Download Cisco.Selftestengine.200-125.2017-10-12.1e.43q.vcex

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Exam CCNA Cisco Certified Network Associate CCNA (v3.0)
Number 200-125
File Name Cisco.Selftestengine.200-125.2017-10-12.1e.43q.vcex
Size 1.46 Mb
Posted October 12, 2017
Downloaded 32



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Demo Questions

Question 1

In which two formats can the IPv6 address fd15:0db8:0000:0000:0700:0003:400F:572B be written? (Choose two.)

  • A: fd15:0db8:0000:0000:700:3:400F:527B
  • B: fd15::db8::700:3:400F:527B
  • C: fd15:db8:0::700:3:4F:527B
  • D: fd15:0db8::7:3:4F:527B
  • E: fd15:db8::700:3:400F:572B

Correct Answer: AE




Question 2

When an interface is configured with PortFast BPDU guard, how does the interface respond when it receives a BPDU?

  • A: It continues operating normally.
  • B: It goes into a down/down state.
  • C: It becomes the root bridge for the configured VLAN.
  • D: It goes into an errdisable state.

Correct Answer: D




Question 3

What are three characteristics of the TCP protocol? (Choose three.)

  • A: It uses a single SYN-ACK message to establish a connection.
  • B: The connection is established before data is transmitted.
  • C: It ensures that all data is transmitted and received by the remote device.
  • D: It supports significantly higher transmission speeds than UDP.
  • E: It requires applications to determine when data packets must be retransmitted.
  • F: It uses separate SYN and ACK messages to establish a connection.

Correct Answer: BCF




Question 4

Scenario 
Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. 
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. 
Use appropriate show commands to troubleshoot the issues and answer all four questions. 
Instructions 
 

   
 
    
An OSPF neighbor adjacency is not formed between R3 in the main office and R4 in the Branch1 office. What is causing the problem?

  • A: There is an area ID mismatch.
  • B: There is a Layer 2 issue; an encapsulation mismatch on serial links.
  • C: There is an OSPF hello and dead interval mismatch.
  • D: The R3 router ID is configured on R4.

Correct Answer: A

Here are the relevant parts of the router configs:
R1interface Loopback0description ***Loopback***ip address 192.168.1.1 255.255.255.255ip ospf 1 area 0!interface Ethernet0/0description **Connected to R1-LAN**ip address 10.10.110.1 255.255.255.0ip ospf 1 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.1 255.255.255.0ip ospf hello-interval 25ip ospf 1 area 0!router ospf 1log-adjacency-changes 
R2!interface Loopback0description **Loopback**ip address 192.168.2.2 255.255.255.255ip ospf 2 area 0!interface Ethernet0/0description **Connected to R2-LAN**ip address 10.10.120.1 255.255.255.0ip ospf 2 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.2 255.255.255.0ip ospf 2 area 0!router ospf 2log-adjacency-changes 
R3username R6 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.3.3 255.255.255.255ip ospf 3 area 0!interface Ethernet0/0description **Connected to L2SW**ip address 10.10.230.3 255.255.255.0ip ospf 3 area 0!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!interface Serial1/1description **Connected to R5-Branch2 office**ip address 10.10.240.5 255.255.255.252encapsulation pppip ospf hello-interval 50ip ospf 3 area 0!interface Serial1/2description **Connected to R6-Branch3 office**ip address 10.10.240.9 255.255.255.252encapsulation pppip ospf 3 area 0ppp authentication chap!router ospf 3router-id 192.168.3.3! 
R4!interface Loopback0description **Loopback**ip address 192.168.4.4 255.255.255.255ip ospf 4 area 2!interface Ethernet0/0ip address 172.16.113.1 255.255.255.0ip ospf 4 area 2!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2 255.255.255.252encapsulation pppip ospf 4 area 2!router ospf 4log-adjacency-changes 
R5!interface Loopback0description **Loopback**ip address 192.168.5.5 255.255.255.255ip ospf 5 area 0!interface Ethernet0/0ip address 172.16.114.1 255.255.255.0ip ospf 5 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.6 255.255.255.252encapsulation pppip ospf 5 area 0!router ospf 5log-adjacency-changes 
R6username R3 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.6.6 255.255.255.255ip ospf 6 area 0!interface Ethernet0/0ip address 172.16.115.1 255.255.255.0ip ospf 6 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.10 255.255.255.252encapsulation pppip ospf 6 area 0ppp authentication chap!router ospf 6router-id 192.168.3.3! 
On both R3 and R4 use “show running-config” command to check their S1/0 interfaces 
R3#show running-config<<output omitted>>!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!<<output omitted>> 
R4#show running-config<<output omitted>>!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2 255.255.255.252encapsulation pppip ospf 4 area 2!<<output omitted>> 
In the output above we see their Area IDs are mismatched; interface S1/0 of R3 is in area 0 (R3: ip ospf 3 area 0) while interface s1/0 of R4 is in area 2 (R4: ip ospf 4 area 2).




