Summary

In this chapter, the basic elements of the OSI and TCP/IP protocol stacks have been developed. The abstract elements of the OSI architecture are realized in the four-layer TCP/IP stack supported by Solaris. In the following chapters, each of these layers will be examined in more detail.

Questions

1.	Which of the following is a valid network topology? Star Box Square Circle
2.	Which of the following is a valid network topology? Cube Angle Cross Ring
3.	What is OSI? A network protocol A framework for defining the scope of different layers of networking technology A cube network A networking software package
4.	What is the role of the Physical Layer? Defines how data is exchanged at its very basic level Defines the apparatus for transferring data, including error checking and synchronization Defines specifies operational issues, such as how networks can exchange data Specifies how individual computers are to interpret data received from the network
5.	What is the role of the Data Link Layer? Defines how data is exchanged at its very basic level Defines the apparatus for transferring data, including error checking and synchronization Defines specifies operational issues, such as how networks can exchange data Specifies how individual computers are to interpret data received from the network
6.	What is the role of the Network Layer? Defines how data is exchanged at its very basic level Defines the apparatus for transferring data, including error checking and synchronization Defines specifies operational issues, such as how networks can exchange data Specifies how individual computers are to interpret data received from the network
7.	What is the role of the Transport Layer? Defines how data is exchanged at its very basic level Defines the apparatus for transferring data, including error checking and synchronization Defines specifies operational issues, such as how networks can exchange data Specifies how individual computers are to interpret data received from the network
8.	What is the role of the Session Layer? Defines how data is exchanged at its very basic level Determines how data from different sources can be separated Specifies how different types of data are formatted Describes how high-level applications can communicate with each other
9.	What is the role of the Presentation Layer? Defines how data is exchanged at its very basic level Determines how data from different sources can be separated Specifies how different types of data are formatted Describes how high-level applications can communicate with each other
10.	What is the role of the Application Layer? Defines how data is exchanged at its very basic level Determines how data from different sources can be separated Specifies how different types of data are formatted Describes how high-level applications can communicate with each other
11.	What link speeds are not supported by Solaris? 10Base-T - 10 Mbps 100Base-T - 100 Mbps 1000Base-FX - 1Gbps 10000Base-T - 10Gbps
12.	What command is used to modify /dev/tcp settings? tcp ar netstat ndd
13.	What command is used to disable IP forwarding? ndd -forwarding 0 ndd -set /dev/ip ip_forwarding 0 ndd -set /dev/ip ip_-forwarding +0 ndd -noforward
14.	What command is used to verify the status of a network interface? netview netlook ifconfig hmelook
15.	What command is used to check the table of IP address to MAC address mappings? arp ar ndd netstat

Answers

1.	A. Star is a valid network topology.
2.	D. Ring is a valid network topology.
3.	B. OSI is a framework for defining the scope of different layers of networking technology.
4.	A. The Physical Layer defines how data is exchanged at its very basic level.
5.	B. The Data Link Layer defines the apparatus for transferring data, including error checking and synchronization.
6.	C. The Network Layer defines specifies operational issues, such as how networks can exchange data.
7.	D. The Transport Layer specifies how individual computers are to interpret data received from the network.
8.	B. The Session Layer determines how data from different sources can be separated.
9.	C. The Presentation Layer specifies how different types of data are formatted.
10.	D. The Application Layer describes how high-level applications can communicate with each other.
11.	D. 10000Base-T - 10Gbps is not currently supported.
12.	D. ndd is used to modify /dev/tcp settings.
13.	B. ndd -set /dev/ip ip_forwarding 0 disables IP forwarding.
14.	C. ifconfig is used to verify the status of a network interface.
15.	A. arp is used to check the table of IP address to MAC address mappings.