Part 3

Topics

  • Describe the need and role of addressing in a network.
  • Create and apply an addressing scheme to a network.
  • Assign and verify valid IP addresses to hosts, servers, and networking devices in a LAN environment.
  • Explain the basic uses and operation of NAT in a small network connecting to one ISP.
  • Describe and verify DNS operation.
  • Describe the operation and benefits of using private and public IP addressing.
  • Enable NAT for a small network with a single ISP and connection using SDM and verify operation using CLI and ping.
  • Configure, verify, and troubleshoot DHCP and DNS operation on a router.
  • Implement static and dynamic addressing services for hosts in a LAN environment.
  • Identify and correct IP addressing issues.

  1. You are designing a network that needs to support 55 users. You don’t plan to extend the segment beyond the current number of users. Which subnet mask would best meet your needs?
    1. 255.255.0.0
    2. 255.255.255.0
    3. 255.255.255.192
    4. 255.255.255.160
  2. You have added a new switch to your network. You want to manage it remotely, so you need to assign it an IP address. Your router that connects to the switch has an IP address of 172.16.12.33/27. Which of the following addresses can you assign to this switch?
    1. 172.16.12.33/28
    2. 172.16.12.32/27
    3. 172.16.12.33/27
    4. 172.16.12.34/27
    5. 172.16.12.35/28
    6. 172.16.12.38/28
    7. 172.16.12.63/27
  3. You are designing an IP address scheme for your brand-new remote office. The vice president of IT calls to tell you that you will be in charge of the 192.168.1.64/26 subnetwork. This supplies you with a single subnetwork with 62 hosts. You need to have at least two subnets with 14 hosts in each subnet. What custom subnet mask should you use?
    1. 255.255.255.128
    2. 255.255.255.192
    3. 255.255.255.224
    4. 255.255.255.240
    5. 255.255.255.248
  4. Identify three valid host addresses in any subnet of the 201.168.27.0 network, assuming a fixed subnet mask of 255.255.255.240. (Choose three.)
    1. 201.168.27.33
    2. 201.168.27.112
    3. 201.168.27.119
    4. 201.168.27.126
    5. 201.168.27.175
    6. 201.168.27.208
  5. You have an internal web server that has the IP address 172.16.5.9. You need to enable this server to be accessed on TCP port 80 from the Internet; what would be the best solution for this situation?
    1. Static NAT
    2. Dynamic NAT
    3. NAT Overload
    4. Standard Routing
    5. Port NAT
  6. Which of the following represent a private IP address? (Choose two.)
    1. 192.168.5.205
    2. 172.32.65.31
    3. 10.168.5.205
    4. 224.16.23.1
    Refer to Figure 3.1 for the following three questions.
    Figure 3.1. Network diagram.
    3-1.gif
  7. You have configured NAT to share a single public IP address (205.1.1.1/24) with many internal private addresses (172.30.4.0/24 network) for Internet access. Which of the following terms does the IP address at position B in Figure 3.1 represent?
    1. Inside Local
    2. Inside Global
    3. Outside Local
    4. Outside Global
  8. You have configured NAT to share a single public IP address (205.1.1.1/24) with many internal private addresses (172.30.4.0/24 network) for Internet access. Which of the following terms does the IP address at position A in Figure 3.1 represent?
    1. Inside Local
    2. Inside Global
    3. Outside Local
    4. Outside Global
  9. You have configured NAT to share a single public IP address (205.1.1.1/24) with many internal private addresses (172.30.4.0/24 network) for Internet access. Which of the following terms does the IP address at position D in Figure 3.1 represent?
    1. Inside Local
    2. Inside Global
    3. Outside Local
    4. Outside Global
  10. You have been allocated the address space 174.82.10.0/24 for the network shown in Figure 3.2. All devices in this network are required to use the same subnet mask, and all subnets are considered usable. What is the most appropriate subnet mask for the network that is shown?
    Figure 3.2. Network diagram
    3-2.gif
    .
    1. 255.255.252.0
    2. 255.255.255.0
    3. 255.255.255.128
    4. 255.255.255.192
    5. 255.255.255.224
    6. 255.255.255.240
  11. What form of NAT maps multiple private IP addresses to a single public address by using different port numbers?
    1. Static NAT
    2. Dynamic NAT
    3. Port NAT
    4. Overload
    5. Port load
  12. What two statements describe the IP address 12.51.5.65/23? (Choose two.)
    1. It is a private IP address.
    2. The subnet address is 12.51.5.0 255.255.254.0.
    3. The last usable host address is 12.51.5.254.
    4. The lowest usable host address is 12.51.4.1.
    5. The range of usable addresses is from 12.51.5.1 to 12.51.5.254.
  13. After the routers shown in Figure 3.3 have been configured, it is discovered that the hosts in the branch office network cannot access the Internet. Further testing reveals additional connectivity issues. What is the most likely solution to this problem?
    Figure 3.3. Network diagram.

