Cisco 300-135 ExamTSHOOT Troubleshooting and Maintaining Cisco IP Networks

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2016 Dec examcollection 300-135:

Q1. - (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

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


Q2. - (Topic 10) 

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 schemes, 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 

Answer:

Explanation: 

On R1 we need to add the client IP address for reachability to server to the access list that is used to specify which hosts get NATed. 


Q3. - (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. 

What is the solution to fault condition? 

A. Under the interface Serial 0/0/0.23 configuration enter the ipv6 ospf 6 area 0 command. 

B. Under the interface Serial0/0/0.12 configuration enter the ipv6 ospf 6 area 12 command. 

C. Under ipv6 router ospf 6 configuration enter the network 2026::1:/122 area 0 command. 

D. Under ipv6 router ospf 6 configuration enter no passive-interface default command. 

Answer:

Explanation: 

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


Q4. - (Topic 6) 

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. 

Answer:

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. 


Q5. - (Topic 12) 

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. Switch-to-Switch Connectivity 

C. Access Vlans 

D. Port Security 

E. VLAN ACL / Port ACL 

F. Switch Virtual Interface 

Answer:

Explanation: Port security is causing the connectivity issues. On ASW1, we need to remove port-security under interface fa1/0/1 & fa1/0/2. 

Topic 13, Ticket 8 : Redistribution of EIGRP to OSPF 

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 

Client is unable to ping IP 209.65.200.241 

Solution 

Steps need to follow as below:-

. When we check on client 1 & Client 2 desktop we are not receiving DHCP address from R4 

ipconfig ----- Client will be receiving IP address 10.2.1.3 

. IP 10.2.1.3 will be able to ping from R4 , but cannot ping from R3, R2, R1 

. This clearly shows problem at R4 since EIGRP is between DSW1, DSW2 & R4 and OSPF protocol is running between R4, R3, R2, R1 so routes from R4 are not propagated to R3, R2, R1 

. Since R4 is able to ping 10.2.1.3 it means that routes are received in EIGRP & same needs to be advertised in OSPF to ping from R3, R2, R1. 

. Need to check the routes are being advertised properly or not in OSPF & EIGRP vice-versa. 

. From above snap shot it clearly indicates that redistribution done in EIGRP is having problem & by default all routes are denied from ospf to EIGRP… so need to change route-map name. 

. Change required: 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. 


Renew tshoot 300-135 exam:

Q6. - (Topic 1)

Exhibit:

A network administrator is troubleshooting an EIGRP connection between RouterA, IP address 10.1.2.1, and RouterB, IP address 10.1.2.2. Given the debug output on RouterA, which two statements are true? (Choose two.)

A. RouterA received a hello packet with mismatched autonomous system numbers.

B. RouterA received a hello packet with mismatched hello timers.

C. RouterA received a hello packet with mismatched authentication parameters.

D. RouterA received a hello packet with mismatched metric-calculation mechanisms.

E. RouterA will form an adjacency with RouterB.

F. RouterA will not form an adjacency with RouterB.

Answer: D,F


Q7. - (Topic 8) 

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 

Answer:

Explanation: 

On R1, for IPV4 authentication of OSPF the command is missing and required to configure------ ip ospf authentication message-digest 


Q8. - (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. 

After resolving the issues between R3 and R4. Area 2 is still experiencing routing issues. Based on the current router configurations, what needs to be resolved for routes to the networks behind R5 to be seen in the company intranet? 

A. Configure R4 and R5 to use MD5 authentication on the Ethernet interfaces that connect to the common subnet. 

B. Configure Area 1 in both R4 and R5 to use MD5 authentication. 

C. Add ip ospf authentication-key 7 BEST to the R4 Ethernet interface that connects to R5 and ip ospf authentication-key 7 BEST to R5 Ethernet interface that connects to R4. 

D. Add ip ospf authentication-key CISCO to R4 Ethernet 0/1 and add area 2 authentication to the R4 OSPF routing process. 

Answer:

Explanation: 

Here, we see from the running configuration of R5 that OSPF authentication has been configured on the link to R4: 

However, this has not been done on the link to R5 on R4: 


Q9. - (Topic 19) 

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.

On which device is the fault condition located?

A. R1

B. R2

C. R3

D. R4

E. DSW1

F. DSW2

G. ASW1

H. ASW2

Answer: B

Explanation:

Start to troubleshoot this by pinging the loopback IPv6 address of DSW2 (2026::102:1). This can be pinged from DSW1, R4, and R3, which leads us to believe that the issue is with R2. Going further, we can see that R2 only has an IPV6 OSPF neighbor of R1, not R3:

We can then see that OSPFv3 has not been enabled on the interface to R3:

So the problem is with R2, related to IPV6 Routing, and the fix is to enable the "ipv6 ospf 6 area 0" command under the serial 0/0/0.23 interface.


Q10. - (Topic 17) 

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 schemes, DHCP services, NTP services, layer 2 connectivity, FHRP services, and device security, a trouble ticket has been opened DSW1 will not become the active router for HSRP group 10. 

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. Under the interface vlan 10 configuration enter standby 10 preempt command. 

B. Under the track 1 object configuration delete the threshold metric up 1 down 2 command and enter the threshold metric up 61 down 62 command. 

C. Under the track 10 object configuration delete the threshold metric up 61 down 62 command and enter the threshold metric up 1 down 2 command. 

D. Under the interface vlan 10 configuration delete the standby 10 track1 decrement 60 command and enter the standby 10 track 10 decrement 60 command. 

Answer:

Explanation: 

On DSW1, related to HSRP, under VLAN 10 change the given track 1 command to instead use the track 10 command. 


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