Chapter 7
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7.1.6
1 - To properly configure link-state routing, which of the following is mandatory within an area?
Backbone
2
-You are currently using EIGRP on your network. Which of the following would you gain by switching to
OSPF?
Hierarchical network design AND Open standard
3 - You have configured Router A, Router B, and Router C as shown. No loopback interfaces
have been configured.
hostname C
...
router ospf 600
network 172.16.32.1 0.0.0.0 area 100
network 192.168.2.1 0.0.0.0 area 100
...
What is the default router ID of Router C?
192.168.2.1
4 - What are DRs and BDRs used for when using the OSPF routing protocol?
Reduce routing table updates in a broadcast network.
5 - You have a medium-sized business network with twelve subnets (192.168.1.0/24 through
192.168.12.0/24). You use OSPF for your routing protocol. One Ethernet subnet has five routers,
all in the same OSPF area as shown.
You want to ensure that RouterC becomes the designated router on the subnet. Assuming that no
additional configuration parameters are configured other than what is shown, how could you
accomplish this task?
Change the IP address on the interface connected to the 192.168.12.0/24 subnet to 192.168.12.254.
AND For the interface connected to the 192.168.12.0/24 subnet , set the OSPF priority to 2. AND For the
OSPF process, set the router-id to 200.1.1.1.
6 - You are running OSPF as your routing protocol. One Ethernet subnet has five OSPF routers on the
subnet. A partial configuration for two of the routers is shown. Both routers are connected to the subnet
through the Fa0/1 interface. All interfaces are up.
RouterA will be the DR because of the loopback interface IP address.
7 - Given this configuration, which of the following statements are true for both routers on SubnetA?
RouterA will never become the DR or the BDR AND The router ID for RouterA is 15.1.1.1. AND The router
ID for RouterB is 12.0.0.1.
8 - You have five routers running OSPF on a single subnet. RouterB has been elected as the DR.
You remove RouterB from the network for a hardware upgrade. The next day, you add the router
back onto the network. What will happen when you add RouterB back onto the network?
RouterB will become the DR only if a new election occurs.
9 - Which of the following are true of OSPF configuration to enable two routers to become adjacent?
Hello and dead timer intervals must match on all routers. AND The area assigned to each network must
match.
10 - Which of the following is true regarding OSPF?
Does not have the 16-hop limitation of RIP.
7.2.4
1 - You want two routers to share routing information with each other using the OSPF routing
protocol.
Which of the following must happen for these two routers to become neighbors over their serial
interfaces?
They must be configured with matching areas. AND They must have a shared data link.
2 - An OSPF router named RTR5 has been selected as the designated router (DR).
Which of the following are true for RTR5?
RTR5 has the highest OSPF priority. AND All non-designated routers in the internetwork exchange link-
state data with RTR5, but not with each other.
3 - Match each OSPF communication state on the left with its corresponding attributes on the right. Each
state may be used once, more than once, or not at all.
4 - Which of the following is contained in an OSPF hello packet?
The router's RID AND A list of the router's neighbors
5 - RTR1, RTR2, and RTR3 have been configured to use the OSPF protocol. RTR1 and RTR2
are neighbors; RTR3 and RTR2 are also neighbors.
RTR2 fails to receive a hello packet from RTR3 within the dead interval.
RTR2 declares RTR3 to be down.
6 - When you check the routing table on LondonA, you find that it has not learned about network
172.17.1.16 from LondonB. What is the problem?
The areas defined in the network statements do not match.
7 - Which of the following does OSPF use to create and maintain routing tables?
Route identification AND Neighbor discovery AND Topology exchange
8 - You want to change the amount of time it takes for a hello packet to not be received before a router is
declared offline. Which setting do you need to change?
Dead Interval
9 - During which state in the OSPF communication process are link-state databases exchanged?
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2-way
10 - Which of the following are considered stable neighbor states?
2-way AND Full State
7.3.5
In this lab, your task is to:
Configure the Salta router to share routing information using OSPF with the Jujuy router.
