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What does “OSI” stand for?

OSI stands for Open System Interconnection

List the 7 layers of the OSI model and what each one is responsible for.

The seven layers of the OSI model are: Physical, where the computer if physically connected to the network and data is sent through binary. Data link which is responsible for node to node transfer. Network layer is responsible for host to host connection. Transport layer which is responsible for application services. Session layer is in charge of maintaining sessions and also the security for those sessions. Presentation layer which is responsible for translating whatever the application is sending or receiving. Application layer which is responsible for network based programs remaining connected to the network.

Distinguish which layers are the “hardware layers”, and which layers are the “software layers”. What does that even mean?

Hardware layers are one through three while software is the rest. Hardware means where the connection of the layer requires physical connections.

How can the OSI model be used in troubleshooting?

The OSI model can be used in troubleshooting by determining whether or not the problem is coming from the source of where the internet is or if it's from your physical hardware.

What is Wireshark?

Wireshark is a packet sniffer which sits in between you and your router and reads the packets going to and coming from the internet.

What is a packet?

A packet is a snippet of information coming through a connection to be received and translated.

What 3 high-level things does Wireshark accomplish? How could these be used for nefarious purposes? For benevolent purposes?

The three high level things wireshark accomplishes is it's able to read packets, edit packets, and send out custom packets. It can be used for nefarious purposes by intercepting packets and are being able to redirect it or modify it. Benevolent purposes as it can help to troubleshoot to make sure a service is functioning as usual.

Sourcees: Layers of OSI Model What Is Wireshark and How Is It Used?