7. IP Routing Technologies
Which of the following best describes a switch virtual interface (SVI) on a multi-layer switch? (Select two.)
A SVI is most commonly implemented to interconnect the VLANs between distribution and access switches in a multi-switch network. A multi-layer switch treats a SVI as a physical link through which it can route traffic.
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
Use the exhibit to answer this question. Your network has four VLANs with multiple computers in each VLAN. You want to enable interVLAN routing. How must you assign the IP addresses for each VLAN.
All the computers within the same VLAN must belong to the same IP subnet.
What is the default administrative distance for OSPF?
110
You have a network with three routers as shown in the Exhibit. All routers are configured to share information for all known routes using the same routing protocol. Automatic summarization is enabled. Router B shares its known networks with router C. Which of the following routes will be in router C's routing table?
172.16.0.0/16
You use the show ip route command on your router and see the information shown below: Gateway of last resort is not set 172.16.0.0/28 is subnetted, 5 subnets C 172.16.0.0 is directly connected, FastEthernet0/0 C 172.16.0.32 is directly connected, FastEthernet0/1 R 172.16.0.96 [120/1] VIA 172.16.0.12, 00:00:25, FastEthernet0/0 R 172.16.0.128 [120/2] via 172.16.0.12, 00:00:25, FastEthernet0/0 R 172.16.0.144 [120/1] via 172.16.0.33, 00:00:25, FastEthernet0/1 Match the router interface on the left with the address used to reach the destination network.
172.16.0.19 Dropped Packet 172.16.0.109 FastEthernet0/0 172.16.0.158 FastEthernet0/1 172.16.0.178 Dropped Packet
You have a network with three routers as shown in the Exhibit. All routers are configured to share information for all known routes using the same routing protocol. Automatic summarization is enabled. Router B shares its known networks with router A. Which of the following routes will be in router A's routing table?
172.16.2.0/27, 172.16.2.32/28, and 172.16.2.48/28
You use the show ip route command on your router and see the information shown below: Gateway of the last resort is 192.168.2.12 to network 0.0.0.0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 C 192.168.2.0/24 is directly connected, FastEthernet0/1 C 192.168.11.0/24 is directly connected, FastEthernet1/0 R 192.168.15.0/24 [120/1] via 192.168.1.15, 00:00:25, FastEthernet0/0 R 192.168.20.0/24 [120/2] via 192.168.1.15, 00:00:25, FastEthernet0/0 R 192.168.25.0/24 [120/1] via 192.168.11.15, 00:00:12, FastEthernet1/0 S* 0.0.0.0/0 [1/0] via 192.168.2.12 Match the router interface on the left with the address used to reach the destination network.
192.168.1.45 FastEthernet0/0 192.168.11.166 FastEthernet1/0 192.168.3.45 FastEthernet0/1 192.168.15.192 FastEthernet0/0 192.168.25.211 FastEthernet1/0 192.168.111.30 FastEthernet0/1
You have a network with two routers as shown in the Exhibit. RouterA and RouterB are configured to use RIP version 2 with auto-summarization enabled. Which summarized network entry will RouterA have in its routing table for the subnets connected to RouterB?
192.168.12.0/24
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 output shown below. Router#traceroute 10.10.34.4 Type escape sequence to abort. Tracing the route to 10.10.34.4 1 192.168.12.2 20 msec 20 msec 20 msec 2 192.168.12.1 8 msec 12 msec 8 msec 3 192.168.12.2 8 msec 8 msec 12 msec 4 192.168.12.1 12 msec 8 msec 8 msec 5 192.168.12.2 8 msec 8 msec 12 msec 6 192.168.12.1 8 msec 12 msec 8 msec !--remaining output omitted -- What is the cause of the problem?
A loop exists between two of the routers
Use the exhibit to answer this question. To create a separate broadcast domains, you enable four VLANs on your Catalyst 2950 switch. You then placed a single host computer in each VLAN. Now the computer in VLAN1 can no longer communicate with the computers in the other VLANs. What must you do to enable communications between VLANs?
Add a router-on-a-stick.
