Kamis, 30 Desember 2010

CCNA Discovery 4 Module 6 Exam Answers Version 4.0

1. A network engineer researched whether there are mechanisms available to help with the transition from an IPv4 addressing structure to IPv6. What three options did the engineer find?(Choose three.)
• A protocol translation mechanism allows communication between the IPv4 and IPv6 networks.

• A packet analyzer determines the addressing structure and converts it to the appropriate IPv4 or IPv6 scheme.
• New Core devices that support IPV6 must be purchased.
• A protocol converter changes IPv4 packets into IPv6 packets and vice versa.
• A dual-stack network design allows both IPv4 and IPv6 addressing to be used on all network devices.
• Tunneling allows IPv4 packets to be encapsulated so that they can traverse IPv6 networks and vice versa.

2. When should the command no auto-summary be used?
• with RIP version 1, to enable classless routing
• with RIP version 2, to enable classless routing
• with RIP version 1, when discontigous networks exist
• with RIP version 2, when discontigous networks exist

3. Refer to the exhibit. What must an administrator do on R3 to ensure that update packets are sent with subnet mask information?
• Add the commands:
R3(config-router)# auto-summary
R3(config-router)# no version 2
• Add the commands:
R3(config-router)# version 2
R3(config-router)# no auto-summary

• Change the network statement on R3:
R3(config)# network 10.10.4.0
• Add the command:
R3(config)# ip route 0.0.0.0 0.0.0.0 s0/0

4. What best describes a discontiguous network?
• combines several classfull networking address
• contains more than one route to a destination
• implements more than one routing protocol
• separated from the rest of the hierarchical group by another network

5. Refer to the exhibit. A company has decided to add a new workgroup. If the subnetting scheme for the network uses contiguous blocks of addresses, what subnet is assigned to WGROUP3?
• 172.16.3.12/29
• 172.16.3.16/29

• 172.16.3.20/29
• 172.16.3.24/29
• 172.16.3.32/29

6. A network administrator is using the 10.0.0.0/8 network for the company. The administrator must create a masking scheme to support 750 users at the main office and 620 users at the remote office. What mask should be assigned to the 10.0.0.0/8 network to preserve the most addresses?
• 255.255.255.0
• /19
• /20
• 255.255.252.0

• /23
• /21

7. What is another format for the IPv6 address 1080:0000:0000:0000:0000:0000:1267:01A2?
• 1080::1267:01A2
• 1080:0:0:0:0:1267:01A2

• 1080::0:1267:01A2
• 1080:::::1267.01A2

8. How many bits make up an IPv6 address?
• 32
• 48
• 64
• 128

9. After activating IPv6 traffic forwarding, configuring IPv6 addresses, and globally configure RIPng, what is the remaining step to activate RIPng?
• Enter the ipv6 router rip name command and then use network statements to activate RIPng on the interfaces.
• Enter the ipv6 router rip name command and then specify which interfaces run RIPng, which are passive, and which only receive.
• Enter the interface mode for each IPv6 interface and enable RIPng with the ipv6 rip name enable command
.
• Enter the interface mode for each IPv6 interface and enable the multicast group FF02::9, and then activate RIPng globally using the ipv6 router rip name command.
• Enter the router rip command, and then activate RIPng using the version command.
• RIPng then automatically runs on all IPv6 interfaces.

10. Refer to the exhibit. The IT management has determined that the new subnet for WGROUP3 needs to be broken down into four more subnets. What would the subnet mask be for the four newly created subnets within WGROUP3?
• 255.255.128.0
255.255.192.0
• 255.255.224.0
• 255.255.248.0
• 255.255.252.0

11. Refer to the exhibit. What is the first usable IP address that can be assigned to the WGROUP3 switch?
• 172.16.50.96/27
• 172.16.50.97/27
• 172.16.50.98/27

• 172.16.50.99/27
• 255.255.255.0

12. Refer to the exhibit. Which set of router commands is required to turn on unequal-cost load sharing so that RTRA selects the path A-B-E and the lowest cost path A-C-E to the Internet?
• RTRA(config)# router eigrp 1
RTRA(config-router)# variance 2
• RTRA(config)# router eigrp 1

RTRA(config-router)# variance 1
• RTRA(config)# router eigrp 1
RTRA(config-router)# maximum-paths 2
• RTRA(config)# router eigrp 1
RTRA(config-router)# maximum-paths 1

13. Refer to the exhibit. Assuming that the default EIGRP configuration is running on both routers, which statement is true about Router A reaching the 2.2.2.0/24 network?
• The no auto-summary command needs to be issued to disable automatic summarization.

• The network 2.2.2.0 command needs to be issued to ensure that Router A recognizes the 2.2.2.0 network.
• EIGRP supports VLSM and automatically recognizes the 2.2.2.0 network.
• EIGRP does not support VLSM; therefore it cannot be used with discontiguous networks.

