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Exam Answers v3.x and v4.0
V3.x
Options with "*" are correct answer
1 Assuming the ACL in the graphic is correctly applied to an interface, what effect will the ACL have on network traffic?
All traffic to network 172.16.0.0 will be denied.
All TCP traffic will be permitted to and from network 172.16.0.0.
* All telnet traffic from the 172.16.0.0 network to any destination will be denied.
All port 23 traffic to the 172.16.0.0 network will be denied.
All traffic from the 172.16.0.0 network will be denied to any other network.
2 Create a standard ACL that will deny traffic from 192.5.5.25 to the 210.93.105.0 network but will allow traffic from all other hosts. (Choose two.)
Router(config)# access-list 22 deny 192.5.5.25 0.0.0.0
Router(config)# access-list 22 deny host 192.5.5.25 0.0.0.0
Router(config)# access-list 22 permit any any
* Router(config)# access-list 22 deny 192.5.5.25 0.0.0.0
Router(config)# access-list 22 permit any
* Router(config)# access-list 22 deny host 192.5.5.25
Router(config)# access-list 22 permit any
Router(config)# access-list 22 deny 192.5.5.0 0.0.0.255
Router(config)# access-list 22 permit any
3 The following commands were entered on a router:
Router(config)# access-list 2 deny 172.16.5.24
Router(config)# access-list 2 permit any
What can be concluded about this set of commands?
The access list statements are misconfigured.
All nodes on 172.16.0.0 will be denied access when these statements are applied.
* The default wildcard mask, 0.0.0.0 is assumed.
The default wildcard mask 255.255.255.255 is assumed.
4 ACL statements operate in sequential, logical order. If a condition match is true, the rest of the ACL statements are not checked. If all of the ACL statements are unmatched, what happens to the packet?
The packets will be placed in a buffer and forwarded when the ACL is removed.
The packets will be sent to the source with an error notification message.
The implicit permit any statement placed at the end of the list will allow the packets to flow through uninhibited.
* The implicit deny any statement placed at the end of the list will cause the packets to be dropped.
5 Choose the command that will correctly configure a standard ACL. Router# access-list 10 permit any Router# access-list 101 permit any
* Router(config)# access-list 10 permit any
Router(config)# access-list 101 permit any
Router(config)# access-list 10 permit any any
6 Select the commands that will apply the ACL in the diagram to filter traffic going to the 192.168.2.0 network.
Router1# configure terminal
Router1(config)# access-list 10 in E0
Router1(config)# interface ethernet 0
Router1(config-if)# access-list 10 in
Router2(config)# interface s1
Router2(config-if)# ip access-group 10 out
* Router2(config)# interface ethernet 0
Router2(config-if)# ip access-group 10 out
Router1(config)# interface ethernet 0
Router1(config-if)# ip access-group 10 out
Router2# configure terminal
Router2(config)# access-group 10 out
7 Which statements are true regarding the meaning of the access control list wildcard mask 0.0.0.7? (Choose two.)
The first 29 bits of a supplied IP address will be ignored.
* The last three bits of a supplied IP address will be ignored.
The first 32 bits of a supplied IP address will be matched.
* The first 29 bits of a supplied IP address will be matched.
The last four bits of a supplied IP address will be matched.
8 The router IOS tests each condition statement in an ACL in sequence. Once a match is made, which of the following occurs? (Choose two.)
The entire ACL must be deleted and recreated.
* The accept or reject action is performed.
The packet is forwarded to the next hop.
* The remaining ACL statements are not checked.
The router goes through the list again to verify that a match has been made.
9 Select the correct statements about extended ACLs. (Choose two)
Extended ACLs use a number range from 1-99.
Extended ACLs end with an implicit permit statement.
* Extended ACLs evaluate the source and destination addresses.
* Port numbers can be used to add greater definition to an ACL.
Multiple ACLs can be placed on the same interface as long as they are in the same direction.
