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Monday, September 7, 2015
Wednesday, September 2, 2015
Network Topologies
TOPOLOGIES
There are two types of
Local Area Network Topologies. They fall into the following categories:
·
Logical topology
·
Physical topology
Logical
Topologies
When interviewing Warren
on 25 August 2015, (DUT student) stated that:
“A logical topology is a concept in networking that
defines the architecture of the communication mechanism for all nodes in a
network. Using network equipment such as routers and switches, the logical
topology of a network can be dynamically maintained and reconfigured. Logical
topologies contrasts with physical topologies, which refer to the physical
interconnections of all devices in the network.”
A more condensed and precise definition of a logical topology is that the term logical topology refers to the way data is transmitted between nodes. A logical topology may also be called a network transport system. (Y.Xin et al. 2003: 904).
There are two most
popular logical topologies which are:
·
Broadcast (Ethernet)
·
Token Ring
Tuesday, September 1, 2015
Ethernet
Ethernet
·
Shah (2013: 2) states that the term
Ethernet refers to the family of local- area network (LAN). A local-area
network (LAN) protocol developed by Xerox Corporation in cooperation with DEC
and Intel in 1976. Ethernet uses a bus or star topology and supports data
transfer rates of 10/100/1000 Mbps. Ethernet defines the lower two layers of
the OSI Reference Model. Ethernet network operates logically as a bus but is
organised by the devices connecting to a hub in a physical star. (Type of
networks topology 2007).
·
Shah (2013: 3) The Ethernet specification
served as the basis for the IEEE 802.3 standard, which specifies the physical
and lower software layers. Ethernet uses the CSMA/CD access method to handle
simultaneous demands. Ethernet, like other local area networks, falls in a
middle ground between long-distance, low-speed networks that carry data for
hundreds or thousands of kilometres, and specialized, very high speed
interconnections that are generally limited to tens of meters.
·
Evidence given by the System Software 1
Lecturer, Mr TP Govendor (2015, pers. comm. 07 August) A host broadcasts a message to all hosts on the same
network segment. There is no order that hosts must follow to transmit data.
Messages are sent on a First In, First Out (FIFO). Ethernet is based on this
topology
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