OSPF

OSPF AD number is?

110

In his state, A router has seen its own Router ID in the hello packet from the neighbor. This means that bidirectional communication has been established between the routers.

2-way

OSPF state 2 is called

2-way

What two OSPF ipv4 multicast address are used?

224.0.0.5

This algorithm is used to select the best path from this topological database (LSDB)

Dijkstra

What OSPF command, when configured, will include all interfaces into area 0? A. network 0.0.0.0 255.255.255.255 area 0 B. network 0.0.0.0 0.0.0.0 area 0 C. network 255.255.255.255 0.0.0.0 area 0 D. network all-interfaces area 0

a

What is the OSPF default frequency, in seconds, at which a Cisco router sends hello packets on a multi-access network? A. 10 B. 40 C. 30 D. 20

a

What routing protocol use first-hand information? A. link-state B. distance-vector C. path-vector

a

Which address prefix does OSPFv3 use when multiple IPv6 address are configured on a single interface? A. All prefixes on the interface B. The prefix that the administrator configure for OSPFv3 use C. The lowest prefix on the interface D. The highest prefix on the interface

a

Which one of the following privileged EXEC mode IOS show commands will display the state of the OSPF DR/BDR (designated router / backup designated router) election process? A. CK1 # show ip ospf interface B. CK1 # show ip ospf priority C. CK1 # show ospf neighbor detail D. CK1 # show ospf processes E. CK1 # show ospf neighbor state F. None of the above

a

Which parameter or parameters are used to calculate OSPF cost in Cisco routers? A. Bandwidth B. Bandwidth and Delay C. Bandwidth, Delay, and MTU D. Bandwidth, MTU, Reliability, Delay, and Load

a

Routers have interfaces at least in two areas are called?

abr

Routers connected to an another AS and redistribute external routes are called?

abrs

The OSPF Hello protocol performs which of the following tasks? (Choose two.) A. It provides dynamic neighbor discovery. B. It detects unreachable neighbors in 90 second intervals. C. It maintains neighbor relationships. D. It negotiates correctness parameters between neighboring interfaces. E. It uses timers to elect the router with the fastest links as the designated router. F. It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF.

ac

What information can be used by a router running a link-state protocol to build and maintain its topological database? (Choose two.) A. hello packets B. SAP messages sent by other routers C. LSAs from other routers D. beacons received on point-to-point links E. routing tables received from other link-state routers F. TTL packets from designated routers

ac

What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two) A. hello packets B. SAP messages sent by other routers C. LSAs from other routers D. beacons received on point-to-point links E. routing tables received from other link-state routers F. TTL packets from designated routers

ac

Which is true about OSPF router-id? (Choose two) A. It is used for type 1 router LSA B. router-id needs to be matched on OSPF neighbors C. Highest IP address of the loopback is used D. router-id is 16 bit

ac

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

ac

Which characteristics are representative of a link-state routing protocol? (Choose three.) A. provides common view of entire topology B. exchanges routing tables with neighbors C. calculates shortest path D. utilizes event-triggered updates E. utilizes frequent periodic updates

acd

Certkiller is using OSPF as the routing protocol in their network. What are some of the characteristics of this routing protocol? (Select all valid answer choices) A. It confines network instability to a single area of network. B. It increases the routing overhead of the network C. It supports VLSM D. It routes between Autonomous Systems. E. It allows extensive control of routing updates F. None of the above

ace

Which statements describe the routing protocol OSPF? (Choose three) A. It supports VLSM. B. It is used to route between autonomous systems. C. It confines network instability to one area of the network. D. It increases routing overhead on the network. E. It allows extensive control of routing updates. F. It is simpler to configure than RIP v2.

ace

Which three statements about link-state routing are true? (Choose three.) A. OSPF is a link-state protocol. B. Updates are sent to a broadcast address. C. It uses split horizon. D. Routes are updated when a change in topology occurs. E. RIP is a link-state protocol. F. Updates are sent to a multicast address by default.

adf

OSPF uses this to setup a hierarchical architecture?

area

What can cause two OSPF neighbors to be stuck in the EXSTART state? a. There is a low bandwidth connection between neighbors. b. The neighbors have different MTU settings. c. The OSPF interfaces are in a passive state. d. There is only layer one connectivity between neighbors.

b

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router? A. 2 B. 8 C. 16 D. unlimited

b

When a router undergoes the exchange protocol within OSPF, in what order does it pass through each state? A. exstart state > loading state > exchange state > full state B. exstart state > exchange state > loading state > full state C. exstart state > full state > loading state > exchange state D. loading state > exchange state > full state > exstart state

b

Area 0 is referred to as the __________

backbone

What are two benefits of using a single OSPF area network design? (Choose two.) A. It is less CPU intensive for routers in the single area. B. It reduces the types of LSAs that are generated. C. It removes the need for virtual links. D. It increases LSA response times. E. It reduces the number of required OSPF neighbor adjacencies.

bc

Why do large OSPF networks use a hierarchical design? (Choose three.) A. to decrease latency by increasing bandwidth B. to reduce routing overhead C. to speed up convergence D. to confine network instability to single areas of the network E. to reduce the complexity of router configuration F. to lower costs by replacing routers with distribution layer switches

bcd

OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Choose Three.) A. Each OSPF area requires a loopback interface to be configured. B. Areas may be assigned any number from 0 to 65535. C. Area 0 is called the backbone area. D. Hierarchical OSPF networks do not require multiple areas. E. Multiple OSPF areas must connect to area 0. F. Single area OSPF networks must be configured in area 1

bce

What are three characteristics of the OSPF routing protocol? (Choose three.) A. OSPF is a classful routing protocol. B. It converges quickly. C. It uses cost to determine the best route. D. OSPF routers send the complete routing table to all directly attached routers. E. It uses the DUAL algorithm to determine the best route. F. OSPF routers discover neighbors before exchanging routing information.

