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2021 Dec cisco ccnp routing/switching 300-135 tshoot:

Q1. - (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.

Which of statement is true regarding STP issue identified with switches in the given topology?

A. Loopguard configured on the New_Switch places the ports in loop inconsistent state

B. Rootguard configured on SW1 places the ports in root inconsistent state

C. Bpduguard configured on the New_Switch places the access ports in error-disable

D. Rootguard configured on SW2 places the ports in root inconsistent state

Answer: A

Explanation:

On the new switch, we see that loopguard has been configured with the "spanning-tree guard loop" command.

The loop guard feature makes additional checks. If BPDUs are not received on a non-designated port, and loop guard is enabled, that port is moved into the STP loop-inconsistent blocking state, instead of the listening / learning / forwarding state. Without the loop guard feature, the port assumes the designated port role. The port moves to the STP forwarding state and creates a loop.

Q2. - (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.

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: D

Explanation:

Start to troubleshoot this by pinging the loopback IPv6 address of DSW2 (2026::102:1). This can be pinged from DSW1, and R4, but not R3 or any other devices past that point. If we look at the diagram, we see that R4 is redistributing the OSPF and RIP IPV6 routes. However, looking at the routing table we see that R4 has the 2026::102 network in the routing table known via RIP, but that R3 does not have the route:

When we look more closely at the configuration of R4, we see that it is redistributing OSPF routes into RIP for IPv6, but the RIP routes are not being redistributed into OSPF. That is why R3 sees R4 as an IPV6 OSPF neighbor, but does not get the 2026::102 network installed.

So, problem is with route redistribution on R4.

Q3. - (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: D

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:

Q4. - (Topic 15)

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. Under the global configuration mode enter no access-list 10 command.

B. Under the global configuration mode enter no access-map vlan 10 command.

C. Under the global configuration mode enter no vlan access-map test1 10 command.

D. Under the global configuration mode enter no vlan filter test1 vlan-list 10 command.

Answer: C

Explanation:

On DSW1, VALN ACL, Need to delete the VLAN access-map test1 whose action is to drop access-list 10; specifically 10.2.1.3

Q5. - (Topic 12)

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

Answer: G

Explanation:

port security needs is configured on ASW1.

Far out tshoot 300-135 quick reference:

Q6. - (Topic 13)

Use the supported commands to isolated the cause of this fault and answer the following questions.

Which is the solution to the fault condition?

A. Under the EIGRP process, delete the redistribute ospf 1 route-map OSPF_ to_ EIGRP command and enter the redistribute ospf 1 route-map OSPF - > EIGRP command.

B. Under the EIGRP process, delete the redistribute ospf 1 route-map OSPF_ to_ EIGRP command and enter the redistribute ospf 6 metric route-map OSPF - > EIGRP command.

C. Under the OSPF process, delete the redistribute eigrp10 subnets route-map EIGPR ->OSPF command and enter the redistribute eigrp10 subnets route-map OSPF - > EIGRP command.

D. Under the OSPF process, delete the redistribute eigrp10 subnets route-map EIGPR ->OSPF command and enter the redistribute eigrp10 subnets route-map EIGPR - > OSPF command.

E. Under the EIGRP process, delete the redistribute ospf 1 route-map OSPF _to_ EIGRP command and enter redistribute ospf 1 metric 100000 100 100 1 15000 route_ map OSPF _to _EIGRP command

Answer: A

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.

Topic 14, Ticket 9 : EIGRP AS number

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

. From Client PC we can ping 10.2.1.254

. But IP 10.2.1.3 is not able to ping from R4, R3, R2, R1 .

. This clearly shows problem at R4 Kindly check routes in EIGRP there are no routes of eigrp.

. Check the neighborship of EIGRP on R4; there are no neighbor seen from DSW1 & DSW2 check the running config of EIGRP protocol it shows EIGRP AS 1 process…. Now check on DSW1 & DSW2

On DSW1 only one Eigrp neighbour is there with DSW2 but its not with R4…

. From above snapshot & since R4 has EIGRP AS number 1 due to which neighbour is not happening.

. Change required: On R4, IPV4 EIGRP Routing, need to change the EIGRP AS number from 1 to 10 since DSW1 & DSW2 is configured to be in EIGRP AS number 10.

Q7. - (Topic 12)

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: D

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.

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.

Q8. - (Topic 11)

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 Serial0/0/1 enter the ip access-group edge_security out command.

B. Under the ip access-list extended edge_security configuration add the permit ip

209.65.200.224 0.0.0.3 any command.

C. Under the ip access-list extended edge_security configuration delete the deny ip

10.0.0.0.0 0.255.255.255 any command.

D. Under the interface Serial0/0/0 configuration delete the ip access-group edge_security in command and enter the ip access-group edge_security out command.

Answer: B

Explanation:

On R1, we need to permit IP 209.65.200.222/30 under the access list.

Topic 12, Ticket 7 : Port Security

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.

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 getting 169.X.X.X

. On ASW1 port Fa1/0/ 1 & Fa1/0/2 access port VLAN 10 was assigned but when we checked interface it was showing down

Sh run ------- check for running config of int fa1/0/1 & fa1/0/2 (switchport access Vlan 10 will be there with switch port security command). Now check as below Sh int fa1/0/1 & sh int fa1/0/2

. As seen on interface the port is in err-disable mode so need to clear port.

. Change required: On ASW1, we need to remove port-security under interface fa1/0/1 & fa1/0/2.

Q9. - (Topic 2)

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: D

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.

Q10. - (Topic 21)

The implementation group has been using the test bed to do an IPv6 'proof-of-concept1.

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: C

Explanation:

This is due to mismatched tunnel modes between R3 and R4:

Problem is with R3, and to resolve the issue we should delete the "tunnel mode ipv6" under interface Tunnel 34.

2021 Dec cisco ccnp routing/switching 300-135 tshoot:

Far out tshoot 300-135 quick reference:

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