2024-01-26 12:01:09

UNB/Year 4/Semester 2/CS3873/2024-01-26.md

@@ -0,0 +1,28 @@
+Lecture Topic: Web Protocols
+# Encapsulation/Decapsulation
+Each layer of a network adds a header, that encapsulates the rest of the data
+When a packet is decapsulated, each layer strips away its header after it is done processing
+
+# Network Applications
+Applications are *distributed* since they involve multiple end systems that exchange dat which each other
+
+## Application Architectures
+Dictates how applications interact on a network
+- Client/Server architecture
+	- Server: An always on host which services requests from many other hosts
+		- Data is often stored on the server
+		- Data centers can be used to create powerful virtual servers
+	- Clients: Connect through to the server
+- Peer to peer architecture
+	- No always on server
+	- Arbitrary end systems directly communicate
+	- Peers request service from other peers and provide service in return to other peers
+		- Self scalability: New peers bring new service capacity as well as new service demands
+	- Peers are intermittently connected and change IP addresses (complex management)
+	- Examples include BitTorrent (P2P file sharing)
+
+# Basics of Web and HTTP
+Invented by Tim Burners-Lee
+Client Server model
+- Client is a web browser that requests and receives, and then displays web objects
+- Server is a web server that sends objects in response to