When you are finished, save your changes.
Complete this lab as follows:
1.
Select
Salta
.
2.
Press
Enter
to get started.
3.
At the Salta> prompt, type
enable
and press
Enter
.
4.
At the Salta# prompt, type
config t
and press
Enter
.
5.
At the Salta(config)# prompt, type
router ospf 100
and press
Enter
.
6.
At the Salta(config-router)# prompt, type
network 192.168.1.0 0.0.0.255 area 0
and
press
Enter
.
7.
At the Salta(config-router)# prompt, type
network 192.168.2.0 0.0.0.255 area 0
and
press
Enter
.
8.
At the Salta(config-router)# prompt, type
network 172.17.150.140 0.0.0.3 area 0
and
press
Enter
.
9.
Press
Ctrl
+
Z
.
10. At the Salta# prompt, type
copy run start
and press
Enter
.
11. Press
Enter
to begin building the configuration.
7.3.6
Required Actions & Questions
Run OSPF for area 0 on all RouterA interfaces
Q1Which process ID is used by OSPF on each router?
Your answer:
Correct answer: 100
Q2Which network statements enable OSPF on each interface?
Your answer:
Correct answer: 3
Q3Which area does each network belong to?
Your answer:
Correct answer: Area 0
Q4Why are the networks learned from RouterB not summarized?
Your answer:
Correct answer: OSPF does not perform automatic summarization within the same area.
Q5What effect does the process ID have on OSPF routing?
Your answer:
Correct answer: The process ID number has no effect on OSPF routing in this situation.
Q6Why didn't RouterB learn about the 192.168.1.0/25 network?
Your answer:
Correct answer: The network statement enabling OSPF on that interface was removed.
Q7Which routes did RouterB learn from RouterA?
Your answer:
Correct answer: RouterB learns of all networks connected to RouterA.
Q8How does the network command affect route summarization for the routes reported to
RouterB?
Your answer:
Correct answer: It does not have any effect on summarization.
Q9Why didn't RouterA learn of any routes from RouterB?
Your answer:
Correct answer: The networks are in different areas.
Q10Which routes do you expect to show on RouterB?
Your answer: All Gigabit interfaces connected to RouterA.
Correct answer: All interfaces connected to RouterA.
Explanation
You should have learned the following:
1.
Both routers use process ID 100.
2.
Network statements use wildcard masks that identify the exact subnet assigned to each
interface, each router having three network statements.
3.
All networks are members of area 0.
4.
With OSPF, routes are not summarized. OSPF does not perform automatic summarization
within the same area.
5.
The process ID number has no effect on OSPF routing in this situation. Process IDs used
on each router do not need to match.
6.
RouterB does not learn of the 192.168.1.0/25 network because the
network
statement
enabling OSPF on that interface was removed. RouterA will not share information about
that network with neighbor routers.
7.
RouterB learns of all networks connected to RouterA. The single
network
statement
enables OSPF on all interfaces.
8.
The
network
command only determines which interfaces participate in the OSPF
process; it does not have any effect on summarization.
9.
RouterA does not learn of any routes from RouterB because the networks are in different
areas.
10. This network statement enables OSPF on all interfaces; therefore, RouterB learns of all
networks connected to RouterA. The address of 0.0.0.0 with wildcard mask of
255.255.255.255 matches all subnets configured on the router. This statement is more
general than the previous statements.
Complete this lab as follows:
1.
Select
RouterA
.
2.
Press
Enter
to get started.
3.
At the RouterA> prompt, type
enable
and press
Enter
.
4.
At the RouterA# prompt, type
show ip protocols
and press
Enter
.
5.
Select
RouterB
.
6.
Press
Enter
to get started.
7.
At the RouterB> prompt, type
enable
and press
Enter
.
8.
At the RouterB# prompt, type
show ip protocols
and press
Enter
.
9.
Answer Questions 1-3.
10. At the RouterA# prompt, type
show ip route
and press
Enter
.
