**Introduction to Computer Networking - Exam
UNIVERSITY OF DODOMA
College of Informatics and Virtual Education
CN 121: Introduction to Networking
Test 1 – 17th May 2024
Duration: 40 Minutes
Instructions: Answer all Questions. No Additional Answer Sheets.
Multiple Choice Questions
Read each question carefully and choose the most correct response.
(0.5 Marks Each)
1. In the TCP/IP model, which layer corresponds to the OSI model’s Transport Layer?
- A. Application Layer
- B. Internet Layer
- C. Transport Layer
- D. Network Access Layer
Answer (Click to show)
C. Transport Layer
2. Which layer of the OSI model handles end-to-end communication between applications?
- A. Transport Layer
- B. Data Link Layer
- C. Application Layer
- D. Presentation Layer
Answer (Click to show)
A. Transport Layer
3. Which Ethernet standard utilizes fiber optic cables for transmission?
- A. 10BASE-T
- B. 100BASE-FX
- C. 1000BASE-T
- D. 100BASE-T
Answer (Click to show)
B. 100BASE-FX
4. What is the maximum cable length for 1000BASE-T Ethernet connections using twisted pair cables?
- A. 100 meters
- B. 500 meters
- C. 2 kilometers
- D. 10 kilometers
Answer (Click to show)
A. 100 meters
5. What is the purpose of the CSMA/CD (Carrier Sense Multiple Access with Collision Detection) protocol in Ethernet?
- A. To prevent data collisions on the network
- B. To regulate the flow of data packets
- C. To encrypt data packets for secure transmission
- D. To authenticate users before accessing the network
Answer (Click to show)
A. To prevent data collisions on the network
6. What kind of Topology is used to minimize traffic problem?
- A. Bus
- B. Mesh
- C. Star
- D. Ring
Answer (Click to show)
C. Star
7. A physical address that works at the Data Link Layer
- A. Media Access Control address
- B. Internet Protocol address
- C. Data Packets address
- D. Data Protocol address
Answer (Click to show)
A. Media Access Control address
8. The central computer in a network which data is stored, processed and shared.
- A. Firewall
- B. Intranet
- C. Hub
- D. Server
Answer (Click to show)
D. Server
9. Which of the following devices has more intelligence?
- A. NIC
- B. Router
- C. Hub
- D. Repeater
Answer (Click to show)
B. Router
10. How long will it take to transfer a 4.9152Mb file over a network running at 100 Mbps?
- A. 0.049152s
- B. 20.345s
- C. 2.0345s
- D. 0.0049152s
Answer (Click to show)
A. 0.049152s
Short Answer Questions
1. A protocol commonly used for local area networks (LANs) is called ______.
Answer (Click to show)
Ethernet
2. A layer responsible for routing and addressing in the OSI layer is ______.
Answer (Click to show)
Network Layer
3. What is the maximum length of the Ethernet data frame?
Answer (Click to show)
1518 bytes
4. The protocol that establishes the connection between the local computer and the remote computer is ______.
Answer (Click to show)
TCP (Transmission Control Protocol)
5. In CSMA/CA protocol, what is the name of the signal the device sends before it sends the actual message?
Answer (Click to show)
RTS (Request to Send)
6. A computer network is to be developed to connect 10 nodes together. How many links are required for a:
a. Fully interconnected mesh topology
Answer (Click to show)
45 links
b. Ring topology
Answer (Click to show)
10 links
7. You need to extend the distance on network segments over 1000 meter using Ethernet 10Base2 (maximum segment length is 200 meters). In order to get a better network with a cleaner signal and better performance:
a. Which device should you use?
Answer (Click to show)
Switch
b. How many of those devices are you going to use?
Answer (Click to show)
5 switches
8. What is the different between multimode and single mode fiber in terms of light source and core diameter?
Answer (Click to show)
Fiber Type Core Diameter Light Source Multi mode fiber Larger (50-62.5 µm) LED Single mode fiber Smaller (8-10 µm) Laser
Matching Questions
Match the item in Column A with its corresponding item in Column B.
(0.5 Marks Each)
Column A
- Allowing access to the data over the World Wide Web.
- Flow Control
- Uses routing tables to determine the best path for the packet and forwards it only to the intended destination.
- Operates at the physical layer of the networking standard and simply forwards data packets to all connected devices
- The network only allows one device to transmit at a time, and all devices receive broadcast transmissions.
- A kind of network only for the use of people within the company.
- The communications speed and capacity of computer networks.
- Connects two subnetworks as part of the same network.
- Network layer
- Support 10 Gbps data rate over fiber optic cable at short-range distances.
Column B
- A. 10GBASE-LR
- B. Router
- C. Ethernet
- D. HTTP
- E. FTP
- F. Repeater
- G. Switch
- H. Passive technology
- I. It determines the best path to move data from the source to the destination
- J. Bandwidth
- K. It prevents a transmitting station from surpassing a slower receiving station by controlling the processing speed.
- L. Baseband signaling
- M. 10GBASE-SR
- N. Hub
- O. Intranet
- P. MAN
- Q. Bridge
Answer (Click to show)
- D. HTTP
- K. It prevents a transmitting station from surpassing a slower receiving station by controlling the processing speed.
- B. Router
- N. Hub
- C. Ethernet
- O. Intranet
- J. Bandwidth
- Q. Bridge
- I. It determines the best path to move data from the source to the destination
- M. 10GBASE-SR
END OF TEST