Review Questions

1:	What are the five layers of the TCP/IP protocol suite? What is the purpose of each layer?
2:	What is the most common IP version presently in use?
3:	What is fragmentation? What fields of the IP header are used for fragmentation?
4:	What is the purpose of the TTL field in the IP header? How does the TTL process work?
5:	What is the first octet rule?
6:	How are class A, B, and C IP addresses recognized in dotted decimal? How are they recognized in binary?
7:	What is an address mask, and how does it work?
8:	What is a subnet? Why are subnets used in IP environments?
9:	Why can't a subnet of all zeros or all ones be used in a classful routing environment?
10:	What is ARP?
11:	What is proxy ARP?
12:	What is a redirect?
13:	What is the essential difference between TCP and UDP?
14:	What mechanisms does TCP use to provide connection-oriented service?
15:	Instead of ARP, Novell NetWare uses a network address that includes a device's MAC address as the host portion. Why can't IP do this?
16:	NetWare has a transport layer service similar to TCP called Sequenced Packet Exchange (SPX), but no service similar to UDP. Applications requiring connectionless service directly access the connectionless IPX at the network layer. What purpose does UDP serve by providing a connectionless service on top of what is already a connectionless service?