Hello VU students here is the solution of CS610- Computer Networks GDB No.1 Spring 2019. GDB total marks 5.
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Solution for the
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GDB Idea
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.
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