A backup designated router needs to be added to the network

A backup designated router needs to be added to the network

There are three possible routes for a router to reach a destination network. The first route is from OSPF with a metric of 782. The second route is from RIPv2 with a metric of 4. The third is from EIGRP with a composite metric of 20514560. Which route will be installed by the router in its routing table?

A. RIPv2

B. EIGRP

C. OSPF

D. All three

 

·         B. Only the EIGRP routes will be placed in the routing table because it has the lowest administrative distance (AD), and that is always used before metrics.

 

Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two.)

A. It is locally significant.

B. It is globally significant.

C. It is needed to identify a unique instance of an OSPF database.

D. It is an optional parameter required only if multiple OSPF processes are running on the router.

E. All routes in the same OSPF area must have the same process ID if they are to exchange routing information.

 

·         A, C. The process ID for OSPF on a router is only locally significant and you can use the same number on each router, or each router can have a different number it just doesnt matter. The numbers you can use are from 1 to 65,535. Dont get this confused with area numbers, which can be from 0 to 4.2 billion.

 

All of the following must match for two OSPF routers to become neighbors except which?

A. Area ID

B. Router ID

C. Stub area flag

D. Authentication password if using one

 

·         B. The router ID (RID) is an IP address used to identify the router. It need not and should not match.

 

You get a call from a network administrator who tells you that he typed the following into his router:

Router(config)#router ospf 1
Router(config-router)#network 10.0.0.0 255.0.0.0 area 0
He tells you he still cant see any routes in the routing table. What configuration error did the administrator make?

A. The wildcard mask is incorrect.

B. The OSPF area is wrong.

C. The OSPF process ID is incorrect.

D. The AS configuration is wrong.

 

·         The administrator typed in the wrong wildcard mask configuration. The wildcard should have been 0.0.0.255 or even 0.255.255.255.

 

Which of the following statements is true with regard to the output shown?

Corp#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
172.31.1.4 1 FULL/BDR 00:00:34 10.10.10.2 FastEthernet0/0
192.168.20.1 0 FULL/ - 00:00:31 172.16.10.6 Serial0/1
192.168.10.1 0 FULL/ - 00:00:32 172.16.10.2 Serial0/0
A. There is no DR on the link to 192.168.20.1.

B. The Corp router is the BDR on the link to 172.31.1.4.

C. The Corp router is the DR on the link to 192.168.20.1.

D. The link to 192.168.10.1 is Active.

 

·         A dash (-) in the State column indicates no DR election, because they are not required on a point-to-point link such as a serial connection.

 

What is the administrative distance of OSPF?

A. 90

B. 100

C. 120

D. 110

 

·         D. By default the administrative distance of OSPF is 110.

 

In OSPF, Hellos are sent to what IP address?

A. 224.0.0.5

B. 224.0.0.9

C. 224.0.0.10

D. 224.0.0.1

 

·         Hello packets are addressed to multicast address 224.0.0.5.

 

What command generated the following output?

172.31.1.4 1 FULL/BDR 00:00:34 10.10.10.2 FastEthernet0/0
192.168.20.1 0 FULL/ - 00:00:31 172.16.10.6 Serial0/1
192.168.10.1 0 FULL/ - 00:00:32 172.16.10.2 Serial0/0
A. show ip ospf neighbor

B. show ip ospf database

C. show ip route

D. show ip ospf interface

 

·         The show ip ospf neighbor command displays all interface-related neighbor information. This output shows the DR and BDR (unless your router is the DR or BDR), the RID of all directly connected neighbors and the IP address and name of the directly connected interface.

 

Updates addressed to 224.0.0.6 are destined for which type of OSPF router?

A. DR

B. ASBR

C. ABR

D. All OSPF routers

 

·         224.0.0.6 is used on broadcast networks to reach the DR and BDR.

 

For some reason, you cannot establish an adjacency relationship on a common Ethernet link between two routers. Looking at this output, what is the cause of the problem?

RouterA#
Ethernet0/0 is up, line protocol is up
Internet Address 172.16.1.2/16, Area 0
Process ID 2, Router ID 172.126.1.2, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 172.16.1.2, interface address 172.16.1.1
No backup designated router on this network
Timer intervals configured, Hello 5, Dead 20, Wait 20, Retransmit 5

RouterB#
Ethernet0/0 is up, line protocol is up
Internet Address 172.16.1.1/16, Area 0
Process ID 2, Router ID 172.126.1.1, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 172.16.1.1, interface address 172.16.1.2
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
A. The OSPF area is not configured properly.

