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DRIVE
SPRING 2017
PROGRAM
B.SC IT
SEMESTER
SECOND
SUBJECT
CODE & NAME BT0072, Computer Networks
1 Explain the architecture of OSI model with the help of a block
diagram showing different layers of OSI model.
Answer: The layered model that dominated data
communications and networking literature before 1990 was the Open Systems
Interconnection (OSI) model. Everyone believed that the OSI model would
become the ultimate standard for data communications, but this did
2 Differentiate between analog and digital signal.
Answer: Analog and Digital Signals
One of the major functions of the physical
layer is to move data in the form of electromagnetic signals across a
transmission medium. The data usable to a person or application is not in a
3 Briefly explain Stop-and-Wait Automatic Repeat Request?
Answer: Stop-and-Wait Automatic Repeat Request
This protocol adds a simple error
control mechanism to the stop-and-wait protocol. To detect and correct
corrupted frames, we need to add redundancy bits to our data frame. When the
frame arrives at the receiver site, it is checked and if it is corrupted, it is
silently discarded. The detection of
4 Mention and explain the model on which most mailing systems are
built.
Answer: SMTP is
based on end-to-end delivery: An SMTP client contacts the destination
host's SMTP server directly, on well-known port 25, to deliver the mail. It
keeps the mail item being
5 Mention the different DNS components and explain them.
Answer: DNS components
1. The domain namespace and resource records
DNS defines a specification for a structured
namespace as an inverted tree in which each node and leaf of the tree names a
set of information. Resource records are records in the DNS database that can
be used to configure the DNS database server (such as the Start of Authority
[SOA] record) or to contain information of different types to process client
queries (such as Address [A] records or Mail Exchanger [MX] records). Typical
resource records contain
6 Mention different ways of using Authentication Header and
explain them.
Answer: Ways
of using AH
AH can be used in two ways: transport mode and tunnel mode.
AH in transport mode
In this mode,
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