11. Answer Question 4.
12. At the RouterA# prompt, type
conf t
and press
Enter
.
13. At the RouterA(config)# prompt, type
no router ospf 100
and press
Enter
to disable
OSPF for all interfaces.
14. Press
Ctrl
+
Z
.
15. At the RouterA# prompt, type
show ip route
and press
Enter
to verify that OSPF has
been disabled.
16. On RouterA, reconfigure OSPF.
a.
At the RouterA# prompt, type
conf t
and press
Enter
.
b.
At the RouterA(config)# prompt, type
router ospf 200
and press
Enter
to disable
OSPF for all interfaces.
c.
At the RouterA(config-router)# prompt, type
network 192.168.1.0 0.0.0.127 area
0
and press
Enter
.
d.
At the RouterA(config-router)# prompt, type
network 192.168.1.128 0.0.0.127
area 0
and press
Enter
.
e.
At the RouterA(config-router)# prompt, type
network 192.168.10.0 0.0.0.255
area 0
and press
Enter
.
f.
Press
Ctrl
+
Z
.
17. At the RouterA# prompt, type
show ip route
and press
Enter
to view the routing table.
18. Answer Question 5.
19. On RouterA, modify the OSPF configuration.
a.
At the RouterA# prompt, type
conf t
and press
Enter
.
b.
At the RouterA(config)# prompt, type
router ospf 200
and press
Enter
.
c.
At the RouterA(config-router)# prompt, type
no network 192.168.1.0 0.0.0.127
area 0
and press
Enter
.
20. On RouterB at the RouterB# prompt, type
show ip route
and press
Enter
to view the
routing table.
21. Answer Question 6.
22. On RouterA, reconfigure OSPF.
a.
At the RouterA(config)# prompt, type
no router ospf 200
and press
Enter
.
b.
At the RouterA(config)# prompt, type
router ospf 200
and press
Enter
.
c.
At the RouterA(config-router)# prompt, type
network 192.168.0.0 0.0.255.255
area 0
and press
Enter
.
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Notice that the subnet address and wildcard mask include all networks configured
on RouterA.
23. On RouterB at the RouterB# prompt, type
show ip route
and press
Enter
to view the
routing table.
24. Answer Questions 7-8.
25. On RouterA, reconfigure OSPF.
a.
At the RouterA(config-router)# prompt, type
no router ospf 200
and press
Enter
.
b.
At the RouterA(config)# prompt, type
router ospf 200
and press
Enter
.
c.
At the RouterA(config-router)# prompt, type
network 192.168.0.0 0.0.255.255
area 1
and press
Enter
.
Notice that the
network
command configures OSPF for a different area.
d.
Press
Ctrl
+
Z
.
26. At the RouterA# prompt, type
show ip route
and press
Enter
to view the routing table.
27. Answer Question 9.
28. On RouterA, reconfigure OSPF.
a.
At the RouterA# prompt, type
conf t
and press
Enter
.
b.
At the RouterA(config)# prompt, type
router ospf 200
and press
Enter
.
c.
At the RouterA(config-router)# prompt, type
network 0.0.0.0 255.255.255.255
area 0
and press
Enter
.
29. Answer Question 10.
30. At the RouterB# prompt, type
show ip route
and press
Enter
to test your answer.
7.3.7
In this lab, your task is to:
Use the
show ip interface
command to identify the IP address and mask for each
interface before configuring OSPF.
Determine the wildcard mask to be used in the
network
statements to enable OSPF.
Configure RouterA to share information about the networks connected to the Fa0/1 and
Fa0/1/0 interfaces using OSPF area 0.
Configure RouterB to share information about the networks connected to the Fa0/1 and
Fa0/1/0 interfaces using OSPF area 0.
Neither router should share information about the network connected to its Fa0/0
interface.
Complete this lab as follows:
1.
Configure RouterA.
a.
Select
RouterA
.
b.
Press
Enter
to get started.
c.
At the RouterA> prompt, type
enable
and press
Enter
.
d.
