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# ACIT 2620

## Week 2

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Objectives:

- Recap of OSI Model
- Survey of networking devices
- Overview of common network topologies
- Project setup

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## OSI Model Recap

(7) __Application__: domain specific messages
(6) __Presentation__: data formatting: encryption, compression, character encoding
(5) __Session__: organizing of messages into "visits"

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(4) __Transport__: Multiplexing, Segmentation, Re-assembly
(3) __Network__: Routing datagrams between networks, global addressing
(2) __Data-Link__: communication on shared medium
(1) __Physical__: signals across medium (bits)

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## Broadcast Domain vs Collision Domain

A broadcast domain is a group of nodes sharing the same transmission medium (i.e LAN or simply network). When these nodes are not connected through a switch (or bridge), the network constitutes a single collision domain.

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## Network Devices

Define the function and uppermost OSI layer implemented by the following devices:

- Network Interface Controller/Card
- Hub
- Bridge

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- Switch
- Router
- NAT Router
- Firewall
- Wireless Access Point (WAP)

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## Network Topologies

<ul>
<li>Bus<!-- .element: class="fragment" data-fragment-index="1" --></li>
<li>Ring<!-- .element: class="fragment" data-fragment-index="2" --></li>
<li>Star<!-- .element: class="fragment" data-fragment-index="3" --></li>
<li>Mesh<!-- .element: class="fragment" data-fragment-index="4" --></li>
<li>Hybrid<!-- .element: class="fragment" data-fragment-index="5" --></li>
</ul>

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## Reading List

- [Ethernet Fundamentals](https://learning.oreilly.com/videos/the-complete-cybersecurity/9780136173717/9780136173717-SPTT_00_08_05_00/)
- [Ethernet Basics](http://intronetworks.cs.luc.edu/current2/html/ethernet1.html)

Optional:

- [VIM basics](https://www.howtoforge.com/vim-basics)
- [A __`tcpdump`__ Tutorial with Examples](https://danielmiessler.com/study/tcpdump/)