CCNA Exploration version 4.0 ERouting final exam
CCNA1 ERouting Final 3a
Answer mark is (*).
1. Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through a router? (Choose three.)
(*)The router modifies the TTL field, decrementing it by one.
The router changes the source IP to the IP of the exit interface.
(*)The router maintains the same source and destination IP.
(*)The router changes the source physical address to the physical address of the exit interface.
The router changes the destination IP to the IP of the exit interface.
The router sends the packet out all other interfaces, besides the one it entered the router on.
2. Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.)
(*)10.0.0.0/8
64.100.0.0/16
128.107.0.0/16
172.16.40.0/24
192.168.1.0/24
(*)192.168.2.0/24
3. Which two statements are correct about the split horizon with poison reverse method of routing loop prevention? (Choose two.)
It is enabled by default on all Cisco IOS implementations.
(*)It assigns a value that represents an infinite metric to the poisoned route.
(*)It sends back the poisoned route update to the same interface from where it was received.
It instructs routers to hold all changes that might affect routes, for a specified period of time.
It limits the number of hops a packet can traverse through the network before it is discarded.
4. A network administrator has enabled RIP on routers B and C in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A?
A(config)# router rip
A(config-router)# passive-interface S0/0
--------------------------------------------
B(config)# router rip
B(config-router)# network 192.168.25.48
B(config-router)# network 192.168.25.64
--------------------------------------------
A(config)# router rip
A(config-router)# no network 192.168.25.32
--------------------------------------------
(*)B(config)# router rip
B(config-router)# passive-interface S0/0
--------------------------------------------
A(config)# no router rip
5. Refer to the exhibit. Which two statements are true based on the exhibited output? (Choose two.)
The administrative distance of EIGRP has been set to 50.
(*)All routes are stable.
(*)The show ip eigrp topology command has been run on R1.
The serial interface between the two routers is down.
Each route has one feasible successor.
6. Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three.)
The route to network 172.16.0.0 has an AD of 156160.
Network 192.168.0.16 can best be reached using FastEthernet0/0.
(*)The AD of EIGRP routes has been manually changed to a value other than the default value.
(*)Router1 is running both the EIGRP and OSPF routing process.
Network 172.17.0.0 can only be reached using a default route.
(*)No default route has been configured.
7. Which two router component and operation pair are correctly described? (Choose two.)
DRAM - loads the bootstrap
RAM - stores the operating system
Flash - executes diagnostics at bootup
(*)NVRAM - stores the configuration file
ROM - stores the backup configuration file
(*)POST - runs diagnostics on hardware modules
8. What are two tasks that must be completed before two routers can use OSPF to form a neighbor adjacency? (Choose two.)
The routers must elect a designated router.
(*)The routers must agree on the network type.
(*)The routers must use the same dead interval.
The routers must exchange link state requests.
The routers must exchange database description packets.
9. Which of the following are primary functions of a router? (Choose two.)
(*)packet switching
microsegmentation
domain name resolution
(*)path selection
flow control
10. Refer to the exhibit. Which statement is true concerning the routing configuration?
Using dynamic routing instead of static routing would have required fewer configuration steps.
The 10.1.1.0/24 and 10.1.2.0/24 routes have adjacent boundaries and should be summarized.
(*)Packets routed to the R2 Fast Ethernet interface require two routing table lookups.
The static route will not work correctly.
11. Refer to the exhibit. The results of the show ip route command are displayed in the graphic for Router R2. Which route will be selected for a packet with a destination address of 10.1.4.1?
(*)route to 0.0.0.0/0
route to 10.1.0.0/22
route to 10.1.0.0/23
route to 10.1.0.0/24
12. Refer to the exhibit.
(*)ip route 172.16.0.0 255.255.0.0 S0/0
ip route 172.16.0.0 255.255.0.0 S0/1
ip route 172.16.0.0 255.255.0.0 192.168.0.1
(*)ip route 172.16.0.0 255.255.0.0 192.168.0.2
ip route 192.168.0.1 172.16.0.0 255.255.0.0 S0/0
ip route 192.168.0.1 172.16.0.0 255.255.0.0 S0/1
13. What can be determined from the output shown in the exhibit? (Choose two.)
All of the routers are connected to
(*)
Layer 3 connectivity is operational for all of the devices listed in the Device ID column.