10 Which of the following are reasons to use ACLs? (Choose three.)
* to provide a basic level of security for network access
to speed up network performance by filtering priority packets
* to preserve bandwidth by providing a mechanism for traffic flow control
to decide which packets are forwarded or blocked at the router console port
* to screen certain hosts to either allow or deny access to part of a network
to allow all packets passing through the router access to all parts of the network
11 Which of the following parameters can ACLs use to filter traffic? (Choose three.)
packet size
* protocol suite
* source address
* destination address
source router interface
destination router interface
12 Which statement is true regarding wildcard masks?
The wildcard mask and subnet mask perform the same function.
The wildcard mask is always the inverse of the subnet mask.
* A "0" in the wildcard mask identifies IP address bits that must be checked.
A "1" in the wildcard mask identifies a network or subnet bit.
13 Select the statements that describe ACL processing of packets. (Choose three.)
* An implicit deny any rejects any packet that does not match any ACL statement.
* A packet can either be rejected or forwarded as directed by the statement that is matched.
A packet that has been denied by one statement can be permitted by a subsequent statement.
A packet that does not match the conditions of any ACL statements will be forwarded by default.
* Each statement is checked only until a match is detected or until the end of the ACL statement list.
Each packet is compared to the conditions of every statement in the ACL before a forwarding decision is made.
14 An access list has been created that will deny the host 204.204.7.89 access to an ftp server located at 196.6.13.254. access-list 111 deny tcp 204.204.7.89 0.0.0.0 196.6.13.254 0.0.0.0 eq 21 access-list 111 permit tcp any any Which of the following groups of commands will place this ACL in the proper location?
Router2(config)# interface s0/0
Router2(config-if)# ip access-group 111 in
Router2(config)# interface fa0/0
Router2(config-if)# ip access-group 111 out
* Router2(config)# interface fa0/0
Router2(config-if)# ip access-group 111 in
Router3(config)# interface fa0/0
Router3(config-if)# ip access-group 111 in
Router3(config)# interface s0/1
Router3(config-if)# ip access-group 111 out
Router3(config)# interface fa0/0
Router3(config-if)# ip access-group 111 out
15 Choose the commands that will correctly configure a standard ACL. (Choose two.)
* Router(config)# access-list 97 permit host 192.5.5.1
* Router(config)# access-list 32 permit 210.93.105.3 0.0.0.0
Router(config)# access-list 148 permit 201.100.11.2 0.0.0.0
Router(config)# access-list 107 permit host 192.5.5.1 213.45.27.0 0.0.0.255 eq 23
Router(config)# access-list 10 permit tcp 192.5.5.1 0.0.0.255 201.100.11.0 0.0.0.255 eq 80
16 Assuming the ACL in the graphic is correctly applied to an interface, what effect will this ACL have on network traffic?
* Host 192.168.15.4 will be denied ftp access to any destination, but will be permitted all other access.
All ftp traffic to host 192.168.15.4 will be denied.
All traffic from that interface will be denied.
No traffic will be denied because a "permit" statement does not exist in this ACL.
17 Create an access list that will prevent only the host 192.5.5.148 from accessing a web site located at 210.93.105.50.
access-list 10 deny tcp host 192.5.5.148 host 210.93.105.50 eq 80
access-list 10 permit tcp any any
access-list 10 deny tcp 192.5.5.148 0.0.0.0 210.93.105.50 0.0.0.0 eq 23
access-list 10 permit tcp any any
* access-list 100 deny tcp 192.5.5.148 0.0.0.0 210.93.105.50 0.0.0.0 eq 80
access-list 100 permit tcp any any
access-list 100 deny tcp 192.5.5.148 0.0.0.255 210.93.105.50 0.0.0.255 eq 80
access-list 100 permit tcp any any
access-list 100 deny tcp host 192.5.5.148 255.255.255.255 210.93.105.50 255.255.255.255 eq 80
access-list 100 permit tcp any any
18 A router that has two Ethernet interfaces and one serial interface is configured to route both IP and IPX. What is the maximum number of IP ACLs that can be configured to filter packets on this router?