At the RouterA# prompt, type
config t
and press
Enter
.
e.
At the RouterA(config)# prompt, type
router ospf 100
and press
Enter
.
f.
At the RouterA(config-router)# prompt, type
network 172.19.0.208 0.0.0.15 area
0
and press
Enter
.
g.
At the RouterA(config-router)# prompt, type
network 172.19.0.0 0.0.0.127 area
0
and press
Enter
.
h.
Press
Ctrl
+
Z
.
i.
At the RouterA# prompt, type
copy run start
and press
Enter
.
j.
Press
Enter
to begin building the configuration.
2.
Configure RouterB.
a.
Select
RouterB
.
b.
Press
Enter
to get started.
c.
At the RouterB> prompt, type
enable
and press
Enter
.
d.
At the RouterB# prompt, type
config t
and press
Enter
.
e.
At the RouterB(config)# prompt, type
router ospf 100
and press
Enter
.
f.
At the RouterB(config-router)# prompt, type
network 172.19.0.160 0.0.0.31 area
0
and press
Enter
.
g.
At the RouterB(config-router)# prompt, type
network 172.19.0.0 0.0.0.127 area
0
and press
Enter
.
h.
Press
Ctrl
+
Z
.
i.
At the RouterB# prompt, type
copy run start
and press
Enter
.
j.
Press
Enter
to begin building the configuration.
7.3.8
1 - You want to configure a single area OSPF network for area 0. What are the minimum commands you
must use?
router ospf 12
network 1.1.1.0 0.0.0.255 area 0
2 -
You want to configure Router B to run OSPF with a local process ID of 100. Both interfaces S0 and S1
on Router B belong to area 300. Which set of commands should you enter?
router ospf 100
network 172.16.16.1 0.0.0.0 area 300
network 172.16.32.2 0.0.0.0 area 300
3 - When you check the routing table on LondonA, you find that it has not learned about network
172.17.1.16 from LondonB. What is the problem?
The IP address assigned to Serial0/0 on LondonA is not on the same subnet as the IP address
assigned to Serial0/1 on LondonB.
4 - You want to prevent all interfaces on a router from sending or responding to OSPF Hello
messages.
Which command should you use?
passive-interface default
5 -
You are configuring OSPF for Area 0. SubnetA uses an address of 172.16.20.48/28. Which wildcard
mask value would you use for the network statement?
0.0.0.15
6 - You are configuring OSPF for a single router with two interfaces, as shown in the image.
Which
network
statement(s) would you use to configure both interfaces for OSPF for area 0?
network 192.168.1.64 0.0.0.31 area 0
network 192.168.1.128 0.0.0.15 area 0
7 - You want to configure OSPF to run only on the interface with an IP address of 10.1.1.112/26, and you
want to associate the interface with Area 3. Which of the following commands will accomplish your
goal?
network 10.1.1.64 0.0.0.63 area 3
8 -
When you check the routing table on LondonA, you find that it has not learned about network
172.17.1.16 from LondonB. What is the problem?
Wildcard mask values for the
network
statements are incorrect.
9 - RouterA is connected to RouterB through the serial link. What routes will RouterB have in its routing
table that it has learned from RouterA?
172.16.1.64/27 and 172.16.1.96/28
10 - One of the interfaces in a router with OSPF enabled is connected to a network link where no
other routers reside.
You want to prevent this interface from sending OSPF Hello messages, as there are no other
routers on that network to respond.
Which command should you use?
passive-interface <type> <number>
7.4.5
1 - Match each OSPF component on the left with its corresponding description on the right. Each
component may be used once, more than once, or not at all.
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2 - Match each LSA type on the left with the appropriate description on the right.
3 - Match each OSPF database on the left with the corresponding description on the right. Each database
may be used once, more than once, or not at all.
4 –
5 - A set of routers and links that share the same link-state database information is known as what?
Area
6 - Which of the following connects two areas?
Area border router
7 - Which of the following describes a Type 2 LSA?
Describes a network that has a DR and BDR.