14. Refer to the exhibit. The network administrator wants router RTA to send only the summarized route of 10.10.0.0/16 to RTC. Which configuration accomplishes this?
• RTA(config)# interface s0/0
RTA(config-if)# ip summary-address eigrp 101 10.10.0.0 255.255.0.0
RTA(config-if)# exit
RTA(config)# router eigrp 101
RTA(config-router)# no auto-summary
• RTA(config)# interface s0/1
RTA(config-if)# ip summary-address eigrp 101 10.10.0.0 255.255.0.0
RTA(config-if)# exit
RTA(config)# router eigrp 101
RTA(config-router)# no auto-summary

• RTA(config)# interface s0/0
RTA(config-if)# ip summary-address eigrp 101 10.10.0.0 255.255.0.0
• RTA(config)# interface s0/1
RTA(config-if)# ip summary-address eigrp 101 10.10.0.0 255.255.0.0

15. What is a good design practice when developing a hierarchical addressing scheme?
• Address the nodes in the Access Layer and work toward the Core Layer.
• Assign addresses to the Core devices before planning the addressing scheme for the server farm.
• Determine where statically configured addressing will be implemented.
• Determine what percentage of devices are wired and what percentage of devices are wireless.

16. A network administrator is asked to design a new addressing scheme for a corporate network. Presently, there are 850 users at the head office, 220 users at sales, 425 at manufacturing, and 50 at the research site. Which statement defines the correct VLSM addressing map with minimal waste using the 172.17.0.0/16 network?
• 172.17.0.0/20 head office
172.17.1.0/21 manufacturing
172.17.1.0/22 sales
172.17.3.0/26 research
• 172.17.48.0/19 head office
172.17.16.0/20 manufacturing
172.17.48.128/25 sales
172.17.48.0/26 research
• 172.17.0.0/22 head office
172.17.4.0/23 manufacturing
172.17.5.0/24 sales
172.17.6.0/26 research
• 172.17.2.0/22 head office

172.17.3.0/23 manufacturing
172.17.4.0/26 sales
172.17.4.128/25 research

17. How would the routes for networks 172.16.1.0/24, 172.16.3.0/24, and 172.16.15.0/24 be summarized?
• 172.16.0.0/20
• 172.16.0.0/21

• 172.16.0.0/22
• 172.16.0.0/24

18. What two advantages does CIDR provide to a network? (Choose two.)
• dynamic address assignment
• automatic route redistribution
• reduced routing update traffic
• easier management of summarization

• automatic summarization at classfull boundaries

19. Which statement describes MD5 authentication for neighbor authentication?
• All passwords are sent in clear text when neighbors first learn about each other.
• Only the initiating router sends its password using encrypted text when it first discovers a new router.

• All routers send their password using encrypted text only when they first learn of each other.
• All routers send their password using encrypted text each time they exchange update packets.

20. Refer to the exhibit. What are the broadcast addresses for each subnet?
• Admin – 172.16.31.0
QA – 172.16.1.127
Development – 172.16.2.255
Sales – 172.16.32.255
• Admin – 172.16.31.255
QA – 172.16.1.255
Development – 172.16.3.255
Sales – 172.16.63.255
• Admin – 172.16.31.255
QA – 172.16.1.127
Development – 172.16.3.255
Sales – 172.16.63.255
• Admin – 172.16.31.0
QA – 172.16.1.255
Development – 172.16.2.255
Sales – 172.16.32.255

21. Refer to the exhibit. The IT management is adding three VLANs to the wgroup3 switch. The current subnet will be broken down to support 14 hosts for each of the new VLANs. What will the new subnet mask be for these VLANs?
• 255.255.255.192
• 255.255.255.240
• 255.255.248.0

• 255.255.255.224
• 255.255.240.0
• 255.255.255.248

22. An administrator is configuring IPv6 on a router. The steps that have already been completed are:
1. Activate IPv6 traffic forwarding.
2. Configure IPv6 addresses.
3. Globally configure RIPng.
What is the remaining step to complete the activation of RIPng?
• Enter the ipv6 router rip name command and then use network statements to activate RIPng on the interfaces.
• Enter the ipv6 router rip name command and then specify which interfaces run RIPng, which are passive, and which only receive.
• Enter the interface mode for each IPv6 interface and enable RIPng with the ipv6 rip name enable command.

• Enter the interface mode for each IPv6 interface and enable the multicast group FF02::9, and then activate RIPng globally using the ipv6 router rip name command.
• Enter the router rip command, and then activate RIPng using the version command. RIPng then automatically runs on all IPv6 interfaces.

23. Which range includes all available networks in the 192.168.8.0/21 network?
• 192.168.8.0/24 – 192.168.14.0/24
• 192.168.8.0/24 – 192.168.15.0/24

• 192.168.8.0/24 – 192.168.16.0/24
• 192.168.8.0/24 – 192.168.17.0/24

24. Which two are best practices for creating a new IP addressing scheme for a network? (Choose two.)
• Plan and allow for significant growth.

• Assign addresses to the access layer before any other layer.
• Plan the entire addressing scheme before assigning any addresses.
• Begin with the access layer network summary addresses and work to the edge.

• Plan the addressing scheme to meet the current minimum requirement needs.
• Implement statically assigned addresses to all hosts in the distribution layer first.

25. Refer to the exhibit. Which subnet will provide sufficient addresses for the Production network with minimal waste?
• 172.16.0.192/26
• 172.16.0.192/27
• 172.16.0.224/26

• 172.16.0.160/26
• 172.16.0.144/27


26. A network designer is implementing a new network for a company. The designer is using all new Cisco equipment and has decided to select a hierarchical routing protocol for the network. The designer wishes to minimize traffic from routing updates but also needs fast routing convergence in the event of a topology change. Also, the existing IP addressing scheme requires that the selected protocol support VLSM. Which routing protocol should be chosen?
• BGP
• RIP v1
• RIP v2
• OSPF

• EIGRP

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