Chapter 10

10.1.5 1 - When implementing a Multiprotocol Label Switching (MPLS) WAN, which data unit is managed by the routers at different sites? PACKETS 2 - Which of the following is true of Multiprotocol Label Switching? MPLS can carry ATM, SONET, and Ethernet traffic. AND CEF is required for all MPLS-enabled Cisco routers. 3 - Which VSAT component provides data transmission capabilities over a satellite link? BLOCK UPCONVERTER (BUC) 4 - Which of the following describe the channels and data transfer rates used for ISDN BRI? One channel operating at 16 Kbps AND Two channels operating at 64 Kbps each 5 - Which of the following services are available regardless of whether the telephone company network is available? CABLE MODEM 6 - Which WAN connection types use digital communications over POTS? ISDN AND DSL 7 - Connects multiple network locations to each other via WAN links. Each location has a direct link to all other locations. correct answer: Full mesh Connects multiple remote networks via WAN links. One site is the main location. correct answer: Hub and spoke A single, pre-established path from one network location, through a carrier network, and to a remote network location. correct answer: Point-to-point Provides two separate physical connects to a single ISP. correct answer: Dual-homed

A network connected to an ISP using a single line. correct answer: Single-homed 8 - Which switching network type allows data connections that can be initiated when needed and terminated when communication is complete? CIRCUIT 9 - Which of the following is an example of a public WAN? CABLE INTERNET 10 - Which cellular network type can, theoretically, provide speeds up to 10Gbps? 5G 10.2.4 Required Actions & Questions Remove the shutdown from the SFO s0/1/0 interface Remove the shutdown from the LAX s0/1/1 interface Add the clock rate Q1What is the status of the Serial interface on each router? Why? Your answer: Correct answer: The status of the interfaces on both routers is administratively down. This indicates that the interfaces were shut down. Q2After removing shutdown from both interfaces, how did the status change? Your answer: Correct answer: Both interfaces are down, line protocol is down. Q3Which cable type is connected to the SFO router? Your answer: Correct answer: The entry DTE V.35 indicates a DTE cable is connected to the SFO router. Q4Did the s0/1/0 interface status change? Your answer: Correct answer: No, setting the clock rate on the SFO router does not affect the interface status because the clock rate is set on the DCE device. Q5Why isn't the clock rate set in the configuration file? Your answer: Correct answer: The clock rate is not actually set for the interface because it is a DTE interface. Q6How did the status of both interfaces change? Your answer: Correct answer: Setting the clock rate changes the status to Serial0/1/0 is up, line protocol is up. Q7What is the encapsulation type set on each interface? Your answer: Correct answer: HDLC Q8What effect does the IP address have on the interface status? Correct answer: Neither interface has an IP address assigned. Q9How did the status change?

a. At the SFO# prompt, type show controllers s0/1/0 and press Enter . b. Answer Question 3. 4. Set the clock rate on SFO. a. At the SFO# prompt, type conf t and press Enter . b. At the SFO(config)# prompt, type int s0/1/0 and press Enter . c. At the SFO(config-if)# prompt, type clock rate 9600 and press Enter to configure the clock rate on the Serial0/1/0 interface. d. Press Ctrl + Z . e. At the SFO# prompt, type show interfaces and press Enter . f. Answer Question 4. 5. View the running-config on SFO. a. At the SFO# prompt, type show running-config and press Enter . b. Answer Question 5. 6. Set the clock rate on LAX. a. At the LAX# prompt, type conf t and press Enter . b. At the LAX(config)# prompt, type int s0/1/1 and press Enter . c. At the LAX(config-if)# prompt, type clock rate 9600 and press Enter to configure the clock rate on the Serial0/1/0 interface. 7. Use the show interfaces command on both router. a. Press Ctrl + Z . b. At the LAX# prompt, type show interfaces and press Enter . c. At the SFO# prompt, type show interfaces and press Enter . d. Answer Questions 6-7. 8. Use the show ip interface command on both router. a. At the SFO# prompt, type show ip interface and press Enter . b. At the LAX# prompt, type show ip interface and press Enter . c. Answer Question 8. 9. Change the encapsulation to PPP on SFO. a. At the SFO# prompt, type conf t and press Enter . b. At the SFO(config)# prompt, type int s0/1/0 and press Enter . c. At the SFO(config-if)# prompt, type encapsulation ppp and press Enter . d. Press Ctrl + Z . e. At the SFO# prompt, type show interfaces and press Enter . f. Answer Question 9. g. At the SFO# prompt, type conf t and press Enter . h. At the SFO(config)# prompt, type int s0/1/0 and press Enter . i. At the SFO(config-if)# prompt, type encapsulation hdlc and press Enter . 10.2.7 In this lab, your task is to:  Assign an IP address to each serial interface. Use the seventh subnet on network 192.168.2.0 using a 30-bit mask: o For S0/0/0 on RouterA, assign the first address on the subnet.