An administrator consoled into the Waldorf router can ping the Brant router.
(*)Brant, Fisherman, and Potomac are directly connected to
14. Refer to the exhibit. Which path will traffic from the 172.16.1.0/24 network take to get to the 10.0.0.0/24 network?
ADC
ABC
(*)It will load balance the traffic between ADC and ABC
It will send the traffic via ABC, and will use ADC as a backup path only when ABC fails.
15. Which two statements are true regarding link-state routing protocols? (Choose two.)
(*)They are aware of the complete network topology.
(*)They offer rapid convergence times in large networks.
They do not include subnet masks in their routing updates.
They rely on decreasing hop counts to determine the best path.
They do not work well in networks that require special hierarchical designs.
They pass their entire routing tables to their directly connected neighbors only.
16. Refer to the routing table shown in the exhibit. What is the meaning of the highlighted value 192?
It is the value assigned by the Dijkstra algorithm that designates the number of hops in the network.
It is the value used by the DUAL algorithm to determine the bandwidth for the link.
(*)It is the metric, which is cost.
It is the administrative distance.
17. A router has learned about a network through static and dynamic routing processes. Which route will be used to reach network 192.168.168.0?
D 192.168.168.0/24 [90/2195456] via 192.168.200.1, 00:00:09, Ethernet0
O 192.168.168.0/24 [110/1012] via 192.168.200.1, 00:00:22, Ethernet0
R 192.168.168.0/24 [120/1] via 192.168.200.1, 00:00:17, Ethernet0
(*)S 192.168.168.0/24 [1/0] via 192.168.200.1
18. When presented with multiple valid routes to a destination, what criteria does a router use to determine which routes to add to the routing table?
The router selects the routes with the best metric. All routes that have the same best metric are added to the routing table.
(*)The router first selects routes with the lowest administrative distance.
The resulting routes are then prioritized by metric and the routes with the best metric are added to the routing table.
The router selects the routes with the lowest administrative distance. All routes with the same lowest administrative distance are added to the routing table.
The router installs all routes in the routing table but uses the route with the best metric most when load balancing.
19. What does RIP use to reduce convergence time in a larger network?
It uses multicast instead of broadcast to send routing updates.
It reduces the update timer to 15 seconds if there are more than 10 routes.
(*)It uses triggered updates to announce network changes if they happen in between the periodic updates.
It uses random pings to detect if a pathway is down and therefore is preemptive on finding networks that are down.
20. Refer to the exhibit. The network is using the RIPv2 routing protocol. If network 10.0.0.0 goes down, what mechanism will prevent Router1 from advertising false routing information back to Router2?
triggered updates
poison reverse
holddown timers
(*)split horizon
21. Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statement is true regarding how the routers in this topology will respond to this event?
Router4 will learn about the failed route 30 seconds later in the next periodic update.
Router5 immediately flushes the unreachable route from its routing table.
(*)Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0.
22. What is the purpose of the TTL field within an IP packet header?
clears an unreachable route from the routing table after the invalid timer expires
prevents regular update messages from inappropriately reinstating a route that may have gone bad
removes an unreachable route from the routing table after the flush timer expires
(*)limits the period of time or number of hops a packet can traverse through the network before it should be discarded
used to mark the route as unreachable in a routing update that is sent to other routers
23. Which statement is true regarding routing metrics?
All routing protocols use the same metrics.
EIGRP uses bandwidth as its only metric.
(*)Routers compare metrics to determine the best route.
The larger metric generally represents the better path.
24. Refer to the exhibit. When troubleshooting a network, it is important to interpret the output of various router commands. On the basis of the exhibit, which three statements are true? (Choose three.)
(*)The missing information for Blank 1 is the command show ip route.
The missing information for Blank 1 is the command debug ip route.
The missing information for Blank 2 is the number 100.
(*)The missing information for Blank 2 is the number 120.
The missing information for Blank 3 is the letter R.
(*)The missing information for Blank 3 is the letter C.
