Routing for Interconnecting Cisco Networking Devices Part 1 (100-105) CCENT CCNA

[deanwebb]

ICND 100-105 Other Routing

1. A packet arrives at a router. What does the router examine in the packet and what action will it take based upon the results of that examination?
What part of the layer 2 header will the router modify?
What modification does the router make in the packet?

2. What is a default gateway for an IP range?

3. A PC has an IP address of 192.168.1.10. It is connected to a switch with an IP address of 192.168.1.254. A router that provides internet connectivity is connected to the switch with an IP address of 192.168.1.1. What should the default gateway for the PC be set to?

4. What are the differences between RIPv1 and RIPv2 in regards to:
*method used to send routing updates
*authentication
*classful vs. classless
*administrative distance
*max hop count
*content of routing updates

5. What routing protocols support VLSM?

6. What are some administrative advantages to using EIGRP?

7. What are some administrative advantages to using OSPF?

8. What are the default administrative distances of each of the following routing protocols?
*RIPv1
*RIPv2
*EIGRP
*OSPF
*ISIS

9. You see the following statement in the routing table:
O 10.1.2.0 /30 [110/128] via 10.1.1.1, 00:21:20, FastEthernet0

Write out in longhand what each element in the statement means.

10. What command will create a route to network 192.168.1.0/24 via 192.168.254.1 with an admin distance of 5?
What is the default admin distance of a static route?
Why would you want to configure an admin distance different from the default?

11. Route A has an administrative distance of 5. Route B has an administrative distance of 6. Which of these two routes is more trusted/reliable? Why?

12. Some idiot has entered a route to 10.1.1.0/24 out the wrong interface, 192.168.1.1. How do you remove that route? (Yes, reload and copy start run will work... how about commands that will remove the route without bouncing the router or reverting the config?)

13. Here are 2 route statements:
ip route 10.2.2.2 255.255.255.255 192.168.1.1
ip route 10.0.0.0 255.0.0.0 172.16.1.1

What interface will packets bound for 10.2.2.3 go out? What about packets for 10.2.2.2? Why?
Would it be any different if the order of the route statements were switched?
What happens to those packets if a statement "ip route 10.2.0.0 255.254.0.0 10.254.254.254" is added?

14. A user has an IP address of 10.1.1.54. He complains that he is not able to access the Internet properly. Assuming all network gear and his PC are in proper place and functioning, what would be needed to allow traffic from his PC to be routable on the Internet?

15. Assuming a company wanted to use as few routes as possible on its devices, how many routes would you expect to see on a router in a remote office with less than 50 users, assuming the router handled the local internet connection?

16. In a large company, what would be the key differences between core routers and WAN routers in terms of their routing tables?

17. You are entering routes on a router and are in config mode. Interface 1 has an IP of 10.0.1.1, interface 2 an IP of 10.0.2.1, and interface 3 an IP of 10.0.3.1. At the router(config)# prompt, what commands will you use to enter routes for:
*a default route via interface 1
*a route to 172.16.0.0/16 via interface 2
*a route to 172.17.128.0/17 via interface 2
*a route to 192.168.250.240/24 via interface 3

18. On a routing table, what codes denote where a route was learned from or if it is a static route?

19. What is route summarization?
What are advantages of route summarization?
What could be some concerns when using route summarization?

20. What is a default route?
If there is no default route, what happens to packets that do not match an entry on a router's routing table?
(Security side question... how can not having a default route to the Internet provide a security solution?)