The users of a network are complaining that they can connect to resources within the company, but cannot use the Internet. The network administrator begins troubleshooting the problem by entering privileged EXEC mode on the company router and typing the show ip route command. The results are shown in the Exhibit. What is the most probable cause of the problem?i
An incorrect next-hop route has been statically configured on the local router
You are troubleshooting a basic serial connection on your router. The show interface serial 0/1/0 command shows the following information: Serial0/1/0 is down, line protocol is down 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)
Check the cable connector on the router
Which internal routing logic organizes routing data using a tree structure for very fast searches, requiring less time to route packets?
Cisco express forwarding
Which routing logic organizes routing data in the forwarding information base (FIB)?
Cisco express forwarding
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 he show ip route command. The results of the routing table are shown in the Exhibit. 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
Use the Exhibit to answer this question. A Catalyst 2950 switch supporting only VLAN2 is connected to router interface fa0/1. A second Catalyst 2950 switch supporting VLAN3 is connected to the same router on fa0/2. Each switch is using 802.1Q trunking. You want to permit interVLAN routing between VLAN2 and VLAN3. What should you do? (Choose two.)
Configure a unique IP network address for each VLAN on each router interface. On the router, encapsulate 802.1Q for VLAN2 on fa0/1 and VLAN3 on fa0/2.
You are working at the console of a new router. You want to check the configuration of a neighboring router called Sales5. You type telnet Sales5 at the router prompt and receive the following message: Translating "Sales5"...domain server (255.255.255.255) % Unknown command or computer name, or unable to find computer address What should you do?
Configure an address of a DNS server for the router to contact
You have two switches as shown in the following diagram. Each switch has hosts from two separate VLANs. How would you connect the switches so that hosts in VLAN1 on one switch can communicate with hosts in the same VLAN on the other switch?
Connect both switches with a crossover cable.
You have two switches as shown in the following diagram. Each switch has hosts from two separate VLANs. How would you connect the switches so that hosts in VLAN1 can communicate with hosts on VLAN2?
Connect both switches with a router using straight-through cables.
You have a small network as shown in the Exhibit. 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, 0-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, o-ODR, P-periodic downloaded static route Gateway of the 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
You use the show ip route command on your router and see the information shown below: Gateway of last resort is not set C 192.168.1.0 is directly connected, FastEthernet0/0 C 192.168.2.0 is directly connected, FastEthernet0/1 172.16.0.0/24 is subnetted, 1 subnets C 172.16.11.0 is directly connected, Serial0/1/0 R 10.0.0.0/8 [120/1] via 172.16.11.12, 00:00:04, Serial0/1/0 The router receives a packet on the FastEthernet0/1 interface addressed to 192.168.3.155. What will the router do with the packet?
Drop the packet.
Match the default administrative distance with the route type. (Each routing method may be used once, more then once, or not at all.)
EIGRP internal routes - 90 EIGRP external routes - 170 OSPF - 110 RIP - 120 Static routes - 1
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. However, the router isn't forwarding packets to network 172.16.16.0. The administrator examines the configurations on Router_1 using the sh run command. The results are displayed are seen in the exhibit. What should the administrator do to correct the problem?
Enable the Serial0 interface
Use the exhibit to answer this question. A Catalyst 1900 switch with multiple VLANs is connected to a single physical interface on a Cisco 2600 router. The switch is using ISL trunking. You want to permit interVLAN routing between each of the VLANs. What should you do? (Choose two.)
Encapsulate ISL on each router subinterface for the VLAN it supports. Configure a subinterface for each VLAN and assign a unique IP network address for each VLAN.
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? (Select two.)
Fast switching Cisco express forwarding
You use the show ip route command on your router and see the information shown below: Gateway of last resort is not set 172.16.0.0/28 is subnetted, 4 subnets C 172.16.0.0 is directly connected, FastEthernet0/0 C 172.16.0.32 is directly connected, FastEthernet0/1 R 172.16.0.96 [120/1] VIA 172.16.0.1, 00:00:25, FastEthernet0/0 R 172.16.0.128 [120/1] via 172.16.0.33, 00:00:25, FastEthernet0/1 The router receives a packet addressed to 172.16.0.19 and one addressed to 172.16.0.109. What will the router do with each packet? (Select two.)