1
2
3
6
* 12
19 Which of the following matches an ACL identification number with the correct protocol?(Choose three.)
0 - standard IP
* 99 - standard IP
* 100 - extended IP
210 - extended IP
678 - extended IPX
* 888 - standard IPX
Options with highlight colours are correct answer
All traffic to network 172.16.0.0 will be denied.
All TCP traffic will be permitted to and from network 172.16.0.0.
* All telnet traffic from the 172.16.0.0 network to any destination will be denied.
All port 23 traffic to the 172.16.0.0 network will be denied.
All traffic from the 172.16.0.0 network will be denied to any other network.
2 Create a standard ACL that will deny traffic from 192.5.5.25 to the 210.93.105.0 network but will allow traffic from all other hosts. (Choose two.)
Router(config)# access-list 22 deny 192.5.5.25 0.0.0.0
Router(config)# access-list 22 deny host 192.5.5.25 0.0.0.0
Router(config)# access-list 22 permit any any
* Router(config)# access-list 22 deny 192.5.5.25 0.0.0.0
Router(config)# access-list 22 permit any
* Router(config)# access-list 22 deny host 192.5.5.25
Router(config)# access-list 22 permit any
Router(config)# access-list 22 deny 192.5.5.0 0.0.0.255
Router(config)# access-list 22 permit any
3 The following commands were entered on a router:
Router(config)# access-list 2 deny 172.16.5.24
Router(config)# access-list 2 permit any
What can be concluded about this set of commands?
The access list statements are misconfigured.
All nodes on 172.16.0.0 will be denied access when these statements are applied.
* The default wildcard mask, 0.0.0.0 is assumed.
The default wildcard mask 255.255.255.255 is assumed.
4 ACL statements operate in sequential, logical order. If a condition match is true, the rest of the ACL statements are not checked. If all of the ACL statements are unmatched, what happens to the packet?
The packets will be placed in a buffer and forwarded when the ACL is removed.
The packets will be sent to the source with an error notification message.
The implicit permit any statement placed at the end of the list will allow the packets to flow through uninhibited.
* The implicit deny any statement placed at the end of the list will cause the packets to be dropped.
5 Choose the command that will correctly configure a standard ACL. Router# access-list 10 permit any Router# access-list 101 permit any
* Router(config)# access-list 10 permit any
Router(config)# access-list 101 permit any
Router(config)# access-list 10 permit any any
6 Select the commands that will apply the ACL in the diagram to filter traffic going to the 192.168.2.0 network.
Router1# configure terminal
Router1(config)# access-list 10 in E0
Router1(config)# interface ethernet 0
Router1(config-if)# access-list 10 in
Router2(config)# interface s1
Router2(config-if)# ip access-group 10 out
* Router2(config)# interface ethernet 0
Router2(config-if)# ip access-group 10 out
Router1(config)# interface ethernet 0
Router1(config-if)# ip access-group 10 out
Router2# configure terminal
Router2(config)# access-group 10 out
7 Which statements are true regarding the meaning of the access control list wildcard mask 0.0.0.7? (Choose two.)
The first 29 bits of a supplied IP address will be ignored.
* The last three bits of a supplied IP address will be ignored.
The first 32 bits of a supplied IP address will be matched.
* The first 29 bits of a supplied IP address will be matched.
The last four bits of a supplied IP address will be matched.
8 The router IOS tests each condition statement in an ACL in sequence. Once a match is made, which of the following occurs? (Choose two.)
The entire ACL must be deleted and recreated.
* The accept or reject action is performed.
The packet is forwarded to the next hop.
* The remaining ACL statements are not checked.
The router goes through the list again to verify that a match has been made.
