Cisco 300-135 ExamTSHOOT Troubleshooting and Maintaining Cisco IP Networks

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2017 Apr 300-135 test questions

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:

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 9) 

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: 

The BGP neighbor statement is wrong on R1. 


Q3. - (Topic 1)

Which statement is true about an IPsec/GRE tunnel?

A. The GRE tunnel source and destination addresses are specified within the IPsec transform set.

B. An IPsec/GRE tunnel must use IPsec tunnel mode.

C. GRE encapsulation occurs before the IPsec encryption process.

D. Crypto map ACL is not needed to match which traffic will be protected.

Answer: C

Topic 2, Troubleshooting VTP 

7. - (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. 

PC2 in VLAN 200 is unable to ping the gateway address 172.16.200.1; identify the issue. 

A. VTP domain name mismatch on SW4 

B. VLAN 200 not configured on SW1 

C. VLAN 200 not configured on SW2 

D. VLAN 200 not configured on SW4 

Answer:

Explanation: 

By looking at the configuration for SW2, we see that it is missing VLAN 200, and the "switchport access vlan 200" command is missing under interface eth 0/0: 

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Q4. - (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. 

You have configured PVST+ load balancing between SW1 and the New_Switch in such a way that both the links E2/2 and E2/3 are utilized for traffic flow, which component of the configuration is preventing PVST+ load balancing between SW1 and SW2 links 

A. Port priority configuration on SW1 

B. Port priority configuration on the New_Switch 

C. Path cost configuration on SW1 

D. Path cost configuration on the New_Switch 

Answer:

Explanation: 

Here is the configuration found on the New_Switch: 

This causes the port cost for link eth 1/3 to increase the path cost to 250 for all VLANs, making that link less preferred so that only eth 1/2 will be used. 

Topic 3, Troubleshooting EIGRP 

11. - (Topic 3) 

Scenario: 

You have been brought in to troubleshoot an EIGRP network. You have resolved the initial issue between routers R2 and R4, but another issue remains. You are to locate the problem and suggest solution to resolve the issue. 

The customer has disabled access to the show running-config command. 

The network segment between R2 and R4 has become disconnected from the remainder of the network. How should this issue be resolved? 

A. Change the autonomous system number in the remainder of the network to be consistent with R2 and R4. 

B. Move the 192.168.24.0 network to the EIGRP 1 routing process in R2 and R4. 

C. Enable the R2 and R4 router interfaces connected to the 192.168.24.0 network. 

D. Remove the distribute-list command from the EIGRP 200 routing process in R2. 

E. Remove the distribute-list command from the EIGRP 100 routing process in R2. 

Answer:

Explanation: 

When issuing the "show ip eigrp neighbor" command (which is about the only command that it lets you do in this question) you will see that all other routers are configured for EIGRP AS 1. However, the 192.16824.0 network between R2 and R4 is incorrectly configured for EIGRP AS 100: 


Q5. - (Topic 18) 

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 isolate the cause of this fault and answer the following question. 

What is the solution to the fault condition? 

A. Under the global configuration, delete the no ip dhcp use vrf connected command. 

B. Under the IP DHCP pool configuration, delete the default -router 10.2.1.254 command and enter the default-router 10.1.4.5 command. 

C. Under the IP DHCP pool configuration, delete the network 10.2.1.0 255.255.255.0 command and enter the network 10.1.4.0 255.255.255.0 command. 

D. Under the IP DHCP pool configuration, issue the no ip dhcp excluded-address 10.2.1.1 

10.2.1.253 command and enter the ip dhcp excluded-address 10.2.1.1 10.2.1.2 command. 

Answer:

Explanation: 

On R4 the DHCP IP address is not allowed for network 10.2.1.0/24 which clearly shows the problem lies on R4 & the problem is with DHCP 


Update 300-135 exam fees:

Q6. - (Topic 14) 

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, 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. 

Topic 15, Ticket 10 : VLAN Access Map 

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 1 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 

. Change required: 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 


Q7. - (Topic 18) 

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 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:

Explanation: 

On R4 the DHCP IP address is not allowed for network 10.2.1.0/24 which clearly shows the problem lies on R4 & the problem is with DHCP 


Q8. - (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. 


Q9. - (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).

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: G

Explanation:

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


Q10. - (Topic 7) 

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 

Answer:

Explanation: 

The problem here is that VLAN 10 is not configured on the proper interfaces on switch ASW1. 


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