Web Science/Part1: Foundations of the web/Internet Protocol/IP forwarding algorithm/quiz

1 Read the following article on Classless Inter-Domain Routing. Which are valid entries in a routing table?

with CIDR	without CIDR
		11.0.0.0
		12.3.1.1
		192.162.2.0
		192.162.0.0
		14.31.0.0
		14.31.0.1

2 CIDR is backward compatible

	yes
	no
	it depends on the size of the routing table
	Only for entries in the routing table that go through class A and B networks

3 A network device from a class A network receives an IP package with the destination IP address in a class B network. Which of the following is true?

	The package will be send back to the source since no routing from class A to class B networks is possible
	The package will be dropped since no routing from class A to class B networks is possible
	If a route to the network of the destination adress exists the package will be routed.
	If no route to the destination network exists the package will be send to the default route.
	If the package cannot be routed there will be a forwarding error message send to the source.

4 An IP package is sent from host A to Z. It is being routed via B, C and D. Now network D cannot forward the package. Which of the following is true?

	There will be an error send back to A. The route will be exactly via C and B.
	There will be an error send back to A. The route is not quite clear.
	A will certainly receive an error message that the package could not be forwarded.