1. Refer to the exhibit. All routers are running OSPF. What
cost would JAX put in its routing table for the 10.0.0.0/24 network?
1787
2. Refer to the exhibit. Router1 and Router2 are running
OSPF. The show ip ospf neighbor command reveals no neighbors. What is a
possible cause?
OSPF hello or dead timers do not match.
3. A fully converged five router OSPF network has been
running successfully for several weeks. All configurations have been saved and
no static routes are used. If one router looses power and reboots, what
information will be in its routing table after the configuration file is loaded
but before OSPF has converged?
Directly connected networks that are operational will be in
the routing table.
4. Refer to the exhibit. What configuration statements would
give the results that are shown in the output of the show ip protocols command?
B(config)# router ospf 1
B(config-router)# router-id 192.168.1.5
5. Refer to the exhibit. When OSPF is operational in the
exhibited network, what neighbor relationship is developed between Router1 and
Router2?
A FULL adjacency is formed.
6. What does OSPF use to calculate the cost to a destination
network?
bandwidth
7. Refer to the exhibit. The routers in the exhibit are
using default OSPF configuration settings to advertise all attached networks.
If all of the routers start at the same time, what will be the result of the DR
and BDR elections for this single area OSPF network? (Choose three.)
Router A will be DR for 10.4.0.0/16.
HQ will be BDR for 10.4.0.0/16.
Remote will be DR for 10.5.0.0/16.
8. What does OSPF use to reduce the number of exchanges of
routing information in networks where large numbers of neighbors are present?
(Choose two.)
designated router
backup designated router
9. Refer to the exhibit. All routers have been configured
with the interface priorities that are shown. All routers were restarted
simultaneously. The results of the DR/BDR election are shown. What can be
concluded about this network?
The highest router ID was most likely determined via an OSPF
router-id statement or statements.
10. Refer to the exhibit. Router A is correctly configured
for OSPF. Which OSPF configuration statement or set of statements was entered
for router B to generate the exhibited routing table?
B(config-router)# network 192.168.1.0 0.0.0.3 area 0
11. Refer to the exhibit. Assuming that the routers have
default interface OSPF priorities and no configured loopback interfaces, what
two roles will router B play on each network segment? (Choose two.)
DR for network 192.168.1.200
BDR for network 192.168.1.204
12. Refer to the exhibit. Routers A, B, C, and D are all
running OSPF with default router IDs and OSPF interface priorities. Loopback
interfaces are not configured and all interfaces are operational. Router D is
the DR and router C is the BDR. What happens immediately after the following
commands are entered on router A? A(config)# interface fa0/0
A(config-if)# ip ospf priority 255
D will remain the DR. C will remain the BDR.
13. What range of networks will be advertised in the OSPF
updates by the command Router1(config-router)# network 192.168.0.0 0.0.15.255
area 100?
192.168.0.0/24 through 192.168.15.0/24
14. Refer to the exhibit. RouterA, RouterB, and RouterC in
the diagram are running OSPF on their Ethernet interfaces. Router D was just
added to the network. Routers are configured with the loopback interfaces (Lo
0) that are shown in the exhibit. What happens to the OSPF DR/BDR after RouterD
is added to the network?
There is no change in the DR or BDR until either current DR
or BDR goes down.
15. Refer to the exhibit. How many OSPF adjacencies must be
formed to build the complete topology if a DR or BDR were not elected in this
OSPF network?
6
16. What is the default administrative distance for OSPF?
110
17. Refer to the exhibit. Which command sequence on RouterB
will redistribute a gateway of last resort to the other routers in OSPF area 0?
RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# default-information originate
18. Which two statements describe the use of OSPF DR/BDR
elections? (Choose two.)
Elections are required in broadcast multiaccess networks.
Elections are sometimes required in NBMA networks.
19.
Refer to the exhibit. What does the “2″ stand for
in the router ospf 2 statement?
The number 2 identifies this particular instance of OSPF on
this router.
20. Refer to the exhibit. The network administrator wants to
set the router ID of Router1 to 192.168.100.1. What steps can the administrator
take to accomplish this?
nothing, the router-id of Router1 is already 192.168.100.1
21. Refer to the exhibit. What must be received between
neighbors to prevent the dead time that is shown in the exhibit from reaching
zero?
hello packets
22. Refer to the exhibit. What does the “O*E2″ from the
“O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34, Serial0/0″ line
represent?
an external OSPF route that will not increment in cost.
23. Refer to the exhibit. Which network command or set of
commands will cause OSPF to be enabled for any R1 interface connected to the
exhibited subnets?
R1(config-router)# network 10.1.0.0 0.0.0.255 area 0
R1(config-router)# network 10.1.1.0 0.0.0.255 area 0
R1(config-router)# network 10.1.2.4 0.0.0.3 area 0
24. Refer to the exhibit. What is the cost of the route to
the 10.0.0.0 network?
1786
25. What three parameters must be indentical between OSPF
routers in order to form an adjacency? (Choose three.)
area id
hello interval
network type
CCNA 2 Chapter 11 Answers |
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