    3-3.gif

    1. Change the address of the Branch router LAN interface.
    2. Change the subnet mask of the Branch router LAN interface.
    3. Change the address of the Branch router WAN interface.
    4. Change the address of the HQ router WAN interface.
    5. Change the subnet mask of the HQ router LAN interface.
    6. Change the address of the HQ router Internet interface.
    7. Change the subnet mask of the HQ router Internet interface.
  14. Which of the following statements describe the network shown in Figure 3.4? (Choose two.)
    Figure 3.4. Network diagram.
    3-4.gif
    1. There are seven collision domains.
    2. There are eight collision domains.
    3. There are nine collision domains.
    4. There are ten collision domains.
    5. There is one broadcast domain.
    6. There are two broadcast domains.
    7. There are three broadcast domains.
  15. What two statements accurately describe private IP addresses? (Choose two.)
    1. Addresses that are nonroutable
    2. Addresses that are assigned to an organization by the IANA
    3. Addresses that cannot be routed on the Internet
    4. An addressing scheme devised to conserve the public IP address space
    5. Addresses that begin with 169.253.0.0/16
  16. RFC 1918 defines the private IP address ranges. Which of the following IP addresses are considered part of these ranges? (Choose three.)
    1. 10.23.45.67
    2. 126.21.34.56
    3. 172.16.32.1
    4. 172.31.234.55
    5. 192.169.4.5
  17. You give your IT department a spreadsheet of IP addresses and their subnets. You receive a call from one of the junior techs asking what the /26 means next to the IP addresses. You tell her:
    1. It represents the number of hosts possible on that subnetwork.
    2. It represents the number of subnetworks being used.
    3. It represents the class of IP address being used.
    4. It represents the number of bits in the subnet mask that are set to 1.
  18. Which of the following protocols use both TCP and UDP ports?
    1. HTTP
    2. DNS
    3. FTP
    4. Telnet
    5. TFTP
  19. Based on Figure 3.5, what information could you assume about this IP address information? (Choose two.)
    Figure 3.5. Command prompt window.
    3-5.jpg
    1. The client is using a private address that was most likely statically assigned by a network administrator.
    2. The client is using a public address that was most likely statically assigned by a network administrator.
    3. The client does not have an assigned IP default gateway.
    4. The client is using a private address that was most likely assigned using DHCP.
    5. The client is using a public address that was most likely assigned using DHCP.
    6. The client could not contact a DHCP server and generated its own IP address.
  20. Based on the following output, what form of NAT is being used on this router?

    Pro Inside global Inside local Outside local Outside global
    tcp 71.209.254.131:1433 192.168.1.25:1433 64.12.189.217:443 64.12.189.217:443
    tcp 71.209.254.131:1434 192.168.1.25:1434 205.188.8.237:443 205.188.8.237:443
    tcp 71.209.254.131:1435 192.168.1.25:1435 205.188.248.168:443 205.188.248.168:443
    tcp 71.209.254.131:1436 192.168.1.25:1436 207.200.94.66:80 207.200.94.66:80
    tcp 71.209.254.131:1437 192.168.1.25:1437 205.188.216.1:80 205.188.216.1:80
    tcp 71.209.254.131:1438 192.168.1.25:1438 207.200.94.66:80 207.200.94.66:80
    tcp 71.209.254.131:1440 192.168.1.25:1440 64.12.174.185:80 64.12.174.185:80
    tcp 71.209.254.131:1442 192.168.1.25:1442 207.200.74.12:80 207.200.74.12:80
    tcp 71.209.254.131:1443 192.168.1.25:1443 64.12.187.25:80 64.12.187.25:80
    tcp 71.209.254.131:1444 192.168.1.25:1444 207.200.74.66:80 207.200.74.66:80
    tcp 71.209.254.131:1445 192.168.1.25:1445 209.62.180.90:80 209.62.180.90:80
    tcp 71.209.254.131:1446 192.168.1.25:1446 8.7.28.81:80 8.7.28.81:80
    tcp 71.209.254.131:1447 192.168.1.25:1447 209.62.180.90:80 209.62.180.90:80
    tcp 71.209.254.131:52811 192.168.1.26:52811 205.240.85.61:80 205.240.85.61:80
    tcp 71.209.254.131:52813 192.168.1.26:52813 205.240.85.61:80 205.240.85.61:80
    udp 71.209.254.131:1035 192.168.1.225:1035 63.236.1.135:53 63.236.1.135:53
    udp 71.209.254.131:1035 192.168.1.225:1035 64.236.1.107:53 64.236.1.107:53

