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Q31. - (Topic 21) 

The implementation group has been using the test bed to do an IPv6 'proof-of-concept1. After several changes to the network addressing and routing schemes, a trouble ticket has been opened indicating that the loopback address on R1 (2026::111:1) is not able to ping the loopback address on DSW2 (2026::102:1).

Use the supported commands to isolate the cause of this fault and answer the following question.

What is the solution to the fault condition?

A. Under the interface Tunnel34 configuration delete the tunnel mode ipv6 command.

B. Under the interface Serial0/0/0.34 configuration enter the ipv6 address 2026::34:1/122 command.

C. Under the interface Tunnel34 configuration enter the ip address unnumbered Serial0/0/0.34 command.

D. Under the interface Tunnel34 configuration delete the tunnel source Serial0/0/0.34 command and enter the tunnel source 2026::34:1/122 command.

Answer: A

Explanation:

As explained earlier, the problem is with route misconfigured tunnel modes on R3. R3 is using tunnel mode ipv6, while R4 is using the default of GRE. We need to remove the "tunnel mode ipv6" command under interface Tunnel34


Q32. - (Topic 4) 

Scenario: 

You have been asked by your customer to help resolve issues in their routed network. Their network engineer has deployed HSRP. On closer inspection HSRP doesn't appear to be operating properly and it appears there are other network problems as well. You are to provide solutions to all the network problems. 

The following debug messages are noticed for HSRP group 2. But still neither R1 nor R2 has identified one of them as standby router. Identify the reason causing the issue. 

Note: only show commands can be used to troubleshoot the ticket. 

R1# 

'Mar 26 11:17:39.234: HSRP: Et1/0 Grp 2 Hello out 172.16.20.2 Active pri 100 vIP 

172.16.20.254 

'Mar 26 11:17:40.034: HSRP: EtO/0 Grp 1 Hello out 172.16.10.2 Active prj 130 vIP 

172.16.10.254 

R1# 

'Mar 26 11:17:40.364: HSRP: EtO/0 Grp 1 Hello in 172.16.10.1 Standby pri 100 vIP 

172.16.10.254 

R1# 

'Mar 26 11:17:41.969: HSRP: Et1/0 Grp 2 Hello out 172.16.20.2 Active pri 100 vIP 172.16.20.254 

'Mar 26 11:17:42.719: HSRP: EtO/0 Grp 1 Hello out 172.16.10.2 Active prj 130 vIP 

172.16.10.254 

'Mar 26 11:17:42.918: HSRP: EtO/0 Grp 1 Hello in 172.16.10.1 Standby pri 100 vIP 

172.16.10.254 

R1# 

'Mar 26 11:17:44.869: HSRP: Et1/0 Grp 2 Hello out 172.16.20.2 Active pri 100 vIP 

172.16.20.254 

'Mar 26 11:17:45.485: HSRP: EtO/0 Grp 1 Hello out 172.16.10.2 Active prj 130 vIP 

172.16.10.254 

'Mar 26 11:17:45.718: HSRP: EtO/0 Grp 1 Hello in 172.16.10.1 Standby pri 100 vIP 

172.16.10.254 

R1# 

'Mar 26 11:17:47.439: HSRP: Et1/0 Grp 2 Hello out 172.16.20.2 Active pri 100 vIP 

172.16.20.254 

'Mar 26 11:17:48.252: HSRP: EtO/0 Grp 1 Hello in 172.16.10.1 Standby pri 100 vIP 

172.16.10.254 

'Mar 26 11:17:48.322: HSRP: EtO/0 Grp 1 Hello out 172.16.10.2 Active prj 130 vIP 

172.16.10.254 

R1# 

'Mar 26 11:17:50.389: HSRP: Et1/0 Grp 2 Hello out 172.16.20.2 Active pri 100 vIP 

172.16.20.254 

'Mar 26 11:17:50.735: HSRP: EtO/0 Grp 1 Hello in 172.16.10.1 Standby pri 100 vIP 

172.16.10.254 

'Mar 26 11:17:50.921: HSRP: EtO/0 Grp 1 Hello out 172.16.10.2 Active prj 130 vIP 

172.16.10.254 

R1# 

'Mar 26 11:17:53.089: HSRP: Et1/0 Grp2 Hello out 172.16.20.2 Active pri 100 vIP 

172.16.20.254 

'Mar 26 11:17:53.338: HSRP: EtO/0 Grp 1 Hello out 172.16.10.2 Active pri130vlP 

172.16.10.254 

'Mar 26 11:17:53.633: HSRP: EtO/0 Grp 1 Hello in 172.16.10.1 Standby pri 100 vIP 

172.16.10.254 

A. HSRP group priority misconfiguration 

B. There is an HSRP authentication misconfiguration 

C. There is an HSRP group number mismatch 

D. This is not an HSRP issue: this is DHCP issue. 

E. The ACL applied to interface is blocking HSRP hello packet exchange 

Answer:

Explanation: 

On R1 we see that access list 102 has been applied to the Ethernet 1/0 interface: 

This access list is blocking all traffic to the 224.0.0.102 IP address, which is the multicast address used by HSRP. 

Topic 5, Troubleshooting OSPF 

17. - (Topic 5) 

Scenario: 

A customer network engineer has edited their OSPF network configuration and now your customer is experiencing network issues. They have contacted you to resolve the issues and return the network to full functionality. 

Connectivity from R3 to R4, R5 and R6 has been lost. How should connectivity be reestablished? 

