OSPF Quiz Submissions 2 PDF

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Quiz Submissions - OSPFv2 Chapter Quiz Sachin Mahajan (username: maha0124) Attempt 1 Written: May 28, 2021 10:49 PM - May 28, 2021 11:12 PM Submission View Your quiz has been submitted successfully. 1 / 1 point By default, what is the OSPF cost for any link with a bandwidth of 100 Mb/s or greater? 1 100 1000 10 Question 2

1/1 point

R1, R3 are connected by their Gig0/0 via a Switch, R1 is connected via a Serial link to customer router CE. Based on the topology configurations below, what would be the Designated router (DR) for network 192.168.10.0/24 Use None if none is needed.

192.168.10.2

3.3.3.3

192.172.101.2

None

1/1 point

Question 3 Which Two (2) statements are true regarding link-state routing protocols, (choose 2: )? updates are sent when there is a change in the network topology the metric is based on the hop count to determine the best path they are aware of the complete network topology they automatically propagate a default route to neighbor routers

1/1 point

Question 4 Which OSPF component is associated with the topology table? forwarding database Dijkstra's algorithm routing protocol updates Link-state database

1/1 point

Question 5 Which parameter is used to calculate the default OSPF metric (cost)? reliability delay hop count load bandwidth

1/1 point

Question 6

Customer enabled OSPF on Router R2 with no RID manually configured, based on the configuration below, what would be the router ID (RID)?

Answer: 11.11.11.11 Question 7

1/1 point

An administrator is configuring single-area OSPF on a router. One of the OSPF networks that must be advertised is 18.70.7.0 255.255.255.128. What is the wildcard mask that the administrator use in the OSPF network statement? 0.0.255.255 0.255.255.255 0.0.0.127 0.0.0.255 1/1 point

Question 8

if a router participates in 3 Ethernet Segments (3 IP subnets), How many DR elections will be for the Ethernet segments? 1 3 none 6 Question 9

1/1 point

Assume in an OSPF network there are multiple paths to reach destinations with different link bandwidths , Which OSPF path to a destination network will be chosen by the SPF algorithm? All paths will be used regardless of the link bandwidths The path that includes the slowest links bandwidth The path with the least cost that is calculated based on fastest link bandwidth The path with the least number of hops 1/1 point

Question 10

Customer wants to enable OSPF on network 10.125.8.0/22 what will be the wild card mask that will only advertise this subnet? Answer:

0.0.3.25 5

Question 11

1/1 point

Router R2 has enabled OSPF, no router-id has been configured. Based on the output below, write down the router ID for R2?

Answer: 219.100.113.1 Question 12

1/1 point

Which statements are true regarding DR and BDR election on Multiaccess network, Choose all that apply? DR and BDR election is preemptive There is no BDR election on Multiaccess network only DR election If OSPF priority is set to 0 then router is not eligible to become DR or BDR Highest OSPF priority is 255

Default OSPF priority for broadcast network type is 1 DR and BDR election is non-preemptive Question 13

1/1 point

After modifying the RID, what OSPF command is needed to activate the new value without reloading the router? router reload shut then no shut for all interfaces clear ip ospf process shut then no shut for loopback address Question 14

1/1 point

The OSPF hello timer has been set to twice its default value on a router in a point-to-point network. By default, what is the dead interval on this router? 80 seconds 40seconds 20 seconds 100 seconds Question 15

1/1 point

Which command is most useful to verify that OSPF is enabled and also provides a list of the networks that are being advertised by the network? show ip ospf interface show ip route ospf show ip ospf database

show ip protocols Question 16

1/1 point

To establish a neighbor adjacency two OSPF routers will exchange hello packets. Which Two (2) values in the hello packets must match on both routers, (Choose 2:)? dead interval hello interval list of neighbors router ID Question 17

1/1 point

With default timers on a Ethernet interface, OSPF presumes a neighbor is unavailable after how many seconds with no hello messages received? 10 60 15 40 Question 18

1/1 point

Customer enabled OSPFve Single area (area 0) in network, Router R1 is configured with OSPFv2 with Process ID 5, which statement is true regarding the OSPF process ID? All routers in network must use the same OSPF process ID OSPF process ID is locally significant OSPF process ID should be different on each router in the network Process ID should match OSPF area number, so all routers should be configured with the same Process ID 5

Question 19

1/1 point

Which metric is used by RIP? bandwidth hop count delay MTU Question 20

1/1 point

What are two (2) reasons that will prevent two routers from forming an OSPFv2 neighbor adjacency, (Choose 2 :)? one router connecting to a FastEthernet port on the switch and the other connecting to a GigabitEthernet port mismatched Hello timers use of private IP addresses on the link interfaces mismatched dead timers Question 21

1/1 point

An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.223.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network? 0.0.255.255 0.0.15.255 0.0.0.255 0.0.3.255

