OSPF is configured over a Frame Relay network as shown in the exhibit. 
All PVCs are active. However, R1 and R3 fail to see all OSPF routes in their routing tables. The show ip
ospf neighbor command executed on R2 shows the state of the neighbors.
What should be done to fix the problem?
A.
The ip ospf network broadcast command should be configured on each Frame Relay
interface.
B.
The ip ospf network non-broadcast command should be configured on each Frame Relay
interface.
C.
The ip ospf priority value on the spoke routers should be set to 0.
D.
The ip ospf priority value on the hub router should be set to 0.
E.
The neighbor command should be configured under the OSPF routing process on all
routers.
Setting Priority to 0 will just force R2 to be the DR.
to “work” these would need to be set as two separate Point-to-point with sub-int
or as a “point-to-multipoint non-broadcast”
forcing all multicast traffic to be uni-cast instead.
in which case both C & E are used to manually define Neighbors
Please someone clarify for me how forcing R2 to be the DR would fix routing?
•Hub-and-spoke environments should elect the hub as the DR or use point-to-point subinterfaces – which don’t require a DR
http://www.ccnpguide.com/ccnp-route-642-902-ospf/
NEVERMIND: i found my answer.
FR is broadcast…..DR are elected and multicast works.
in a point-to-multipoint like this…it makes sense to just force the hub to be DR in order to allow it to push route update LSA to the spokes.
Since the DR (the hub) sees the two spokes…it will tell them each about the other and it will work.
–
You cant predict your spokes will have full visibility of the other spokes because of your frame relay topology. You set the spokes priorities to 0 so they cannot be DR or BDR. The Hub router assumes the BDR has full visibility of the network (it doesnt !) so as long as the BDR exists, it remains passive and listen for traffic from the DR. By having no BDR, the DR will send LSU updates to all the spokes !
(2/Nov/2017 Updated) New 300-101 Exam Questions:
NEW QUESTION 463
What is the minimum privilege level to enter all commands in usermode?
A. Level14
B. Level0
C. Level1
D. Level15
Answer: C
NEW QUESTION 464
Refer to the exhibit. How can you configure a second export destination for IP address 192.168.10.1?
configure terminal
ip flow-export destination 192.168.10.1 9991
ip flow-export version 9
A. specify a different TCP port
B. specify a different UDP port
C. specify a VRF
D. configure a version 5 flow-export to the same destination
E. specify a different flow ID
Answer: C
NEW QUESTION 465
Which value does Frame Relay use to identify a connection between a DTE and DCE?
A. DLCI
B. IP address
C. MAC address
D. VLAN ID
Answer: A
NEW QUESTION 466
Which two options are limitations of Stateful NAT64? (Choose two.)
A. it is unable to route VRF traffic
B. it is unable to route multicast traffic
C. it supports FTP traffic only with an ALG
D. it supports DNS64 only
E. layer 4 supports TCP only
Answer: AB
NEW QUESTION 467
If you want to migrate an IS-IS network to another routing protocol with ……? (Choose two.)
A. UDP
B. Internal BGP
C. TCP/IP
D. EIGRP
E. OSPF
F. RIP
Answer: DE
NEW QUESTION 468
IP CEF load-sharing options ……? (Choose three.)
A. Tunnel
B. Universal
C. Include-ports
D. Source
E. Destination
Answer: ABC
NEW QUESTION 469
……
NEW QUESTION 470
Which two statements about password-protecting device access are true? (Choose two)
A. The more system:running-config command displays encrypted passwords in clear text.
B. The service password-encryption command forces a remote device to encrypt the password.
C. A network administrator can recover an encrypted password.
D. The privilege level command controls the commands a specific user can execute.
E. The password can be encrypted in the running configuration.
Answer: DE
NEW QUESTION 471
Frame Relay LMI autosense. Which statements are true? (Choose two.)
A. Line should be up and protocol should be down.
B. Protocol must be up.
C. It only works on DTEs.
D. It only works on DCEs.
Answer: AC
NEW QUESTION 472
Which two protocols can cause TCP starvation? (Choose two.)
A. TFTP
B. SNMP
C. SMTP
D. HTTPS
E. FTP
Answer: AB
NEW QUESTION 473
……
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