Edge of the network: the host; Network Application - Client / Server (client / server) application model access network (physical medium): a wired or wireless communication link network core (Core Network): interconnected routers (or packet forwarding device) § network of networks
Network edge
End system comprising: a desktop computer, a server, a mobile computer and the like.
How will the network edge access to the core network (edge router)?
A: access network.
Access Network
Access network refers to a network system connecting the other end of the edge router.
Common access network as follows:
The DSL. Cable, of FTTH, satellite and dial-up, Ethernet, wifi, fiber.
Physical medium is divided into: the guide guiding type media and non-media type (electromagnetic waves).
Common physical media: Twisted copper pairs, coaxial cable, fiber optic, Terrestrial radio channels, satellite radio channel.
Network core
The core network of key features: Routing Forwarding +
Routing (routing): determines that the packet transmission path from source to destination
Forwarding (forwarding): the packet from the input port to the correct switch router output port
Storage transponder transmission
Before transmitting a packet switch, he must accept, store and then the entire packet is processed.
Network Topology
Topology is a term borrowed from geometry. Network topology is a network form, or in a communication network physically.
Refers to the network topology to interconnect the various devices with the physical layout of the transmission medium, i.e., in what way the network connected computers and other equipment. Given the network topology server, the connection between the workstation and each network configuration.
There are many network topology, the main star structure, a ring structure, a bus structure, distributed, tree structure, a mesh structure, a honeycomb structure.
ISP
ISP (Internet Service Provider), Internet service providers, namely the user to provide Internet access services, telecom operators and value-added information services business.
ISP is the network end-users into the Internet entrance and bridges. it includesInternet access serviceswithInternet content delivery service。
Internet structure
End system connected to the Internet through an access ISP (access ISPs): Family, company and university ISPs
ISP access must be further interconnected: Thus any two hosts can send packets to each other
A complex network of interconnected networks: economic and national policy is the main driving force of network evolution
Internet content provider ICP ( Content Provider Networks, such as: Google, Microsoft, etc.) may run its own network, and the nearest to provide services for end users, content
Grasp the significance of the network topology
Internet is the world's largest Internet network, the network topology is extremely complex, and are highly dynamic, there are a lot of issues related to research institutes or research team found that in carrying out the network topology. Please read the relevant literature search, and discuss the implementation of the significance of what network topology discovery?
A: