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QUESTION 21
You want to enhance the security within the Company LAN and prevent VLAN hopping. What two steps can be taken to help prevent this? (Select two)
A. Enable BPD guard
B. Disable CDP on ports where it is not necessary
C. Place unused ports in a common unrouted VLAN
D. Prevent automatic trunk configuration
E. Implement port security

Correct Answer: CD Explanation
Explanation/Reference:
Explanation:
To prevent VLAN hoping you should disable unused ports and put them in an unused VLAN, or a separate unrouted VLAN. By not granting connectivity or by placing a device into a VLAN not in use, unauthorized access can be thwarted through fundamental physical and logical barriers. Another method used to prevent VLAN hopping is to prevent automatic trunk configuration. Hackers used 802.1Q and ISL tagging attacks, which are malicious schemes that allow a user on a VLAN to get unauthorized access to another VLAN. For example, if a switch port were configured as DTP auto and were to receive a fake DTP packet, it might become a trunk port and it might start accepting traffic destined for any VLAN. Therefore, a malicious user could start communicating with other VLANs through that compromised port. References:
QUESTION 22
The Company network is being flooded with invalid Layer 2 addresses, causing switch CAM tables to be filled and forcing unicast traffic to be transmitted out all switch ports. Which type of Layer 2 attack is being used here?
A. MAC spoofing
B. VLAN hopping
C. MAC address flooding
D. DHCP flooding
E. Session hijacking

Correct Answer: C Explanation
Explanation/Reference:
Explanation: Port security is especially useful in the face of MAC address flooding attacks. In these attacks, an attacker tries to fill up a switch’s CAM tables by sending a large number of frames to it with source MAC addresses that the switch is unaware of at that time. The switch learns about these MAC addresses and puts them in its CAM table, thinking that these MAC addresses actually exist on the port on which it is receiving them. In reality, this port is under the attacker’s control and a machine connected to this port is being used to send frames with spoofed MAC addresses to the switch. If the attacker keeps sending these frames in a large-enough quantity, and the switch continues to learn of them, eventually the switch’s CAM table becomes filled with entries for these bogus MAC addresses mapped to the compromised port. Under normal operations, when a machine receiving a frame responds to it, the switch learns that the MAC address associated with that machine sits on the port on which it has received the response frame. It puts this mapping in its CAM table, allowing it to send any future frames destined for this MAC address directly to this port rather than flood all the ports on the VLAN. However, in a situation where the CAM table is filled up, the switch is unable to create this CAM entry. At this point, when the switch receives a legitimate frame for which it does not know which port to forward the frame to, the switch floods all the connected ports belonging to the VLAN on which it has received the frame. The switch continues to flood the frames with destination addresses that do not have an entry in the CAM tables to all the ports on the VLAN associated with the port it is receiving the frame on. References:
QUESTION 23
A MAC address flood attack is occurring on the Company LAN. During this attack, numerous frames are forwarded to a switch which causes the CAM table to fill to capacity. How does this action benefit the attacker?
A. All traffic is tagged with a specific VLAN ID from the VLAN of the attacker and is now viewable.
B. Clients will forward packets to the attacking device, which will in turn send them to the desired destination but not before recording the traffic patterns.
C. All traffic is redirected to the VLAN that the attacker used to flood the CAM table.
D. All traffic is flooded out all ports and an attacker is able to capture all data.
E. None of the other alternatives apply

Correct Answer: D Explanation
Explanation/Reference:
Explanation:
MAC flooding basically involves bombarding the switch with spoofed ARP requests in the hope of making the switch “fail open”. This, in essence, makes the switch display the characteristics of a hub, where it sends packets to all ports. A MAC flooding attack looks like traffic from thousands or computers moving into one port, but it’s actually the attacker spoofing the MAC address of thousands of non-existent hosts. The goal is to flood the switches CAM (content addressable memory) table, or port/MAC table with these bogus requests, and once flooded, the switch will broadcast openly onto a LAN, allowing the attacker to start sniffing. The success of this attack is almost completely dependant on the model and manufacturer of the switch. References:
QUESTION 24
Which of the following characteristics describe the BPDU Guard feature? (Choose all that apply.)
A. A BPDU Guard port should only be configured on ports with PortFast enabled.
B. BPDU Guard and PortFast should not be enabled on the same port.
C. BPDU Guard is used to ensure that superior BPDUs are not received on a switch port.
D. A BPDU Guard port receiving a BPDU will go into err-disable state.
E. A BPDU Guard port receiving a BPDU will be disabled.
F. BPDU Guard can be enabled on any switch port.

Correct Answer: AE Explanation
Explanation/Reference:
Explanation:
QUESTION 25
Which of the following are valid modes of accessing the data plane? (Choose all that apply.)
A. Serial connection
B. Secure Shell
C. RADIUS
D. Simple Network Management Protocol
E. HTTP
F. Telnet

Correct Answer: ABDEF Explanation
Explanation/Reference:
Explanation:
QUESTION 26
Which of the following is not an essential prerequisite for AutoQoS to be correctly applied to an interface? (Choose all that apply.)
A. The interface must be configured as a Multilink PPP interface.
B. The correct bandwidth should be configured on the interface.
C. A QoS policy must not be currently attached to the interface.
D. CEF must be enabled.
E. AutoQoS must be enabled globally before it can be enabled on the interface.
F. An IP address must be configured on the interface if its speed is equal to or less than 768 kbps.

Correct Answer: AE Explanation
Explanation/Reference:
Explanation:
QUESTION 27
Which of the following topology situations would be a qood candidate for configuring DMVPN?
A. Extranet VPN
B. Managed overlay VPN topology
C. Hub-and-spoke VPN topology
D. Central-site VPN topology
E. Full mesh VPN topology
F. Remote-access VPN topology
Correct Answer: E Explanation

Explanation/Reference:
Explanation:
QUESTION 28
Which of the following is not considered a common approach to narrow the field of potential problem causes? (Choose the best answer.)
A. Following the traffic path
B. Top-down
C. Comparing configurations
D. Bottom-up
E. Divide and conquer
F. Examine SLAs

Correct Answer: F Explanation
Explanation/Reference:
Explanation:
QUESTION 29
Which of the following best describes the following command: ip flow-export destination 192.168.1.50 1500?
A. it is not a valid NetFlow command.
B. it is an SNMP command that exports 1500-byte packets to IP address 192.168.1.50.
C. it is a NetFlov/ command that v/ill export 1500-byte packets to IP address 192.168.1.50.
D. it is a NetFlov/ command that allows IP address 192.168.1.50 to send traffic to port 1500.
E. It is a NetFlov/ command that v/ill specify that the NetFlov/ collector’s IP address is 192.168.1.50 over UDP port 1500.
F. It is an SNMP command that exports flows to destination address 1Q2.168.1.50 for packets up to an MTU of 1500.

Correct Answer: E Explanation
Explanation/Reference:
Explanation:
QUESTION 30
Which of the following are valid methods of providing a router with information concerning the location of the RP? (Choose all that apply.)
A. Statically defined RP
B. Bootstrap Router
C. Auto-RP
D. RP Discovery Protocol (RDP)
E. RP Helios
F. RPARP(RARP)
Correct Answer: ABC Explanation

Explanation/Reference:
Explanation:

Question Set 1
QUESTION 1
FCAPS is a network maintenance model defined by ISO. FCAPS stands for:
Select and Place:

Correct Answer:

Explanation
Explanation/Reference:
Explanation:
F-> Fault Management C-> Configuration Management A -> Accounting Management
The FCAPS maintenance model consists of the following: FCAPS Maintenance Tasks:
QUESTION 2
There are many Network Maintenance models. Match the model names on the left to the options on the right:
Select and Place: Correct Answer:
Explanation
Explanation/Reference:
Explanation:
FCAPS -> Fault, Configuration, Accounting, Performance and Security (ISO) ITIL -> A collection of best practice recommendations Cisco Lifecycle -> Often referred to as the PPDIOO model TMN -> Telecommunications Management Network
Well Known Network Maintenance Models Maintenance models Model
Explanation FCAPS Fault-, Configuration-, Accounting-, Performance- and Security management defined by ISO ITIL IT Infrastructure Library Defines a collection of best-practice recommendations that work together to meet business goals. TMN Telecommunications Management Network ITU-T variation of FCAPS – See above – specially targeted towards Tele Communication Networks PPDIOO Also called Cisco Lifecycle Services (See drawing below) PPDIOO Life Cycle References:

QUESTION 3
Match the items on the left to their purpose on the right
Select and Place:

Correct Answer: Explanation

Explanation/Reference:
Explanation:
EEM -> CLI based Management and Monitoring
SDM -> Provides a GUI for Administration
FTP -> Used for Backup and Restore

Cisco IOS Embedded Event Manager (EEM) is a powerful and flexible CLI based subsystem that provides
real-time network event detection and onboard automation. It gives you the ability to adapt the behavior of
your network devices to align with your business needs.

Cisco SDM is an intuitive, Web-based device-management tool for Cisco IOS. Software-based routers.
The Cisco SDM simplifies router and security configuration through smart wizards, which help customers
and Cisco partners quickly and easily deploy, configure, and monitor a Cisco router without requiring
knowledge of the command-line interface (CLI). The Cisco SDM is supported on a wide range of Cisco
routers and Cisco IOS Software releases.

Cisco devices can use FTP to backup and restore configuration files and IOS software. Some examples of
this are shown below:

Example 1: Backing up manually
R1# copy startup-config ftp://kevin:[email protected] Address or name of remote host
[ 192.168.22.33]?
Destination file name [r1-confg]?
Writing R1-confg !!!
3458 bytes copied in 3.443 secs (1243 bytes/sec)

Example 2: Backing up automatically
The configuration below will make a backup:

write-memory Trigger backup when running-config is copied to nvram time-period 1440 Trigger backup
every 1440 minuttes. 60*24=1440 !
ip ftp username kevin
ip ftp password dj7jS
!
archive
path ftp://192.168.2.33/R1-config
write-memory
time-period 1440Viewing

R1#show archive
The next archive file will be named ftp://192.168.2.33/R1-confg-4 Archive # Name
1 ftp://192.168.2.33/R1-confg-1
2 ftp://192.168.2.33/R1-confg-2
3 ftp://192.168.2.33/R1-confg-3 <- Most Recent

Testlet 1

Topic 3, Ticket 1 : Switch Port Trunk
Topology Overview (Actual Troubleshooting lab design is for below network design)
The company has created the test bed shown in the layer 2 and layer 3 topology exhibits. This network
consists of four routers, two layer 3 switches and two layer 2 switches.

In the IPv4 layer 3 topology, R1, R2, R3, and R4 are running OSPF with an OSPF process number 1.
DSW1, DSW2 and R4 are running EIGRP with an AS of 10. Redistribution is enabled where necessary.
R1 is running a BGP AS with a number of 65001. This AS has an eBGP connection to AS 65002 in the
ISP’s network. Because the company’s address space is in the private range. R1 is also providing NAT
translations between the inside (10.1.0.0/16 & 10.2.0.0/16) networks and outside (209.65.0.0/24) network.
ASW1 and ASW2 are layer 2 switches.
NTP is enabled on all devices with 209.65.200.226 serving as the master clock source. The client
workstations receive their IP address and default gateway via R4’s DHCP server. The default gateway
address of 10.2.1.254 is the IP address of HSRP group 10 which is running on DSW1 and DSW2.
In the IPv6 layer 3 topology R1, R2, and R3 are running OSPFv3 with an OSPF process number 6. DSW1,
DSW2 and R4 are running RIPng process name RIP_ZONE. The two IPv6 routing domains, OSPF 6 and
RIPng are connected via GRE tunnel running over the underlying IPv4 OSPF domain. Redistrution is
enabled where necessary.

Recently the implementation group has been using the test bed to do a `proof-of-concept’ on several
implementations. This involved changing the configuration on one or more of the devices. You will be
presented with a series of trouble tickets related to issues introduced during these configurations.

Note: Although trouble tickets have many similar fault indications, each ticket has its own issue and
solution.

Each ticket has 3 sub questions that need to be answered & topology remains same.
Question-1 Fault is found on which device,
Question-2 Fault condition is related to,
Question-3 What exact problem is seen & what needs to be done for solution
========================================================================= ======

Client is unable to ping IP 209.65.200.241
Solution Steps need to follow as below:-Ipconfig —– Client will be getting 169.X.X.X
Sh run ——- & check for running config of int fa1/0/1 & fa1/0/2 ==================================================== interface FastEthernet1/0/1switchport mode accessswitchport access vlan 10interface FastEthernet1/0/2switchport mode accessswitchport access vlan 10 ====================================================

int range portchannel13,portchannel23 switchport trunk allowed vlan none switchport trunk allowed vlan 10,200
So in ticket Answer to the fault condition will be as :
QUESTION 1
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, and FHRP services, a trouble ticket has been operated indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to Isolated the cause of this fault and answer the following questions. On which device is the fault condition located?
A. R1
B. R2
C. R3
D. R4
E. DSW1
F. DSW2
G. ASW1
H. ASW2
Correct Answer: G Explanation
Explanation/Reference:
Explanation: Since the Clients are getting an APIPA we know that DHCP is not working. However, upon closer examination of the ASW1 configuration we can see that the problem is not with DHCP, but the fact that the trunks on the port channels are only allowing VLANs 1-9, when the clients belong to VLAN
10. VLAN 10 is not traversing the trunk on ASW1, so the problem is with the trunk configuration on ASW1.
QUESTION 2
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, and FHRP services, a trouble ticket has been opened indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to isolated the cause of this fault and answer the following questions. The fault condition is related to which technology?
A. NTP
B. Switch-to-Switch Connectivity
C. Access Vlans
D. Port Security
E. VLAN ACL / Port ACL
F. Switch Virtual Interface
Correct Answer: B Explanation
Explanation/Reference:
Explanation:
Since the Clients are getting an APIPA we know that DHCP is not working. However, upon closer examination of the ASW1 configuration we can see that the problem is not with DHCP, but the fact that the trunks on the port channels are only allowing VLANs 1-9, when the clients belong to VLAN
10. VLAN 10 is not traversing the trunk on ASW1, so the problem is with switch to switch connectivity, specifically the trunk configuration on ASW1.
QUESTION 3
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, and FHRP services, a trouble ticket has been opened indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to isolated the cause of this fault and answer the following questions. What is the solution to the fault condition?
A. In Configuration mode, using the interface port-channel 13 command, then configure switchport trunk allowed vlan none followed by switchport trunk allowed vlan 20,200 commands.
B. In Configuration mode, using the interface port-channel 13, port-channel 23, then configure switchport trunk none allowed vlan none followed by switchport trunk allowed vlan 10,200 commands.
C. In Configuration mode, using the interface port-channel 23 command, then configure switchport trunk allowed vlan none followed by switchport trunk allowed vlan 20,200 commands.
D. In Configuration mode, using the interface port-channel 23, port-channel, then configure switchport trunk allowed vlan none followed by switchport trunk allowed vlan 10,20,200 commands.
Correct Answer: B Explanation
Explanation/Reference:
Explanation:
We need to allow VLANs 10 and 200 on the trunks to restore full connectivity. This can be accomplished by issuing the “switchport trunk allowed vlan 10,200” command on the port channels used as trunks in DSW1.
========================================================================= =====
Testlet 1
Topic 4, Ticket 2 : ACCESS VLAN
Topology Overview (Actual Troubleshooting lab design is for below network design)
The company has created the test bed shown in the layer 2 and layer 3 topology exhibits. This network
consists of four routers, two layer 3 switches and two layer 2 switches.