9 Select the correct statements about extended ACLs. (Choose two)
Extended ACLs use a number range from 1-99.
Extended ACLs end with an implicit permit statement.
* Extended ACLs evaluate the source and destination addresses.
* Port numbers can be used to add greater definition to an ACL.
Multiple ACLs can be placed on the same interface as long as they are in the same direction.
10 Which of the following are reasons to use ACLs? (Choose three.)
* to provide a basic level of security for network access
to speed up network performance by filtering priority packets
* to preserve bandwidth by providing a mechanism for traffic flow control
to decide which packets are forwarded or blocked at the router console port
* to screen certain hosts to either allow or deny access to part of a network
to allow all packets passing through the router access to all parts of the network
11 Which of the following parameters can ACLs use to filter traffic? (Choose three.)
packet size
* protocol suite
* source address
* destination address
source router interface
destination router interface
12 Which statement is true regarding wildcard masks?
The wildcard mask and subnet mask perform the same function.
The wildcard mask is always the inverse of the subnet mask.
* A "0" in the wildcard mask identifies IP address bits that must be checked.
A "1" in the wildcard mask identifies a network or subnet bit.
13 Select the statements that describe ACL processing of packets. (Choose three.)
* An implicit deny any rejects any packet that does not match any ACL statement.
* A packet can either be rejected or forwarded as directed by the statement that is matched.
A packet that has been denied by one statement can be permitted by a subsequent statement.
A packet that does not match the conditions of any ACL statements will be forwarded by default.
* Each statement is checked only until a match is detected or until the end of the ACL statement list.
Each packet is compared to the conditions of every statement in the ACL before a forwarding decision is made.
14 An access list has been created that will deny the host 204.204.7.89 access to an ftp server located at 196.6.13.254. access-list 111 deny tcp 204.204.7.89 0.0.0.0 196.6.13.254 0.0.0.0 eq 21 access-list 111 permit tcp any any Which of the following groups of commands will place this ACL in the proper location?
Router2(config)# interface s0/0
Router2(config-if)# ip access-group 111 in
Router2(config)# interface fa0/0
Router2(config-if)# ip access-group 111 out
* Router2(config)# interface fa0/0
Router2(config-if)# ip access-group 111 in
Router3(config)# interface fa0/0
Router3(config-if)# ip access-group 111 in
Router3(config)# interface s0/1
Router3(config-if)# ip access-group 111 out
Router3(config)# interface fa0/0
Router3(config-if)# ip access-group 111 out
15 Choose the commands that will correctly configure a standard ACL. (Choose two.)
* Router(config)# access-list 97 permit host 192.5.5.1
* Router(config)# access-list 32 permit 210.93.105.3 0.0.0.0
Router(config)# access-list 148 permit 201.100.11.2 0.0.0.0
Router(config)# access-list 107 permit host 192.5.5.1 213.45.27.0 0.0.0.255 eq 23
Router(config)# access-list 10 permit tcp 192.5.5.1 0.0.0.255 201.100.11.0 0.0.0.255 eq 80
16 Assuming the ACL in the graphic is correctly applied to an interface, what effect will this ACL have on network traffic?
* Host 192.168.15.4 will be denied ftp access to any destination, but will be permitted all other access.
All ftp traffic to host 192.168.15.4 will be denied.
All traffic from that interface will be denied.
No traffic will be denied because a "permit" statement does not exist in this ACL.
17 Create an access list that will prevent only the host 192.5.5.148 from accessing a web site located at 210.93.105.50.
access-list 10 deny tcp host 192.5.5.148 host 210.93.105.50 eq 80
access-list 10 permit tcp any any
access-list 10 deny tcp 192.5.5.148 0.0.0.0 210.93.105.50 0.0.0.0 eq 23
access-list 10 permit tcp any any
* access-list 100 deny tcp 192.5.5.148 0.0.0.0 210.93.105.50 0.0.0.0 eq 80
access-list 100 permit tcp any any
access-list 100 deny tcp 192.5.5.148 0.0.0.255 210.93.105.50 0.0.0.255 eq 80
access-list 100 permit tcp any any
access-list 100 deny tcp host 192.5.5.148 255.255.255.255 210.93.105.50 255.255.255.255 eq 80
access-list 100 permit tcp any any
18 A router that has two Ethernet interfaces and one serial interface is configured to route both IP and IPX. What is the maximum number of IP ACLs that can be configured to filter packets on this router?
