Computer Network Midterm Exam 2021-2022

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Questions and Answers

How many layers are present in the TCP/IP model?

  • 4 layers (correct)
  • 7 layers
  • 5 layers
  • 6 layers

What type of network operates across states, countries, or the entire globe?

  • LAN
  • MAN
  • WAN (correct)
  • PAN

Which layer in the OSI model deals with the syntax and semantics of transmitted information?

  • Transport
  • Presentation (correct)
  • Session
  • Application

Which layer is responsible for routing packets from the source to the destination in the OSI model?

<p>Network (C)</p> Signup and view all the answers

Which layers of the OSI model correspond to the Application layer in the TCP/IP model?

<p>Session, Presentation, Application (B)</p> Signup and view all the answers

Which layer of the OSI model is responsible for inter-network connectivity?

<p>Network (C)</p> Signup and view all the answers

What function is performed by the Data Link layer?

<p>Provides error detection and correction (A)</p> Signup and view all the answers

In the context of routing protocols, what type of protocol handles routing within a single autonomous system?

<p>Intra-AS Protocols (A)</p> Signup and view all the answers

Which type of communication does the transport layer protocols primarily manage?

<p>Process to process communication (D)</p> Signup and view all the answers

What are the port numbers ranging from 49,152 to 65,535 known as?

<p>Registered ports (A)</p> Signup and view all the answers

Which of the following is classified as a transport layer protocol?

<p>Stream control transmission protocol (A)</p> Signup and view all the answers

Which of the following is not classified as an application layer protocol?

<p>TCP (B)</p> Signup and view all the answers

What is the term used to describe the datagram at the application layer?

<p>Message (C)</p> Signup and view all the answers

What is the purpose of the checksum field in UDP?

<p>Detect errors over the entire user datagram (C)</p> Signup and view all the answers

Which of the following represents an architecture paradigm used in network design?

<p>Both Peer to peer and Client-server (A)</p> Signup and view all the answers

The length of a port address in TCP/IP is how many bits?

<p>16 bits (D)</p> Signup and view all the answers

The File Transfer Protocol (FTP) is built on which of the following architectures?

<p>Client server architecture (D)</p> Signup and view all the answers

Which protocol is defined as a process-to-process protocol that adds minimum information to the data?

<p>User Datagram Protocol (UDP) (B)</p> Signup and view all the answers

Which layer is responsible for delivering a message from one process to another?

<p>Transport layer (B)</p> Signup and view all the answers

Telnet protocol is used to establish a connection to which TCP port number?

<p>TCP port number 23 (A)</p> Signup and view all the answers

Which statement is true regarding E-mail as an application type?

<p>Elastic application (A)</p> Signup and view all the answers

To deliver a message to the correct application running on a host, which address must be consulted?

<p>Port address (D)</p> Signup and view all the answers

FTP is categorized under which architecture?

<p>Client-server (D)</p> Signup and view all the answers

What does FTP stand for?

<p>File Transfer Protocol (B)</p> Signup and view all the answers

Flashcards

Transport Layer Protocols

Handles communication between application processes on different hosts.

Registered Ports

Ports from 49,152 to 65,535, used for specific applications.

Stream Control Transmission Protocol (TCP)

A transport layer protocol that guarantees reliable data transfer.

UDP Checksum

A field in UDP (User Datagram Protocol) used to detect errors in the entire user datagram.

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Port Address Length (TCP/IP)

A 16-bit value used to identify specific processes or applications on a host.

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User Datagram Protocol (UDP)

A connectionless transport protocol that prioritizes speed over reliability.

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Transport Layer

The layer in the network model responsible for process-to-process communication.

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Port Address

A unique number that identifies a specific process or application on a computer.

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What does '~' indicate in a message?

The '~' symbol typically indicates the beginning of a message. It's like a signal that lets you know the message is starting.

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Application Layer Protocol

A set of rules that govern communication between applications running on different devices.

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TCP

Transmission Control Protocol, a reliable transport layer protocol that ensures data is delivered correctly.

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Message

The data being sent across the network at the application layer.

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Client-Server Architecture

A model where a central server provides services to multiple client computers.

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File Transfer Protocol (FTP)

A protocol used to transfer files between computers over a network.

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Telnet Port Number

A specific number that identifies the Telnet service on a computer.

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Elastic Application

An application that can adapt its resource usage to changes in demand.

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TCP/IP Model Layers

The TCP/IP model has four layers: Application, Transport, Internet, and Network Access. It's a simplified model for network communication.

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WAN (Wide Area Network)

A network spanning across large geographical areas like states, countries, or even the world, connecting geographically dispersed locations.

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LAN (Local Area Network)

A network confined to a single building or campus, typically used for local communication.

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OSI Model - Presentation Layer

This layer focuses on the format and meaning of data, ensuring both sender and receiver understand the information correctly.

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OSI Model - Network Layer

Deals with routing data packets from the source to the destination. It determines the path data takes across the network.

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OSI Model - Application Layer

This layer interacts directly with user applications, providing services like email, file sharing, web browsing, etc.

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OSI Model - Data Link Layer

This layer handles error detection and correction, ensuring data is transmitted accurately between two directly connected devices.

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OSI Model - Network Layer Function

The Network Layer is responsible for providing inter-network connectivity, allowing data to move across different networks.

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Study Notes

Exam Information

  • Exam title: Computer network (Trường Đại học Công nghệ Thông tin và Truyền thông Việt - Hàn)
  • Exam period: 2021-2022
  • Exam type: Midterm Exam
  • Time allowed: 60 minutes
  • Exam ID: VKU-MMT-2021

Computer Network

  • Definition: A collection of hardware components and computers interconnected by communication channels, sharing resources and information.
  • First computer network: ARPANET

OSI Model

  • Number of layers: 7
  • Host-to-host layers: Transport, Session, Presentation, Application

TCP/IP Model

  • Number of layers: 4

Network Types

  • Wide Area Network (WAN): Spans states, countries, or the whole world.
  • Local Area Network (LAN): Operates within a building or campus.

Data Units

  • Physical Layer: Bit
  • Data Link Layer: Frame
  • Transport Layer: Segment
  • Network Layer: Packet

OSI Data Unit Order

  • Data, Segment, Packet, Frame, Bit

Network Classifications

  • Scale: PAN, LAN, MAN, WAN
  • Function: Peer-to-Peer, Client-Server

Protocols

  • ARP: Resolves IP addresses to MAC addresses
  • ICMP: Used for error reporting
  • FTP: File Transfer Protocol
  • SMTP: Simple Mail Transfer Protocol
  • TCP: Connection-oriented, reliable
  • UDP: Connectionless, unreliable
  • HTTP: Used for Web pages
  • TELNET: Establishes connection between sites

Network Devices

  • Hub: Works at the Physical layer
  • Switch: Works at the Data Link layer
  • Repeater: Increases signal power
  • Router: Works at the Network layer

Data Transmission Speed Unit

  • Bit per second (bps)

Miscellaneous

  • Ping Command: Tests network reachability
  • Cyclic Redundancy Check (CRC): Error detection and correction technique
  • Transmission efficiency of protocols: ALOHA, Slotted ALOHA and CSMA
  • Maximum efficiency of Slotted ALOHA vs ALOHA: Slotted ALOHA double compared with ALOHA
  • Network address of computer: Using AND operator
  • Loopback IP address: 127.0.0.1
  • Protocols used for inter-AS routing: BGP

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