In the IPv4 layer 3 topology, R1, R2, R3, and R4 are running OSPF with an OSPF process number 1.
DSW1, DSW2 and R4 are running EIGRP with an AS of 10. Redistribution is enabled where necessary.
R1 is running a BGP AS with a number of 65001. This AS has an eBGP connection to AS 65002 in the
ISP’s network. Because the company’s address space is in the private range. R1 is also providing NAT
translations between the inside (10.1.0.0/16 & 10.2.0.0/16) networks and outside (209.65.0.0/24) network.
ASW1 and ASW2 are layer 2 switches.
NTP is enabled on all devices with 209.65.200.226 serving as the master clock source. The client
workstations receive their IP address and default gateway via R4’s DHCP server. The default gateway
address of 10.2.1.254 is the IP address of HSRP group 10 which is running on DSW1 and DSW2.

In the IPv6 layer 3 topology R1, R2, and R3 are running OSPFv3 with an OSPF process number 6. DSW1,
DSW2 and R4 are running RIPng process name RIP_ZONE. The two IPv6 routing domains, OSPF 6 and
RIPng are connected via GRE tunnel running over the underlying IPv4 OSPF domain. Redistrution is
enabled where necessary.

Recently the implementation group has been using the test bed to do a `proof-of-concept’ on several
implementations. This involved changing the configuration on one or more of the devices. You will be
presented with a series of trouble tickets related to issues introduced during these configurations.

Note: Although trouble tickets have many similar fault indications, each ticket has its own issue and
solution.

Each ticket has 3 sub questions that need to be answered & topology remains same.
Question-1 Fault is found on which device,
Question-2 Fault condition is related to,
Question-3 What exact problem is seen & what needs to be done for solution
========================================================================= ======

Client is unable to ping IP 209.65.200.241
Solution Steps need to follow as below:-Ipconfig —– Client will be getting 169.X.X.X
Sh run ——- & check for running config of int fa1/0/1 & fa1/0/2 ====================================================

====================================================
So in ticket Answer to the fault condition will be as:
QUESTION 1
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, layer 2 connectivity, FHRP services, and device security, a trouble ticket has been opened indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to isolated the cause of this fault and answer the following questions. What is the solution to the fault condition?
A. R1
B. R2
C. R3
D. R4
E. DSW1
F. DSW2
G. ASW1
H. ASW2
Correct Answer: G Explanation
Explanation/Reference:
Explanation:
QUESTION 2
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, layer 2 connectivity, FHRP services, and device security, a trouble ticket has been opened indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to isolated the cause of this fault and answer the following questions. The fault condition is related to switch technology?
A. NTP
B. Switch-to-Switch Connectivity
C. Loop Prevention
D. Access Vlans
E. VLAN ACL Port ACL
F. Switch Virtual Interface
G. Port Security
Correct Answer: D Explanation
Explanation/Reference:
Explanation:
QUESTION 3
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, layer 2 connectivity, FHRP services, and device security, a trouble ticket has been opened indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to isolated the cause of this fault and answer the following questions. What is the solution to the fault condition?
A. In Configuration mode, using the interface range Fastethernet 1/0/1 2, then switchport mode access vlan 10 command.
B. In Configuration mode, using the interface range Fastethernet 1/0/1 2, then switchport access mode vlan 10 command.
C. In Configuration mode, using the interface range Fastethernet 1/0/1 2, then switchport vlan 10 access command.
D. In Configuration mode, using the interface range Fastethernet 1/0/1 2, then switchport access vlan 10 command.
Correct Answer: D Explanation
Explanation/Reference:
Explanation:
========================================================================= ======
Testlet 1
Topic 5, Ticket 3 : OSPF Authentication
Topology Overview (Actual Troubleshooting lab design is for below network design)
The company has created the test bed shown in the layer 2 and layer 3 topology exhibits. This network
consists of four routers, two layer 3 switches and two layer 2 switches.