1
2
3
6
* 12
19 Which of the following matches an ACL identification number with the correct protocol?(Choose three.)
0 - standard IP
* 99 - standard IP
* 100 - extended IP
210 - extended IP
678 - extended IPX
* 888 - standard IPX
==============================
V4.0
V4.0
Options with highlight colours are correct answer
1. 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
A will become the DR. D will become the BDR.
A will become the DR. C will remain the BDR.
D will remain the DR. A will become the BDR.
D will remain the DR. C will remain the BDR.
2. 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 192.168.1.200
DROTHER on 192.168.1.200
DR for network 192.168.1.204
BDR for network 192.168.1.204
DROTHER on network 192.168.1.204
3. 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 autonomous system IDs do not match.
OSPF process IDs do not match.
OSPF network types are identical.
OSPF hello or dead timers do not match.
4. 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 internal type 2 OSPF route.
an external OSPF route at least two hops away.
an external OSPF route from two different sources.
an external OSPF route that will not increment in cost.
a default route.
The route was distributed into OSPF from a type 2 router.
5. 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 192.168.0.15/24
192.168.0.0/24 through 192.168.15.0/24
192.168.15.0/24 through 192.168.31.0/24
192.168.15.0/24 through 192.168.255.0/24
192.168.16.0/24 through 192.168.255.0/24
6. Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.168.100.1. What steps must the administrator take to accomplish this?
shut down the loop back interface
use the OSPF router-id 192.168.100.1 command
use the clear ip ospf process command
nothing, the router-id of Router1 is already 192.168.100.1
7. What three parameters must be indentical between OSPF routers in order to form an adjacency? (Choose three.)
area id
K-values
metric value
hello interval network type
interface type
8. 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
B(config-router)# network 10.16.1.0 0.0.0.224 area 0
B(config-router)# network 10.16.1.0 255.255.255.224 area 0
B(config-router)# network 192.168.1.0 255.255.255.255 area 0
B(config-router)# network 10.0.0.0 255.255.255.255 area 0
9. What is the default administrative distance for OSPF?
90
100
110
115
120
10. Refer to the exhibit. What must be received between neighbors to prevent the dead time that is shown in the exhibit from reaching zero?
any traffic through the router interfaces
routing database updates
hello packets
BPDU packets
11. 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)# int fa0/0
B(config-if)# router-id 192.168.1.5
B(config)# int lo0
B(config-if)# ip address 192.168.1.5
B(config)# router ospf 1
B(config-router)# router-id 192.168.1.5
B (config)# router ospf 1
B(config-router)# ip address 192.168.1.5
12. 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?
4
5
6
7
10
13. Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)
Elections are always optional.
Elections are required in all WAN networks.
Elections are required in point-to-point networks. Elections are required in broadcast multiaccess networks.
Elections are sometimes required in NBMA networks.
14. 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.
A 2WAY adjacency is formed.
Router2 will become the DR and Router1 will become the BDR.
Both routers will become DROTHERS.
15. 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?
2
156
1564
1785
1787
16. Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?
2
110
1786
1544
17. 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.)
HQ will be DR for 10.4.0.0/16.
Router A will be DR for 10.4.0.0/16.
HQ will be BDR for 10.4.0.0/16.
Router A will be DR for 10.5.0.0/16.
Remote will be DR for 10.5.0.0/16.
Remote will be BDR for 10.5.0.0/16.
