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Data Communication and Network System, Schemes and Mind Maps of Data Communication Systems and Computer Networks

Daffodil International UniversityData Communication Systems and Computer Networks

Home Work 1, Complete the homework of chapter 1. It might help you so much.

Typology: Schemes and Mind Maps

2022/2023

Uploaded on 10/05/2023

irfan-sadik
irfan-sadik 🇧🇩

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Chapter # 1
1. Why are protocols needed?
2. Why are standards needed?
3. Assume six devices are arranged in a mesh topology. How many cables are needed?
How many ports are needed for each device?
4. For each of the following four networks, calculate the number of cables and discuss the
consequences if a connection fails.
a. Five devices arranged in a mesh topology
b. Five devices arranged in a star topology (not counting the hub)
c. Five devices arranged in a bus topology
d. Five devices arranged in a ring topology
5. You have two computers connected by an Ethernet hub at home. Is this a LAN, a MAN, or
a WAN? Explain your reason.
6. Draw a hybrid topology with a star backbone and three ring networks.
7. Draw a hybrid topology with a ring backbone and two bus networks.
8. Performance is inversely related to delay. When you use the Internet, which of the
following applications are more sensitive to delay?
a. Sending an e-mail
b. Copying a file
c. Surfing the Internet
9. When a party makes a local telephone call to another party, is this a point-to-point or
multipoint connection? Explain your answer.
10. Compare the telephone network and the Internet. What are the similarities? What are
the differences?
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Chapter # 1

  1. Why are protocols needed?
  2. Why are standards needed?
  3. Assume six devices are arranged in a mesh topology. How many cables are needed? How many ports are needed for each device?
  4. For each of the following four networks, calculate the number of cables and discuss the consequences if a connection fails. a. Five devices arranged in a mesh topology b. Five devices arranged in a star topology (not counting the hub) c. Five devices arranged in a bus topology d. Five devices arranged in a ring topology
  5. You have two computers connected by an Ethernet hub at home. Is this a LAN, a MAN, or a WAN? Explain your reason.
  6. Draw a hybrid topology with a star backbone and three ring networks.
  7. Draw a hybrid topology with a ring backbone and two bus networks.
  8. Performance is inversely related to delay. When you use the Internet, which of the following applications are more sensitive to delay? a. Sending an e-mail b. Copying a file c. Surfing the Internet
  9. When a party makes a local telephone call to another party, is this a point-to-point or multipoint connection? Explain your answer.
  10. Compare the telephone network and the Internet. What are the similarities? What are the differences?

Chapter # 2

  1. Match the following to one or more layers of the OSI model: a. Route determination b. Flow control c. Interface to transmission media d. Provides access for the end user
  2. Match the following to one or more layers of the OSI model: a. Reliable process-to-process message delivery b. Route selection c. Defines frames d. Provides user services such as e-mail and file transfer e. Transmission of bit stream across physical medium
  3. Match the following to one or more layers of the OSl model: a. Communicates directly with user's application program b. Error correction and retransmission c. Mechanical, electrical, and functional interface d. Responsibility for carrying frames between adjacent nodes
  4. Match the following to one or more layers of the OSI model: a. Format and code conversion services b. Establishes, manages, and terminates sessions c. Ensures reliable transmission of data d. Log-in and log-out procedures e. Provides independence from differences in data representation
  5. In Figure 2.22, computer A sends a message to computer D via LANl, router Rl, and LAN2. Show the contents of the packets and frames at the network and data link layer for each hop interface.
  6. In Figure 2.22, assume that the communication is between a process running at computer A with port address i and a process running at computer D with port address j. Show the contents of packets and frames at the network, data link, and transport layer for each hop.
  7. Suppose a computer sends a frame to another computer on a bus topology LAN. The physical destination address of the frame is corrupted during the transmission. What happens to the frame? How can the sender be informed about the situation?