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Cisco 200-125 問題練習

CCNA Cisco Certified Network Associate CCNA (v3.0) 試験

最新更新時間: 2019/07/07,合計4230問。

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Question No : 1
You are verifying the EIGRP configurations in the topology
statement is true?

正解:
Explanation:
In this question we should check the local routers to see if these subnets have been advertised or not as there are many issues in the path which prevent these subnets from being shown in the routing tables.
When checking Branch1 router, we notice “network 172.16.0.0” is missing under EIGRP 200 so answer D is correct.


Question No : 2
The GRE tunnel between r3 and Branch 1 is down.
Which cause of the issue is true?
A The tunnel source loopback0 interface is not advertised into EIGRP in Branch1.
B The tunnel source loopback0 interface is not advertised into EIGRP in R3
C The EIGRP neighbor relationship was not formed due to EIGRP packets blocked by inbound ACL on R3
D The EIGRP neighbor relationship was no formed due the IP address being misconfigured between the R2 and R3 interfaces

正解: C
Explanation:
This issue is same as Question 2 but this time it is R3 which causes the issue. We can check R3 with the “show running-config” command.


Question No : 3
The traffic from Branch to the main office is using the secondary path instead of the primary path connected to R2
Which cause of the issue is true?

正解:
Explanation:
This issue is same as Question 2 but this time it is R3 which causes the issue. We can check R3 with the “show running-config” command.


Question No : 4
The traffic from Branch to the main office is using the secondary path instead of the primary path connected to R2.
Which cause of the issue is true?

正解:
Explanation:
Check Branch2 router with the “show running-config” command and we can see an access-list is blocking EIGRP packets advertised to Branch2.

Question No : 5
EIGRP GRE
You are implementing EIGRP between the main office and branch offices. In Phase 1, you must implement and verify EIGRP configurations as mentioned in the topology. In Phase 2, your colleague is expected to do NAT and ISP configurations.
Identify the issues that you are encountering during Phase 1 EIGRP implementation.
- Router R1 connects the main office to the Internet and router R2 and R3 are internal routers
- Routers Branch1 and Branch2 connect to router R2 in the main office.
- Users from the Branch1 LAN network 10 20.400/24 are expected to perform testing of the application that is hosted on the servers in Server farm1, before servers are available for production.
- The GRE tunnel is configured between R3 and Branch1, and traffic between server farm1 and Branch1 LAN network 10.20.40.0/24 is routed through the GRE tunnel using static routes
- The line between Branch1 and Branch2 is used as a secondary path in the event of failure of the primary path to main office
You have console access on R1, R2 R3 Branch1, and Branch2 devices use only show commands to troubleshoot the issues.




Examine the R1 routing table. None of the internal routes other than locally connected appear in the routing table.
Which cause of the issue is true?

正解:
Explanation:
R1 routing table does not have any EIGRP learned routes so R1 or the link between
R1 & R2 is the most likely problem. We should check if the IP addresses on R1 and
R2 are correct or not with the “show ip interface brief” command.
Use the show ip interface brief command to view the IP address of the E0/1 port of R1 is 192.168.14.250, the IP address of the E0/0 port of the peer R2 is 192.168.14.2, Two IP addresses are in 32 mask, which does not belong to a network segment, so the IP address is incorrectly configured.

Question No : 6
What would be the effect of issuing the command ip access-group 115 in on the s0/0/1 interface?

正解:

Question No : 7
What would be the effect of issuing the command ip access-group 114 in to the fa0/0 interface?

正解:

Question No : 8
ACL-1
An administrator is trying to ping and telnet from Switch to Router with the results
shown below:
Switch>
Switch> ping 10.4.4.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.4.4.3, timeout is 2 seconds:
.U.U.U
Success rate is 0 percent (0/5)
Switch>
Switch> telnet 10.4.4.3
Trying 10.4.4.3 …
% Destination unreachable; gateway or host down
Switch>
Click the console connected to Router and issue the appropriate commands to answer
the questions.



Note: The PTK file corresponding to this question is not supported by some command simulators, so the configuration is different from the dumps. ACL entries in PKT is not enough, the router configuration is subject to the PDF dumps.
Router>enable (requires to enter the password: cisco)
Router#show running-config
(The command display is incomplete, press the space bar a few times)










Which will fix the issue and allow ONLY ping to work while keeping telnet disabled?

正解:

Question No : 9
VLAN



Your colleague has built a Layer 2 network in your client locations. You must verify the configuration and fix any issues identified as per customer requirements.
Customer requirements:
+ Verify if switch ports are assigned correct VLANs as shown in topology. Identify and fix any misconfiguration found in three switches
+ Verify if trunk links are operational between switches and the IEEE 802.1Q trunk encapsulation method is used. Identify and fix any misconfiguration found in trunk configuration
+ You must make sure ports connected between switches are set as trunk ports

正解:




Question No : 10
Why did Branch1 router lose WAN connectivity with R1 router?