18. Refer to the exhibit. What does the "2" stand for in the router ospf 2 statement?
The number 2 is the autonomous system number.
The number 2 indicates the number of networks advertised by OSPF.
The number 2 identifies this particular instance of OSPF on this router.
The number 2 indicates the priority of the OSPF process on this router.
19. What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)
root router
backup root router
domain router
backup domain router
designated router backup designated router
20. 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)# router ospf 10
RouterB(config-router)# gateway-of-last-resort 172.16.6.6
RouterB(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/0
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
RouterB(config)# router ospf 10
RouterB(config-router)# default-network 172.16.6.6 0.0.0.3 area 0
RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# ip default-route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# redistribute ip default-route
21. 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?
RouterB takes over as DR and RouterD becomes the BDR.
RouterD becomes the BDR and RouterA remains the DR.
RouterD becomes the DR and RouterA becomes the BDR.
RouterC acts as the DR until the election process is complete.
RouterD becomes the DR and RouterB remains the BDR.
There is no change in the DR or BDR until either current DR or BDR goes down.
22. 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?
All routes for the entire network will be present.
Directly connected networks that are operational will be in the routing table.
Because the SPF algorithm has not completed all calculations, no routes will be in the table.
A summary route for all previously learned routes will automatically appear in the routing table until all LSPs have been received by the router.
23. What does OSPF use to calculate the cost to a destination network?
bandwidth
bandwidth and hop count
bandwidth and reliability
bandwidth, load, and reliablity
24. 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?
Router C cannot win a DR election under any circumstances.
If the link for interface 192.168.1.4 goes down, router B will become the new DR.
The highest router ID was most likely determined via an OSPF router-id statement or statements.
If a new router is added with a higher router ID than router D, it will become the DR.
25. Refer to the exhibit. Which network command or set of sommands will cause OSPF to be enabled to send and receive packets for any R1 interface in the exhibited subnets?
R1(config-router)# network 10.0.0.0 0.0.0.0 area 0
R1(config-router)# network 0.0.0.0 255.255.255.255 area 0
R1(config-router)# network 10.1.0.0 0.0.0.255 area 0
R1(config-router)# network 172.16.1.0 0.0.0.3 area 0
R1(config-router)# network 10.0.0.0 0.0.255.255 area 0
R1(config-router)# network 172.16.0.0 0.255.255.255 area 0
A(config)# interface fa0/0 A(config-if)# ip ospf priority 255
A will become the DR. D will become the BDR.
A will become the DR. C will remain the BDR.
D will remain the DR. A will become the BDR.
D will remain the DR. C will remain the BDR.
2. 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 192.168.1.200
DROTHER on 192.168.1.200
DR for network 192.168.1.204
BDR for network 192.168.1.204
DROTHER on network 192.168.1.204
3. 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 autonomous system IDs do not match.
OSPF process IDs do not match.
OSPF network types are identical.
OSPF hello or dead timers do not match.
4. 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 internal type 2 OSPF route.
an external OSPF route at least two hops away.
an external OSPF route from two different sources.
an external OSPF route that will not increment in cost.
a default route.
The route was distributed into OSPF from a type 2 router.
5. 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 192.168.0.15/24
192.168.0.0/24 through 192.168.15.0/24
192.168.15.0/24 through 192.168.31.0/24
192.168.15.0/24 through 192.168.255.0/24
192.168.16.0/24 through 192.168.255.0/24
6. Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.168.100.1. What steps must the administrator take to accomplish this?
shut down the loop back interface
use the OSPF router-id 192.168.100.1 command
use the clear ip ospf process command
nothing, the router-id of Router1 is already 192.168.100.1
7. What three parameters must be indentical between OSPF routers in order to form an adjacency? (Choose three.)
area id
K-values
metric value
hello interval network type
interface type
8. 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
B(config-router)# network 10.16.1.0 0.0.0.224 area 0
B(config-router)# network 10.16.1.0 255.255.255.224 area 0
B(config-router)# network 192.168.1.0 255.255.255.255 area 0
B(config-router)# network 10.0.0.0 255.255.255.255 area 0
9. What is the default administrative distance for OSPF?
90
100
110
115
120
10. Refer to the exhibit. What must be received between neighbors to prevent the dead time that is shown in the exhibit from reaching zero?
