star. Also known as a collapsed or switched network. It used as a distribution backbone inside a building
Connecting Remote LAN
remotes LAN is another common backbone network application. LANs can be connected using remote bridges
VLAN
Communication between switches
IEEE Standards
Configuration
Advantages
Membership
MAC Address
Port number
IP Address
Multicast address
combination
automatic configuration
semi automatic configuration
manual configuration
table maintenance
frame tagging
time division multiplexig (TDM)
802.1Q defines format of tagging. Also defines format to be used in multi switched backbone and enable using using multi vendor equipment in VLAN
cost and time reduction
creating virtual workgroup
security
Networking Devices
Hub
Bridges
Switch
Router
Gateway
a node on a network that serves as an entrance to another network
Advantages of switch are collision alimination and connecting heterogeneous devices
Two Layer
– provide many ports and allow better performance. It can be more sophisticated. Can have buffer to hold the frames for processing
Three Layer
A switch that can perform routing functions
device that operates only in the physical layer
Active
Passive
a multi-port repeater and it create connection between station in physical star topology
a connector that connect wires coming from different branches
operates at physical level which is regenerate the signal it receive and also data link level which is can check physical (MAC) address consist in the frame
a router is use when user wants to connect multiple networks and forward packets destined either for its own networks or other networks