Question 5

Scenario 
Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. 
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. 
Use appropriate show commands to troubleshoot the issues and answer all four questions. 
Instructions 
 

 
 
    
An OSPF neighbor adjacency is not formed between R3 in the main office and R5 in the Branch2 office. What is causing the problem?

  • A: There is an area ID mismatch.
  • B: There is a PPP authentication issue; a password mismatch.
  • C: There is an OSPF hello and dead interval mismatch.
  • D: There is a missing network command in the OSPF process on R5.

Correct Answer: C

Here are the relevant parts of the router configs:
R1interface Loopback0description ***Loopback***ip address 192.168.1.1 255.255.255.255ip ospf 1 area 0!interface Ethernet0/0description **Connected to R1-LAN**ip address 10.10.110.1 255.255.255.0ip ospf 1 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.1 255.255.255.0ip ospf hello-interval 25ip ospf 1 area 0!router ospf 1log-adjacency-changes 
R2!interface Loopback0description **Loopback**ip address 192.168.2.2 255.255.255.255ip ospf 2 area 0!interface Ethernet0/0description **Connected to R2-LAN**ip address 10.10.120.1 255.255.255.0ip ospf 2 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.2 255.255.255.0ip ospf 2 area 0!router ospf 2log-adjacency-changes 
R3username R6 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.3.3 255.255.255.255ip ospf 3 area 0!interface Ethernet0/0description **Connected to L2SW**ip address 10.10.230.3 255.255.255.0ip ospf 3 area 0!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!interface Serial1/1description **Connected to R5-Branch2 office**ip address 10.10.240.5 255.255.255.252encapsulation pppip ospf hello-interval 50ip ospf 3 area 0!interface Serial1/2description **Connected to R6-Branch3 office**ip address 10.10.240.9 255.255.255.252encapsulation pppip ospf 3 area 0ppp authentication chap!router ospf 3router-id 192.168.3.3! 
R4!interface Loopback0description **Loopback**ip address 192.168.4.4 255.255.255.255ip ospf 4 area 2!interface Ethernet0/0ip address 172.16.113.1 255.255.255.0ip ospf 4 area 2!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2 255.255.255.252encapsulation pppip ospf 4 area 2!router ospf 4log-adjacency-changes 
R5!interface Loopback0description **Loopback**ip address 192.168.5.5 255.255.255.255ip ospf 5 area 0!interface Ethernet0/0ip address 172.16.114.1 255.255.255.0ip ospf 5 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.6 255.255.255.252encapsulation pppip ospf 5 area 0!router ospf 5log-adjacency-changes 
R6username R3 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.6.6 255.255.255.255ip ospf 6 area 0!interface Ethernet0/0ip address 172.16.115.1 255.255.255.0ip ospf 6 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.10 255.255.255.252encapsulation pppip ospf 6 area 0ppp authentication chap!router ospf 6router-id 192.168.3.3! 
Continue checking their connected interfaces with the “show running-config” command:
R3#show running-config<<output omitted>>!interface Serial1/1description **Connected to R5-Branch2 office**ip address 10.10.240.5 255.255.255.252encapsulation pppip ospf hello-interval 50ip ospf 3 area 0!<<output omitted>> 
R5#show running-config<<output omitted>>!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.6 255.255.255.252encapsulation pppip ospf 5 area 0!<<output omitted>> 
The only difference we can see here is the line “ip ospf hello-interval 50″ on R3. This command sets the number of seconds R3 waits before sending the next hello packet out this interface. In this case after configuring this command, R3 will send hello packets to R5 every 50 seconds. But the default value of hello-interval is 10 seconds and R5 is using it. Therefore we can think of a hello interval mismatch problem here. You can verify with the “show ip ospf interface <interface>” command on each router. 
R3#sh ip ospf int s1/1Serial1/1 is up, line protocol is upInternet Address 10.10.240.5/30, Area 0Process ID 3, Router ID 192.168.3.3, Network Type POINT_TO_POINT, Cost: 64Enabled by interface config, including secondary ip addressesTransmit Delay is 1 sec, State POINT_TO_POINT,Timer intervals configured, Hello 50, Dead 200, Wait 200, Retransmit 5oob-resync timeout 200Hello due in 00:00:28Supports Link-local Signaling (LLS)Index 2/2, flood queue length 0Next 0×0(0)/0×0(0)Last flood scan length is 0, maximum is 0Last flood scan time is 0 msec, maximum is 0 msecNeighbor Count is 0, Adjacent neighbor count is 0Suppress hello for 0 neighbor(s)
R5#sh ip ospf int s1/0Serial1/0 is up, line protocol is upInternet Address 10.10.240.6/30, Area 0Process ID 5, Router ID 10.10.240.6, Network Type POINT_TO_POINT, Cost: 64Enabled by interface config, including secondary ip addressesTransmit Delay is 1 sec, State POINT_TO_POINT,Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5oob-resync timeout 40Hello due in 00:00:04Supports Link-local Signaling (LLS)Index 1/1, flood queue length 0Next 0×0(0)/0×0(0)Last flood scan length is 0, maximum is 0Last flood scan time is 0 msec, maximum is 0 msecNeighbor Count is 0, Adjacent neighbor count is 0Suppress hello for 0 neighbor(s)
So we can see both hello and dead interval are mismatched because the dead interval always four times the value of hello interval, unless you manually configure the dead interval (with the ip ospf dead-interval <seconds> command).




Question 6

Scenario 
Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. 
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. 
Use appropriate show commands to troubleshoot the issues and answer all four questions. 
Instructions 
 

 
 
    
R1 does not form an OSPF neighbor adjacency with R2. Which option would fix the issue?

  • A: R1 ethernet0/1 is shutdown. Configure no shutdown command.
  • B: R1 ethernet0/1 configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25
  • C: R2 ethernet0/1 and R3 ethernet0/0 are configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25
  • D: Enable OSPF for R1 ethernet0/1; configure ip ospf 1 area 0 command under ethernet0/1.

