Chapter 6

6.1.6 1 - Which of the following best describes how a router operates to transmit messages to different LAN segments? The router reads the LAN segment address contained in the message and consults the appropriate routing table for the protocol, then forwards the message to the appropriate LAN segment. 2 - Which of the following statements about routers are true? They use logical network and device addresses to route data between networks. AND They examine the destination device address contained in packets to make routing decisions. 3 - How does a router use frames to route data through a network? The router checks the MAC address in the frame, replaces the MAC address of the source with its own MAC address, and sends it to the proper host. 4 - Which processes does Cisco express forwarding (CEF) use to optimize packet processing through a router? Organizes routing data in the forwarding information base (FIB). AND Maintains adjacency tables. 5 - Which internal routing logic organizes routing data using a tree structure, which allows very fast searches and requires less time to route packets? Cisco express forwarding 6 - You are designing a routing solution for your organization. You want to improve routing efficiency by ensuring that routers save frequently used data link headers to encapsulate packets. Which types of routing logic could you implement? Cisco express forwarding AND Fast Switching 7 - Which Cisco express forwarding mechanism maintains Layer 2 information linked to a particular entry in the routing table, reducing the need to send ARP requests before forwarding packets? Adjacency tables 8 - Match each default administrative distance with the correct route type.

9 - Which of the following best describes a hop count? The number of routers needed to get to the destination network. 10 - The administrative distance determines the trustworthiness of the route source. Assuming that two separate routes are available to the same location, the router will use the following criteria for choosing between these routes. Put the criteria in order. 6.2.5 In this lab, your task is to:  Configure a static route to 10.0.0.0/8 network.

To your Internet Service Provider 3 - Which of the following is a disadvantage of static routing? Require more configuration time 4 - Match each route types with its description. 5 - You have issued the following command on your router: Router(config)#ip route 202.22.12.0 255.255.255.0 192.168.1.1 Which of the following are configured by the parameters in this command? A route to network 202.22.12.0 is added. AND The next hop router address is 192.168.1.1. 6 - You are the administrator of the network shown. You want to configure the stub network located in Tampa to forward packets to Chicago, but you do not want the overhead associated with a routing protocol. Which of the following will accomplish your goal? Tampa(config)# ip route 0.0.0.0 0.0.0.0 182.1.48.3 Chicago(config)# ip route 182.1.48.0 255.255.240.0 182.1.48.4 Chicago(config)# ip route 192.168.112.128 255.255.255.248 182.1.48.4 7 - You need to configure a static route on your Cisco router. The destination network is 192.65.178.0 with a subnet mask of 255.255.255.0. The default gateway is 192.65.179.1, and the IP address of the destination host for the message is 192.65.178.15. Which of the following commands configures this route? ip route 192.65.178.0 255.255.255.0 192.65.179.1 8 - You have a small network as shown. You want to configure a route so that packets sent to any non-directly connected network get sent to RouterB. Which command would you use?

ip route 0.0.0.0 0.0.0.0 192.168.4.14 9 - You have a small network as shown. You have configured RIP on both RouterA and RouterB. The show ip route command on RouterA shows the following information: Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set R 10.0.0.0/8 [120/1] via 192.168.4.14, 00:00:02, Serial0/1/0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 192.168.4.0/30 is subnetted, 1 subnets C 192.168.4.12 is directly connected, Serial0/1/0 You want to configure a default route so that all packets for unknown networks are sent to RouterB. Which command should you use? ip default-network 10.0.0.0 10 - You have a small network as shown. You have configured RIP on both RouterA and RouterB. The show ip route command on RouterA shows the following information: Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set R 10.0.0.0/8 [120/1] via 192.168.4.2, 00:00:02, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/0 C* 192.168.4.0/24 is directly connected, FastEthernet0/1 C 192.168.2.0/24 is directly connected, FastEthernet0/2 RouterA receives a packet addressed to 172.16.0.1. What will RouterA do with the packet? Drop the packet.

