Networks Flashcards
Bus Topology
Nodes are directly connected to a linear cable or bus. A bus network has terminators no each end, makes sure the network functions properly. As the packets arrive at each node, it checks the destinations address contained in the packet. If the address of the computer system matches that contained in the packet, it processes the data otherwise it moves on.
Ring topology
In a ring network, each node connects to exactly two other nodes providing a single pathway for signals through each node. Around the ring, packets are sent, being passed from one computer system to the next until they arrive at their destination.
Star Topology
In a star topology, each computer system is connected to a central node. One more central switch, hub or computer acts as a central conduit to transmit data. Offers good security.
Mesh Topology
In a mesh topology, each computer system is connected directly to each of the others. Each node relays data for the network. All mesh nodes co-operate in the distribution of data in the network.
Router
Stores the addresses of computers on the network and transfers data between devices.
Hub
Copies all packets of data to all devices on the network.
Switch
Analyses each packet of data and sends it to the computer it was intended for.
Gateway
Joins together two networks that use a different base protocol. e.g. LAN to WAN.
Bridge
Joins two networks that use the same base protocol. e.g. LAN to LAN.
LAN
A network spanning a small site.
WAN
A network spanning a large geographical site.
Contents of a packet
The source address,
The destination address,
Information which enables the data to be reassembled into its original form,
Other tracking information,
The data itself,
A checksum that checks that the data has not been corrupted.
