Tag - Cisco Certified Network Associate

200-125 Cisco Certified Network Associate (CCNA)

Cisco CCNA 200-125 Latest & Updated Exam Questions for candidates to study and pass exams fast. Cisco CCNA 200-125 exam dumps are frequently updated and reviewed for passing the exams quickly and hassle free!
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Number: 200-125
Passing Score: 800
Time Limit: 120 min

Name: CCNA Cisco Certified Network Associate

QUESTION 1
You are the network administrator for your company and have configured Cisco Discovery Protocol (CDP) in your network. You recently noticed that
when devices send large numbers of CDP neighbor announcements, some devices are crashing. You decide to disable CDP on the router.
Which command should you use to achieve the objective?

A. no cdp run
B. set cdp disable
C. no cdp enable
D. no cdp advertise-v2

Correct Answer: A

Explanation/Reference:
Explanation:
You should use the no cdp run command to disable CDP on the router. Due to a known vulnerability regarding the handling of CDP by Cisco routers and switches when devices send large numbers of CDP neighbor announcements, some devices can crash or cause abnormal system behavior. To overcome this problem, you can disable CDP for the entire router by using the no cdp run command.
You cannot use the set cdp disable command to disable CDP on the router. This command disables CDP on an entire Catalyst switch.
You cannot use the no cdp enable command to disable CDP on the router. This command disables CDP on a specific interface.
You cannot use the no cdp advertise-v2 command to disable CDP on the router. This command disables CDPv2 advertisements.

Objective:
LAN Switching Fundamentals
Sub-Objective:
Configure and verify Layer 2 protocols

References:
Cisco > Support > Using Cisco Discovery Protocol
Cisco > Support > Technology Support > Network Management > Cisco’s Response to the CDP Issue > Document ID: 13621

QUESTION 2
Which of the following protocols allow the root switch location to be optimized per VLAN? (Choose all that apply.)
A. PVST+
B. RSTP
C. PVRST
D. STP

Correct Answer: AC

Explanation/Reference:
Explanation:
Both Per VLAN Spanning Tree Plus (PVST+) and Per VLAN Rapid Spanning Tree (PVRST) protocols allow for a spanning tree instance for each VLAN, allowing for the location optimization of the root bridge for each VLAN. These are Cisco proprietary enhancements to the 802.1d and 802.1w standards, respectively.

Rapid Spanning Tree Protocol (RSTP) is another name for the 802.1w standard. It supports only one instance of spanning tree.
Spanning Tree Protocol (STP) is another name for the 802.1d standard. It supports only one instance of spanning tree.

Objective:
LAN Switching Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot STP protocols

References:
Cisco Home > Support > Technology Support > LAN Switching

QUESTION 3
Your assistant just finished configuring a small test network as part of his training. The network is configured as shown in the diagram below:

 

When testing the configuration, you find that Host A in the diagram cannot ping Host B.
Which of the following pairs of connections are required to be in the same subnet for Host A to be able to ping Host B? (Choose all that apply.)

A. The IP address of Host A and the IP address of the Fa0/0 interface of Router A
B. The IP address of the Fa0/0 interface of Router A and the IP address of the Fa0/0 interface of Router B
C. The IP address of Host A and the IP address of the Fa0/0 interface of Router B
D. The IP address of Host A and the IP address of Switch A
E. The IP address of the S 0/0 interface of Router A and the IP address of the S 0/0 interface of Router B
F. The IP address of Host A and the IP address of Host B
G. The IP address of Host B and the IP address of the Fa0/0 interface of Router B

Correct Answer: AEG

Explanation/Reference:
Explanation:

The following pairs of connections are required to be in the same subnet:

  • the IP address of Host A and the IP address of the Fa0/0 interface of Router A
  • the IP address of the S 0/0 interface of Router A and the IP address of the S 0/0 interface of Router B
  • the IP address of Host B and the IP address of the Fa0/0 interface of Router B

When troubleshooting a correctly labeled network diagram for IP addressing problems, one must start on one end and trace each link in one direction, ensuring at each step that the interfaces are in the same subnet. A switch simply passes the packet to the router; therefore, the IP address of the switch is not important. It performs its job even if it has no IP address

Moving from Host A to Host B, however, the following links must be in the same subnet:

  • The IP address of Host A and the IP address of the Fa0/0 interface of Router A
  • The IP address of the S0/0 interface of Router A and the IP address of the S0/0 interface of Router B
  • The IP address of Host B and the IP address of the Fa0/0 interface of Router B

Neither of the switch addresses is important to the process.