Correct Answer: B

Here are the relevant parts of the router configs:
R1interface Loopback0description ***Loopback***ip address 192.168.1.1 255.255.255.255ip ospf 1 area 0!interface Ethernet0/0description **Connected to R1-LAN**ip address 10.10.110.1 255.255.255.0ip ospf 1 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.1 255.255.255.0ip ospf hello-interval 25ip ospf 1 area 0!router ospf 1log-adjacency-changes 
R2!interface Loopback0description **Loopback**ip address 192.168.2.2 255.255.255.255ip ospf 2 area 0!interface Ethernet0/0description **Connected to R2-LAN**ip address 10.10.120.1 255.255.255.0ip ospf 2 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.2 255.255.255.0ip ospf 2 area 0!router ospf 2log-adjacency-changes 
R3username R6 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.3.3 255.255.255.255ip ospf 3 area 0!interface Ethernet0/0description **Connected to L2SW**ip address 10.10.230.3 255.255.255.0ip ospf 3 area 0!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!interface Serial1/1description **Connected to R5-Branch2 office**ip address 10.10.240.5 255.255.255.252encapsulation pppip ospf hello-interval 50ip ospf 3 area 0!interface Serial1/2description **Connected to R6-Branch3 office**ip address 10.10.240.9 255.255.255.252encapsulation pppip ospf 3 area 0ppp authentication chap!router ospf 3router-id 192.168.3.3! 
R4!interface Loopback0description **Loopback**ip address 192.168.4.4 255.255.255.255ip ospf 4 area 2!interface Ethernet0/0ip address 172.16.113.1 255.255.255.0ip ospf 4 area 2!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2 255.255.255.252encapsulation pppip ospf 4 area 2!router ospf 4log-adjacency-changes 
R5!interface Loopback0description **Loopback**ip address 192.168.5.5 255.255.255.255ip ospf 5 area 0!interface Ethernet0/0ip address 172.16.114.1 255.255.255.0ip ospf 5 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.6 255.255.255.252encapsulation pppip ospf 5 area 0!router ospf 5log-adjacency-changes 
R6username R3 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.6.6 255.255.255.255ip ospf 6 area 0!interface Ethernet0/0ip address 172.16.115.1 255.255.255.0ip ospf 6 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.10 255.255.255.252encapsulation pppip ospf 6 area 0ppp authentication chap!router ospf 6router-id 192.168.3.3! 
Continue checking their connected interfaces with the “show running-config” command:
R1#show running-config<<output omitted>>!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.1 255.255.255.0ip ospf hello-interval 25ip ospf 1 area 0!<<output omitted>> 
R2#show running-config<<output omitted>>!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.2 255.255.255.0ip ospf 2 area 0!<<output omitted>> 
We see the hello interval on R1 is not the same as R2 (and you can verify with the “show ip ospf interface <interface> command”) -> There is a hello and dead interval mismatch problem. We should configure “no ip ospf hello-interval 25″ on R1. 
Note: Maybe there are some versions of this question in the exam. For example there are some reports saying that Ethernet0/1 on R1 is shutdown (and this is the correct choice in the exam). So please be careful checking the config on the routers before choosing the correct answers.




Question 7

Scenario 
Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. 
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. 
Use appropriate show commands to troubleshoot the issues and answer all four questions. 
Instructions 
 

 
 
 
An OSPF neighbor adjacency is not formed between R3 in the main office and R6 in the Branch3 office. What is causing the problem?

  • A: There is an area ID mismatch.
  • B: There is a PPP authentication issue; the username is not configured on R3 and R6.
  • C: There is an OSPF hello and dead interval mismatch.
  • D: The R3 router ID is configured on R6.

