Transcript 20088-2 CCNA3 3.1-02 Questions OSPF

Module 2
Cisco 3 - OSPF
What state are the routers in an OSPF network in after the DR
and BDR are elected
Perrine. J
1.
Exstart
2.
Full
3.
Loading
4.
Exchange
4/2/2016
Page 1
Module 2
Cisco 3 - OSPF
What state are the routers in an OSPF network in after the DR
and BDR are elected
Perrine. J
1.
Exstart
2.
Full
3.
Loading
4.
Exchange
4/2/2016
Page 2
Module 2
Cisco 3 - OSPF
Why would a network administrator choose to enable MD5 authentication for
OSPF exchanges? (Choose three.)
Perrine. J
1.
to prevent OSPF packets from being decoded by unauthorized
individuals using packet sniffers
2.
to reduce OSPF information exchange overhead
3.
to assure that OSPF routing information takes priority over RIP or
IGRP updates
4.
to encrypt routing tables to prevent unauthorized viewing
5.
to ensure that routing information comes from a valid source
6.
to prevent routing information from being falsified
4/2/2016
Page 3
Module 2
Cisco 3 - OSPF
Why would a network administrator choose to enable MD5 authentication for
OSPF exchanges? (Choose three.)
Perrine. J
1.
to prevent OSPF packets from being decoded by unauthorized
individuals using packet sniffers
2.
to reduce OSPF information exchange overhead
3.
to assure that OSPF routing information takes priority over RIP or
IGRP updates
4.
to encrypt routing tables to prevent unauthorized viewing
5.
to ensure that routing information comes from a valid source
6.
to prevent routing information from being falsified
4/2/2016
Page 4
Module 2
Cisco 3 - OSPF
What OSPF packet type establishes and maintains neighbor adjacencies?
Perrine. J
1.
Link-state request
2.
Link-state acknowledgement
3.
Hello
4.
Database description packet
4/2/2016
Page 5
Module 2
Cisco 3 - OSPF
What OSPF packet type establishes and maintains neighbor adjacencies?
Perrine. J
1.
Link-state request
2.
Link-state acknowledgement
3.
Hello
4.
Database description packet
4/2/2016
Page 6
Module 2
Cisco 3 - OSPF
Because of security concerns, a network administrator wants to set up
authentication between two routers. Which of the following commands will
configure Router_A to trust Router_B with a clear text password of apollo?
Perrine. J
1.
Router_A(config-if)# ospf authentication-key apollo
2.
Router_A(config-if)# ip authentication-key apollo
3.
Router_A(config-if)# ip ospf authentication apollo
4.
Router_A(config-if)# ip ospf authentication-key apollo
4/2/2016
Page 7
Module 2
Cisco 3 - OSPF
Because of security concerns, a network administrator wants to set up
authentication between two routers. Which of the following commands will
configure Router_A to trust Router_B with a clear text password of apollo?
Perrine. J
1.
Router_A(config-if)# ospf authentication-key apollo
2.
Router_A(config-if)# ip authentication-key apollo
3.
Router_A(config-if)# ip ospf authentication apollo
4.
Router_A(config-if)# ip ospf authentication-key apollo
4/2/2016
Page 8
Module 2
Cisco 3 - OSPF
What multicast address represents all OSPF routers?
Perrine. J
1.
224.0.0.6
2.
224.0.0.1
3.
224.0.0.4
4.
224.0.0.5
4/2/2016
Page 9
Module 2
Cisco 3 - OSPF
What multicast address represents all OSPF routers?
Perrine. J
1.
224.0.0.6
2.
224.0.0.1
3.
224.0.0.4
4.
224.0.0.5
4/2/2016
Page 10
Module 2
Cisco 3 - OSPF
In which types of networks are OSPF DR elections necessary? (Choose two.)
Perrine. J
1.
point-to-point
2.
point-to-multipoint
3.
broadcast multiaccess
4.
nonbroadcast multiaccess
4/2/2016
Page 11
Module 2
Cisco 3 - OSPF
In which types of networks are OSPF DR elections necessary? (Choose two.)
Perrine. J
1.
point-to-point
2.
point-to-multipoint
3.
broadcast multiaccess
4.
nonbroadcast multiaccess
4/2/2016
Page 12
Module 2
Cisco 3 - OSPF
What is a common feature of NBMA networks?
Perrine. J
1.
Support for only two routers
2.
Support for more than two routers
3.
No election of DRs
4.
Full support for broadcast and multicast packets
4/2/2016
Page 13
Module 2
Cisco 3 - OSPF
What is a common feature of NBMA networks?
Perrine. J
1.
Support for only two routers
2.
Support for more than two routers
3.
No election of DRs
4.
Full support for broadcast and multicast packets
4/2/2016
Page 14
Module 2
Cisco 3 - OSPF
What information can be obtained from the output of the show ip ospf
interface command? (Choose three.)
Perrine. J
1.
link-state age intervals
2.
timer intervals
3.
router ID number
4.
link-state update intervals
5.
neighbor adjacencies
4/2/2016
Page 15
Module 2
Cisco 3 - OSPF
What information can be obtained from the output of the show ip ospf
interface command? (Choose three.)
