Page 138 - Computer_Science_F5

While the OSI model might appear as learning and understanding network
the foundational blueprint, the reality is communication fundamentals.
that the TCP/IP came first. Developed (c) Flexibility and adaptability: The TCP/
by the US Department of Defense IP model is designed to be flexible Chapter Three: Advanced Computer Networks
(DoD), TCP/IP established a simpler and adaptable to accommodate
FOR ONLINE READING ONLY
approach to network communication. new technologies and protocols.
This is evident in the way it combines
several layers from the OSI model: This allows for easier integration
of emerging technologies without
Merged application layer: Layers 5, significant changes to the core model.
6, and 7 of OSI are consolidated into a (d) Efficient data delivery: The TCP/
single application layer in TCP/IP. IP model prioritizes efficient data

Network access layer with a twist: Layers delivery through protocols like
1 and 2 of OSI are combined into TCP, which offers reliable data
a network access layer in TCP/IP. transmission with error correction
However, a key difference exists here, and flow control mechanisms.
unlike the OSI model, TCP/IP does not
handle sequencing and acknowledgment Disadvantages of the TCP/IP model
functions within this network access layer. (a) Limited scope: Similar to the OSI
Instead, it delegates these responsibilities model, TCP/IP primarily focuses
to the separate transport layer. This revised on data communication and doesn’t
version highlights the “predating” aspect of explicitly address aspects like
TCP/IP and emphasises the key difference security, network management, or
in the network access layer’s functionalities. application services.
(b) Less emphasis on
Advantages of the TCP/IP model interoperability: While widely
(a) Practical and widely used: Unlike the adopted, the TCP/IP model doesn’t
OSI model, TCP/IP is a functional have the same level of emphasis on
model that directly corresponds strict interoperability compared to the
to real-world network protocol OSI model. This can sometimes lead to
implementations like TCP, UDP, and compatibility issues between network
IP. This makes it a practical tool for devices from different vendors.
network engineers and application (c) Potential for complexity: Although
developers. simpler than the OSI model, the
(b) Simpler structure: The TCP/IP functionalities within some TCP/IP,
model uses a four-layer (sometimes layers, like the Internet layer, can be
five) structure, which is easier to quite complex, requiring a deeper
grasp compared to the seven layers understanding of advanced network
of the OSI model. This simplifies configuration.

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Student’s Book Form Five

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