8 - Which database lists the best possible route calculated from the SPF?
Routing table
9 - Which algorithm does a router use to calculate all routes for a subnet?
SPF
10 - Which process do routers use to select the best path when multiple route possibilities are available?
Administrative Distance
7.5.4
In this lab, your task is to:
Troubleshoot and correct the problem.
Take only the necessary actions to correct the problem you find.
Use the information above to identify misconfigurations and to correct problems.
Complete this lab as follows:
1.
Select
R1
.
2.
Press
Enter
to get started.
3.
At the R1> prompt, type
enable
and press
Enter
.
4.
At the R1# prompt, type
ping 192.168.3.30
or
ping 192.168.3.158
and press
Enter
on
the R3 router to verify the problem.
5.
At the R1# prompt, type
show ip route
and press
Enter
.
Notice that R1 knows about all networks connected to R2, but has not learned about any
networks connected to R3. This means that the problem is likely with the R3 router.
6.
Select
R3
.
7.
Press
Enter
to get started.
8.
At the R3> prompt, type
enable
and press
Enter
.
9.
At the R3# prompt, type
show ip route
and press
Enter
.
R3 has not learned about any routes through OSPF.
10. At the R3# prompt, type
show ip protocols
and press
Enter
.
11. Verify the following values of the OSPF configuration:
o
OSPF is running.
o
Network statements include all connected networks.
o
Network statements use the correct area number.
You should notice that the area number is using 1, not 0. With OSPF, all routers
must be using the same area number.
o
A network statement is not included for Fa0/1.
12. On R3, modify the network statements to use area 0 so that OSPF runs on all directly
connected networks.
o
At the R3# prompt, type
conf t
and press
Enter
.
o
At the R2(config)# prompt, type
router ospf 300
and press
Enter
.
o
At the R3(config-router)# prompt, type
no network 172.18.0.64 0.0.0.3 area 1
and press
Enter
.
o
At the R3(config-router)# prompt, type
no network 192.168.3.0 0.0.0.255 area 1
and press
Enter
.
o
At the R3(config-router)# prompt, type
network 172.18.0.64 0.0.0.3 area 0
and
press
Enter
.
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o
At the R3(config-router)# prompt, type
network 192.168.3.0 0.0.0.255 area 0
and press
Enter
.
o
Press
Ctrl
+
Z
.
You could also use network statements for 192.168.3.0 0.0.0.31 and
192.168.3.128 0.0.0.31 to add each user network segment individually. However,
adding a single network statement for the entire 192.168.3.0 network using
0.0.0.255 covers both of the user networks attached with a single statement.
13. At the R1# prompt, type
show ip route
and press
Enter
to verify the fix.
14. At the R2# prompt, type
show ip route
and press
Enter
to verify the fix.
15. At the R3# prompt, typpe
show ip route
and press
Enter
to verify the fix.
16. At the R1# prompt, type
ping 192.168.3.30
or
ping 192.168.3.158
and press
Enter
to
verify connectivity.
7.5.5
In this lab, your task is to:
Troubleshoot and correct the problem.
Take only the necessary actions to correct the problem you find.
Identify misconfigurations and correct problems.
Complete this lab as follows:
1.
Select
R1
.
2.
Press
Enter
to get started.
3.
At the R1> prompt, type
enable
and press
Enter
.
4.
At the R1# prompt, type
ping 192.168.3.30
or
ping 192.168.3.158
and press
Enter
.
5.
At the R1# prompt, type
show ip route
and press
Enter
.
Notice that R1 knows about some of the networks connected to R2, but it does not know
about network 172.18.0.64/30, nor has it learned any routes from R3. This means the
problem is on either R2 or R3, possibly on the serial link between the two routers.
6.
Select
R2
.
7.
Press
Enter
to get started.
8.
At the R2> prompt, type
enable
and press
Enter
.
9.
At the R2# prompt, type
show ip route
and press
Enter
.
Because network 172.18.0.64/30 shows as a directly connected route in the routing table,
you know that the interface is up and has been configured with a correct IP address.