Perrine. J
1.
link-state age intervals
2.
timer intervals
3.
router ID number
4.
link-state update intervals
5.
neighbor adjacencies
4/2/2016
Page 16
Module 2
Cisco 3 - OSPF
What command allows OSPF routers to exchange routing updates without
multicasts?
Perrine. J
1.
ip ospf neighbor
2.
ospf neighbor
3.
Neighbor
4.
ip neighbor
4/2/2016
Page 17
Module 2
Cisco 3 - OSPF
What command allows OSPF routers to exchange routing updates without
multicasts?
Perrine. J
1.
ip ospf neighbor
2.
ospf neighbor
3.
Neighbor
4.
ip neighbor
4/2/2016
Page 18
Module 2
Cisco 3 - OSPF
Which router is the root of an SPF tree?
Perrine. J
1.
border router
2.
nearest neighboring router
3.
local router
4.
trunk router, as determined by the SPF algorithm
4/2/2016
Page 19
Module 2
Cisco 3 - OSPF
Which router is the root of an SPF tree?
Perrine. J
1.
border router
2.
nearest neighboring router
3.
local router
4.
trunk router, as determined by the SPF algorithm
4/2/2016
Page 20
Module 2
Cisco 3 - OSPF
.1
RTA
1.1.1.1 /32
Backbone or transit area
switch
200.202.16.0/24
.2
.3
.4
RTB
RTC
RTD
2.2.2.2 /32
3.3.3.3 /32
4.4.4.4 /32
Assume each router’s running-configuration contains OSPF default configuration values and
concurrently performs the two-way state process. Which router becomes the Backup Designated
Router?
Perrine. J
1.
RTA
2.
RTB
3.
RTC
4.
RTD
4/2/2016
Page 21
Module 2
Cisco 3 - OSPF
.1
RTA
1.1.1.1 /32
Backbone or transit area
switch
200.202.16.0/24
.2
.3
.4
RTB
RTC
RTD
2.2.2.2 /32
3.3.3.3 /32
4.4.4.4 /32
Assume each router’s running-configuration contains OSPF default configuration values and
concurrently performs the two-way state process. Which router becomes the Backup Designated
Router?
Perrine. J
1.
RTA
2.
RTB
3.
RTC
4.
RTD
4/2/2016
Page 22
Module 2
Cisco 3 - OSPF
Which of the following are disadvantages of link-state routing? (Choose
three.)
Perrine. J
1.
Link-state protocols require careful network design.
2.
Link-state protocols are prone to routing loops.
3.
Link-state hello updates can cause broadcast flooding.
4.
Link-state protocols place significant demands on router processors
and memory resources.
5.
Link-state protocols require a knowledgeable network administrator.
6.
Link-state protocols do not support Variable Length Subnet Masking
4/2/2016
Page 23
Module 2
Cisco 3 - OSPF
Which of the following are disadvantages of link-state routing? (Choose
three.)
Perrine. J
1.
Link-state protocols require careful network design.
2.
Link-state protocols are prone to routing loops.
3.
Link-state hello updates can cause broadcast flooding.
4.
Link-state protocols place significant demands on router
processors and memory resources.
5.
Link-state protocols require a knowledgeable network
administrator.
6.
Link-state protocols do not support Variable Length Subnet Masking
4/2/2016
Page 24
Module 2
Cisco 3 - OSPF
Assuming that the network has converged, which of the following is true regarding
the link-state database held by each router that is in the same OSPF area. ?
1.
The link-state database is stored in a designated router and is accessed
by each router in the area as needed.
2.
Each router in an OSPF area has a link-state database containing the
same status information.
3.
Each router has a different link-state database depending on its location
within the network.
4.
The link-state database in each router only contains information about
adjacent routers and the status of their links
Perrine. J
4/2/2016
Page 25
Module 2
Cisco 3 - OSPF
Assuming that the network has converged, which of the following is true regarding
the link-state database held by each router that is in the same OSPF area. ?
1.
The link-state database is stored in a designated router and is accessed
by each router in the area as needed.
2.
Each router in an OSPF area has a link-state database containing
the same status information.
3.
Each router has a different link-state database depending on its location
within the network.
4.
The link-state database in each router only contains information about
adjacent routers and the status of their links
Perrine. J
4/2/2016
Page 26
Module 2
Cisco 3 - OSPF
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?
Perrine. J
1.
Router_A(config-router)# ospf redistribute default-route
2.
Router_B(config-router)# ospf redistribute default-route
3.
Router_A(config-router)# default-information originate
4.
Router_B(config-router)# default-information originate
5.
Router_A(config-router)# ip ospf update-default
6.
Router_B(config-router)# ip ospf update-default
4/2/2016
Page 27
Module 2
Cisco 3 - OSPF
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?
Perrine. J
1.
Router_A(config-router)# ospf redistribute default-route
2.
Router_B(config-router)# ospf redistribute default-route
3.
Router_A(config-router)# default-information originate
4.
Router_B(config-router)# default-information originate
5.
Router_A(config-router)# ip ospf update-default
6.
Router_B(config-router)# ip ospf update-default
4/2/2016
Page 28