This project was the first of two introducing networking concepts. In this project, I answered a few quiz-like questions and wrote a couple bash scripts while learning about the OSI model, LAN and WAN networks, and TCP/UDP data transfer protocols.

• 0. OSI model

  • 0-OSI_model: Text file answering the following questions:
  • What is the OSI model?
    1. Set of specifications that network hardware manufacturers must respect
    2. The OSI model is a conceptual model that characterizes the communication functions of a telecommunication system without regard to their underlying internal structure and technology.
    3. The OSI model is a model that characterizes the communication functions of a telecommunication system with a strong regard for their underlying internal structure and technology.
  • How is the OSI model organized?
    1. Alphabetically
    2. From the lowest to the highest level
    3. Randomly

• 1. Types of network

  • 1-types_of_network: Text file answering the following questions:
  • What type of network a computer in local is connected to?
    1. Internet
    2. WAN
    3. LAN
  • What type of network could connect an office in one building to another office in a building a few streets away?
    1. Internet
    2. WAN
    3. LAN
  • What network do you use when you browse www.google.com from your smartphone (not connected to the Wifi)?
    1. Internet
    2. WAN
    3. LAN

• 2. MAC and IP address

  • 2-MAC_and_IP_address: Text file answering the following questions:
  • What is a MAC address?
    1. The name of a network interface
    2. The unique identifier of a network interface
    3. A network interface
  • What is an IP address?
    1. Is to devices connected to a network what postal address is to houses
    2. The unique identifier of a network interface
    3. Is a number that network devices use to connect to networks

• 3. UDP and TCP

  • 3-UDP_and_TCP: Text file answering the following questions (boxes refer to an image provided by ALX):
  • Which statement is correct for the TCP box:
    1. It is a protocol that is transferring data in a slow way but surely
    2. It is a protocol that is transferring data in a fast way and might loss data along in the process
  • Which statement is correct for the UDP box:
    1. It is a protocol that is transferring data in a slow way but surely
    2. It is a protocol that is transferring data in a fast way and might loss data along in the process
  • Which statement is correct for the TCP worker:
    1. Have you received boxes x, y, z?
    2. May I increase the rate at which I am sending you boxes?

• 4. TCP and UDP ports

  • 4-TCP_and_UDP_ports: Bash script that displays listening ports.
  • Only shows listening sockets.
  • Displays the PID and name of the program to which each socket belongs.

• 5. Is the host on the network

  • 5-is_the_host_on_the_network: Bash script that pings an IP address received as an argument 5 times.
  • Usage: 5-is_the_host_on_the_network {IP_ADDRESS}.