Flashcards in Networks and the internet Deck (126)
an interconnected set of devices
Physical network topology
The actual architecture of a network i.e. how its laid out
Positives of Networks
- allows sharing of data
- allows collaberative working
- good for communication
- allows sharing of resources e.g. printers, storage and scanners
- easy to backup to a central point
Drawbacks of networks
- The user can become dependent on the network (If the network stops operating then it may not be possible to access various resources)
- Efficiency of a network can be very dependent on a network manager
- It is difficult to make a network of computer secure for hackers and outside threats
- As traffic increases on a network the performance can degrade
A protocol is a set of rules relating to the communication between devices.
Transmission Control Protocol – used with IP to ensure error free transmission and package switching
Internet Protocol – used to transfer all packets across the internet between routers
receive and send electrical signals in a network.
devices which are used to connect networks. they receive data packets from one network and based on the address on the packet forward them of
devices used to connect devices on a network, they use the physical hardware MAC address to send data on to the required destination node.
identifier that is permanently added to a device by the manufacturer
connects nodes together by broadcasting a signal to all possible destinations. The correct destination will accept the signal
WAP (wireless access point)
use wireless to connect a node to a WiFi network avoiding the need for lots of physical caballing
the wires that connect a network
Coacial Copper Cables
older, slower and cheaper
Fibre Optic Cables
newer, faster and high-capacity
an arrangement where nodes are connected to a central communication channel. Each end of the backbone is connected to a terminator. Each node is passive and data is sent in one direction at a time only
Bus topology advantages
Inexpensive to set up
Devices can easily be added
Good for small networks
Bus Topology Disadvantages
Main cable is a single point of failure
Limited cable length
Performance degrades with heavy use
an arrangement where a central node or hub provides a common connection point for all other nodes.
Star Topology advantages
Easy to isolate problems
More secure is a switch is used a data is sent only to the recipient
Star topology disadvantages
Can be expensive to set up because of the length of cable required
Central device is a point of failure
an arrangement where on node is connect to two others to form and ring.
an arrangement where ever node is connected to every other node.
one device (the client) requests services from another device (the server).
all terminals have equal status and there is no powerful central server, each computer acts as both a client and a server.
advantages of Client-Server
-User IDs, passwords and access levels centrally controlled
-Backup is centralised and usually automated
-No access to other users’ files
disadvantages of Client-Server
-Can be expensive to set up and to manage
-Server is single point of failure
advantages of peer-to-peer
-cheap to set up and maintain
- easy sharing