Computer Network Fundamentals Exam 2021-2022

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Questions and Answers

What is a computer network?

A collection of software components only.

A standalone computer system.

Interconnected devices sharing information. (correct)

A group of computers without communication channels.

Which of the following networks is recognized as the first computer network?

ASAPNET

CNNET

ARPANET (correct)

NSFNET

How many layers are there in the OSI Model?

7 (correct)

Which layers of the OSI model are considered host-to-host layers?

Transport, Session, Presentation, Application Signup and view all the answers

What is NOT a defining characteristic of a computer network?

It consists only of hardware components. Signup and view all the answers

Which of the following is a purpose of computer networks?

To facilitate remote access. Signup and view all the answers

What role does the Transport layer play in the OSI model?

It manages end-to-end communication between devices. Signup and view all the answers

Which network protocol is associated with the OSI model's Application layer?

HTTP Signup and view all the answers

What action does TDMA take when an assigned time slot has no data for transmission?

Share it to other stations Signup and view all the answers

Which standard is recommended for a Wi-Fi network?

IEEE 802.11 Signup and view all the answers

Which standard is recommended for an Ethernet network?

IEEE 802.3 Signup and view all the answers

What is the purpose of the Preamble field in Ethernet frame format?

To synchronize the receiver’s clock Signup and view all the answers

What are the network address and broadcast address for the IP address 172.25.114.250/24?

172.25.114.0 & 172.25.114.255 Signup and view all the answers

What is a TCP name for a transport service access point?

port Signup and view all the answers

Extended address in frame relay networks is used to?

to increase the range of data link connection identifiers Signup and view all the answers

What is the term for an attempt to make a computer resource unavailable to its intended users?

Denial-of-service attack Signup and view all the answers

Which protocol is known for providing reliable communication?

TCP Signup and view all the answers

Which protocol provides a connection-oriented reliable service for sending messages?

TCP Signup and view all the answers

Which of the following protocols is defined in the Transport layer?

TCP and UDP Signup and view all the answers

What does the port number in a TCP connection specify?

It specifies the communication process on the two end systems Signup and view all the answers

Which layer of the OSI model does a Switch operate in?

Data link layer Signup and view all the answers

What is the typical range of Ephemeral ports?

1024 to 65535 Signup and view all the answers

What is the use of the Ping command?

To test if a device on the network is reachable Signup and view all the answers

Which command is used to manage the IP address assigned to the machine running it?

Ipconfig Signup and view all the answers

A data unit at the physical layer is known as what?

Bit Signup and view all the answers

Which layer of the OSI model functions the same as the Internet layer of the TCP/IP model?

Network Signup and view all the answers

UTP cable contains how many pairs of wires?

4 pairs Signup and view all the answers

What is the purpose of twisting the wires in twisted pair cable?

Reduce cross-talk interference Signup and view all the answers

How many segments will the network layer receive for sending a 4000-byte datagram if the MTU is 1500 bytes?

3 Signup and view all the answers

Which Boolean operator is used by a router to determine the network address from an IP address and subnet mask?

AND Signup and view all the answers

How many subnets can be organized with a class C subnet mask of 255.255.255.192?

4 Signup and view all the answers

Which of the following IP addresses are considered private?

10.10.10.1; 172.16.0.1; 192.168.1.2 Signup and view all the answers

Which server automatically assigns IP addresses to computers in the network?

DHCP Signup and view all the answers

What is the function of NAT in networking?

Translation of IP addresses Signup and view all the answers

What is the total size of an IPv6 address?

128 bits Signup and view all the answers

What is the header size of an IPv6 datagram?

40 bytes with optional header Signup and view all the answers

What is the length of the fixed-length header in an IPv6 datagram?

40 bytes Signup and view all the answers

How many 8-bit octets are in an IPv6 address?

16 Signup and view all the answers

Which statement is true regarding a routing algorithm?

It finds the shortest-cost path for data forwarding. Signup and view all the answers

What type of routing algorithm is the Dijkstra algorithm classified as?

A link-state routing algorithm Signup and view all the answers

The Bellman-Ford routing algorithm is categorized as which of the following?

A distance vector routing protocol Signup and view all the answers

According to the Dijkstra algorithm, which node is selected after the second round when starting from node u?

u, w Signup and view all the answers

Which of the following is a potential problem faced by the Dijkstra routing algorithm?

It cannot handle negative path costs. Signup and view all the answers

Which of the following statements about fragmentation in IPv6 is accurate?

Fragmentation is not allowed in IPv6. Signup and view all the answers

Study Notes

Exam Information

Exam title: Computer Network
Exam date: 2021-2022
Course: Computer network
School: University of Information Technology and Communication (Viet-Han)

Exam Content

The exam consists of 7 papers
Each paper has 60 questions.
Questions are multiple choice.
There is a database of 200 questions
The questions cover the fundamental concepts of computer networks

Topics and Questions

Computer Network: A collection of hardware components, computers interconnected by communication channels, and resources/information sharing.
First computer network: ARPANET.
Layers of OSI Model: 7 layers.
OSI model host-to-host layers: Layers 4, 5, 6, and 7 (Transport, Session, Presentation, and Application)
Layers in TCP/IP model: 4 layers.
Computer network spanning across continents/world: WAN.
Computer network within a building/campus: LAN.
OSI layer responsible for syntax/semantics of data: Presentation layer,
OSI layer determining packet routing: Network layer.
Speed of data transmission unit: bits per second.
Network type classified by scale: PAN, LAN, MAN, WAN
Network type classified by function: Peer-to-peer, Client-Server
Data unit on physical layer: Bit
Data unit on data link layer: Frame
Data unit on network layer: Packet
Data unit on transport layer: Segment
What the Ping command does?: Tests if a device on a network is reachable
Command used to manage IP assigned to a machine: Ipconfig
Which layer does Hub work in?: Physical layer.
Which layer does Switch work in?: Data link layer
Which layer does Router work in?: Network layer
Function of the Data link layer: Provides error detection and correction.
Category 5e UTP cable usage: Ethernet.
Maximum length of a UTP cable: 100 meters
Maximum length of a coaxial cable: 500 meters.
Maximum length of a fiber optic cable: 2 kilometers
Cable not affected by electromagnetic interference: Fiber optic cable.
Principle in optical fiber transmission: Total internal reflection.
Commonly used unit for measuring data transmission speed: bits per second (bps)
Omnidirectional wave types: Radio waves, Microwaves and Infrared waves
Directional properties of waves : Microwaves and Infrared waves
Characteristics of wire network vs Wifi?: Wifi network is portable, more secure, and faster while the wire network is more stable and easier to control.
Different types of wireless and wired networks: PAN (personal area network), LAN (local area network), MAN (metropolitan area network) and WAN (wide area network) along with Wired networks (ethernet cables).
Different network protocols and layers: HTTP, SMTP, FTP, IP, TCP, UDP are some network protocols of layers.
Difference between wired and wireless network : Network mobility, security, speed (Wired is faster than Wi-Fi)
Method to combine multiple signals into a single signal: Multiplexing
Method to reverse a combined signal into separate signals: Demultiplexing.
OSI model layer responsible for data error correction: Data link layer

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Description

Test your knowledge on fundamental concepts of computer networks with this comprehensive exam covering OSI and TCP/IP models, network types, and key components. This multiple-choice quiz draws from a database of 200 questions to challenge your understanding. Perfect for students at the University of Information Technology and Communication.