o For S0/0/1 on RouterB, assign the last address on the subnet.  Use the show controllers command to identify the DCE device.  On the DCE interface, configure a clock rate of 9600 using the clock rate command.  Bring both interfaces up using the no shutdown command.  Save the changes on both routers. Complete this lab as follows: 1. Find the DCE interface. a. Select RouterA . b. Press Enter to get started. c. At the RouterA> prompt, type show controllers s0/0/0 and press Enter . d. Select RouterB . e. Press Enter to get started. f. At the RouterB> prompt, type show controllers s0/0/1 and press Enter . RouterB has the DCE interface. 2. Configure RouterB. a. At the RouterB> prompt, type enable and press Enter . b. At the RouterB# prompt, type config t and press Enter . c. At the RouterB(config)# prompt, type interface s0/0/1 and press Enter . d. At the RouterB(config-if)# prompt, type ip address 192.168.2.26 255.255.255.252 and press Enter . e. At the RouterB(config-if)# prompt, type clock rate 9600 and press Enter . f. At the RouterB(config-if)# prompt, type no shutdown and press Enter . g. Press Ctrl + Z . h. At the RouterB# prompt, type copy run start and press Enter . i. Press Enter to begin building the configuration. 3. Configure RouterA. a. At the RouterA> prompt, type enable and press Enter . b. At the RouterA# prompt, type config t and press Enter . c. At the RouterA(config)# prompt, type interface s0/0/0 and press Enter . d. At the RouterA(config-if)# prompt, type ip address 192.168.2.25 255.255.255.252 and press Enter . e. At the RouterA(config-if)# prompt, type no shutdown and press Enter . f. Press Ctrl + Z . g. At the RouterA# prompt, type copy run start and press Enter . h. Press Enter to begin building the configuration. 10.2.8 1 - Which is the default Layer 2 encapsulation method for serial interfaces on a Cisco router? HDLC 2 - Connects the WIC in the router to the telecom equipment.

7 - You are troubleshooting problems with a serial interface on a router that is connected to a leased line WAN interface. You need to view the type of serial cable that has been used on the s0/0/1 interface and which end of the cable is connected to the DCE or DTE. Which command should you use to do this? sh controllers s0/0/1 8 - You need to assign an interface on the router with the IP address 192.168.1.250 and subnet mask of 255.255.255.0. Which command will accomplish this task? ip address 192.168.1.250 255.255.255.0 9 - What is the router that provides clocking when connecting two routers in a back-to-back configuration through their serial ports called? DCE 10 - Which command will allow you to see a consolidated message about each IP interface? sh ip int brief 10.3.4 In this lab, your task is to:  Designate both FastEthernet interfaces as inside NAT interfaces.  Configure the Serial0/0/0 interface as an outside NAT interface.  Create a standard access list number 50 that allows both inside networks. o Fa0/0 is on network 192.168.1.0/24 , and Fa0/1 is on network 192.168.2.0/24 . o With the access-list command, use a wildcard mask of 0.0.0.255 .  Create a NAT pool named my_addrs identifying the six addresses. o With the ip nat pool command, identify the first and last addresses in the range that can be used for NAT. o Use the netmask parameter to configure the addresses using a 29-bit mask. o A 29-bit mask has the binary form of 255.255.255.248. You will use this value with the netmask parameter of ip nat pool command.  Use the ip nat inside source command to link the access list with the address pool. o Use the list parameter to identify the access list number. o Use the pool parameter to identify the address pool name (my_addrs). o Use the overload parameter so that all the private clients have simultaneous access and are not limited to the number of outside addresses. Without this parameter, only six inside clients have internet access at a time.  Save your changes to the startup-config file.

