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Cisco 200-105 問題練習

Interconnecting Cisco Networking Devices Part 2 (ICND2 v3.0) 試験

最新更新時間: 2019/07/06,合計195問。

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Question No : 1
Scenario
Refer to the topology. Your company has connected the routers R1. R2. and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.
The EIGRP routing protocol is configured.
You are required to troubleshoot and resolve the EIGRP issues between the various routers.
Use the appropriate show commands to troubleshoot the issues.



























Study the following output taken on R1:
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
Why are the pings failing?

正解:
Explanation:
R5 does not have a route to the 10.1.1.1 network, which is the loopback0 IP address of R1. When looking at the EIGRP configuration on R1, we see that the 10.1.1.1 network statement is missing on R1.


Question No : 2
Scenario
Refer to the topology. Your company has connected the routers R1. R2. and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.
The EIGRP routing protocol is configured.
You are required to troubleshoot and resolve the EIGRP issues between the various routers.
Use the appropriate show commands to troubleshoot the issues.



























Router R6 does not form an EIGRP neighbor relationship correctly with router R1.
What is the cause for this misconfiguration?

正解:
Explanation:
The link from R1 to R6 is shown below:



As you can see, they are both using e0/0.
The IP addresses are in the 192.168.16.0 network:



But when we look at the EIGRP configuration, the “network 192.168.16.0” command is missing on R6.



Study the following output taken on R1:
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)

Question No : 3
Scenario
Refer to the topology. Your company has connected the routers R1. R2. and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.
The EIGRP routing protocol is configured.
You are required to troubleshoot and resolve the EIGRP issues between the various routers.
Use the appropriate show commands to troubleshoot the issues.



























Which path does traffic take from R1 to R5?

正解:
Explanation:
Using the “show ip int brief command” on R5 we can see the IP addresses assigned to this router. Then, using the “show ip route” command on R1 we can see that to reach 10.5.5.5 and 10.5.5.55 the preferred path is via Serial 1/3, which we see from the diagram is the link to R2.


Question No : 4
Scenario
Refer to the topology. Your company has connected the routers R1. R2. and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.
The EIGRP routing protocol is configured.
You are required to troubleshoot and resolve the EIGRP issues between the various routers.
Use the appropriate show commands to troubleshoot the issues.



























The loopback interfaces on R4 with the IP addresses of 10.4.4.4 /32, 10.4.4.5/32. and 10.4.4.6/32 are not appearing in the routing table of R5
Why are the interfaces missing?

正解:
Explanation:
For an EIGRP neighbor to form, the following must match:
- Neighbors must be in the same subnet - K values - AS numbers - Authentication method and key strings
Here, we see that R4 is configured for EIGRP AS 2, when it should be AS 1.


Question No : 5
A static map to the S-AMER location is required.









Which command should be used to create this map?

正解:
Explanation:
Frame-relay map ip 172.30.0.3 230 broadcast

Question No : 6
Which connection uses the default encapsulation for serial interfaces on Cisco routers?









正解:
Explanation:
Cisco default encapsulation is HDLC which is by default enabled on all cisco router. If we want to enable other encapsulation protocol (PPP, X.25 etc) we need to define in interface setting. But here except s1/1 all interface defined by other encapsulation protocol so we will assume default encapsulation running on s1/1 interface and s1/1 interface connected with North

Question No : 7
What would be the destination Layer 2 address in the frame header for a frame that is being forwarded by Dubai to the host address of 172.30.4.4?









正解:
Explanation:
According to command output 172.30.4.4 is using the 694 dlci value.
http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp1029343

Question No : 8
If required, what password should be configured on the DeepSouth router in the branch office to allow a connection to be established with the MidEast router?









正解:
Explanation:
In the diagram, DeepSouth is connected to Dubai’s S1/2 interface and is configured as follows:
Interface Serial1/2
IP address 192.168.0.5 255.255.255.252
Encapsulalation PPP; Encapsulation for this interface is PPP
Check out the following Cisco Link:
http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a0080094333.shtml#configu ringa usernamedifferentfromtheroutersname
Here is a snipit of an example:
Network Diagram
If Router 1 initiates a call to Router 2, Router 2 would challenge Router 1, but Router 1 would not challenge Router 2. This occurs because the ppp authentication chap callin command is configured on Router 1. This is an example of a unidirectional authentication.
In this setup, the ppp chap hostname alias-r1 command is configured on Router 1. Router 1 uses "alias-r1" as its hostname for CHAP authentication instead of "r1." The Router 2 dialer map name should match Router 1's ppp chap hostname; otherwise, two B channels are established, one for each direction.


