The technician will show the disassembly operation

The technician will show the disassembly operation of Cell Phone Jammers this afternoon.
In Figure 1, assume that the network 1, network 2, 3 for the heterogeneous computer network subnets, each with different underlying communication protocols, no direct interconnection between them. Its working principle is: if you need to host S host a packet to D, then the first packet to host S split and packaged as a set of a group of IP packets, in these IP packets contain the host D, IP address, then IP packet with a local network communication protocol encapsulated within its subnet destination address (MAC address) for the router 1; When Router 1 receives the protocol data frames, stripped of its packaging, taking one IP packet to obtain the destination IP address.
Ethernet is the most popular local area data network as a L2. Ethernet using baseband transmission and CSMA / CD (Carrier Sense Multiple Access / Collision Detection) network access way for arbitration. Each Ethernet frame (MAC frame) are the source host and the host's physical address (MAC address). When the line of a host release information, you must first check which segment of the channel is idle, idle time on the broadcast MAC frame, corresponding to the destination address of the host to receive information, and return to confirm the information; if sent before the channel is occupied, the source Host waits a random time before sending. The director of Cell Phone Jammers workshop is supervising the manufacturing area of Cell Phone Jammers .
In order to increase the capacity of Ethernet, the introduction of the Ethernet network switch to each node connected to a network segment. Switch receives an Ethernet MAC frame, does not know which port should be forwarded out on the radio this frame. Issued until the corresponding frame passing through the host switch, the switch records the corresponding switch port of the host, later sent to the destination address received the MAC frame, the switch need to broadcast the MAC frame can be sent directly from the corresponding port The process is called address to the learning process. When the Ethernet is too large can lead to broadcast storms, you need to partition a network into several subnets with the structure, then use the router for each of the sub-capacity Ethernet interconnect National Cheng Kung University. The inspection report of Cell Phone Jammers needs the signature of the director of Cell Phone Jammers workshop.
Some companies recently launched the second layer switching technology with the third layer routing technology, combined with routing function switch router. Switch router receives the MAC frame is no longer broadcast the frame, but the routing table to select the appropriate output port for forwarding. IP network is the largest information network. Through the IP network, computer networking capabilities, we can work with most of the world to exchange information, and retrieval of information. IP network TCP / IP protocol will be countries, departments, institutions of local networking world-wide data network. X. 25, FR, Ethernet, DDN, ATM and other L2 data networks with different communication protocols and frame structure, and physical address with different formats, L2 data network node devices can be various types of data switches.