diff --git a/UNB/Year 4/Semester 2/CS3873/2024-01-24.md b/UNB/Year 4/Semester 2/CS3873/2024-01-24.md
index ace6cf7..bed74fe 100644
--- a/UNB/Year 4/Semester 2/CS3873/2024-01-24.md	
+++ b/UNB/Year 4/Semester 2/CS3873/2024-01-24.md	
@@ -42,4 +42,20 @@ Also called TCP/IP model
 - WiFi
 ## Physical
 - Moving individual bits from one node to the next
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+
+Terms:
+- Router (Operates on network layer)
+- Switch (Operates on link layer)
+- Modem (Modulation, converting mediums and modes)
+- Access Point (WiFi access)
+
+## Protocols
+Define how peers communicate and exchange information over the network including rules, procedures, and message formats
+
+Application layer protocols:
+- Web server to web client (HTTP)
+
+(More examples for each layer in slides)
+
+### Encapsulation
+Messages get passed down between each layer, and information gets appended to the header that gets delivered as the payload
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