6.3.10 1 - Which of the following are the main components of Dynamic Routing Protocols? Routing protocol messages AND Algorithm AND Data Structures 2 - Which of the following is an EGP that an ISP uses to send packets across the internet from one internal network to another? Border Gateway Protocol (BGP) 3 - Which protocol was created in the 1980s, was improved over the years, and is still used for small networks? RIP 4 - Which of the following are true about the distance vector method of sharing routing table information? The entire routing table is sent to neighbor routers. AND Routers send routing information only to their neighbor routers. 5 - Which of the following methods of preventing the count-to-infinity problem with distance vector routers will send a hop count of 16 back up the path from which the information was obtained? Split horizon with poison reverse 6 - Which feature implemented with a Distance Vector Routing Protocol reduces the convergence time? Triggered updates 7 - Which of the following are components of a Link-State Routing Protocol? SPF tree AND Routing table of paths and ports AND Hello packets 8 - Which of the following are problems typically associated with the link-state routing method? High traffic to build routing tables. AND Increased use of router hardware resources. 9 - How are Distance Vector Routing Protocols similar to Link-State Routing Protocols?

The trustworthiness of both types of routing protocols is rated by an administrative distance. AND The Distance Vector Routing Protocol RIP and the Link-State Routing Protocol OSPF are both interior gateway protocols. 10 - Which protocol can have a higher Memory and CPU requirement than the others? OSPF 6.4.8 1 - Paul executed the show interfaces command and reviewed the output. Which output indicates a Layer 2 problem with the Serial0/1/1 interface? Serial0/1/1 is up, line protocol is down. 2 - Kathy executed the show interfaces command on a router and reviewed the output. Which output indicates a Layer 1 problem with the Serial0/1/1 interface? Serial0/1/1 is down, line protocol is down. 3 - When attempting to make a Telnet connection to a remote router, the connection fails. You check the interface status on your local router and find the following: Serial0/1/0 is up, line protocol is up Hardware is GT96K Serial Internet address is 192.168.2.1/24 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HDLC, loopback not set Keepalive set (10 sec) ... (additional output omitted ) You ping the remote router, but that fails as well. At which layer of the OSI model does this problem originate? Layer 3 4 - IP traffic destined for a device configured with the address 10.10.34.4/24 is congesting the network. The network administrator issues a traceroute command from the local router and receives the following output: Router#traceroute 10.10.34.4 Type escape sequence to abort. Tracing the route to 10.10.34.4

8 - Last night, an administrator connected a new router to his network and enabled the RIP routing protocol. This morning, when the administrator returned, he discovered the router wasn't forwarding packets to networks connected to the Serial1 interface. He examines the routing table using the command show ip route . What could be the cause of the problem? The Serial1 interface is administratively shut down. 9 - Router_1 is connected to three networks, 192.168.0.0, 172.16.16.0, and 172.16.32.0. An administrator enables the RIP routing protocol on Router_1. The router isn't forwarding packets to network 172.16.16.0. The administrator examines the configuration on Router_1 using the sh run command. What should the administrator do to correct the problem? Enable the Serial0 interface. 10 - The administrator of a corporate network is receiving complaints from internal users that they cannot access the internet. The administrator displays the routing table of the local router using the show ip route command. What should the administrator do on the local router to provide internal users access to the internet? Configure a default route using ip route 0.0.0.0 0.0.0.0 131.108.2.2 . 6.5.7 Required Actions Set the IP address on the switch Enable the Fa0/0 interface on the SFO router Set the default gateway on the switch Explanation Complete this lab as follows: 1. Select Wrk1 . 2. At the command prompt, type ping 192.168.11.2 and press Enter to verify that you can ping Wrk2. The ping succeeds. 3. At the command prompt, type tracert 192.168.11.2 and press Enter and trace the route to Wrk2. Notice that the switch does not show in the path because the switch is a Layer 2 device

