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Lab 5.1: Summarization Practice
For each of the following sets of networks, determine the summary address and the mask to be used that will
summarize the subnets.
1. 192.168.1.0/24 through 192.168.12.0/24
2. 172.144.0.0 through 172.159.0.0
3. 192.168.32.0 through 192.168.63.0
4. 192.168.96.0 through 192.168.111.0
5. 66.66.0.0 through 66.66.15.0
6. 192.168.1.0 through 192.168.120.0
7. 172.16.1.0 through 172.16.7.0
8. 192.168.128.0 through 192.168.190.0
9. 53.60.96.0 through 53.60.127.0
10. 172.16.10.0 through 172.16.63.0
Review Questions
177
The following questions are designed to test your understanding of this chapter’s material. For more
information on how to get additional questions, please see
www.lammle.com/ccna
.
You can find the answers to these questions in Appendix B, “Answers to Review Questions.”
1. On a VLSM network, which mask should you use on point-to-point WAN links in order to reduce the waste
of IP addresses?
1. /27
2. /28
3. /29
4. /30
5. /31
2. In the network shown in the diagram, how many computers could be in Network B?
1. 6
2. 12
3. 14
4. 30
3. In the following diagram, in order to have IP addressing that’s as efficient as possible, which network
should use a /29 m ask?
1. A
2. B
3. C
4. D
4. To use VLSM, what capability must the routing protocols in use possess?
1. Support for multicast
2. Multiprotocol support
3. Transmission of subnet mask information
4. Support for unequal load balancing
5. What summary address would cover all the networks shown and advertise a single, efficient route to Router
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5. What summary address would cover all the networks shown and advertise a single, efficient route to Router
B that won’t advertise more networks than needed?
1. 172.16.0.0/24
2. 172.16.1.0/24
3. 172.16.0.0/24
4. 172.16.0.0/20
5. 172.16.16.0/28
6. 172.1 6.0.0/27
6. In the following diagram, what is the most likely reason the station cannot ping outside of its network?
1. The IP address is incorrect on interface E0 of the router.
2. The default gateway address is incorrect on the station.
3. The IP address on the station is incorrect.
4. The router is malfunctioning.
7. If a host is configured with an incorrect default gateway and all the other computers and router are known
to be configured correctly, which of the following statements is TRUE?
1. Host A cannot communicate with the router.
2. Host A can communicate with other hosts in the same subnet.
3. Host A can communicate with hosts in other subnets.
4. Host A can communicate with no other systems.
8. Which of the following troubleshooting steps, if completed successfully, also confirms that the other steps
will succeed as well?
1. Ping a remote computer.
2. Ping the loopback address.
3. Ping the NIC.
4. Ping the default gateway.
9. When a ping to the local host IP address fails, what can you assume?
1. The IP address of the local host is incorrect.
2. The IP address of the remote host is incorrect.
3. The NIC is not functional.
4. The IP stack has failed to initialize.
10. When a ping to the local host IP address succeeds but a ping to the default gateway IP address fails, what
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10. When a ping to the local host IP address succeeds but a ping to the default gateway IP address fails, what
can you rule out? (Choose all that apply.)
1. The IP address of the local host is incorrect.
2. The IP address of the gateway is incorrect.
3. The NIC is not functional.
4. The IP stack has failed to initialize.
11. Which of the networks in the diagram could use a /29 mask?
1. Corporate
2. LA
3. SF
4. NY
5. None
12. What network service is the most likely problem if you can ping a computer by IP address but not by
name?
1. DNS
2. DHCP
3. ARP
4. ICMP
13. When you issue the
ping
command, what protocol are you using?
1. DNS
2. DHCP
3. ARP
4. ICMP
14. Which of the following commands displays the networks traversed on a path to a network destination?
1. ping
2. traceroute
3. pingroute
4. pathroute
15. What command generated the output shown below?
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
Reply from 172.16.10.2: bytes=32 time<1ms TTL=128
1. traceroute
2. show ip route
3. ping
4. pathping
16. In the work area, match the command to its function on the right.
17. Which of the following network addresses correctly summarizes the three networks shown below
efficiently?
10.0.0.0/16
10.1.0.0/16
10.2.0.0/16
1. 10.0.0.0/15
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2. 10.1.0.0/8
3. 10.0.0.0/14
4. 10.0.0.8/16
18. What command displays the ARP table on a Cisco router?
1. show ip arp
2. traceroute
3. arp -a
4. tracert
19. What switch must be added to the
ipconfig
command on a PC to verify DNS configuration?
1. /dns
2. -dns
3. /all
4. showall
20. Which of the following is the best summarization of the following networks: 192.168.128.0 through
192.168.159.0?
1. 192.168.0.0/24
2. 192.168.128.0/16
3. 192.168.128.0/19
4. 192.168.128.0/20
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