10. At the R2# prompt, type
show ip protocols
and press
Enter
.
11. Verify the following values of the OSPF configuration:
o
OSPF is running.
o
Network statements include the 172.18.0.64/30
o
Network statements use the correct area number.
Notice that there is a network statement for network 172.18.0.0/30. However, this
statement will not enable OSPF on the 172.18.0.64/30 network.
12. On R2, modify the network statement to use the correct IP address and wildcard mask so
that OSPF is enabled on the Serial0/1/1 interface.
o
At the R2# prompt, type
conf t
and press
Enter
.
o
At the R2(config)# prompt, type
router ospf 200
and press
Enter
.
o
At the R2(config-router)# prompt, type
no network 172.18.0.0 0.0.0.3 area 0
and
press
Enter
.
o
At the R2(config-router)# prompt, type
network 172.18.0.64 0.0.0.3 area 0
and
press
Enter
.
o
Press
Ctrl
+
Z
.
13. At the R1# prompt, type
show ip route
and press
Enter
to verify the fix.
14. At the R2# prompt, type
show ip route
and press
Enter
to verify the fix.
15. At the R3# prompt, typpe
show ip route
and press
Enter
to verify the fix.
16. At the R1# prompt, type
ping 192.168.3.30
or
ping 192.168.3.158
and press
Enter
to
verify connectivity.
7.5.6
1 - On an OSPF network what are the default Intervals for the Hello, Dead, Wait, and Retransmit timers?
Hello 10, Dead 40, Wait 40, Retransmit 5
2 - You need to view the configuration settings of an interface on your router to see if it can send
or respond to OSPF Hello messages.
Which command should you use?
show ip ospf interface <interface>
3 -
You are reviewing the configuration of a router that uses EIGRP for its routing protocol. The
output from the
show ip protocols
command is as follows:
Routing Protocol is "eigrp 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 2
Redistributing: eigrp 1
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is in effect
Maximum path: 5
Routing for Networks:
192.168.1.0
192.168.2.0
192.168.3.0
Routing Information Sources:
Gateway Distance Last Update
192.168.1.12 90 00:55:50
192.168.2.15 90 00:55:50
Distance: internal 90 external 170
Based on the output, what is true of this configuration?
EIGRP is sharing information about three networks. AND The routing process has two neighbors.
4 - You have an ospf network, the dead interval has been set to 30. Which of the following commands
would you use to change the dead interval on an interface back to the default?
(config-if)#ip ospf dead-interval 40
5 -
The Houston router is connected to the Dallas router with a serial link. You have configured
both routers with OSPF. You use the
debug ip ospf events
command and see the following
output:
*Feb 8 14:13:45.299: OSPF: Send hello to 224.0.0.5 area 0 on
Serial0/1/0 from 10.0.0.1
*Feb 8 14:13:47.655: OSPF: Rcv hello from 192.168.1.83 area 0
from Serial0/1/0 10.0.0.2
*Feb 8 14:13:47.655: OSPF: Mismatched hello parameters from
10.0.0.2
*Feb 8 14:13:47.655: OSPF: Dead R 40 C 40, Hello R 10 C 20
*Feb 8 14:14:07.655: OSPF: 192.168.1.83 address 10.0.0.2 on
Serial0/1/0 is dead
*Feb 8 14:14:07.655: %OSPF-5-ADJCHG: Process 100, Nbr
192.168.1.83 on Serial0/1/0 from FULL to DOWN, Neighbor Down:
Dead timer expired
What is the problem?
The hello timer configured on the Dallas router is incorrect.
6 - You have configured OSPF routing on RouterA. A partial configuration is shown below:
hostname RouterA
!
interface FastEthernet 0/0
ip address 172.16.1.1 255.255.255.224
duplex auto
speed auto
!
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interface FastEthernet 0/1
ip address 172.16.1.33 255.255.255.240
duplex auto
speed auto
!
interface Serial 0/1/0
ip address 172.16.1.62 255.255.255.252
encapsulation ppp
!
router ospf 100
network 172.16.1.0 0.0.0.31 area 0
!
