One time that you would not need to use a public-facing IP address is in the event that you were playing with friends who were connected to the same network as you, in that case, you would use a private IP address. In the event that you were hosting a game server that you want your friends to join, you will give your friends your public IP address to allow their computers to identify and locate your network and server in order for the connection to take place. What is a public IP address? In which scenarios/system designs, one should use it?Ī public IP address is a public-facing IP address. For example, if I am living in a hostel and I want my hostel mates to join the game server I have hosted, I will ask them to join via my server's private IP address, since the network is local to the hostel. As the name "private" suggests, the devices having the private IP addresses assigned can't be reached by the devices from any external network. Private IP addresses are assigned to the hosts in the same network to communicate with one another. What is a private IP address? In which scenarios/system designs, one should use it? These are the first address, which is reserved as a network address (a.k.a network ID), and the last address used for network broadcast. Within a given network, out of the total usable host addresses, two are always reserved for specific purposes and cannot be allocated to any host. Subnet Mask is made by setting network bits to all "1"s and setting host bits to all "0"s. Ethernet broadcasts are used to resolve IP addresses to MAC addresses (by ARP) at the data link layer.Īn Internet Protocol address (IP address) is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.An IP address serves two main functions: host or network interface identification and location addressing.Įxplain the subnet mask and give an exampleĪ Subnet mask is a 32-bit number that masks an IP address and divides the IP addresses into network addresses and host addresses. When a device sends a packet to the broadcast MAC address (FF:FF:FF:FF:FF:FF), it is delivered to all stations on the local network. When is this MAC address used?: ff:ff:ff:ff:ff:ff If a network adapter is receiving a packet, it is comparing the packet’s destination MAC address to the adapter’s own MAC address. Packets that are sent on the ethernet are always coming from a MAC address and sent to a MAC address. What is a MAC address? What is it used for?Ī MAC address is a unique identification number or code used to identify individual devices on the network. A LAN-in contrast to a WAN (Wide Area Network), which spans a larger geographical area-is a connected network of computers in a small area, like your office, college campus, or even home. A Connection (so the content of the communication can reach the recipients)Ī set of protocols that define how two or more devices can communicate with each other.Įthernet simply refers to the most common type of Local Area Network (LAN) used today.A way to address who you want to communicate with.A common language (for the two ends to understand).Network In general, what do you need in order to communicate? □ You can add more exercises by submitting pull requests :) Read about contribution guidelines here □ If you are interested in pursuing a career as DevOps engineer, learning some of the concepts mentioned here would be useful, but you should know it's not about learning all the topics and technologies mentioned in this repository ⚠️ You can use these for preparing for an interview but most of the questions and exercises don't represent an actual interview. □ There are currently 2624 exercises and questions ℹ️ This repo contains questions and exercises on various technical topics, sometimes related to DevOps and SRE
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