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CS610 GDB Spring 2019 Solution & Discussion

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Suppose you are working as a network administrator in a company XYZ. The company has around 50 computers and wants to connect them VIA fiber optic cable within the same building.

The company wants to ensure the cost effectiveness and fastest possible data transmission over the network. The company also wants to make sure that in case of the failure of a node, communication among other connected nodes should not be disturbed at all. Also in case of the error detection technique, the company wants to use the fastest possible transmission error detection mechanism to ensure the correctness of the received data.

You are assigned the tasks to select and implement the most suitable network topology and error detection mechanism from the following lists according to the given scenario. Justify your choice of topology and error detection technique with valid arguments.

 

Topologies:

Token Ring Topology

Mesh Topology

FDDI Topology

 

Transmission Error Detection:

Parity Checking

Checksum

CRC

 

Please read the scenario carefully before writing your comment on the said topic.

 

A concise, coherent and to the point comment is preferred over lengthy comment having irrelevant details. Comments, posted on regular Lesson's MDB or sent through email will NOT be considered in any case. Any request about such an acceptance will not be catered.

 

CS610 GDB Solution

In the give scenario, I would choose FDDI over other two topologies, as token ring is not secure and mesh isn’t also with the cost being very high. In the above given scenario the fiber optic cable with be used to connect the computer in the same building so as FDDI used fiber optic cable so we will use this topology in this scenario.

FDDI (Fiber Distributed Data Interface) is an architecture designed for high speed backbones that operate at 100Mbps, which are used to connect and extend LANs. A ring topology is used with two fiber optic cable rings. An FDDI network contains two token rings, one for possible backup in case the primary ring fails.

The advantage to FDDI is that it uses two rings for protection in case one ring breaks. When a break occurs, data is rerouted in the opposite direction using the other ring. It is also considered reliable because it uses a token passing strategy.

Cyclic redundancy check are fast but collision prone. CRCs are popular because they are simple to implement in binary hardware, easy to analyze mathematically, and particularly good at detecting common errors caused by noise in transmission channel. They are not robust to collision attack, meaning that somebody can take a given CRC and easily a second input that matches it. Checksum uses cryptographic hash functions which are preferable to CRCs.

Cs610 gdb solution

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Cs610 GDB Solution 2019

In the give scenario, I would choose FDDI over other two topologies, as token ring is not secure and mesh isn’t also with the cost being very high. In the above given scenario the fiber optic cable with be used to connect the computer in the same building so as FDDI used fiber optic cable so we will use this topology in this scenario.

FDDI (Fiber Distributed Data Interface) is an architecture designed for high speed backbones that operate at 100Mbps, which are used to connect and extend LANs. A ring topology is used with two fiber optic cable rings. An FDDI network contains two token rings, one for possible backup in case the primary ring fails.

The advantage to FDDI is that it uses two rings for protection in case one ring breaks. When a break occurs, data is rerouted in the opposite direction using the other ring. It is also considered reliable because it uses a token passing strategy.

Cyclic redundancy check are fast but collision prone. CRCs are popular because they are simple to implement in binary hardware, easy to analyze mathematically, and particularly good at detecting common errors caused by noise in transmission channel. They are not robust to collision attack, meaning that somebody can take a given CRC and easily a second input that matches it. Checksum uses cryptographic hash functions which are preferable to CRCs

Thursday, January 30, 2020
Closing Date Friday, January 31, 2020
Status Open
Question Title Graded Discussion Board (GDB)
Question Description

A company ABC wants a medium-sized network spread within the city consisting of around 100 LANs in different buildings across the city.

Every building is also divided into several different departments (segments) and all the departments should be connected to ensure real-time communication and data sharing.

The key requirements of the company are:

1.            Fast convergence of the network upon adding/removing a new network.

2.            Fastest possible delivery of data from source to destination.

As a network administrator, you are required to select the pair of required devices for the network and routing algorithm to fulfill the requirements of the company.

Devices:

Router and Bridge

Repeater and Router

Bridge and Repeater

 

Algorithms:

Distance Vector Routing Algorithm

Link State Routing

 

Justify your selection of Devices and Algorithm with solid reasons.

SOLUTION 

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