Link, Network, and Transport Layers - Quiz

1.	Which of the following handles the link, network, and transport layers on a UNIX system? Please select the best answer.
	A.	The client and server processes
	B.	The portmapper process
	C.	The kernel
	D.	An HTTP client process

2.	Give two examples of link-layer protocols. Please select the best answer.
	A.	FDDI and PPP
	B.	UDP and TCP
	C.	UDP and PPP
	D.	HTTP and FTP

3.	Bill sends Jane an email. His address is 10.100.100.34. Jane's is 192.168.5.35. These are completely different subnets. Even though they are on different subnets, their router enables them to communicate, and the email is delivered. Which of the answers below best describes the routing process? Please select the best answer.
	A.	The process of establishing communication between machines at the physical-connection level, via routing tables
	B.	The process of directing packets among a choice of network paths via routing tables, based on the intended destination
	C.	The process of using RIP and routing tables in directing processes over the Internet
	D.	The process of establishing tables for network clients and servers to use for communication using routers

4.	James has just sent Subash a file over the Internet using FTP, an application-layer protocol. However, at what layer of the TCP/IP stack would James' FTP process reach the destination process for Subash's FTP server? Please select the best answer.
	A.	The data link layer
	B.	The link layer
	C.	The transport layer
	D.	The network layer

5.	What is a netmask (aka, a subnet mask)? Please select the best answer.
	A.	A separate IP address with all host bits set to zero, which determines its ability to participate on a network
	B.	The host portion of an IP address that determines its identity on a network
	C.	The network portion of an IP address that tells how it can participate on a network
	D.	A separate 32-bit number that tells the host which portion of its IP address indicates the host and which portions indicate the network

6.	In an IP network, what is the chief difference between the link layer and the network layer? Please select the best answer.
	A.	The link layer provides a language that allows clients and servers to communicate with each other, whereas the network layer directs information between IP addresses.
	B.	The link layer establishes communication between machines on the same physical segment, whereas the network layer provides addressing between different networks.
	C.	The link layer moves data between machines across different segments, whereas the network layer provides addressing between machines on the same network.
	D.	The link layer directs information between processes, whereas the network layer provides a language that allows clients and servers to communicate with each other.

7.	A standard IPv4 address is divided into four parts. For example, consider the following IP address: 192.168.4.34. To what do the four parts of an IP address correspond? Please select the best answer.
	A.	The four layers of the TCP/IP protocol stack
	B.	The type of IP address: Class A, Class B, Class C, and reserved
	C.	Each eight-bit section of the 32-bit address
	D.	Four different Internet protocols

8.	How does the transport-layer protocol add reliability to the process-level addressing capabilities? Please select the best answer.
	A.	By moving data from a serial protocol, through a modem, and across the telephone
	B.	By creating a reliable connection on top of the underlying network- and link-layer protocols
	C.	By adding routing capability to move data from one network to another
	D.	By using the loopback address to connect to the machine that originally sent a packet

Correct answers:

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