This document contains questions related to computer networks. It covers topics like network classification and goals, point-to-point subnet topologies, layered network architecture principles, early networks like ARPANET and NSFNET, the OSI model layers and protocols, connection-oriented vs connectionless networks, data link layer services and operation, dynamic channel allocation protocols, error control using Hamming codes, Ethernet frame format, ADSL components and operation, Bluetooth technology and architecture, cable characteristics and types, optical fiber systems and transmission, Ethernet cabling and topologies, modulation techniques, DNS name resolution, email systems, the web architecture, flow control types, sliding window protocols, and CRC error detection.

1. Com. Network
1. What is Computer Network? Give the Classification and goals of Computer Network.
2. What is point-to point subnet? Draw the possible topologies for point-to-point subnet.
3. Write the principles for designing the layered architecture of a network.
4. Write short notes on ARPANET, NSFNET, Internet.
5. Define layers, protocols and interfaces. Show how communication is provided to the top
layer in the layer based network.
6. Define connection oriented and connectionless networks. Explain how packets are sent in a
simple client-server interaction on a connection oriented network.
7. Name and define the services of data link layer. Show the environment of the data link layer.
Explain how data link layer works in the Internet with diagram.
8. Name and define the key assumptions for dynamic channel allocation protocol . Define
CSMA/CD protocol with algorithm.
9. What is error control? Find the transmitted code using hamming method with odd/even parity
from the given message. Correct the message if there is any error.
10. Name and define the fields of Ethernet frame format.
11. Draw a typical ADSL arrangement and explain the function of its components.
12. What is Bluetooth technology? Define the goals of Bluetooth. Explain the Bluetooth
architecture. Name five Bluetooth profile. Define different types of multiplexing.
13. Define the characteristic properties of twisted pair and coaxial cables with diagrams.
14. What are the major components of an optical system. Write the working principle of fiber
optic.
15. Define cabling and cable topologies for Ethernet
16. Write sort notes on Gigabit and Switched Ethernet, Bluetooth Technology.
17. What is Manchester and D. Manchester encoding? Given a binary code: Convert it into
differential Manchester code with timing diagram.
18. How can you define a active repeaters for optical fiber. Name the ways of connecting fiber
optic cable.
19. How DNS works? Define DNS name space with diagram.
20. What are resource records? Explain with example.
21. What is name server? Explain with example how a resolver look-up a remote name in DNS
name space.
22. Define E-mail system showing the SMTP and POP3 protocol environment.
23. Explain the architectural framework of WWW with diagram. Write the steps that occur when
a URL is selected in the browser.
24. What is flow control? Name and define different types of flow control.
25. “ In Stop-and-Wait flow control for a>1, where, a- propagation time; 1- transmission
time, the channel is always underutilized”-Justify using necessary diagram.
26. Write the basics of Sliding- Window protocol. Explain the protocol using an example
with 3-bit window.
27. What is CRC? Explain the CRC method using Modulo-2 arithmetic. Give example.
28. Name different types of modulation with necessary diagram. Explain switching techniques.

2. Computer Networks
Class Test-2
ID- Time -25 min. Marks-20
i) Find the most appropriate answers: 10
1. Which of the following layer gives guarantee of end-to-end data transmission:
a) data link layer b) transport layer c) network layer
2. When the twisted pair cable is more twisted then it reduces:
a) noise b) attenuation c) electromagnetic interference
3. In the fiber optics the transmission media is:
a) the light source b) detector c) fiber of glass d) cladding
4. The principle of fiber optics is:
a) the total internal refraction (b) the total internal reflection (c) lower index of
refraction .
5. Fibers can be connected in …… different ways a) two b) three c) four
6. In PSTN the local loop consists of (a) medium bandwidth fiber (b) coax cable (c)
twisted pair .
7. Connection between toll office to toll office consists of: (a) TP (b) coax (c) High
bandwidth fiber.
8. The technique that is used to digitize analog signal by a codec is called a) PCM b)
demodulation c) CDMA
9. The ADSL Modem is actually a
(a) digital signal processor (b) digital to analog converter (c) analog to digital converter.
10. The computer can be connected with ADSL modem over:
(a) ethernet (b) USB (c) both of them (d) either one of them.
11. Single-mode fibers are inexpensive and are widely used for shorter distances a) true b)
false
12. In multimode fibers, the core is typically ……….. microns in diameter a) 10 b) 50 c)
25
13. The fiber optic core is surrounded by a glass cladding with a hibher index of refraction
than the core a) true b) false
14. Name three different types of digital modulation a) b) c)
15. Name three different types of multiplexing a) b)
c)
16. PON stands for ………………………………………….
17 Which of the following is not the error correcting code a) CRC b) parity check c)
Hamming code
18. Manchester coding is a ………….. framing method a) bit stuffing b) byte stuffing
c) physical layer code violation.
19. Byte stuffing framing method is not in connection with a) PPP b) HDLC c) LCP
20. Which of the following flow control protocol allow multiple frame simultaneously in
the channel a) PPP b) stop and wait c) sliding window
ii) Answer any one of the following questions:
1. What is framing? Explain the following framing method with appropriate
examples: Starting and ending flag with byte stuffing. 10
2. Define the components of an optical system. Describe the working principle of
fiber optic. Explain the ways of connecting a fiber. 10