Correct Answer: D

Here are the relevant parts of the router configs: 
R1interface Loopback0description ***Loopback***ip address 192.168.1.1 255.255.255.255ip ospf 1 area 0!interface Ethernet0/0description **Connected to R1-LAN**ip address 10.10.110.1 255.255.255.0ip ospf 1 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.1 255.255.255.0ip ospf hello-interval 25ip ospf 1 area 0!router ospf 1log-adjacency-changes 
R2!interface Loopback0description **Loopback**ip address 192.168.2.2 255.255.255.255ip ospf 2 area 0!interface Ethernet0/0description **Connected to R2-LAN**ip address 10.10.120.1 255.255.255.0ip ospf 2 area 0!interface Ethernet0/1description **Connected to L2SW**ip address 10.10.230.2 255.255.255.0ip ospf 2 area 0!router ospf 2log-adjacency-changes 
R3username R6 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.3.3 255.255.255.255ip ospf 3 area 0!interface Ethernet0/0description **Connected to L2SW**ip address 10.10.230.3 255.255.255.0ip ospf 3 area 0!interface Serial1/0description **Connected to R4-Branch1 office**ip address 10.10.240.1 255.255.255.252encapsulation pppip ospf 3 area 0!interface Serial1/1description **Connected to R5-Branch2 office**ip address 10.10.240.5 255.255.255.252encapsulation pppip ospf hello-interval 50ip ospf 3 area 0!interface Serial1/2description **Connected to R6-Branch3 office**ip address 10.10.240.9 255.255.255.252encapsulation pppip ospf 3 area 0ppp authentication chap!router ospf 3router-id 192.168.3.3! 
R4!interface Loopback0description **Loopback**ip address 192.168.4.4 255.255.255.255ip ospf 4 area 2!interface Ethernet0/0ip address 172.16.113.1 255.255.255.0ip ospf 4 area 2!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.2 255.255.255.252encapsulation pppip ospf 4 area 2!router ospf 4log-adjacency-changes 
R5!interface Loopback0description **Loopback**ip address 192.168.5.5 255.255.255.255ip ospf 5 area 0!interface Ethernet0/0ip address 172.16.114.1 255.255.255.0ip ospf 5 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.6 255.255.255.252encapsulation pppip ospf 5 area 0!router ospf 5log-adjacency-changes 
R6username R3 password CISCO36!interface Loopback0description **Loopback**ip address 192.168.6.6 255.255.255.255ip ospf 6 area 0!interface Ethernet0/0ip address 172.16.115.1 255.255.255.0ip ospf 6 area 0!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.10 255.255.255.252encapsulation pppip ospf 6 area 0ppp authentication chap!router ospf 6router-id 192.168.3.3! 
R3#show running-config<<output omitted>>username R6 password CISCO36!interface Serial1/2description **Connected to R6-Branch3 office**ip address 10.10.240.9 255.255.255.252encapsulation pppip ospf 3 area 0ppp authentication chap!<<output omitted>>!router ospf 3router-id 192.168.3.3!<<output omitted>> 
R6#show running-config<<output omitted>>username R3 password CISCO36!interface Serial1/0description **Connected to R3-Main Branch office**ip address 10.10.240.10 255.255.255.252encapsulation pppip ospf 6 area 0ppp authentication chap!<<output omitted>>!router ospf 6router-id 192.168.3.3!<<output omitted>> 
We are not sure about the configuration of ppp authentication in this case. Some reports said that only one router has the “ppp authentication chap” command but it is just a trick and is not the problem here. The real problem here is R6 uses the same router-id of R3 (192.168.3.3) so OSPF neighborship cannot be established. In real life, such configuration error will be shown in the command line interface (CLI). So please check carefully for this question.




Question 8

What are three advantages of VLANs? (Choose three.)

  • A: They establish broadcast domains in switched networks.
  • B: They provide a low-latency internetworking alternative to routed networks.
  • C: They utilize packet filtering to enhance network security.
  • D: They can simplify adding, moving, or changing hosts on the network.
  • E: They allow access to network services based on department, not physical location.
  • F: They provide a method of conserving IP addresses in large networks.

Correct Answer: ADE




Question 9

Which command can you enter to determine whether serial interface 0/2/0 has been configured using HDLC encapsulation?

  • A: router#show platform
  • B: router#show interfaces Serial 0/2/0
  • C: router#show ip interface s0/2/0
  • D: router#show ip interface brief

Correct Answer: B




Question 10

Which function of the IP SLAs ICMP jitter operation can you use to determine whether a VoIP issue is caused by excessive end-to-end time?

  • A: packet loss
  • B: jitter
  • C: successive packet loss
  • D: round-trip time latency

Correct Answer: D










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