656 Appendix A: Answers to Review Questions
15
The network design requires 14 hosts. What network and subnet mask should be
employed?
255.255.255.240.
16
Why is network 10.0.0.0 a popular private address?
Network 10.0.0.0 provides a large amount of address space for assigning subnetted
networks and hosts. It allows for lots of scalability.
17
List three criteria for selecting a routing protocol.
Support for variable-length subnet masks (VLSM).
Interoperates with other systems and supports redistribution.
Scalable to support present and future needs.
18
What is meant by the phrases "subnetting extends to the right" and "supernetting extends
to the left"?
Subnetting extends the prefix to the right of the classful boundary, and supernetting
extends the prefix to the left of the classful boundary.
19
To what IP address class would address 127.43.2.1 belong?
The 127 address belongs to no IP address class. The 127 address is reserved for testing.
20
What is secondary addressing, and when should it be utilized?
Secondary addressing can be used when a single subnet runs out of available host
addresses.
21
How many hosts will a Class C network support with the default mask?
254.
22
What routing protocols should you avoid when using classless routing?
RIP, IGRP.
23
What protocol ensures efficient use of bandwidth during multicasting?
IGMP.
24
List five issues to consider when designing IP addressing schemes.
Determining the number of hosts required on a network, present and projected.
Determining the number of subnets for an existing network, present and projected.
Determining interoperability issues with other vendor equipment and protocols.
Determining the appropriate location for a DHCP server.
Determining the security issues that need to be addressed.
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