A. Configure R4 with a virtual link to 192.168.13.2 

B. Change the R3 and R4 hello-interval and retransmit-interface timers to zero so the link won't go down. 

C. Add an OSPF network statement for 4.4.4.4 0.0.0.0 area 1 in R3 

D. Add an OSPF network statement for 192.168.34.3 0.0.0.255 area 2 in R3 

E. Add an OSPF network statement for 192.168.34.0 0.0.0.255 area 1 in R3 

Answer:

Explanation: 

Based on the network diagram, we know that a virtual link will need to be configured to logically connect area 2 to the back area 0. However, this is not the problem as we can see that R3 has been correctly configured to do this. It is, however, missing the network statement for the link to R4. Here, we see that the link to R4 is using the 192.168.34.0 network, but that this network has not been added to OSPF 

Based on the network diagram, this link should be added to Area 1, not Area 2. 


Q33. - (Topic 13) 

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. NTP 

B. IP DHCP Server 

C. IPv4 OSPF Routing 

D. IPv4 EIGRP Routing 

E. IPv4 Route Redistribution 

F. IPv6 RIP Routing 

G. IPv6 OSPF Routing 

H. IPv4 and IPv6 Interoperability 

I. IPv4 layer 3 security 

Answer:

Explanation: 

On R4, in the redistribution of EIGRP routing protocol, we need to change name of route-map to resolve the issue. It references route-map OSPF_to_EIGRP but the actual route map is called OSPF->EIGRP. 


Q34. - (Topic 1)

When troubleshooting an EIGRP connectivity problem, you notice that two connected EIGRP routers are not becoming EIGRP neighbors. A ping between the two routers was successful. What is the next thing that should be checked?

A. Verify that the EIGRP hello and hold timers match exactly.

B. Verify that EIGRP broadcast packets are not being dropped between the two routers with the show ip EIGRP peer command.

C. Verify that EIGRP broadcast packets are not being dropped between the two routers with the show ip EIGRP traffic command.

D. Verify that EIGRP is enabled for the appropriate networks on the local and neighboring router.

Answer: D


Q35. - (Topic 20) 

The implementation group has been using the test bed to do an IPv6 'proof-of-concept1. After several changes to the network addressing and routing schemes, a trouble ticket has been opened indicating that the loopback address on R1 (2026::111:1) is not able to ping the loopback address on DSW2 (2026::102:1).

Use the supported commands to isolate the cause of this fault and answer the following question.

What is the solution to the fault condition?

A. Under the interface Tunnel34 configuration enter the ipv6 ospf 6 area 34 command.

B. Under the interface Loopback6 configuration enter the ipv6 ospf 6 area 34 command.

C. Under the interface Serial0/0/0.34 configuration enter the ipv6 ospf 6 area 34 command.

D. Under ipv6 router ospf 6 configuration enter the redistribute rip RIP_ZONE include-connected command.

Answer: D

Explanation:

As explained earlier, the problem is with route redistribution on R4 of not redistributing RIP routes into OSPF for IPV6.

Topic 21, Ticket 16: IPv6 Routing Issue 3

Topology Overview (Actual Troubleshooting lab design is for below network design)

-Client Should have IP 10.2.1.3

-EIGRP 100 is running between switch DSW1 & DSW2

-OSPF (Process ID 1) is running between R1, R2, R3, R4

-Network of OSPF is redistributed in EIGRP

-BGP 65001 is configured on R1 with Webserver cloud AS 65002

-HSRP is running between DSW1 & DSW2 Switches

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

===============================================================================


Q36. - (Topic 16) 

The implementations group has been using the test bed to do a ‘proof-of-concept'. After several changes to the network addressing, routing schemes, a trouble ticket has been opened indicating that the loopback address on R1 (2026::111:1) is not able to ping the loopback address on DSW2(2026::102:1). 

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. IPv4 OSPF Routing 

C. IPv6 OSPF Routing 

D. IPv4 layer 3 security 

Answer:

Explanation: 

On R2, IPV6 OSPF routing, configuration is required to add ipv6 ospf 6 area 0 under interface serial 0/0/0.23 


Q37. - (Topic 2) 

A customer network engineer has made configuration changes that have resulted in some loss of connectivity. You have been called in to evaluate a switch network and suggest resolutions to the problems. 

Refer to the topology. 

SW1 Switch Management IP address is not pingable from SW4. What could be the issue? 

A. Management VLAN not allowed in the trunk links between SW1 and SW4 

B. Management VLAN not allowed in the trunk links between SW1 and SW2 

C. Management VLAN not allowed in the trunk link between SW2 and SW4 

D. Management VLAN ip address on SW4 is configured in wrong subnet 

E. Management VLAN interface is shutdown on SW4 

Answer:

Explanation: 

In the network, VLAN 300 is called the Management VLAN. Based on the configurations shown below, SW1 has VLAN 300 configured with the IP address of 192.168.10.1/24, while on SW4 VLAN 300 has an IP address of 192.168.100.4/24, which is not in the same subnet. 


Q38. - (Topic 5) 

Scenario: A customer network engineer has edited their OSPF network configuration and now your customer is experiencing network issues. They have contacted you to resolve the issues and return the network to full functionality. 

The 6.6.0.0 subnets are not reachable from R4. how should the problem be resolved? 

A. Edit access-list 46 in R6 to permit all the 6.6.0.0 subnets 

B. Apply access-list 46 in R6 to a different interface 

C. Apply access-list 1 as a distribute-list out under router ospf 100 in R4 

D. Remove distribute-list 64 out on R6 E. Remove distribute-list 1 in ethernet 0/1 in R4 

F. Remove distribute-list 1 in ethernet 0/0 in R4 

Answer:

Explanation: 

Here we see from the running configuration of R6 that distribute list 64 is being used in the outbound direction to all OSPF neighbors. 

However, no packets will match the 6.6.0.0 in this access list because the first line blocks all 6.0.0.0 networks, and since the 6.6.0.0 networks will also match the first line of this ACL, these OSPF networks will not be advertised because they are first denied in the first line of the ACL.