Question 22

1/1 point

What indicates to an OSPF router that a neighbor is still reachable? hello packets are used to maintain neighbor adjacency if the router receives an LSU with an expired sequence number if the router no longer receives routing updates if the router does not receive an ACK to a hello message Question 23

1/1 point

What function is performed by an OSPF designated router? LSAs dissemination maintains the neighbour table for a multi-access segment maintains the link-state-database for a multi-access segment propagates default routes Question 24

1/1 point

R1 and R2 routers are connected via Gigabit Ethernet link, and only the 2 routers are connected over the Gigabit segment, which command can be used to avoid DR and BDR election on the segment? ip ospf network point-to-point under router ospf process ip ospf network point-to-point Gigabit interface command ip ospf network broadcast Gigabit interface command ip ospf network broadcast under router ospf process Question 25 Which two OSPF commands can adjust the OSPF cost for an interface, (Choose 2:) ?

1/1 point

ip ospf cost under interface auto-cost reference-bandwidth under router ospf bandwidth under router ospf there is no such command Question 26

1/1 point

What is the OSPF reference bandwidth in Mbps value that can distinguish between OSPF cost of 1Gbps and 10Gbps link speeds? 100 10000 1 10 Question 27

1/1 point

R1, R2, R3 and R4 are connected to a centrally located switch using their Gig0/0 connection as shown in the topology below.

Based on the above router configuration, What would be the router-id of the designated router? Use None if none is needed. 255 3.3.3.3 1.1.1.1 172.16.8.1 1.5 / 1.5 points

Question 28 What statement in not correct regarding OSPF DR/BDR election process?

Router that is configured with OSPF priority 0 cannot be elected as a DR or BDR DR/BDR election occurs per Ethernet Segment,

DR is responsible to disseminate LSAs for multiaccess network

DR election process is preemptive Question 29

0.6 / 0.6 points

Customer enabled OSPFv2 in the network on Router R1 based on the configuration below, the output shown the links that are operational. Based on the configuration and show command out, which networks will be advertised by OSPF, (Choose all that apply)?

192.168.13.0/24 10.10.10.10/32 192.168.10.0/24 No networks will be advertised due to passive interface command Question 30

1/1 point

Which Two (2) statements properly describe OSPFv3, (Choose 2: )? OSPFv3 runs an independent process for IPv6 OSPFv3 populates an IPv6 routing table OSPFv3 runs the same process like OSPFv2 OSPFv3 does not use Dijkstra algorithm Question 31

1/1

point Which table is identical on all OSPF routers in a single area? the topology table the neighbor table the routing table the external route table 1/1 point

Question 32

R1, R2, R3 and R4 are connected to a centrally located switch using their Gig0/0 connection. The routers have the configurations as shown in the topology and all their interfaces are up/up. Based on the configuration, what will be the RID for the DR?

Answer: 2.2.2.2 Question 33

1/1 point

Customer enabled OSPF based on the configurations and topology below. Loopback 0 of Router R1 is shutdown, all other interfaces are in UP/UP state,what will be the router ID (RID) of DR?

Answer: 1.1.1.1 Question 34

0/1 point

After OSPFv2 neighbors are established and LSAs are exchanged. How will routers use the learned LSAs to choose which IP routes to add to its IP routing table? Routers will execute Disjkstra algorithm and use the SPF calculations based on LSAs to calculate best path to reach a destination

Routers do not use the LSAs at all when choosing what routes to add in the routing table All LSAs and all possible paths will be added to routing table Routers will use the hop count information in LSAs to compute the best path Question 35

1/1 point

Which router ospf command will distinguish between cost of the 10Gbit interface and 1Gbit interface? auto-cost reference bandwidth 100 On the 10Gbit interface: (config-if)# bandwidth 1000 On the 1Gbit interface: (config-if)# ip ospf cost 1 auto-cost reference bandwidth 10000 Question 36

1/1 point

R1 and R2 routers are connected via a Serial point to point link and OSPFv2 is configured on the link. Link is in UP/UP state, how will the Backup Designated Router (BDR) for the serial link will get elected?

