Review Questions

1.	Which of the following best describes route summarization? Using only one subnet so that the network is flattened out Grouping multiple networks and advertising them as one larger network Using supernets on all access-level equipment Advertising only one of many networks for the entire enterprise or campus
2.	When can/should route summarization be used? (Choose all that apply.) Always When route tables become too large When a campus or enterprise router owns several contiguous subnets that share equal high-order bit patterns When routing protocols are capable of handling prefix length and subnet mask information When the router IOS is capable of IP classless routing (meaning that the network prefix may be any length, including 32 bits long)
3.	How should the following networks be summarized? 172.16.12.0/24 172.16.13.0/24 172.16.14.0/24 172.16.0.0/16 172.16.14.0/24 172.16.12.0/22 172.16.14.0/22
4.	Which of the following commands allows a Cisco router to forward DHCP requests to the appropriate server? ip dhcp server ip helper-address ip helper address helper-address
5.	Which of the following best describes private addressing? Network blocks set aside by IANA for networks that aren’t connected to the global Internet Network blocks that IANA doesn’t allow for commercial use Network blocks used by private industry A block of three Class B addresses allocated by IANA for anyone to use
6.	Which network is not part of IANA-allocated private address blocks? 172.31.0.0 10.0.0.0 198.162.0.0 192.168.0.0
7.	What does NAT mean, and what is it used for? Network Anonymous Transport: Used to transfer data from privately addressed hosts to the global Internet. Network Address Translation: Used to renumber a privately addressed network. Network Address Translation: Used to convert a private IP address into a registered IP address. Network Address Translation: Uses one address and then proxies connections from a private network to the global Internet.
8.	When can NAT be used? (Choose all that apply.) When application sensitivity isn’t an issue (delay) When end-to-end traceability isn’t needed After the private address blocks have been fully utilized When a network uses only private addresses When a network has both private and registered addresses
9.	Which of the following best describes DHCP? An NIC used to configure IP addresses A method of aggregating route information A dynamic addressing scheme used by IP and IPX A protocol used to configure IP hosts
10.	Which of the following best allows a host to be configured using a DHCP server in separate broadcast domains? It cannot be done. Configure an IP helper address to forward requests to the DHCP server. Configure the DHCP server to monitor broadcasts on the remote segment. Enable bridging on all routers to create a single large broadcast domain.
11.	What is the maximum number of DHCP servers that can service a single broadcast domain with dynamic addresses? None One Two Three No limit
12.	Which of the following is a valid IP version 6 node address? 1080:::::::8:800:200C:417A 1080:0:::0::8:800:200C:417A 1080:0:0:0:8:800:200C:417A FF01::101
13.	What feature is no longer supported with IP version 6 addresses? Loopback addresses Broadcast addresses Multicast addresses Unicast addresses
14.	Which of the following are valid IPX network addresses? (Choose all that apply.) 172.16.0.0 3 abcde111 1.001a.3858.1c35
15.	Network names should be which of the following? (Choose all that apply.) Secure and secret Consistent Meaningful Colorful
16.	Which of the following utilities allows you to retain consistent DNS names when using dynamic DHCP address assignment? Bind Cisco CNS Network Registrar IOS NAT
17.	When moving a server from one network to another, which of the following steps best retains the existing mappings to that server? Change the network address and change the name of the server. Change the network address and don’t change the name of the server. Don’t change the network address and change the name of the server. Don’t change the network address and don’t change the name of the server.
18.	In the Have-A-Seat case study, which tool would be used to synchronize names with dynamically assigned IP addresses? Netsys CiscoWorks Cisco CNS Network Registrar CiscoHub/Ring manager
19.	In the Have-A-Seat case study, what would be the best recommendation for the end-user computers? Have each IP address assigned administratively. Let the users assign their own IP addresses. Use the Cisco CNS Network Registrar. Use NAT.
20.	In the Willow Creek School District, Scott decides he wants to control all IP address assignment centrally. Which of the following will achieve this for him? NAT Private addressing VLSM DHCP

Answers

1.	B Route summarization allows for hierarchical network design and addressing.
2.	B, C, D Route summarization prevents large routing tables, minimizes subnet advertisements, and requires a classless routing protocol.
3.	C The answer 172.16.12.0/22 allows for a summarization of network 172.16.12.0 through 172.16.14.0 with a 24-bit mask.
4.	B To better manage and centralize network servers, IP helper addresses can be configured on Cisco routers using the ip helper-address command.
5.	A Private IP addresses are not unique to a single network or organization connected to the Internet.
6.	C The IANA-allocated private address blocks are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
7.	C NAT converts private inside addresses to public outside addresses.
8.	A, B, D, E NAT is typically used with private address blocks.
9.	D DHCP is used to dynamically assign and centrally manage IP host addresses.
10.	B Cisco routers support the ip helper-address command, allowing centralized DHCP servers.
11.	E So long as the servers do not overlap in the addresses that they assign out, there is no limit to the number of servers per broadcast domain.
12.	C IP version 6 allows for the abbreviation of zeroed fields, but only once per address can “::” be used. FF01::101 is an IP version 6 multicast address.
13.	B IP version 6 addresses no longer support broadcast addresses. The all-hosts multicast is used instead.
14.	B, C IPX network addresses are a maximum of 24 bits and are displayed in hexadecimal for ease of use.
15.	B, C Consistent and meaningful network naming practices by the network designer will minimize the learning curve for the network’s users and administrators.
16.	B The Cisco CNS Network Registrar assigns IP addresses to individual hosts based on their DNS name.
17.	B Of course, you need to map the existing name to the new address in DNS.
18.	C The Cisco CNS Network Registrar assigns IP addresses to individual hosts based on their DNS name.
19.	C The Cisco CNS Network Registrar assigns IP addresses to individual hosts for dynamic, centralized management.
20.	D DHCP assigns IP addresses to individual hosts dynamically and allows for centralized management.