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WorksheetsOSPF Practice
Total questions: 22
Worksheet time: 13mins
The priority of R1 was modified from the default priority.
True
False
What show command is used to verify neighbor adjacencies of a router?
R1# show ip ospf interface g0/0
R1# show neighbor-table
R1# show ip interface ospf brief
R1# show ip ospf neighbor
R1# show ip interface brief
To avoid sending OSPF router advertisements, you can configure passive interfaces. Which of the following interfaces should be configured as passive? (Choose 3)
loopback interfaces
interfaces connected to other routers
interfaces connected to L2 switches
interfaces connected to an end device (i.e. server)
Which routes should be advertised to other OSPF-enabled routers? (Choose 4)
R1(config-router)# network 192.168.0.0 0.0.0.255 area 0
R1(config-router)# network 10.0.3.72 0.0.0.3 area 0
R1(config-router)# network 10.0.0.0 0.0.0.255 area 0
R1(config-router)# network 10.0.3.64 0.0.0.3 area 0
R1(config-router)# network 10.0.2.0 0.0.0.255 area 0
What is the command to change the priority of a router to control the DR/BDR election process?
R1(config-if)# ip cost ospf 1
R1(config-router)# default-information originate
R1(config-if)# ip priority ospf 100
R1(config-if)# ip ospf priority 255
R1(config-router)# network 0.0.0.0 0.0.0.0 area 0
What is the OSPF all-routers multicast address?
224.0.0.5
224.0.0.6
239.1.1.1
226.0.5.1
255.255.255.254
By default, Hello packet are sent every _______ seconds.
10
15
20
25
30
Which are true regarding single-area OSPF? (choose 3)
all routers are in area 0
all routers are in the backbone area
all routers share the same topology table (link-state database LSDB)
all routers share the same neighbor table (adjacency database)
all routers share the same routing table (forwarding database)
R3 is a . . .
BDR
DROTHER
DR
What is the wildcard mask for a /19 network?
(a)
How many seconds has there been since the last hello message was sent?
7
36
9
27
120
What show command was used to access the information displayed in the image?
R1# show neighbor-table
R1# show ip ospf interface g0/0
R1# show ip ospf neighbor
R1# show ip interface ospf brief
R1# show ip interface brief
How was the DR elected?
based on highest active interface IPv4 address
based on highest router ID
based on highest priority
based on highest loopback interface IPv4 address
If no OSPF DR/BDR election takes place in this scenario, how many adjacencies would be formed? Use the formula for calculating neighbor adjacencies.
3
5
6
9
12
If the OSPF hello interval timer is 20 seconds, what should the dead interval timer be configured as?
10
20
40
80
120
What is the wildcard mask for a /23 network?
(a)
The OSPF-enabled router that has the connection to the ISP is the ASBR (Autonomous System Border Router). How do you advertise the route to the ISP to the other OSPF-enabled routers?
R1(config-if)# ip priority ospf 100
R1(config-router)# network 0.0.0.0 0.0.0.0 area 0
R1(config-router)# default-information originate
R1(config-if)# ip ospf priority 255
R1(config-if)# ip cost ospf 1
What is the highest priority on OSPF-enabled routers?
255
0
32768
120
1
DROTHERS only flood their LSAs to DRs and BDRs. What is the multicast address they use to do this? *
226.0.5.1
239.1.1.1
224.0.0.6
192.168.10.1
224.0.0.5
Hello and dead interval timers do not have to match on neighboring routers to form an adjacency.
True
False
What is the OSPF path cost from R3 to LAN1?
1
2
12
100
11.544
Routers that are not the DR or the BDR are known as ______________
BROTHERS
DROTHERS
OTHERS