正解:
Explanation:
This question clearly stated there is a WAN connectivity issue between R1 and Branch1 so we should check both of them with the “show ip interface brief” command.
On R1:



On Branch1:



We can see that although the Multilink1 interfaces are in “up/up” state but they are not in the same subnet. According to the IP address scheme shown on the topology we can deduce the Multilink interface on Branch1 has been misconfigured, it should be 192.168.14.2 instead.

Question No : 11
Which statement about the router configurations is correct?

正解:
Explanation:
In this question we have to check each option to see if it is correct. When we check B ranch3 router we notice that “network 192.168.10.0” command is missing under “router eigrp 100” -> Answer D is correct.


Question No : 12
Why has the Branch3 router lost connectivity with R1? Use only show commands to troubleshoot because usage of the debug command is restricted on the Branch3 and R1 routers.

正解:
Explanation:
First we should check Branch3 (and R1) with the “show ip interface brief” command to find any Layer1/Layer 2 issue.



We see the interfaces connecting between them are in “up/down” states which indicates an Layer 2 issue so we should check the configuration of these interfaces carefully with the “show running-config” command and pay attention to these interfaces.



and on Branch3:



We learn from above config is R1 is using CHAP to authenticate Branch3 router (via the “ppp authentication chap” command on R1). Branch3 router is sending CHAP hostname “Branch_3” and CHAP password “Branch3_Secret!” to R1 to be authenticated. Therefore we should check if R1 has already been configured with such username and password or not with the “show running-config” command on R1:
On R1 we see the configured username is “Branch3”, not “Branch_3” so the usernames here are mismatched and this is the problem -> Answer A is correct.



On R1 we see the configured username is “Branch3”, not “Branch_3” so the usernames here are mismatched and this is the problem -> Answer A is correct.

Question No : 13
GRE Tunnel
Refer to the topology below and answer the following questions.




Why is the Branch2 network 10.1 0.20.0/24 unable to communicate with the Server farm1 network 10.10.10.0/24 over the GRE tunnel?

正解:
Explanation:
The Branch2 network is communicating to the Server farm, which is connected to R2, via GRE Tunnel so we should check the GRE tunnel first to see if it is in “up/up” state with the “show ip interface brief” command on the two routers.
On Branch2:



On R2:



We see interfaces Tunnel0 at two ends are “up/up” which are good so we should check for the routing part on two routers with the “show running-config” command and pay attention to the static routing of each router.
On Branch2 we see:



The destination IP address for this static route is not correct. It should be 192.168.24.1 (Tunnel0’s IP address of R2), not 192.168.24.10 -> Answer C is correct.
Note: You can use the “show ip route” command to check the routing configuration on each router but if the destination is not reachable (for example: we configure “ip route 10.10.10.0 255.255.255.0 192.168.24.10” on Branch2, but if 192.168.24.10 is unkn own then Branch2 router will not display this routing entry in its routing table.
Note: The IP address or configuration may be different in the exam.

Question No : 14
OSPFV3
You work as a network engineer for SASCOM Network Ltd Company. On router HQ, a provider link has been enabled and you must configure an IPV6 default route on HQ and make sure that this route is advertised in IPV6 OSPF process. Also, you must troubleshoot another issue. The router HQ is not forming an IPV6 OSPF neighbor relationship with router BR.

Topology Details
Two routers HQ and BR are connected via serial links.
Router HQ has interface Ethernet 0/1 connected to the provider cloud and interface Ethernet 0/0 connected to RA1.
Router BR has interface Ethernet 0/0 connected to another router RA2.

IPV6 Routing Details
All router are running IPV6 OSPF routing with process ID number 100. Refer to the topology diagram for information about the OSPF areas. The Loopback 0 IPv4 address is the OSPF router ID on each router.

Configuration requirements
- Configure IPV6 default route on router HQ with default gateway as 2001:DB8:B:B1B2::1.
- Verify by pinging provider test IPV6 address 2001:DB8:0:1111::1 after configuring default router on HQ.
- Make sure that the default route is advertised in IPV6 OSPF on router HQ. This default route should be advertised only when HQ has a default route in its routing table.
- Router HQ is not forming IPv6 OSPF neighbor with BR. You must troubleshoot and resolve this issue.

Special Note: To gain the maximum number of points. You must complete the necessary configurations and fix IPV6 neighbor issue with router BR. IPV6 OSPFV3 must be configured without using address families. Do not change the IPv6 OSPF Process ID.



正解:

Question No : 15
R1#ping 10.5.5.55 source 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.5.5.55, timeout is 2 seconds:
Packet sent with a source address of 10.1.1.1
.....
Success rate is 0 percent (0/5)

正解:

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