Network

Packet delays

• Transmission delay
• Propagation delay
• Processing delay
• Queueing delay

OSI (Open Systems Interconnection) model

• Application
• Presentation
• Session
• Transport
• Network
• Link
• Physical

Session & Cookies

Cookie	Session
Client side	Server side
Cleared by the user	Deleted when the session ends
Max of 4KB	Unlimited
Not secured, stored in plain text	Secured, encrypted