B. The priority on RouterA should be set higher.

C. The cost on RouterA should be set higher.

D. The Hello and Dead timers are not configured properly.

E. A backup designated router needs to be added to the network.

F. The OSPF process ID numbers must match.

 

·         D. The Hello and Dead timers must be set the same on two routers on the same link or they will not form an adjacency (relationship). The default timers for OSPF are 10 seconds for the Hello timer and 40 seconds for the Dead timer.

 

Type the command that will disable OSPF on the Fa0/1 interface under the routing process. Write only the command and not the prompt.

 

·         passive-interface fastEthernet 0/1 The command passive-interface fastEthernet 0/1 will disable OSPF on the specified interface only.

 

Which two of the following commands will place network 10.2.3.0/24 into area 0? (Choose two.)

A. router eigrp 10

B. router ospf 10

C. router rip

D. network 10.0.0.0

E. network 10.2.3.0 255.255.255.0 area 0

F. network 10.2.3.0 0.0.0.255 area0

G. network 10.2.3.0 0.0.0.255 area 0

 

·         B, G. To enable OSPF, you must first start OSPF using a process ID. The number is irrelevant; just choose a number from 1 to 65,535 and you’re good to go. After you start the OSPF process, you must configure interfaces on which to activate OSPF using the network command with wildcards and specification of an area. Option F is wrong because there must be a space after the parameter area and before you list the area number.

 

Given the following output, which statement or statements can be determined to be true? (Choose all that apply.)

RouterA2# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
192.168.23.2 1 FULL/BDR 00:00:29 10.24.4.2 FastEthernet1/0
192.168.45.2 2 FULL/BDR 00:00:24 10.1.0.5 FastEthernet0/0
192.168.85.1 1 FULL/- 00:00:33 10.6.4.10 Serial0/1
192.168.90.3 1 FULL/DR 00:00:32 10.5.5.2 FastEthernet0/1
192.168.67.3 1 FULL/DR 00:00:20 10.4.9.20 FastEthernet0/2
192.168.90.1 1 FULL/BDR 00:00:23 10.5.5.4 FastEthernet0/1
<<output omitted>>
A. The DR for the network connected to Fa0/0 has an interface priority higher than 2.

B. This router (A2) is the BDR for subnet 10.1.0.0.

C. The DR for the network connected to Fa0/1 has a router ID of 10.5.5.2.

D. The DR for the serial subnet is 192.168.85.1.

 

·         The default OSPF interface priority is 1, and the highest interface priority determines the designated router (DR) for a subnet. The output indicates that the router with a router ID of 192.168.45.2 is currently the backup designated router (BDR) for the segment, which indicates that another router became the DR. It can be then be assumed that the DR router has an interface priority higher than 2. (The router serving the DR function is not present in the truncated sample output.)

 

What are three reasons for creating OSPF in a hierarchical design? (Choose three.)

A. To decrease routing overhead

B. To speed up convergence

C. To confine network instability to single areas of the network

D. To make configuring OSPF easier

 

·         A, B, C. OSPF is created in a hierarchical design, not a flat design like RIP. This decreases routing overhead, speeds up convergence, and confines network instability to a single area of the network.

 

Type the command that produced the following output. Write only the command and not the prompt.

FastEthernet0/0 is up, line protocol is up
Internet Address 10.10.10.1/24, Area 0
Process ID 1, Router ID 223.255.255.254, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 223.255.255.254, Interface address 10.10.10.1
Backup Designated router (ID) 172.31.1.4, Interface address 10.10.10.2
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:08
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 3/3, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 172.31.1. Suppress hello for 0 neighbor(s)

 

·         show ip ospf interface The show ip ospf interface command displays all interface-related OSPF information. Data is displayed about OSPF information for all OSPF-enabled interfaces or for specified interfaces.

 

A(n) ____________is an OSPF data packet containing link-state and routing information that are shared among OSPF routers.

A. LSA

B. TSA

C. Hello

D. SPF

 

·         show ip ospf interface The show ip ospf interface command displays all interface-related OSPF information. Data is displayed about OSPF information for all OSPF-enabled interfaces or for specified interfaces.

 

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF router ID in the absence of a loopback interface?

A. The lowest IP address of any physical interface

B. The highest IP address of any physical interface

C. The lowest IP address of any logical interface

D. The highest IP address of any logical interface

 

·         20. B. At the moment of OSPF process startup, the highest IP address on any active interface will be the router ID (RID) of the router. If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.