1. CSC 116 Nov 9 2015

2. Administrative Required 2 nd exam will be next week on Wed  Nov 18th It will be short (10 questions) It will only cover chapters 8 and 9  Network topics (we will review on Mon Nov 16th) It will count as a class project NO SCHOOL WED NOV 11 th

3. Today Firewalls Small Office/Home Office Router setup

4. Quick Review: OSI Model Picture Credit: blog.butchevans.com

5. Encapsulation Data

6. Quick review: IP Addresses Two Types IPv4: 32-bit addresses Use “Dotted-Decimal” ( 192.168.2.3) IPv6: 128-bit addresses Use hexadecimal ( 3ffe:1900:4545:1243:2001:f8ff:fe21:67cf)

7. Quick review: Transport Layer Transmission Control Protocol Reliable and connection-oriented User Datagram Protocol Unreliable and connectionless Both work with segments, use source and destination ports, and use checksums

8. Quick review: TCP and UDP

9. Firewalls can block network traffic Block incoming or outgoing network traffic based on rules Rules are usually based on IP addresses or ports Can be network-based or host-based Can be default-permit or default-deny

10. Windows firewall prompt

11. Barracuda Networks Firewall

12. Small Office/Home Office Router Image source: newegg.com

13. Setting up a SOHO router

14. SOHO router is many devices in one Router : routes traffic between local network and ISP network Switch: Allows multiple devices to be connected by connecting cables Wireless Access Point: Allows multiple devices to be connected over WiFi DHCP server: Assigns IP addresses to devices on the local network Firewall: Blocks certain traffic based on IP addresses and ports

15. Typical Setup Plug internet into WAN port, plug computers into LAN ports Configure router through web interface  Usually something like 192.168.1.1 Consult your documentation  It may ask for a username and password Consult your documentation Change the password to log in Change the WiFi SSID and password

16. WiFi Security Open – Might be ok in some situations WPA2 – Always use this if you can Hidden SSID – Adds some security by requiring people to type in the SSID before they can connect  Provides weak security MAC Address filtereing – Allow only known physical devices to connect to your network  Provides weak security