IS589 Networking Concepts and Applications – Homework week 1
October 26, 2010
Ch 1: Question 13
Describe the five layers in the Internet network model and what they do.
Used by application program. It is the user’s access to the network. By using the
application software, the user defines what messages are sent over the network.
Responsible for establishing end-to-end connections, translates domain names into
numeric addresses, segments messages and detect lost messages and request that
they be resent.
Responsible for end-to-end addressing and routing, determines destination address if
Data Link Layer
Deals with message delineation, error control and network medium access control.
Is the physical connection between the sender and receiver, defines how individual
bits are formatted to be transmitted through the network. Its role is to transfer a series
of electrical, radio, or light signals through the circuit. The physical layer includes all
devices (e.g., computers, modems, and hubs) and physical
cables and satellites).
Ch 2: Question 7
Compare and contrast two-tier, three-tier, and
-tier client-server architectures. What are the technical
differences, and what advantages and disadvantages does each offer?