RouterA is connected to RouterB through the serial link. When you check RouterA, it has not
learned of any routes connected to RouterB.
What should you do to correct the problem?
Add a
network
statement that uses a network of 172.16.1.32 and a wildcard mask of 0.0.0.31.
7 - You have configured Router A, Router B, and Router C as shown. Users in network 10.0.0.0
report that they have no trouble accessing resources within their own network, but claim they
cannot access a database located on subnet 192.168.0.0. Users all the other networks claim they
are having no problems accessing the database.
What is the problem?
Router A has been configured with an incorrect network address.
8 - You have configured Router A, Router B, and Router C as shown. Users in network 10.1.1.0 claim they
cannot access resources in network 192.168.2.0. What is the problem?
Router C is configured with the incorrect area number.
9 - You've just configured Router_London as shown. The router is part of EIGRP autonomous
system 200. Both directly connected networks 172.17.0.0 and 172.18.0.0 are to be advertised to
neighbor routers within Area 200.
When testing your router, you discover the neighboring routers have no entries in their routing
table for your subnets. What is the problem?
The area is incorrectly configured.
10 - You are reviewing the configuration of a router that uses EIGRP for its routing protocol. The
output from the
show ip eigrp topology all-links
command is as follows:
Router# show ip eigrp topology all-links
IP-EIGRP Topology Table for process 77
Codes: P - Passive, A - Active, U - Update, Q - Query, R -
Reply,
r - Reply status
P 172.16.90.0 255.255.255.0, 2 successors, FD is 46251776
via 172.16.80.28 (46251776/46226176), Ethernet0
via 172.16.81.28 (46251776/46226176), Ethernet1
via 172.16.80.31 (46277376/46251000), Serial0
via 172.16.81.31 (46277400/46251800), Serial1
Based on the output, which of the following are true?
Serial0 is a feasible successor route. AND Ethernet0 and Ethernet1 are successor routes.
7.6.6
1 - Which of the following are benefits of EIGRP?
Supports multiple protocols. AND Low use of network resources.
2 - You are currently using OSPF on your network. Which of the following would you gain by
switching to EIGRP?
Auto-summarization AND Multiprotocol support AND Faster recovery from primary link failure
3 - Which of the following are true of EIGRP configuration to enable two routers to become
adjacent?
Authentication parameters must match. AND The area number used to configure EIGRP must
match.
4 –
5 - EIGRP uses a neighbor's table to keep track of neighbor routers. Which of the following helps
the router identify cost values to reach each neighbor in the routing table?
Round-trip timers
6 - What is the total distance to a destination through a specific neighbor router is known as?
Computed distance
7 - What does EIGRP use to send partial routing updates?
RTP
8 - Which IP address does EIGRP send routing updates to?
224.0.010
9 - Which algorithm does EIGRP use to choose an alternate route when a route fails and there is
no feasible successor?
DUAL
10 - Where are all known routes to a destination kept?
Topology table
7.7.4
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In this lab, your task is to configure the Salta router to share routing information using EIGRP
with the Jujuy router:
Use the
router eigrp 100
command to configure the Salta router.
Add
network
statements to identify networks on which to run EIGRP.
When you are finished, save your changes.
Complete this lab as follows:
1.
Select
Salta
.
2.
Press
Enter
to get started.
3.
At the Salta> prompt, type
enable
and press
Enter
.
4.
At the Salta# prompt, type
config t
and press
Enter
.
5.
At the Salta(config)# prompt, type
router eigrp 100
and press
Enter
.
6.
At the Salta(config-router)# prompt, type
network 192.168.1.0
and press
Enter
.
7.
At the Salta(config-router)# prompt, type
network 192.168.2.0
and press
Enter
.
8.
At the Salta(config-router)# prompt, type
network 172.17.150.140 0.0.0.3
and press
Enter
.
9.
Press
Ctrl
+
Z
.
