Data Communications and Computer Networks
Code: ACOE 312
Explain the term protocol and give the reasons for using layered protocols.
Mention the two disadvantages of layered protocols.
What does OSI stand for?
Using a suitable diagram list all the layers of the
Reference model and
iefly explain the functionality of each layer.
Which layer of the OSI reference model is responsible for the following:
Negotiating data transfer syntax
Addressing devices and routing through an internetwork
Flow control, acknowledgem
Coordinating communications between systems
Synchronizing sending and receiving applications
Dividing the transmitted bit streams into frames
Determine which route through the subnet to use
At which layer of the OSI reference model are the
A system has an n
layer protocol hierarchy. Applications generate messages of
bytes. At each of the layers, an h
byte header is added. What fraction
of the network bandwidth is filled
Contrast and criticize OSI and TCP reference models outlining their
similarities and differences.
Compare OSI and TCP/IP reference models with respect to
Contrast the OSI ref
erence model vs real world.
What do TCP and stand for?
What is the main difference between TCP and UDP protocols? Give an
example of a service these protocols can support?