Forward the packet addressed to 172.16.0.109 to router 172.16.0.1 Drop the packet addressed to 172.16.0.19
You use the show ip route command on your router and see the information shown below: Gateway of the last resort is 172.16.11.12 to network 0.0.0.0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 C 192.168.2.0/24 is directly connected, FastEthernet0/1 172.16.0.0/24 is subnetted, 1 subnets C 172.16.11.0 is directly connected, Serial0/1/0 R 10.0.0.0/8 [120/1] VIA 172.16.11.12, 00:00:04, Serial0/1/0 S* 0.0.0.0/0 [1/0] via 172.16.11.12 The router receives a packet on the FastEthernet0/1 interface addressed to 192.168.3.155. What will the router do with the packet?
Forward the packet out Serial0/1/0
You use the show ip route command on your router and see the information shown below: Gateway of the last resort is 172.16.11.12 to network 0.0.0.0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 C 192.168.2.0/24 is directly connected, FastEthernet0/1 172.16.0.0/24 is subnetted, 1 subnets C 172.16.11.0 is directly connected, Serial0/1/0 R* 10.0.0.0/8 [120/1] via 172.16.11.12, 00:00:04, Serial0/1/0 The router receives a packet on the FastEthernet0/1 interface addressed to 192.168.3.155. What will the router do with the packet?
Forward the packet out Serial0/1/0
Which of the following symptoms indicate a layer 1 problem with the Serial0/1/1 interface?
Interface status shows Serial0/1/1 is down, line protocol is down
Which of the following symptoms indicate a layer 2 problem with the Serial0/1/1 interface?
Interface status shows Serial0/1/1 is up the line protocol is down
Which processes are used by Cisco express forwarding (CEF) to optimize packet processing through a router? (Select two.)
It maintains adjacency tables It organizes routing data in the forwarding information base (FIB)
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 the problem originate?
Layer 3
Match each routing method on the left with its associated characteristics on the right. Each routing method may be used once, more then once, or not at all.
Most appropriate on small networks - Static routing Propagates changes in the network topology - Dynamic routing Provides complete control over routes - Static routing Most appropriate on networks that don't change frequently - Static routing Keeps routing tables on each router up to date - Dynamic routing
You have a small network with IP addresses assigned to router interfaces as shown in the Exhibit. You need to configure a static route on RouterA for SubnetC. Which command would you use?
RouterA(config)#ip route 10.155.64.96 255.255.255.240 fa 0/1
You have a small network with IP addresses assigned to router interfaces as shown in the Exhibit. You need to configure a static route on RouterB for SubnetA. Which command would you use? (Select two.)
RouterB(config)#ip route 192.168.111.128 255.255.255.128 172.18.12.197 RouterB(config)#ip route 192.168.111.128 255.255.255.128 fa 0/0
You are configuring a Catalyst 3550 switch for interVLAN routing. You are adding VLAN 11 to the switch. The VLAN 1 and 2 interfaces already have a configuration on the switch, and now you need to configure the VLAN 11 interface. Which commands would you use?
Switch(config)#int vlan 11 Switch(config-if)#ip address 172.16.11.1 255.255.255.0 Switch(config-if)#no shut
You are the administrator of the network shown in the Exhibit. 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
RouterA, RouterB, and RouterC have been configured with IP addresses set as shown in the exhibit. All networks are using the default subnet mask. Users in the network 10.1.1.0 claim they cannot access resources in network 192.168.2.0. From network 10.1..1.0, you can successfully ping interface 172.16.32.2, but you cannot ping 172.16.32.1. Another administrator on 192.168.2.0 claims she can ping 192.168.2.1. but not 172.16.32.1. What is the most likely problem?
The S0/1/1 interface on Router C is administratively down
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. The results displayed are seen in the exhibit. What could be the cause of the problem.?
The Serial1 interface is administratively shut down
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? (Select two.)
The next hop router address is 192.168.1.1 A route to network 202.22.12.0 is added
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.
