vault backup: 2024-01-26 10:35:31

.obsidian/workspace.json

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CCNA/1 - Networking Today/1.1 - Networks Affect our Lives.md

@@ -0,0 +1,4 @@
+- Communication easier and more accessible
+- Networking allows people to share ideas instantly and act upon them
+- News and information instantly available.
+- Physical limitations, geographical location, etc eliminated

CCNA/1 - Networking Today/1.2 - Network Components.md

@@ -0,0 +1,31 @@
+# Host Roles
+- To be a part of a global community, a device must be connected to a network connected to the internet. 
+- All devices connected to a network and participate directly in net communication are classified as hosts. Some hosts are called end-devices, some clients. The term host is refers to any device given a number for communication purposes to identify it.
+- This number is referred to as an IP ( Internet Protocol ) address, which identifies the network and host.
+- An example of a client is a browser ( Firefox, Chromium, Safari, etc ). A computer can run many types of client applications ex. a user can check email and view a web page while instant messaging and listening to an audio stream.
+
+# Peer-to-Peer ( P2P )
+- Client and server software usually run on separate devices, however one computer can be used for both roles - this is defined as a Peer-to-Peer network: a device functions as both a server and a client.
+- For example, in the figure below, a print sharing PC has a USB connection to the printer, with a network connection to the file sharing PC using a NIC. This allows the file sharing PC to print files, routing through the print sharing PC.
+![](Pasted%20image%2020240125163704.png)
+## Advantages 
+- Easy setup
+- Low complexity
+- Low cost, dedicated servers not required, and networking equipment not required
+- Can be used for simple tasks ( File transfer, print sharing )
+
+## Disadvantages
+- No central admin
+- Not secure
+- No scalability
+- Multi-use devices must dedicate resources to both client and server tasks.
+
+# End Devices
+- Each end device has an IP address
+- When communication initiated, an IP address is referenced to indicate the destination
+- End device can either be the source or destination
+
+# Intermediary Devices
+- Connect the end device to a network. 
+- Can connect multiple networks together to create an internetwork
+- Use end point IP address, with information about 

CCNA/Module Information.md

@@ -0,0 +1,10 @@
+# Objectives
+- Explain effects of networking
+- Explain how host and networking hardware functions
+- Represent and convey network topologies & representations
+- Compare network characteristics
+- Explain how LANs and WANs interconnect to the internet
+- Describe the (4) basic requirements of a reliable network
+- Explain trends in networking, and how they effect the way we interact
+- Identify threats and solutions
+- Identify employment opportunities in the field

Semester 2/Database Systems/Week 2/Week 2 Database Systems.md

@@ -76,3 +76,27 @@ AND sailors.rating=7;
 ```
 	
 ![](Pasted%20image%2020240123164006.png)
+
+# Workshop
+
+Count number of tuples in the following relations:
+1. Products
+![](Pasted%20image%2020240126101329.png)
+2. Suppliers
+![](Pasted%20image%2020240126101454.png)
+
+How many suppliers does each product have?
+Many suppliers to many products
+
+Write SQL queries which count the number of tuples in each of the following algebraic statements.
+1. The relation created by products x suppliers
+![](Pasted%20image%2020240126103004.png)
+2. The relation created by Products theta Products.SupplierID=Suppliers.SupplierID Suppliers
+![](Pasted%20image%2020240126102902.png)
+
+For each of the following write a description of the data it will retrieve and execute a single SQL statement which retrieves this data from the database
+
+1. This will return the product name of all products shipped from Manchester.
+2. This will return the same as the first, but be more efficient.
+3. This will return the city of all employees that live in the same city as a customer.
+