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Book: LPI Linux Certification in a Nutshell Section: Chapter 22. Exam 102 Review Questions and Exercises
22.7 Networking Fundamentals (Topic 1.12) 22.7.1 Review Questions -
Describe how the subnet mask affects the maximum number of hosts that can be put on a TCP/IP network. -
Name the three default address classes and the subnet masks associated with them. -
The UDP protocol is said to be connectionless. Describe this concept and its consequences on applications that use UDP. -
What user command is frequently used to send ICMP messages to remote hosts in order to verify those hosts' functionality? -
Describe the contents and use of /etc/hosts. -
In what configuration file are DNS servers listed? What is intended if the local loopback address is included there on a workstation? -
Name two modes of the netstat command and the program's output in each case. -
Describe why the route command is needed for a single interface on a nonrouting workstation. -
How does traceroute determine the identities of intermediate gateways? -
Describe the advantages and consequences of implementing DHCP. -
What utility is used to configure and dial a modem prior to the creation of a PPP connection? -
What are the four authentication modes commonly used during PPP negotiations? 22.7.2 Exercises -
Examine your system's TCP/IP configuration using ifconfig eth0 or a similar command for your network interface. Are you using DHCP? What type of subnet are you running with? Is it a Class A, B, or C address? Are you using a private address? Experiment with taking the interface offline using ifconfig eth0 down and ifconfig eth0 up. -
Examine the contents of /etc/services. -
Use the dig command to locate information from DNS servers about a domain name. -
Examine your /etc/hosts file. How much name resolution is accomplished in this file manually? -
Examine your /etc/resolv.conf file. How many DNS servers do you have available? -
Execute netstat -r. How many routes are reported? What are the routes to the local network and interface for? -
Use traceroute to examine the route to a favorite web site. -
If you are using DHCP, use pump -r to release your IP address, followed by pump -R and pump -s. Does the system still function correctly on the network? -
Using a standard modem (not a WinModem), use minicom to connect to the modem and verify that it responds to the AT command. -
Execute a manual PPP connection as described in Chapter 19. Does your modem successfully connect to your Internet Service Provider? Examine /var/log/messages for information on the PPP session. | | |
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