You use the show ip route command on a Cisco router and see the following information: Codes: C-connected, S- static, R-RIP, M-mobile, B-BGP D-EIGRP, EX-EIGRP external, 0-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, o-ODR, P-periodic downloaded static route Gateway of the last resort is not set R 10.0.0.0/8 [120/3] 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 D 172.16.0.0/16 [90/2172416] via 192.168.4.14, 00:00:49, Serial0/1/0 O 172.17.0.0/16 [110/68] via 192.168.4.14. 00:00:25, Serial0/1/0 Which of the following are true? (Select two.)
The router has learned about routes through three routing protocols For the route 172.17.0.0, the number 68 indicates the route cost
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.
You are implementing interVLAN routing using a router-on-a-stick configuration as shown in the Exhibit. You configure the router as follows: A(config)#int fa 0/1 A(config-if)#no shutdown A(config-if)#int fa0/1.1 A(config-subif)#encapsulation dot1q 1 native A(config-subif)#ip address 192.168.1.1 255.255.255.0 A(config-subif)#int fa 0/1.2 A(config-subif)#encapsulation dot1q 2 A(config-subif)#ip address 192.168.2.1 255.255.255.0 Which of the following is true? (Select two.)
The router will not use 802.1Q to encapsulate VLAN 1 traffic. The hosts in VLAN 2 will have 192.168.2.1 as the default gateway IP address.
You are implementing interVLAN routing using a multi-layer switch as shown in the Exhibit. You configure the switch as follows: A(config)#int vlan 1 A(config-if)#ip address 192.168.1.1 255.255.255.0 A(config-if)#no shutdown A(config-if)#int vlan 2 A(config-if)#ip address 192.168.2.1 255.255.255.0 A(config-if)#no shutdown Which of the following is true? (Select two.)
The switch can route between VLAN interfaces 1 and 2 as if the interfaces were physical links. The hosts in VLAN 1 will use 192.168.1.1 as the default gateway IP address.
Which two of the following statements about routers are true?
They examine the destination device address contained in packets to make routing decisions. They use logical network and device addresses to route data between networks.
You have a network with two routers as shown in the Exhibit. Router A currently has a single static route to network 10.0.155.80/28. You need to add another subnet to router B. This subnet should also use a 28-bit mask. You would like to replace the existing static route to network 10.0.155.80/28 with a single summarized static route that includes the old network and the new network. You want to minimize wasted addresses. What should you do? (Select two).
Use 10.0.155.64/28 for the new subnet Configure the static route to use a network of 10.0.155.64 and a mask of 255.255.255.224
You are troubleshooting a basic serial connection on your router. The show interface serial 0/1/0 command shows the following information: Serial0/1/0 is up, line protocol is down 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) What should be your first step in troubleshooting the problem?
Verify that the encapsulation is correctly configured
You have a small network as shown in the Exhibit. 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, 0-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, o-ODR, P-periodic downloaded static route Gateway of the 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
You have a small network as shown in the Exhibit. 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
You have a network with two routers as shown in the Exhibit. You would like to configure a single static route on RouterA that summarizes the routes accessible through RouterB. Which static route would you configure?
ip route 172.17.1.64 255.255.255.192 serial 0/1/0
You have a network with two routers as shown in the Exhibit. You would like to configure a single static route on RouterA that summarizes the routes accessible through RotuerB. Which static route would you configure?
ip route 192.168.100.64 255.255.255.192 192.168.100.34
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
You are configuring an 1841 Cisco router for interVLAN communication. You would like to use one physical interface to handle the incoming traffic from VLANs 2 and 10. The switch connected to the router is sending 802.1Q encapsulated traffic for VLAN 2 but is not encapsulating VLAN 10. Which command would you use to ensure that the router correctly handles traffic coming from the switch?
router(config-subif)#encapsulation dot1q 10 native
You are configuring an 1841 Cisco router for interVLAN communication. You would like to use one physical interface to handle the incoming VLANs 2 and 10. The VLANs are encapsulated with 802.1Q tags. Which commands would you use to configure the physical interface for VLAN 2? (Select three.)
router(config-subif)#ip address 172.16.2.1 255.255.255.0 router(config-subif)#encapsulation dot1q 2 router(config-if)#int fa 0/1.2