Chapter Review Questions


You can find the answers to the following questions in Appendix A, "Answers to Chapter Review Questions."

1:

PC1 sits on an Ethernet and uses IP address 130.1.1.1. PC1 needs to send a packet to an FTP server whose IP address is 19.1.1.1. To what IP address should PC1 forward the IP packet next?

2:

Imagine that PC1, with IP address 130.1.1.1, needs to send a packet. PC1 decides to send the packet to its default router, at IP address 130.1.1.2. PC1 has never sent a packet to that router. Two messages must flow over the network before PC1 can forward the packet. Identify the acronym for the protocol that defines those two messages, and state what the letters in the acronym stand for.

3:

Imagine that PC1, with IP address 130.1.1.1, needs to send a packet to its default router at IP address 130.1.1.2. Both PC1 and the router are attached to the same Ethernet switch, along with PCs Larry, Moe, and Curly. PC1 doesn't know the router's Ethernet MAC address. Name the message that PC1 sends to try to find out the router's MAC address, and identify which of the devices on the LAN will receive the message.

4:

PC1, with IP address 130.1.1.1, needs to send a packet to Curly, at IP address 130.1.1.3. PC1's default router is the router whose IP address is 130.1.1.2. Both PCs and the router are attached to a single Ethernet switch and are in the same subnet. Describe the role of the default router for routing this packet from PC1 to Curly.

5:

PC1 (130.1.1.1) is attached to an Ethernet switch. It needs to send a packet to a web server (19.1.1.1). The IP packet is sitting in memory in PC1. Describe the process of encapsulation that is required before PC1 can transmit the bits.

6:

Refer to Figure 11-15 for this question. In the sample network, PC1 is sending a packet to PC2. Describe whose IP and MAC addresses would be contained in the Ethernet frame that passes between PC1 and R1.

Figure 11-15. Internetwork Referenced in Some of the Questions in Chapter 11


7:

Refer to Figure 11-15 for this question. In the sample network, PC1 is sending a packet to PC2. Describe whose IP and MAC addresses would be contained in the Ethernet frame that passes between R2 and PC2.

8:

Refer to Figure 11-15 for this question. In the sample network, PC1 is sending a packet to PC2. Describe the contents of the routing table entry on R1 that would be needed for R1 to forward the packet correctly.

9:

Refer to Figure 11-15 for this question. In the sample network, PC1 is sending a packet to PC2. Describe the contents of the routing table entry on R2 that would be needed for R2 to forward the packet correctly.

10:

Define the term "routing."

11:

Define the term "default gateway."

12:

Describe the differences between routing when you are not using subnetting and when you are using subnetting.

13:

Describe the logic that a host computer uses when deciding whether it needs to send a packet to its default gateway or directly to the destination host.

14:

Referring to Figure 11-15, between the time that PC1 sends the packet and PC2 receives it, many things might have changed. Explain what is the same and what is different about the transmitted data. Compare what PC1 sends versus what PC2 receives.

15:

This chapter suggests that you will find three items in a single routing table entry. What are they, and which one(s) are useful for knowing where to send the packet next?

16:

Of the three parts of a routing table entry from the previous question, which one of these parts might not always be needed? Using R2 from Figure 11-15 as a reference, describe one routing table entry where that field would not be needed in the routing table entry.




Computer Networking first-step
Computer Networking First-Step
ISBN: 1587201011
EAN: 2147483647
Year: 2004
Pages: 173
Authors: Wendell Odom

flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net