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0x07-networking_basics

README.md

0x07. Networking basics #0

0-OSI_model

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

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

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

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

Write a Bash script that displays listening ports:

  • That only shows listening sockets
  • That shows the PID and name of the program to which each socket belongs

5-is_the_host_on_the_network

Write a Bash script that pings an IP address passed as an argument.

Requirements:

  • Accepts a string as an argument
  • Displays Usage: 5-is_the_host_on_the_network {IP_ADDRESS} if no argument passed
  • Ping the IP 5 times