1. Group project Sept 23 Page 322, Review Questions. Explain your answers! Not just one word or letter. Write a few sentences on why/how. Question numbers 12, 13, 14, 15 Bonus Questions: 1. Describe a situation when OSPF can result in faster routing than RIP. 2. Is there ever a situation in which you would use RIP instead of OSPF? If yes, why? If no, why not?

2. Chap 7: Wrapping Up -Odds and ends Simplex, Half-Duplex, Full-Duplex Switch Security DHCP Naming -The Full Story How traffic is routed

3. Chap 7: Communication

4. Chap 7: Switch security VLANs – provide isolation Port Security – restrict which/how many MAC addresses can use the port

5. Chap 7: Dynamic Host Configuration Protocol DHCP has a “pool” of available IP address When a host starts up, it broadcasts asking for a DHCP server (why doesn't it unicast?) The server responds by giving the host an IP address, subnet mask, and default gateway(which is usually the router)

6. Chap 7: DHCP

7. Chap 7: Naming MAC address is sometimes called a “PHYSICAL ADDRESS” “Who did it PHYSICALLY come from?” “Who is it PHYSICALLY going to?” IP address is sometimes called a “LOGICAL ADDRESS” “Who did it LOGICALLY(originally) come from?” “Who is it LOGICALLY(eventually) going to?”

8. Chap 7: Naming MAC address is sometimes called a “PHYSICAL ADDRESS” “Who did it PHYSICALLY come from?” “Who is it PHYSICALLY going to?” IP address is sometimes called a “LOGICAL ADDRESS” “Who did it LOGICALLY(originally) come from?” “Who is it LOGICALLY(eventually) going to?”

9. Chap 7: The Full Story

10. Sender determines that the IP address of recipient is not on his own network (How?) Sender discovers default gateway's (a.k.a. the router) MAC address (How?) Sender sends data to the default gateway (router's MAC address, receiver's IP address)

11. Chap 7: The Full Story

12. Router receives the data, checks the frame to see if destination MAC address is the router. (it is) Router de-encapsulates and checks the packet to see if the IP address is is the router (it isn't, it's the IP address of the final destination) Router checks its routing table to see if it knows about the destination network (it does, the network is directly connected)

13. Chap 7: The Full Story

14. Chap 7: Naming MAC address is sometimes called a “PHYSICAL ADDRESS” “Who did it PHYSICALLY come from?” “Who is it PHYSICALLY going to?” IP address is sometimes called a “LOGICAL ADDRESS” “Who did it LOGICALLY(originally) come from?” “Who is it LOGICALLY(eventually) going to?”

15. Chap 7: The Full Story Router re-encapsulates data into new packet... Source MAC=Router's MAC address (which one?) Dest MAC=Receiver's MAC address Source and Dest IP addresses do not change...and forwards the packet to the receiver.

16. Chap 7: The full story

17. 5 minute break

18. Chap 7: RIP Review Rip is a DISTANCE VECTOR dynamic routing protocol. It uses HOP COUNT as its metric. (Directly connected networks have a metric of 0. Why?) Routers running RIP periodically send out their full routing table. Routing entries look like this: DESTINATION, NEXTHOP,METRIC, EXIT INTERFACE

19. Group proj 9-28 – RIP Routing table In groups of up to 5 people: Page 327 Challenge Lab 7-2 Fill in the routing tables for routers A,B,C, and D BONUS (review) QUESTIONS: 1. What are the first three bytes of a MAC address called?What purpose do they serve? 2. Why do we call each decimal-separated section of an IPv4 address in dot-decimal format an “octet”?