and uses the MAC address to pass frames between ports. Ping is a Layer 3 tool that uses IP addresses. 4. Select Branch1 . 5. Press Enter to get started. 6. At the Branch1> prompt, type enable and press Enter . 7. At the Branch1# prompt, type show ip interface brief and press Enter . Notice that the Branch1 switch does not have an assigned IP address. The VLAN 1 interface shows unassigned in the IP-Address column. 8. At the Branch1# prompt, type ping 192.168.11.1 and press Enter . The ping fails because the switch does not have an IP address. 9. Configure Vlan1 on the Branch1 switch with the following IP address: 192.168.1.1 with a mask of 255.255.255.0. a. At the Branch1# prompt, type conf t and press Enter . b. At the Branch1(config)# prompt, type int vlan 1 and press Enter . c. At the Branch1(config-if)# prompt, type ip address 192.168.1.1 255.255.255.0 and press Enter . d. Press Ctrl + Z . 10. At the Branch1# prompt, type ping 192.168.11.1 and press Enter to ping Wrk1. The ping fails because the IP address assigned to the switch is not on the same subnet as the IP address assigned to the workstation. Even though they are on the same network segment, the IP addresses are not on the same subnet. 11. At the Wrk1 prompt, type ping 192.168.11.2 and press Enter to ping Wrk2. The ping succeeds. Switching takes place regardless of the IP address configured on a switch. 12. Change the IP address on Branch1 to the correct IP address. a. At the Branch1# prompt, type conf t and press Enter . b. At the Branch1(config)# prompt, type int vlan 1 and press Enter . c. At the Branch1(config-if)# prompt, type ip address 192.168.11.250 255.255.255.0 and press Enter . d. Press Ctrl + Z . 13. At the Branch1# prompt, type ping 192.168.11.1 and press Enter to ping Wrk1. The ping succeeds because the switch now has an IP address on the same subnet as the workstations. 14. On Wrk1, at the command prompt, type tracert 192.168.11.2 and press Enter and trace the path between Wrk1 and Wrk2. Setting an IP address on the switch does not affect the trace route output because the switch is operating at Layer 2. 15. On Branch1, at the Branch1# prompt, type ping 192.168.11.254 and press Enter to ping the SFO Fa0/0 interface. The ping fails. 16. At the Branch1# prompt, type show ip interface brief and press Enter . 17. Select SFO . 18. Press Enter to get started. 19. At the SFO> prompt, type enable and press Enter .

The user on workstation A reports that he cannot communicate with remote workstation E. You begin to troubleshoot the problem by sending a ping from workstation A to remote workstation E, but you cannot reach this host. Next, you try sending pings from workstation A to the remote workstations C and D, and you cannot reach either of them. You also try pinging the IP address assigned to interface 1 on the Default Gateway router, which is also unsuccessful. Finally, you ping workstation B, and this time, you get a successful reply. Which of the following can you assume based on these results? There is a problem with the default gateway router. 3 - You have a workstation connected to a small network with one subnet. The subnet is connected to the internet through a local ISP. You are having trouble connecting to one of your favorite websites. You issue a tracert command and see the output shown below: C:\tracert 166.77.11.1 Tracing route to 166.77.11.1 over a maximum of 30 hops 1 * * * Request timed out. 2 * * * Request timed out. 3 * * * Request timed out. 4 * * * Request timed out. --additional output omitted Which of the following is the most likely cause of the problem? The local workstation is configured with an incorrect default gateway address. AND Your local router is down. 4 - Which of the following utilities gives you the most information about the operational status of a router? telnet 5 - You have a workstation connected to a small network with one subnet. The subnet is connected to the internet through a local ISP. You are having trouble connecting to one of your favorite websites. You issue a tracert command and see the output shown below: C:\tracert 166.77.11.1 Tracing route to 166.77.11.1 over a maximum of 30 hops

1 2 ms 1 ms 1 ms a.abc.net [209.63.168.50] 2 2 ms 1 ms 1 ms c.xyz.net [209.60.11.1] 3 * * * Request timed out. 4 * * * Request timed out. --additional output omitted Which of the following is the most likely cause of the problem? The destination network can be reached, but the host does not respond. AND A router in the path does not have a route to the destination network. 6 - You have a Windows workstation connected to a small network. Match each function on the left with its associated utility on the right. 7 - Which of the following commands lists a workstation's ARP cache? Arp -a