Complete this lab as follows: 1. Select Fiji . 2. Press Enter to get started. 3. At the Fiji> prompt, type enable and press Enter . 4. At the Fiji# prompt, type config t and press Enter . 5. At the Fiji(config)# prompt, type interface fa0/0 and press Enter . 6. At the Fiji(config-if)# prompt, type ip nat inside and press Enter . 7. At the Fiji(config-if)# prompt, type interface fa0/1 and press Enter . 8. At the Fiji(config-if)# prompt, type ip nat inside and press Enter . 9. At the Fiji(config-if)# prompt, type interface s0/0/0 and press Enter . 10. At the Fiji(config-if)# prompt, type ip nat outside and press Enter . 11. At the Fiji(config-if)# prompt, type access-list 50 permit 192.168.1.0 0.0.0.255 and press Enter . 12. At the Fiji(config)# prompt, type access-list 50 permit 192.168.2.0 0.0.0.255 and press Enter . 13. At the Fiji(config)# prompt, type ip nat pool my_addrs 70.0.0.64 70.0.0.69 netmask 255.255.255.248 and press Enter . 14. At the Fiji(config)# prompt, type ip nat inside source list 50 pool my_addrs overload and press Enter . 15. Press Ctrl + Z . 16. At the Fiji# prompt, type copy run start and press Enter . 17. Press Enter to begin building the configuration. 10.3.6 In this lab, your task is to:  Configure Fa0/0 interface as an inside NAT interfaces.  Configure Serial0/0/0 interface as a outside NAT interfaces.  Use the ip nat inside source static command to configure four static NAT mappings to map an inside local address to an inside global address as follows: Server Inside Local Address Inside Global Address Web server 192.168.1.2 20.11.15.65 DNS server 192.168.1.3 20.11.15.66 FTP server 192.168.1.4 20.11.15.67 Mail server 192.168.1.5 20.11.15.68  Save your changes to the startup-config file. Complete this lab as follows:

7. At the Router(config-if)# prompt, type ip nat inside and press Enter . 8. At the Router(config-if)# prompt, type interface s0/0/0 and press Enter . 9. At the Router(config-if)# prompt, type ip nat outside and press Enter . 10. At the Router(config-if)# prompt, type exit and press Enter . 11. At the Router(config)# prompt, type access-list 1 permit 172.16.0.0 0.0.0.255 and press Enter . 12. At the Router(config)# prompt, type ip nat inside source list 1 interface s0/0/0 overload and press Enter . 13. Press Ctrl + Z . 14. At the Router# prompt, type copy run start and press Enter . 15. Press Enter to begin building the configuration. 10.3.9 1 - Which of the following is a benefit of using network address translation (NAT)? NAT provides a measure of network security. 2 - You have a small network as shown. Router2 is connected to the internet through a fiber optic FastEthernet connection and will be configured with NAT to provide internet connectivity to your private network. What type of address would you assign to the Fa0/1 interface on Router2? OUTSIDE GLOBAL 3 - You are designing a new network that will support 6,000 computers. You only have eight registered IP addresses that can be allocated to the employees for external network communication, so you decide to implement NAT and share the addresses. You want all of these computers to be able to access the internet at the same time if necessary. Which method of NAT translation should you implement? OVERLOADING 4 - You have a small network connected to the internet as shown. Which of the following statements is true? Internet hosts can reach Srv2 without NAT. AND The router must be configured for NAT for Srv1 to communicate on the internet. 5 - You have a small business network with a single subnet connected to the internet through a Cisco router (RouterA). IP addresses are assigned as shown. A browser session on the workstation tries to connect to the www.westsim.com web server.

What IP address and port number will the web server use as the destination address when responding to the workstation's request? IP address 199.67.111.89 and a dynamic port assigned by RouterA 6 - You have a small business network with a single subnet connected to the internet. Your ISP has assigned your router an IP address of 199.211.77.5 for its serial interface. You have chosen to use a network address of 172.15.1.0/24 on your private network. You use the SDM interface to configure basic NAT on the router with a single default route to the ISP. What is the most likely result of this configuration? Your network has internet connectivity, but some websites might be unreachable. 7 - You have an office network connected to the internet as shown. The network has three subnets, all with client computers. The Web1 server on Subnet1 hosts a small website used for traveling employees. Employees must be able to contact the web server from the internet. All other hosts on the private network need to have full internet connectivity for browsing the web and sending email. On which routers should you configure NAT? ROUTER C 8 - You are the network administrator for a company that has a small block of registered IP addresses ranging from 24.1.2.32 to 24.1.2.47. You want to assign these addresses to a dynamic pool in NAT. Which command should you use? ip nat pool net-1 24.1.2.32 24.1.2.47 9 - You want to configure static NAT so that packets from host 192.168.2.100 will always be assigned the registered IP address 24.1.2.11 as shown. Match the missing lines with the required commands. Router(config)# incorrect answer. Correct Answer:ip nat inside source static 192.168.2.100 24.1.2.11 Router(config)# interface ethernet 0 Router(config-if)# incorrect answer. Correct Answer:ip nat inside Router(config-if)# interface serial 0