    1. Static NAT
    2. Port-based NAT
    3. Dynamic NAT
    4. NAT Overload
  21. Using the following options, select the necessary IP addresses that would accurately complete the network depicted in Figure 3.6. (Choose three.)
    Figure 3.6. Network diagram.
    3-6.gif
    1. 172.30.101.98/27
    2. 172.30.101.129/27
    3. 172.30.101.163/27
    4. 172.30.100.58/27
    5. 172.30.100.65/27
    6. 172.30.100.95/27
    7. 172.30.100.97/27
    8. 205.1.1.136/30
    9. 205.1.1.138/30
    10. 205.1.1.139/30
  22. You have recently changed configuration settings on your DHCP server and network infrastructure. Some of the DHCP clients no longer have access to network resources. What would be the best option to troubleshoot this issue?
    1. Reboot the DHCP server.
    2. Use the tracert command to determine the location of the network outage.
    3. Verify the ARP cache on the clients by using the arp –a command.
    4. Issue the ipconfig /release followed by the ipconfig /renew commands from a command prompt.
  23. Which of the following are true of the DHCP Discover message? (Choose two.)
    1. It uses TCP as the transport layer protocol.
    2. It uses UDP as the transport layer protocol.
    3. It uses a reserved multicast MAC address.
    4. It uses a unicast data link and network layer address to reach the DHCP server.
    5. It uses a destination MAC address of FFFF.FFFF.FFFF.
    6. It is commonly ignored and discarded by the DHCP server.
  24. How many valid host addresses are provided in the 10.55.128.0/22 subnet?
    1. 254
    2. 255
    3. 510
    4. 512
    5. 1022
  25. What two statements describe the IP address 172.16.3.68/23? (Choose two.)
    1. It is from the subnet 172.16.3.0 255.255.254.0.
    2. The broadcast address of the subnet is 172.16.3.255.
    3. The broadcast address of the subnet is 172.16.4.255.
    4. The first valid IP address of the subnet is 172.16.2.1.
    5. The last valid IP address of the subnet is 172.16.4.254.
  26. You are a network technician at Acme, Inc. You have subnetted the 192.168.72.0 network with a /30 mask for connections between your routers. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router can use all possible subnets?
    1. 64 networks and 2 hosts
    2. 8 networks and 30 hosts
    3. 8 networks and 32 hosts
    4. 16 networks and 16 hosts
    5. 16 networks and 14 hosts
  27. You are configuring a subnet for the Acme, Inc., branch office in Beijing. You need to assign IP addresses to hosts in this subnet. You have been given the subnet mask of 255.255.255.224. Which of these IP addresses would be valid? (Choose three.)
    1. 15.234.118.63
    2. 92.11.178.93
    3. 134.178.18.56
    4. 192.168.16.87
    5. 201.45.116.159
    6. 217.63.12.192
  28. What is the most likely cause of the problem shown in Figure 3.7 given that your organization is using a private addressing scheme?
    Figure 3.7. Command prompt window.
    3-7.jpg
    1. DHCP server scope issues.
    2. The client’s default gateway should be set to 74.125.19.103.
    3. DNS server is unreachable.
    4. A routing loop.
  29. You need to assign the IP address 192.168.6.1/23 to the FastEthernet0 /0 interface of your router. Place the numbers of the following commands in the correct order below. NOTE: Not all commands will be used. You are currently at the following prompt: Router> 1 = config memory 2 = int fa0/0 3 = configure terminal 4 = enable 5 = fastethernet 0/0 6 = ip 192.168.6.1 255.255.254.0 7 = ip address 192.168.6.1 /23 8 = ip address 192.168.6.1 255.255.254.0
    1. __
    2. __
    3. __
    4. __
  30. An administrator pings the IP address 127.0.0.1 from a command prompt on a server. If he receives reply messages, what does this indicate?
    1. The server has connected successfully to a device using IP.
    2. The server has connectivity with local devices.
    3. The server can reach the Internet.
    4. TCP and UDP operations are working successfully.
    5. TCP/IP is operating on the server.
  31. AnswerKeyPart3

Topic attachments
I Attachment Action Size Date Who Comment
Gifgif 3-1.gif manage 14.8 K 2013-04-20 - 00:51 JimSkon 301
Gifgif 3-2.gif manage 9.4 K 2013-04-20 - 00:52 JimSkon 3-2
Gifgif 3-3.gif manage 22.3 K 2013-04-20 - 00:52 JimSkon 3-3
Gifgif 3-4.gif manage 11.6 K 2013-04-20 - 00:52 JimSkon 3-4
Jpgjpg 3-5.jpg manage 77.8 K 2013-04-20 - 00:52 JimSkon 3-5
Gifgif 3-6.gif manage 21.5 K 2013-04-20 - 00:53 JimSkon 3-6
Jpgjpg 3-7.jpg manage 138.5 K 2013-04-20 - 00:53 JimSkon 3-7
Topic revision: r3 - 2013-05-07 - JimSkon
 
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