Question No : 9
R1 is configured with the default configuration of OSPF.






From the following list of IP addresses configured on R1, which address will the OSPF process select as the router ID?

正解:
Explanation:
The Router ID (RID) is an IP address used to identify the router and is chosen using the following sequence:
+ The highest IP address assigned to a loopback (logical) interface.
+ If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.
+ The router ID can be manually assigned
In this case, because a loopback interface is not configured so the highest active IP address 192.168.0.1 is chosen as the router ID.

Question No : 10
To allow or prevent load balancing to network 172.16.3.0/24, which of the following commands could be used in R2? (Choose two.)






正解:
Explanation:
OSPF Cost
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml#t6
Explanation:
The cost (also called metric) of an interface in OSPF is an indication of the overhead required to send packets across a certain interface. The cost of an interface is inversely proportional to the bandwidth of that interface. A higher bandwidth indicates a lower cost. There is more overhead (higher cost) and time delays involved in crossing a 56k serial line than crossing a 10M ethernet line.
The formula used to calculate the cost is:
cost= 10000 0000/bandwith in bps
For example, it will cost 10 EXP8/10 EXP7 = 10 to cross a 10M Ethernet line and will cost 10 EXP8/1544000 =64 to cross a T1 line.
By default, the cost of an interface is calculated based on the bandwidth; you can force the cost of an interface with the ip ospf cost <value> interface subconfiguration mode command.

Question No : 11
After the network has converged, what type of messaging, if any, occurs between R3 and R4?






正解:
Explanation:
HELLO messages are used to maintain adjacent neighbors so even when the network is converged, hellos are still exchanged. On broadcast and point-to-point links, the default is 10 seconds, on NBMA the default is 30 seconds.

Question No : 12
OSPF is configured using default classful addressing.






With all routers and interfaces operational, how many networks will be in the routing table of R1 that are indicated to be learned by OSPF?

正解:
Explanation:
It already knows about its directly connected ones, only those not directly connected are “Learned by OSPF”.
OSPF as a link state routing protocol (deals with LSAs rather than routes) does not auto summarize (doesn't support "auto-summary").So learned route by OSPF are followed

Question No : 13
Refer to the exhibit.



Hosts in network 192.168.2.0 are unable to reach hosts in network 192.168.3.0.
Based on the output from RouterA, what are two possible reasons for the failure? (Choose two.)
A. The cable that is connected to S0/0 on RouterA is faulty.
B. Interface S0/0 on RouterB is administratively down.
C. Interface S0/0 on RouterA is configured with an incorrect subnet mask.
D. The IP address that is configured on S0/0 of RouterB is not in the correct subnet.
E. Interface S0/0 on RouterA is not receiving a clock signal from the CSU/DSU.
F. The encapsulation that is configured on S0/0 of RouterB does not match the encapsulation that is configured on S0/0 of RouterA.

正解: E, F
Explanation: http://www.cisco.com/en/US/docs/routers/access/800/819/software/configuration/Guide/6ser_conf.html

Question No : 14
Topic 6, Infrastructure Maintenance

Refer to the exhibit.



Assuming that the entire network topology is shown, what is the operational status of the interfaces of R2 as indicated by the command output shown?

正解:
Explanation:
R2 has setup with two interface s0/1 and fa0/0 and both are interfaces configured with IP address and up. "show ip interface brief" showing the status of R2 interfaces.

Question No : 15
What are three reasons to collect Netflow data on a company network? (Choose three.)

正解:
Explanation:
NetFlow facilitates solutions to many common problems encountered by IT professionals.
+ Analyze new applications and their network impact
Identify new application network loads such as VoIP or remote site additions.
+ Reduction in peak WAN traffic
Use NetFlow statistics to measure WAN traffic improvement from application-policy changes; understand who is utilizing the network and the network top talkers.
+ Troubleshooting and understanding network pain points
Diagnose slow network performance, bandwidth hogs and bandwidth utilization quickly with command line interface or reporting tools. -> D is correct.
+ Detection of unauthorized WAN traffic
Avoid costly upgrades by identifying the applications causing congestion. -> A is correct.
+ Security and anomaly detection
NetFlow can be used for anomaly detection and worm diagnosis along with applications such as Cisco CS-Mars.
+ Validation of QoS parameters
Confirm that appropriate bandwidth has been allocated to each Class of Service (CoS) and that no CoS is over- or under-subscribed.-> F is correct.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-netflow/prod_white_paper0900aecd80406232.html

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