COURSEWORK 1

Coursework

COURSEWORK 2

Coursework

Network topologies are similar regardless of the areas of their application. Simple

topologies such as star, bus, ring, etc. were invented at the dawn of the networking

technology emergence. These topologies provided network users with the opportunity to

communicate, share files, and perform other tasks within one network. However, each

topology has its peculiarities that can be considered as disadvantages for a particular

situation. Therefore, hybrid topologies became the resolution of the emerging need in a more

sophisticated but yet reliable network topology.

Hybrid topology is the combination of bus, ring, and star topologies in order to

provide the necessary redundancy, reliability, etc. or solve any other particular issues. The

most common examples of hybrid networks are: star ring and star bus network

(Wikipedia.org, 2012a). Thus, according to Wikipedia.org (2012a), first type “consists of two

or more star topologies connected using a multistation access unit (MAU) as a centralized

hub”; the second type is the “two or more star topologies connected using a bus trunk (the

bus trunk serves as the network's backbone).”

Considering hybrid topologies, it is possible to apply old names of the simple

topologies, such as tree or snowflake, in order to describe the existing hybrid ones. Thus, tree

hybrid topology can be described as follows: it is the set of various topologies, connected

sequentially with each other. Snowflake topology is different: it is the set of various

topologies, connected to the one centralized hub (or through it).

The Internet has its own conceptual models or topologies. They are jellyfish model

and bow tie model (Wikipedia.org, 2012a). Jellyfish model is the one where pages are

strongly connected to one core while bow tie model represents the situation when there are

two cores with “In” and “Out” links (Siganos, Tauro, & Faloutsos, 2010). It is the

development of the jellyfish model.

COURSEWORK 3

References

Siganos, G., Tauro, S. L., & Faloutsos, M. (2010). Jellyfish: A Conceptual Model for the AS

Internet Topology. Retrieved from:

http://www.google.com.ua/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0C

GcQFjAC&url=http%3A%2F%2Fwww.cs.ucr.edu%2F~michalis%2FPAPERS%2FJe

llyfish-

JCN.pdf&ei=IHAVUPvIIMjOmAX1xYHADA&usg=AFQjCNGMUJq28cJTgjLpBM

8WjBiVDg3c3w

Wikipedia.org (2012a). Network topology. Retrieved from:

http://en.wikipedia.org/wiki/Network_Topology#Hybrid

Wikipedia.org (2012b). Internet topology. Retrieved from:

http://en.wikipedia.org/wiki/Internet_topology