In the IPv4 layer 3 topology, R1, R2, R3, and R4 are running OSPF with an OSPF process number 1.
DSW1, DSW2 and R4 are running EIGRP with an AS of 10. Redistribution is enabled where necessary.
R1 is running a BGP AS with a number of 65001. This AS has an eBGP connection to AS 65002 in the
ISP’s network. Because the company’s address space is in the private range. R1 is also providing NAT
translations between the inside (10.1.0.0/16 & 10.2.0.0/16) networks and outside (209.65.0.0/24) network.
ASW1 and ASW2 are layer 2 switches.
NTP is enabled on all devices with 209.65.200.226 serving as the master clock source. The client
workstations receive their IP address and default gateway via R4’s DHCP server. The default gateway
address of 10.2.1.254 is the IP address of HSRP group 10 which is running on DSW1 and DSW2.

In the IPv6 layer 3 topology R1, R2, and R3 are running OSPFv3 with an OSPF process number 6. DSW1,
DSW2 and R4 are running RIPng process name RIP_ZONE. The two IPv6 routing domains, OSPF 6 and
RIPng are connected via GRE tunnel running over the underlying IPv4 OSPF domain. Redistrution is
enabled where necessary.

Recently the implementation group has been using the test bed to do a `proof-of-concept’ on several
implementations. This involved changing the configuration on one or more of the devices. You will be
presented with a series of trouble tickets related to issues introduced during these configurations.

Note: Although trouble tickets have many similar fault indications, each ticket has its own issue and
solution.

Each ticket has 3 sub questions that need to be answered & topology remains same.
Question-1 Fault is found on which device,
Question-2 Fault condition is related to,
Question-3 What exact problem is seen & what needs to be done for solution
========================================================================= ======

Client is unable to ping IP 209.65.200.241
Solution Steps need to follow as below:-Ipconfig —– Client will be receiving IP address 10.2.1.3

sh ip ospf nei —– Only one neighborship is forming with R2 & i.e. with R3 Since R2 is connected to R1 & R3 with routing protocol ospf than there should be 2 neighbors seen but only one is seen Sh run ————————– Interface Serial0/0/0/0.12 on R2

Sh run ————————– Interface Serial0/0/0/0 on R1
So in ticket Answer to the fault condition will be as below for
QUESTION 1
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, layer 2 connectivity, FHRP services, and device security, a trouble ticket has been opened indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to isolated the cause of this fault and answer the following questions. On which device is the fault condition located?
A. R1
B. R2
C. R3
D. R4
E. DSW1
F. DSW2
G. ASW1
H. ASW2
Correct Answer: A Explanation
Explanation/Reference:
Explanation:
QUESTION 2
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, layer 2 connectivity, FHRP services, and device security, a trouble ticket has been opened indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to isolated the cause of this fault and answer the following questions. The fault condition is related to which technology?
A. BGP
B. NTP
C. IP NAT
D. IPv4 OSPF Routing
E. IPv4 OSPF Redistribution
F. IPv6 OSPF Routing
G. IPv4 layer 3 security
Correct Answer: D Explanation
Explanation/Reference:
Explanation:
QUESTION 3
The implementations group has been using the test bed to do a `proof-of-concept’ that requires both Client 1 and Client 2 to access the WEB Server at 209.65.200.241. After several changes to the network addressing, routing scheme, DHCP services, NTP services, layer 2 connectivity, FHRP services, and device security, a trouble ticket has been opened indicating that Client 1 cannot ping the 209.65.200.241 address. Use the supported commands to isolated the cause of this fault and answer the following questions. What is the solution to the fault condition?
A. Enable OSPF authentication on the s0/0/0 interface using the ip ospf authentication message-digest command
B. Enable OSPF routing on the s0/0/0 interface using the network 10.1.1.0 0.0.0.255 area 12 command.
C. Enable OSPF routing on the s0/0/0 interface using the network 209.65.200.0 0.0.0.255 area 12 command.
D. Redistribute the BGP route into OSPF using the redistribute BGP 65001 subnet command.
Correct Answer: A Explanation
Explanation/Reference:
Explanation:

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