any traffic through the router interfaces
routing database updates
hello packets
BPDU packets
11. 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)# int fa0/0
B(config-if)# router-id 192.168.1.5
B(config)# int lo0
B(config-if)# ip address 192.168.1.5
B(config)# router ospf 1
B(config-router)# router-id 192.168.1.5
B (config)# router ospf 1
B(config-router)# ip address 192.168.1.5
12. 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?
4
5
6
7
10
13. Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)
Elections are always optional.
Elections are required in all WAN networks.
Elections are required in point-to-point networks. Elections are required in broadcast multiaccess networks.
Elections are sometimes required in NBMA networks.
14. 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.
A 2WAY adjacency is formed.
Router2 will become the DR and Router1 will become the BDR.
Both routers will become DROTHERS.
15. 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?
2
156
1564
1785
1787
16. Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?
2
110
1786
1544
17. 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.)
HQ will be DR for 10.4.0.0/16.
Router A will be DR for 10.4.0.0/16.
HQ will be BDR for 10.4.0.0/16.
Router A will be DR for 10.5.0.0/16.
Remote will be DR for 10.5.0.0/16.
Remote will be BDR for 10.5.0.0/16.
18. Refer to the exhibit. What does the "2" stand for in the router ospf 2 statement?
The number 2 is the autonomous system number.
The number 2 indicates the number of networks advertised by OSPF.
The number 2 identifies this particular instance of OSPF on this router.
The number 2 indicates the priority of the OSPF process on this router.
19. What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)
root router
backup root router
domain router
backup domain router
designated router backup designated router
20. 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)# router ospf 10
RouterB(config-router)# gateway-of-last-resort 172.16.6.6
RouterB(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/0
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
RouterB(config)# router ospf 10
RouterB(config-router)# default-network 172.16.6.6 0.0.0.3 area 0
RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# ip default-route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# redistribute ip default-route
21. 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?
RouterB takes over as DR and RouterD becomes the BDR.
RouterD becomes the BDR and RouterA remains the DR.
RouterD becomes the DR and RouterA becomes the BDR.
RouterC acts as the DR until the election process is complete.
RouterD becomes the DR and RouterB remains the BDR.
There is no change in the DR or BDR until either current DR or BDR goes down.
22. 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?
All routes for the entire network will be present.
Directly connected networks that are operational will be in the routing table.
Because the SPF algorithm has not completed all calculations, no routes will be in the table.
A summary route for all previously learned routes will automatically appear in the routing table until all LSPs have been received by the router.
23. What does OSPF use to calculate the cost to a destination network?
bandwidth
bandwidth and hop count
bandwidth and reliability
bandwidth, load, and reliablity
24. 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?
Router C cannot win a DR election under any circumstances.
If the link for interface 192.168.1.4 goes down, router B will become the new DR.
The highest router ID was most likely determined via an OSPF router-id statement or statements.
If a new router is added with a higher router ID than router D, it will become the DR.
25. Refer to the exhibit. Which network command or set of sommands will cause OSPF to be enabled to send and receive packets for any R1 interface in the exhibited subnets?
R1(config-router)# network 10.0.0.0 0.0.0.0 area 0
R1(config-router)# network 0.0.0.0 255.255.255.255 area 0
R1(config-router)# network 10.1.0.0 0.0.0.255 area 0
R1(config-router)# network 172.16.1.0 0.0.0.3 area 0
R1(config-router)# network 10.0.0.0 0.0.255.255 area 0
R1(config-router)# network 172.16.0.0 0.255.255.255 area 0
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