10. At the Salta# prompt, type
copy run start
and press
Enter
.
11. Press
Enter
to begin building the configuration.
7.7.8
1 - RouterA is connected to RouterB through the serial link. Which route or routes will
RouterB learn from RouterA and contain in its routing table?
172.16.1.64/27 and 172.16.1.96/28
2 - What are the minimum commands you must use to configure EIGRP on a router,?
router eigrp 12 AND network 1.0.0.0
3 -
You want to configure RouterB to run EIGRP. The networks attached to both interfaces S0
and S1 on RouterB are to be advertised within Autonomous System 100.
Which set of commands should you enter?
router eigrp 100
network 172.16.0.0
network 172.17.0.0
4 - You are reviewing the configuration of a router that uses EIGRP for its routing protocol.
Shown below is the output from the
show ip protocols
command:
Routing Protocol is "eigrp 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 2
Redistributing: eigrp 1
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is in effect
Maximum path: 5
Routing for Networks:
192.168.1.0
192.168.2.0
192.168.3.0
Routing Information Sources:
Gateway Distance Last Update
192.168.1.12 90 00:55:50
192.168.2.15 90 00:55:50
Distance: internal 90 external 170
Based on the output, what is true of this configuration?
EIGRP will load balance on up to five unequal-cost routes.
5 - You have configured EIGRP routing on RouterA. A partial configuration is shown below:
hostname RouterA
!
interface FastEthernet 0/0
ip address 172.16.1.65 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet 0/1
ip address 172.16.1.97 255.255.255.240
duplex auto
speed auto
!
interface Serial 0/1/0
ip address 10.21.177.85 255.255.255.252
encapsulation ppp
!
router eigrp 100
network 172.16.0.0
network 10.0.0.0
auto-summary
!
RouterA is connected to RouterB through the serial link. Which route or routes will RouterB
have learned from RouterA and contain in its routing table?
172.16.0.0/16
6 - You have configured EIGRP routing on RouterA. A partial configuration is shown below:
hostname RouterA
!
interface FastEthernet 0/0
ip address 192.168.1.65 255.255.255.224
duplex auto
speed auto
!
interface FastEthernet 0/1
ip address 192.168.1.97 255.255.255.240
duplex auto
speed auto
!
interface Serial 0/1/0
ip address 10.21.177.85 255.255.255.252
encapsulation ppp
!
router eigrp 100
network 192.168.1.0
network 10.0.0.0
auto-summary
!
RouterA is connected to RouterB through the serial link.
When you check the routing table on RouterA, you see a single route reported learned though
EIGRP to network 192.168.1.0/24. You want RouterA to have routes to the individual networks
connected to RouterA.
How should you modify the configuration of RouterA?
Use the
no auto-summary
command.
7 - You are reviewing the configuration of a router that uses EIGRP for its routing protocol.
Shown below is the output from the
show ip eigrp topology all-links
command:
Router# show ip eigrp topology all-links
IP-EIGRP Topology Table for process 77
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Codes: P - Passive, A - Active, U - Update, Q - Query, R -
Reply,
r - Reply status
P 172.16.90.0 255.255.255.0, 2 successors, FD is 46251776
via 172.16.80.28 (46251776/46226176), Ethernet0
via 172.16.81.28 (46251776/46226176), Ethernet1
via 172.16.80.31 (46277376/46251889), Serial0
P 172.16.81.0 255.255.255.0, 1 successors, FD is 307200
via 172.16.82.28 (307200/281600), Ethernet1
via 172.16.80.28 (308500/281600), Ethernet0
via 172.16.80.31 (332800/307900), Serial0
Based on the output, which of the following is true for the route to network 172.16.81.0/24?
The route through Ethernet1 is the successor route.
8 - In which type of network must packets being sent between subnets pass through one or more
subnets of a different network?
Discontiguous
9 - What is the maximum number of paths equal load balancing can support?
16
10 - Which subcommand can be used to add more routes to the table for additional balancing?
Maximum-paths
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