25. Refer to the exhibit. What is the most efficient summarization of the routes attached to router R1?
198.18.0.0/16
(*)198.18.48.0/21
198.18.32.0/22
198.18.48.0/23
198.18.49.0/23
198.18.52.0/22
26. The network shown in the diagram is having problems routing traffic. It is suspected that the problem is with the addressing scheme. What is the problem with the addressing used in the topology?
The address assigned to the Ethernet0 interface of Router1 is a broadcast address for that subnetwork.
(*)The subnetwork configured on the serial link between Router1 and Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3.
The subnetwork assigned to the Serial0 interface of Router1 is on a different subnetwork from the address for Serial0 of Router2.
The subnetwork assigned to Ethernet0 of Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3.
27. Refer to the exhibit. How many routes are both level 1 and qualify for use as an ultimate route?
1
(*)2
3
4
5
6
28. The
(*)IP classless has been disabled on the
The ip subnet-zero command was not configured on the
The
The route was ignored if the
29. Which three statements describe the operation of routing with EIGRP? (Choose three.)
(*)As new neighbors are discovered, entries are placed in a neighbor table.
If the feasible successor has a higher advertised cost than the current successor route, then it becomes the primary route.
(*)If hello packets are not received within the hold time, DUAL must recalculate the topology.
(*)The reported distance is the distance to a destination as advertised by a neighbor.
EIGRP maintains full knowledge of the network topology in the topology table and exchanges full routing information with neighboring routers in every update.
EIGRP builds one routing table that contains routes for all configured routed protocols.
30. Refer to exhibit. Given the topology shown in the exhibit, what three commands are needed to configure EIGRP on the
(*)Paris(config)# router eigrp 100
Paris(config)# router eigrp
Paris(config-router)# network 192.168.6.0
(*)Paris(config-router)# network 192.168.7.0
(*)Paris(config-router)# network 192.168.8.0
Paris(config-router)# network 192.168.9.0
31. A network administrator has configured a default route on Router_A but it is not being shared with adjacent Router_B and the other routers in the OSPF area. Which command will save the administrator the time and trouble of configuring this default route on Router_B and all of the other routers in the OSPF area?
Router_A(config-router)# ospf redistribute default-route
Router_B(config-router)# ospf redistribute default-route
(*)Router_A(config-router)# default-information originate
Router_B(config-router)# default-information originate
Router_A(config-router)# ip ospf update-default
Router_B(config-router)# ip ospf update-default
32. Which of the following are required when adding a network to the OSPF routing process configuration? (Choose three.)
(*)network address
loopback address
autonomous system number
subnet mask
(*)wildcard mask
(*)area ID
33. What should be considered when troubleshooting a problem with the establishment of neighbor relationships between OSPF routers? (Choose two.)
(*)OSPF interval timers mismatch
administrative distance mismatch
(*)interface network type mismatch
no loopback interface configured
gateway of last resort not redistributed
34. Refer to the exhibit. The routers in the exhibit are running the EIGRP routing protocol. What statement is true regarding how packets will travel from the 172.16.1.0/16 network to the 192.168.200.0/24 network?
The router chooses the first path that it learned and installs only that route in the routing table.
The router chooses the path with the lowest administrative distance and installs only that route in the routing table.
The router chooses the highest routing ID based on the advertised network IP addresses and installs only that route in the routing table.
The router installs all the equal cost paths in the routing table but sends packets out only one, holding the others in reserve in case the primary route goes down.
(*)The router installs all the equal cost paths in the routing table and performs equal cost load balancing to send packets out multiple exit interfaces.
35. What is the first step OSPF and IS-IS routers take in building a shortest path first database?
(*)learn about directly connected networks
send hello to discover neighbors and form adjacencies
choose successors and feasible successors to populate the topology table
flood LSPs to all neighbors informing them of all known networks and their link states
36. Refer to the exhibit. Routers 1 and 2 are directly connected over a serial link.
Set the encapsulation on both routers to PPP.
Decrease the bandwidth on Serial 0/1/0 on router 2 to 1544.
Change the cable that connects the routers to a crossover cable.
(*)Change the IP address on Serial 0/1/0 on router 2 to 192.168.0.1/30.
37. Refer to the exhibit. The network administrator issues the command no ip classless on Router1. What forwarding action will take place on a packet that is received by Router1 and is destined for host 192.168.0.26?
(*)The packet will be dropped.