If all other routing issues are correct, it is also not required for Host A and Host B to be in the same subnet.

QUESTION 4
DRAG DROP
Click and drag the components on the left to their corresponding layers of the Open Systems Interconnection (OSI) model on the right.

Select and Place:

Correct Answer:

Page Number:
1 | 2
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Code: 200-125
Name: CCNA Cisco Certified Network Associate
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IP Troubleshooting

CCNA – Cisco Certified Network Associate

IP Troubleshooting (For Ping Command).

  First of all check the NIC that is it is working properly or not.
  Check the Cable connectivity.
  Check the IP of both the system, both system IP must be same
  Check the Firewall, Firewall must be off
  Check the time zone for both the system, it must be same
  Check that the system which we want to accessing, it must have a user password
  If it is not accessing yet now, restart the system
ip-troubleshooting
 
Console Port:
Console port is used to access the IOS of a switch. Rollover cable is used to access the IOS of switch from console port. One end of the cable is plugged in console port and second end cable is plugged un DB-9 connector, which is connected in COM-1 or COM-II port of the mother board in computer. Default band width of console port is 9600 Mbps, which can be changed.
Broad cast Domain:
It takes the data to all the points in a switch. It generate conjunction.
Collision Domain:
It senses the line and that the line is free or not. It also generates conjunction. It occurs in Layer1 Switch.
ASIC:
ASIC stand for “Application Specific Integral Circuit”. It is a chip which is used for controlling Broadcasting.
MAC Address Table:
MAC Address Table is used to store the addresses, port no and status of destination and sources. The data is sending in layer2 switch by MAC address table. MAC address table status is changed when the entries are dynamically and when that source and destination which not used upto 500 second the MAC address table flash out the records.

IP Troubleshooting (For Ping Command)

  First of all check the NIC that is it is working properly or not.

  Check the Cable connectivity.

  Check the IP of both the system, both system IP must be same

  Check the Firewall, Firewall must be off

  Check the time zone for both the system, it must be same

  Check that the system which we want to accessing, it must have a user password

  If it is not accessing yet now, restart the system

Switch:

Switch is used to send data from one system another in a network. Commonly switches are Layer1, layer2, Layer3 and Layer4. Layer1 is simply called Hub. Which work on Broadcasting and used in small network. Layer 2 switch is used for little bit large network and it control Broadcasting up to some how. Layer3 switch is known as Router.
Interface of Switch:It may a simple Ethernet or Fast Ethernet. Simple Ethernet is 10mbs and fast Ethernet is 100mbps speed.Console Port: Console port is used to access the IOS of a switch. Rollover cable is used to access the IOS of switch from console port. One end of the cable is plugged in console port and second end cable is plugged un DB-9 connector, which is connected in COM-1 or COM-II port of the mother board in computer. Default band width of console port is 9600 Mbps, which can be changed.
Broad cast Domain: It takes the data to all the points in a switch. It generate conjunction.Collision Domain: It senses the line and that the line is free or not. It also generates conjunction. It occurs in Layer1 Switch.ASIC: ASIC stand for “Application Specific Integral Circuit”. It is a chip which is used for controlling Broadcasting.
MAC Address Table: MAC Address Table is used to store the addresses, port no and status of destination and sources. The data is sending in layer2 switch by MAC address table. MAC address table status is changed when the entries are dynamically and when that source and destination which not used upto 500 second the MAC address table flash out the records.

When the records are enter statically so it remain constant and by this way we can restrict some one to use only the selected port.

A Switch performs:

1.  Learning

2.  Forwarding

3.  Filtering

Learning:

Learning means when data is reached from source to destination, the destination send back an Acknowledgement to source for successfully arrival. So the destination find out the source address for the MAC address table and send the ACK only to source system, it is called Learning.

Forwarding:

When a source “aa” send data to “bb”, and also “bb” send back ACK to source “aa” the address of both the source and destination is stored in MAC address table. When “aa” want to send more data to “bb”  the address of “bb” present in MAC address table, it only read for it and simply forward it on the address of “bb”. It is called Forwarding.

Filtering:

When a Hub is connected to the switch and on the Hub “kk” and “mm” are connected to it. When “kk” want to send data to “mm” so the data will be blocked on the last port of switch which is connected to the Hub, and data will only be broadcasting in Hub not to switch too. It is called Filtering.

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