bcf

What are two drawbacks of implementing a link-state routing protocol? (Choose two.) a. the sequencing and acknowledgment of link-state packets b. the requirement for a hierarchical IP addressing scheme for optimal functionality c. the high volume of link-state advertisements in a converged network d. the high demand on router resources to run the link-state routing algorithm e. the large size of the topology table listing all advertised routes in the converged network

bd

What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.) A. It requires the use of ARP. B. It can support multiple IPv6 subnets on a single link. C. It supports up to 2 instances of OSPFv3 over a common link. D. It routes over links rather than over networks.

bd

Which commands are required to properly configure a router to run OSPF and to add network 192.168.16.0/24 to OSPF area 0? (Choose two.) A. Router(config)# router ospf 0 B. Router(config)# router ospf 1 C. Router(config)# router ospf area 0 D. Router(config-router)# network 192.168.16.0 0.0.0.255 0 E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0 F. Router(config-router)# network 192.168.16.0 255.255.255.0 area 0

be

Which two statements about the OSPF Router ID are true? (Choose two.) A. It identifies the source of a Type 1 LSA. B. It should be the same on all routers in an OSPF routing instance. C. By default, the lowest IP address on the router becomes the OSPF Router ID. D. The router automatically chooses the IP address of a loopback as the OSPF Router ID.

be

22. What command sequence will configure a router to run OSPF and add network 10.1.1.0 /24 to area 0? A. router ospf area 0 network 10.1.1.0 255.255.255.0 area 0 B. router ospf network 10.1.1.0 0.0.0.255 C. router ospf 1 network 10.1.1.0 0.0.0.255 area 0 D. router ospf area 0 network 10.1.1.0 0.0.0.255 area 0 E. router ospf network 10.1.1.0 255.255.255.0 area 0 F. router ospf 1 network 10.1.1.0 0.0.0.255

c

If all OSPF 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 IP address of the first Fast Ethernet interface B. the IP address of the console management interface C. the highest IP address among its active interfaces D. the lowest IP address among its active interfaces E. the priority value until a loopback interface is configured

c

If the bandwidth of an OSPF interface on a Certkiller router is configured with the "bandwidth 64" command, what would be the calculated cost of the link? A. 1 B. 64 C. 1562 D. 64000 E. 1500 F. None of the above

c

If two OSPF neighbors have formed complete adjacency and are exchanging link-state advertisements, which state have they reached? A. Exstart B. 2-Way C. FULL D. Exchange

c

On what kinds of networks does the OSPF protocol elect a backup designated router? (choose two) A. Point-to-point B. Point to multipoint C. Broadcast D. Non-broadcast multi-access E. None of the above

cd

Which two steps must you perform on each device that is configured for IPv4 routing before you implement OSPFv3? (Choose two) A. configure an autonomous system number B. configure a loopback interface C. configure a router ID D. Enable IPv6 on an interface E. Enable IPv6 unicast routing

ce

The metric that uses bandwidth to determine distance is called?

cost

Which command is used to display the collection of OSPF link states? A. show ip ospf link-state B. show ip ospf lsa database C. show ip ospf neighbors D. show ip ospf database

d

Which command must you enter to enable OSPFV2 in an IPV4 network? A. ip ospf hello-interval seconds B. router ospfv2 process-id C. router ospf value D. router ospf process-id

d

Under which circumstance, i.e. network type, would an OSPF router establish a neighbor adjacency, even though the DR/BDR election process was not performed? A. Virtual Link B. Broadcast multicast C. Nonbroadcast multicast D. Backbone area 0 E. Point-to-point

e

In this state, The routers will send Database Description packets (description of the LDSB). Link State Request packets to request more recent LSAs are also sent in this state.

exchange

OSPF state 4 is called

exchange

In this state, In this state the master/slave relationship is established necessary to exchange Database Description Packets. Since all the packets have their sequence number allowing routers to detect more recent information, initial numbers are negotiated in this state. The router with the highest Router ID becomes the master.

exstart

OSPF state 3 is called

exstart

What two OSPF ipv6 multicast address are used?

ff00::5

In this state, OSPF neighbors are fully adjacent. All information about networks/subnets have been exchanged and acknowledged.

full

OSPF state 6 is called

full

This packet type is used to discover neighbors and maintain the adjacencies between them. More details regarding a hello packet will be presented in the next post.

hello

The _________ value is chosen as the DR.

higher

In this state, A router has heard a hello packet from its neighbor

init

OSPF state 1 is called

init

Routers in a Single Area are called?

internal

If no router ID or Loopback is configured OSPF will use the highest _________________

ip

In this state, The Link State Request packets are sent to neighbors in the loading state. They request more recent LSAs discovered in the Exchange state. Link State Updates are sent in response to LSRs.

loading

OSPF state 5 is called

loading

If no router ID is configured OSPF will use the highest _________________

loopback

This packet is used to acknowledge the reception of all OSPF packets

lsa

This type of packet is used during the exchange state the router creates a list of all missing packets LSA's.

lsr

This type of packet is the response to LSR packets. Contains one or more LSAs which are sent to the neighbor which sent LSR. Upon receiving them the router is flooding them to all its neighbors in order to maintain the same LSDB within the OSPF area.

lsu

A table containing all adjacency's ?

neighboring

The default priority is _________.

one

What OSPF version support IPv6?

ospfv3

DRs are chosen based on the _________ value.

priority

___________ __________ is a 32 bit value, that make that OSPF Router unique in the OSPF network.

router ID

All primary routes are stored in this table?

routing

All primary routes and secondary routes are stored in this table?

topology

If the priority value is set to ________, this router can not be a DR

zero