The packet will be forwarded to the gateway of last resort.
The packet will match the 192.168.0.0 network and be forwarded out Serial 0/0.
The packet will most closely match the 192.168.0.8 subnet and be forwarded out Serial 0/1.
38. The network administrator configures the router with the ip route 172.16.1.0 255.255.255.0 172.16.2.2 command. How will this route appear in the routing table?
C 172.16.1.0 is directly connected, Serial0/0
S 172.16.1.0 is directly connected, Serial0/0
C 172.16.1.0 [1/0] via 172.16.2.2
(*)S 172.16.1.0 [1/0] via 172.16.2.2
39. Refer to the exhibit. The network administrator is testing network connectivity by issuing the tracert command from host A to host B. Given the exhibited output on host A, what are two possible routing table issues on the network? (Choose two.)
Router1 is missing a route to the 172.16.0.0 network
Router1 is missing a route to the 192.168.1.0 network
Router2 is missing a route to the 10.0.0.0 network
(*)Router2 is missing a route to the 172.16.0.0 network
(*)Router3 is missing a route to the 10.0.0.0 network
Router3 is missing a route to the 192.168.0.0 network
40. Refer to the exhibit. All routers in the network are running RIPv2 and EIGRP with default routing protocol settings and have interfaces configured with the bandwidths that are shown in the exhibit. Which protocol will be used and how will traffic between the Router1 LAN and Router5 LAN be routed through the network?
RIPv2 will load balance across both paths between Router1 and Router5.
EIGRP will load balance across both paths between Router1 and Router5.
RIPv2 traffic will use the path Router1, Router2, Router5 because it has the least hops.
(*)EIGRP traffic will use the path Router1, Router3, Router4, Router5 because it has the best metric.
41. Refer to the exhibit. All router interfaces are configured with an IP address and are operational. If no routing protocols or static routes are configured, what information will be included in the show ip route command output for router A?
All of the 192.168.x.0 networks will be in the routing table.
(*)Routes to networks 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24 will be in the routing table.
The routing table will be empty because routes and dynamic routes have not been configured.
A default route is automatically installed in the routing table to allow connectivity between the networks.
42. Refer to the exhibit. What summary address can Router2 advertise to Router1 to reach the three networks on Routers 3, 4, and 5 without advertising any public address space or overlapping the networks on Router1?
172.16.0.0/8
172.16.0.0/10
(*)172.16.0.0/13
172.16.0.0/20
172.16.0.0/24
43. Refer to the exhibit. A new PC was deployed in the Sales network. It was given the host address of 192.168.10.31 with a default gateway of 192.168.10.17. The PC is not communicating with the network properly. What is the cause?
The default gateway is incorrect.
The address is in the wrong subnet.
The host address and default gateway are swapped.
(*)192.168.10.31 is the broadcast address for this subnet.
44. Which of the following could describe the devices labeled "?" in the graphic? (Choose three.)
(*)DCE
(*)CSU/DSU
LAN switch
(*)modem
hub
45. Using default settings, what is the next step in the router boot sequence after the IOS loads from flash?
Perform the POST routine.
Search for a backup IOS in
Load the bootstrap program from ROM.
Load the running-config file from RAM.
(*)Locate and load the startup-config file from NVRAM.
46. Refer to the exhibit. What are the effects of the exhibited commands on the router?
All passwords are encrypted.
Only Telnet sessions are encrypted.
(*)Only the enable password is encrypted.
Only the enable password and Telnet session are encrypted.
Enable and console passwords are encrypted.
47. Refer to the exhibit. A packet enters Router1 with a destination IP of 172.16.28.121. Which routing table entry will be used to forward this packet to the destination address?
172.16.0.0/16 [1/0] via 192.168.0.1
172.16.0.0/20 [1/0] via 192.168.0.9
(*)172.16.16.0/20 [1/0] via 192.168.0.17
0.0.0.0/0 is directly connected, Serial0/0/1
48. Refer to the exhibit. When the show cdp neighbors command is issued from router C, which devices will be displayed in the output?
