Networks 5- Topologies Flashcards
ALL NECESSARY DONE
What are the advantages of a ~Bus~ topology?
Advantages
cost efficient, doesn’t require much cabling (no hubs/switches).
if a device fails it will be easy to install a new one.
What are the DISadvantages of a ~Bus~ topology?
Disadvantages
more workstations are connected, performance of network will become slower due to data collisions.
if the main cable breaks the whole network will fail because there are more workstations connected.
What are the advantages of a Star topology?
*easy to install
*Collisions do not happen (1) thereby avoiding the need to retransmit packets (1)
*A Star network is robust (1) as the failure of a client does not cause whole network failure (1)
*no disruption to network when adding/removing devices
*easy to troubleshoot because all data goes through the central hub which can monitor and manage the network
What are the DISadvantages of a Star topology?
*requires more cabling than other topologies which can be expensive
*if the central hub fails, all network fails
What is a bus topology?
All nodes in the network are connected directly to a central cable that runs up and down the network (cable-backbone)
What is a star topology?
All nodes are directly connected to a common central computer often referred to as a hub.
What is a MESH topology?
All nodes are connected to each other.
Typically used in WANs
What are the advantages of a MESH topology?
*no traffic problem as there are dedicated links
*fault detection is easier as there are point-to-point links
*it is more robust than other topologies, if there is a failure in one link, it doesn’t affect the others
*more secure as data travels down a dedicated line
What are the DISadvantages of a MESH topology?
*the mesh of wiring is difficult to maintain
*installation is complex and costly due to a connection between every node.
What is a TREE topology?
combination of star and bus.
Groups of star topologies are connected to a linear bus backbone cable.
What are the advantages of a TREE topology?
*supports expansion of existing networks
*network can be reconfigured to meet existing needs
*if ONE NODE FAILS, others are nOT affected
*provides hierarchical and central data arrangement of nodes
*point-to-point wiring for individual segments
What are the DISadvantages of a TREE topology?
*the bigger the network, the more difficult it is to configure
*network traffic can be heavy because data travels from central cable
*there is a limit to the length of each segment within the network that is dependent on the type of cable used
*performance can be slow
Logical vs physical
Physical is the layout of the devices on the network (the physical structure) including routers, cables etc….
Logical is how the data passes through the devices or how it acts on the network media regardless of how it is played out physically.
Logical topologies are linked to the protocols that direct the data across the network.
What is a VLAN topology?
It Is used to logically separate networks.
helps reduce time taken for transmission of data packets.
What are the advantages of a VLAN topology?
*easier to troubleshoot on smaller network
*decreased latency (travelling in smaller area)
*more security as each VLAN is a separate network within a larger overall network, therefore, sensitive info isn’t accessible by areas of the larger network
*easier to scale up/down