The DR will be the router with the highest OSPF interface priority on the Serial interface There is no BDR election on the Serial link The DR will be the router with the highest IP address on the Serial link The DR will be the router with the highest router ID on the Serial link Question 37

1/1 point

In an OSPF Multiaccess network what is the mechanism used by OSPF to reduce LSA flooding to all OSPF neighbors? there is no mechanism to reduce LSA flooding on Multiaccess networks automatic conversion of ethernet links to point-to-point networks DR and BDR election per Ethernet segment LSA flooding to all neighbors Question 38

1/1 point

Which OSPF verification command will identify specific interfaces configured with the passiveinterface command? show ip route ospf show ip protocols show ip interface brief show ip ospf neighbor Question 39 Which of the following OSPF neighbor states the DR and BDR elections is expected ? DR/BDR

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Exchange 2-Way Full Question 40

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Which state is expected when the exchange of topology information is complete? 2 WAY FULL Exchange Loading Question 41

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Which method is recommended for setting an OSPFv2 router-id (RID)? Assign the highest priority to the router interface with the lowest ip address Assign the lowest priority to the router interface with the highest ip address Any method of setting the router-id will work Create a loopback interface and assign it as the router ID (RID) Question 42

1/1 point

Which Multicast addresses is used on Multi-access network to communicate with DR and BDR? 224.0.0.10 224.0.0.5

224.0.0.13 224.0.0.6 1/1 point

Question 43

Customer wants to enable OSPF in network, one of subnets that must be advertised is 188.65.4.0 255.255.255.192, what will be the wild card mask? Answer: 0.0.0.63 Question 44

0/1 point

Customer has 2 networks that need to be advertised in OSPF area 10 192.168.10.0/25 205.165.200.0/27 What will be the OSPF command to advertise only network 205.165.200.0/27? Answer: network 2.5.165.200.0 0.0.0.31 area 10 Question 45

(network 205.165.200.0 0.0.0.31 area 10) 1/1 point

R1,R2,R3 are enabled with OSPFv2 single area via a switch as shown in the topology and based on the configurations below, assume all interfaces are in UP/UP state, what will be the RID for the DR router?

Answer: 33.33.33.33 Question 46

1/1 point

Customer enabled OSPF on routers, router RA sample configuration is shown below. Assume that all links have been advertised in OSPF, however links associated with subnets 192.168.10.0/24 and 192.168.20.0/24 are in UP/Down state. Which OSPF networks will be advertised by RA to its neighbors, Choose all that apply? RA#show run | section ospf ! router ospf 1 log-adjacency-changes passive-interface default no passive-interface GigabitEthernet0/0 network 199.9.9.8 0.0.0.0 area 0 network 205.211.40.1 0.0.0.0 area 0 network 192.168.10.1 0.0.0.0 area 0 network 192.168.20.1 0.0.0.0 area 0 No networks will be advertised due to passive interface default command 199.9.9.0/24 All networks will be advertised even if the links are in UP/Down or Down/Down state 205.211.40.0/24 Question 47

1/1 point

Which type of OSPFv2 packet contains an abbreviated list of the LSDB of a sending router and is used by receiving routers to synchronize the local LSDB? LSR DBD LSA LSU Question 48

1/1 point

What is the router OSPF command to adjust reference bandwidth so it can distinguish the OSPF cost between 100Mbps and 1Gbps link speeds?

auto-cost reference-bandwidth 100

auto-cost reference-bandwidth 1000

auto-cost reference-bandwidth 10

auto-cost reference-bandwidth 1

Question 49

1/1 point

Which Two (2) parameters must match in order for a pair of routers to become OSPFv2 neighbours, (Choose 2:) ? Hello and Dead interval timers the interface priority OSPF network type OSPF process IDs Question 50

1/1 point

R1, R2, R3 and R4 are connected to a centrally located switch using their Gig0/0 connection. The routers have the following configuration and all their interfaces are in Up/Up state. Based on the configuration what would be the RID for DR?

Answer: 192.168.10.1 Question 51

1/1 point

Which are Two (2) transit OSPF states, (Choose 2 :)? Full 2 Way Exstart Exchange Question 52 Which OSPF database is associated with the neighbour table? an adjacency database

1/1 point

a designated router database a backup route database an interface cost database Question 53

1/1 point

Which protocol OSPF is based on? OSPF is a UDP protocol. OSPF is a TCP protocol. OSPF uses only broadcast messaging OSPF does not use a transport protocol but encapsulates its data directly in IP packets using protocol number 89 Question 54

1/1 point

Which step in the link-state routing process is described by a router sending Hello packets out all of the OSPF-enabled interfaces? electing the designated router injecting the default route establishing neighbor adjacencies exchanging LSAs Question 55 Which OPSF packet contains the different types of LSAs? DBD LSR Hello

1/1 point

LSU 1/1 point

Question 56 Which are Two (2) stable states in OSPF, (Choose 2:) ? Exchange Full Loading 2 WAY

1/1 point

Question 57

An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 198.19.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement? 0.0.0.255 0.255.255.255 0.0.255.255 0.0.3.255 Question 58

0.9 / 0.9 points

Which Two (2) commands router ospf commands are required on Router R1 to propagate a default route to its OSPF neighbors. Assume that R1 is connected to ISP router via Serial interface 0/0/0 and the next hop address of ISP router is 209.165.200.2, (Choose 2:) ? ip route 0.0.0.0 0.0.0.0 209.165.200.2 default-information originate propagate default route

ip route ::/0 default route

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