(*)B, D
A, B, D
D, SWH-2
SWH-1, A, B
SWH-1, SWH-2
A, B, D, SWH-1, SWH-2
49. Refer to exhibit. A company network engineer enters the following commands in the routers:
R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2
R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1
When the engineer enters the show ip route command on R1, the routing table does not display the static route to the 10.1.1.0 network. All R1 and R2 interfaces are correctly addressed per the graphic. What is a logical next step that the engineer could take in order to make the static route display in the routing table in R1?
Enter default routes in R1 and R2.
(*)Enable the R1 and R2 serial interfaces.
Configure the static route to use an exit interface instead of a next-hop address.
Enter the copy run start command to force the router to recognize the configuration.
50. What are three features of CDP? (Choose three.)
(*)tests Layer 2 connectivity
provides a layer of security
operates a OSI layers 2 and 3
(*)enabled by default on each interface
used for debugging Layer 4 connectivity issues
(*)provides information on directly connected devices that have CDP enabled
51. Refer to the exhibit. R1 knows two routes, Path A and Path B, to the Ethernet network attached to R3. R1 learned Path A to network 10.2.0.0/16 from a static route and Path B to network 10.2.0.0/16 from EIGRP. Which route will R1 install in its routing table?
Both routes are installed and load balancing occurs across both paths.
The route via Path B is installed because the EIGRP route has the best metric to network 10.2.0.0/16.
The route via Path A is installed because the static route has the best metric to network 10.2.0.0/16.
The route via Path B is installed because the EIGRP route has the lowest administrative distance to network 10.2.0.0/16.
(*)The route via Path A is installed because the static route has the lowest administrative distance to network 10.2.0.0/16.
52. What command would the network administrator apply to a router that is running OSPF to advertise the entire range of addresses included in 172.16.0.0/19 in area 0?
R1(config-router)# network 172.16.0.0 0.0.0.255 area 0
R1(config-router)# network 172.16.0.0 0.0.3.255 area 0
R1(config-router)# network 172.16.0.0 0.0.15.255 area 0
(*)R1(config-router)# network 172.16.0.0 0.0.31.255 area 0
53. Refer to the exhibit. What will happen if interface Serial0/0/1 goes down on Router1?
The Dijkstra algorithm will calculate the feasible successor.
(*)DUAL will query neighbors for a route to network 192.168.1.0.
Neighbor 172.16.3.2 will be promoted to the feasible successor.
Traffic destined to the 192.168.1.0 network will be dropped immediately due to lack of a feasible successor.
54. Refer to the exhibit. A network administrator is trying to determine why router JAX has no OSPF routes in its routing table. All routers are configured for OSPF area 0. From the JAX router, the administrator is able to ping its connected interfaces and the Fa0/1 interface of the ORL router but no other router interfaces. What is a logical step that the network administrator should take to troubleshoot the problem?
Reboot the routers.
Change the OSPF process ID on all of the routers to 0.
Check to see if the cable is loose between ORL and JAX.
Check to see if CDP packets are passing between the routers.
(*)Use show and debug commands to determine if hellos are propagating.
55. What is the function of the OSPF LSU packet?
used to confirm receipt of certain types of OSPF packets
used to establish and maintain adjacency with other OSPF routers
used to request more information about any entry in the BDR
(*)used to announce new OSPF information and to reply to certain types of requests
56. Refer to the exhibit. Hosts on the BOS Fa0/0 LAN are able to ping the Fa0/1 interface on the JAX router and all interfaces on the BOS and ORL routers. Why would hosts from the 10.0.0.0/24 network not be able to ping hosts on the Fa0/0 LAN of the JAX router?
The JAX router has the wrong process ID.
The JAX router needs the network 10.0.0.0 0.0.0.255 area 0 command.
(*)The JAX router needs the network 192.168.3.0 0.0.0.255 area 0 command.
The BOS router needs the network 192.168.3.0 0.0.0.255 area 0 command.
57. Which three statements about routing protocols are true? (Choose three.)
(*)OSPF elects designated routers on multiaccess links.
RIP does not support classless routing.
(*)EIGRP supports unequal cost load balancing.
EIGRP uses broadcast traffic to establish adjacencies with its neighbors.
(*)RIP does not advertise a route beyond a hop count of 15.
OSPF can convergence more quickly because it can find a feasible successor in its topology table when a successor route goes down.
0 Comment::
Post a Comment