6. DCE V.35, clock rate 56000 7. Serial0/1/0 is the interface without an assigned IP address. The show ip interface brief command shows unassigned for interfaces that do not have an IP address. Complete this lab as follows: 1. In the top right corner, select Answer Questions . 2. Select Router to open the CLI. 3. Press Enter to get started. 4. At the prompt, type enable and press Enter to go to privileged mode. 5. Type show interface and press Enter . 6. Answer Questions 1-2. 7. Type show ip interface brief and press Enter . 8. Answer Question3. 9. Type show controllers and press Enter to configure the enable password. 10. Answer Question 4. 11. Type show interface and press Enter . 10.4.5 In this lab, your task is to:  Use the following commands to diagnose the problem: o show ip interface o show interfaces o show controllers  Correct any issues you find. When you're finished, the status of each interface should be up, and you should be able to ping each router from the other router interface. Complete this lab as follows: 1. Troubleshoot SFO. a. Select SFO . b. Press Enter to get started. c. At the SFO> prompt, type enable and press Enter . d. At the SFO# prompt, type show ip interface brief and press Enter to verify the configuration of the Serial0/1/0 interface. The status indicates a Layer 1 problem with the serial link. A Layer 1 problem can be caused by:  A disconnected cable.  A missing clock rate.  The device on the other end turning off or shutting down. 2. At the SFO# prompt, type show controllers s0/1/0 and press Enter to see which interface is the DCE interface.

The output (DTE V.35) indicates that Serial0/1/0 is the DTE interface. Because the configuration on the SFO router appears to be correct, continue troubleshooting on the LAX router. 3. Troubleshoot LAX. a. Select LAX . b. Press Enter to get started. c. At the LAX> prompt, type enable and press Enter . d. At the LAX# prompt, type show ip interface brief and press Enter . The status for Serial0/1/1 is administratively down. Take the necessary actions to correct the problem on the LAX router. e. At the LAX# prompt, type show interfaces s0/1/1 and press Enter to verify the configuration. Notice that the status is down. Verify that the encapsulation type is set correctly. f. At the LAX# prompt, type show controllers s0/1/1 and press Enter . The line DCE V.35, clock rate 0 indicates that the device is the DCE device, but the clock rate has not been set. g. At the LAX# prompt, type conf t and press Enter . h. At the LAX(config)# prompt, type int s0/1/1 and press Enter . i. At the LAX(config-if)# prompt, type clock rate 56000 and press Enter to configure the clock rate on the Serial0/1/1 interface. j. At the LAX(config-if)# prompt, type no shutdown and press Enter to bring the router up. k. Press Ctrl + Z . l. At the LAX# prompt, type show interfaces s0/1/1 and press Enter to verify the configuration. m. At the LAX# prompt, type ping 10.0.0.69 and press Enter to make sure that the two devices can communicate. 10.4.6 In this lab, your task is to:  Use the following commands to diagnose the problem: o show ip interface o show interfaces o show controllers  Correct any issues you find. When you're finished, the status of each interface should be up, and you should be able to ping each router from the other router interface. Complete this lab as follows: 1. Explore SFO. a. Select SFO . b. Press Enter to get started.

4 - You are troubleshooting connectivity issues. You had a successful ping test, but your Telnet test failed. What does this tell you? The Network layer has connectivity. 5 - On which layer of the OSI model does routing occur? NETWORK 6 - Which of the following would cause a TCP/IP connectivity issue between two routers? Both routers have an IP address of 192.168.1.100. 7 - Which of the following commands will show you the most information about each interface? show interfaces 8 - You need to view the type of serial cable that has been used on the s0/0/1 interface and which end of the cable is connected to the DCE or DTE. Which command should you use to do this? show controllers s0/0/1 9 - A connection or communication problem on the Data Link Layer could be indicated by which interface status? Line Status up and Protocol Status down 10 - There is a connection or communication problem, such as:  No clock rate provided by the DCE device.  Mismatched encapsulation.  Incorrect authentication parameters for PPP. What would the line and protocol status show? Line – UP Protocol - DOWN