Which command would you configure globally on a Cisco router that would allow you to view directly connected Cisco devices?
A.
cdp run
B.
enable cdp
C.
cdp enable
D.
run cdp
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Can someone share the CertBus 200-125 dumps? There are 930 Q&As in the CertBus dumps. https://www.certbus.com/200-125.html
Vendor: Cisco
Certifications: CCNA
Exam Name: CCNA Cisco Certified Network Associate CCNA (v3.0)
Exam Code: 200-125
Total Questions: 930 Q&As
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QUESTION 1
Which technology supports the stateless assignment of IPv6 addresses?
A. DNS
B. DHCPv6
C. DHCP
D. autoconfiguration
Correct Answer: BD
Explanation
QUESTION 2
What are two requirements for an HSRP group? (Choose two.)
A. exactly one active router
B. one or more standby routers
C. one or more backup virtual routers
D. exactly one standby active router
E. exactly one backup virtual router
Correct Answer: AB
Explanation
QUESTION 3
After you configure the Loopback0 interface, which command can you enter to verify the status of the
interface and determine whether fast switching is enabled?
A. Router#show ip interface loopback 0
B. Router#show run
C. Router#show interface loopback 0
D. Router#show ip interface brief
Correct Answer: A
Explanation
QUESTION 4
Which command sequence can you enter to create VLAN 20 and assign it to an interface on a switch?
A. Switch(config)#vlan 20
Switch(config)#Interface gig x/y
Switch(config-if)#switchport access vlan 20
B. Switch(config)#Interface gig x/y
Switch(config-if)#vlan 20
Switch(config-vlan)#switchport access vlan 20
C. Switch(config)#vlan 20
Switch(config)#Interface vlan 20
Switch(config-if)#switchport trunk native vlan 20
D. Switch(config)#vlan 20
Switch(config)#Interface vlan 20
Switch(config-if)#switchport access vlan 20
E. Switch(config)#vlan 20
Switch(config)#Interface vlan 20
Switch(config-if)#switchport trunk allowed vlan 20
Correct Answer: A
Explanation
QUESTION 5
Which three commands can you use to set a router boot image? (Choose three.)
A. Router(config)# boot system flash c4500-p-mz.121-20.bin
B. Router(config)# boot system tftp c7300-js-mz.122-33.SB8a.bin
C. Router(config)#boot system rom c7301-advipservicesk9-mz.124-24.T4.bin
D. Router> boot flash:c180x-adventerprisek9-mz-124-6T.bin
E. Router(config)#boot flash:c180x-adventerprisek9-mz-124-6T.bin
F. Router(config)#boot bootldr bootflash:c4500-jk9s-mz.122-23f.bin
Correct Answer: ABC
Explanation
QUESTION 6
Which two statements about IPv6 and routing protocols are true? (Choose two.)
A. Link-local addresses are used to form routing adjacencies.
B. OSPFv3 was developed to support IPv6 routing.
C. EIGRP, OSPF, and BGP are the only routing protocols that support IPv6.
D. Loopback addresses are used to form routing adjacencies.
E. EIGRPv3 was developed to support IPv6 routing.
Correct Answer: AB
Explanation
QUESTION 7
If primary and secondary root switches with priority 16384 both experience catastrophic losses, which
tertiary switch can take over?
A. a switch with priority 20480
B. a switch with priority 8192
C. a switch with priority 4096
D. a switch with priority 12288
Correct Answer: A
Explanation
QUESTION 8
Which two statements about late collisions are true? (Choose two.)
A. They may indicate a duplex mismatch.
B. By definition, they occur after the 512th bit of the frame has been transmitted.
C. They indicate received frames that did not pass the FCS match.
D. They are frames that exceed 1518 bytes.
E. They occur when CRC errors and interference occur on the cable.
Correct Answer: AB
Explanation
QUESTION 9
Which command can you enter to set the default route for all traffic to an interface?
A. router(config)#ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1
B. router(config)#ip route 0.0.0.0 255.255.255.255 GigabitEthernet0/1
C. router(config-router)#default-information originate
D. router(config-router)#default-information originate always
Correct Answer: A
Explanation
QUESTION 10
Which two spanning-tree port states does RSTP combine to allow faster convergence? (Choose two.)
A. blocking
B. listening
C. learning
D. forwarding
E. discarding
Correct Answer: AB
Explanation
QUESTION 11
If a router has four interfaces and each interface is connected to four switches, how many broadcast
domains are present on the router?
A. 1
B. 2
C. 4
D. 8
Correct Answer: C
Explanation
QUESTION 12
Which command enables IPv6 forwarding on a Cisco router?
A. ipv6 local
B. ipv6 host
C. ipv6 unicast-routing
D. ipv6 neighbor
Correct Answer: C
Explanation
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Hi,
It is really confusing me. I can see 43 Questions at the same I can see some more question and answers shared by folks. Can we pass 200-125 exam if we read all these questions ?
Has anybody passed recently. ? Please advise.
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Why is flash memory erased prior to upgrading the IOS image from the TFTP server?
A. The router cannot verify that the Cisco IOS image currently in flash is valid.
B. Flash memory on Cisco routers can contain only a single IOS image.
C. Erasing current flash content is requested during the copy dialog.
D. In order for the router to use the new image as the default, it must be the only IOS image in flash.
Answer: C
Explanation:
During the copy process, the router asked “Erasing flash before copying? [confirm]” and the
administrator confirmed (by pressing Enter) so the flash was deleted.
Note: In this case, the flash has enough space to copy a new IOS without deleting the current one.
The current IOS is deleted just because the administrator wants to do so. If the flash does not have
enough space you will see an error message like this:
%Error copying tftp://192.168.2.167/ c1600-k8sy-mz.l23-16a.bin (Not enough space on device)
NO.2 Which two commands can be used to verify a trunk link configuration status on a given Cisco
switch interface? (Choose two.)
A. show interface trunk
B. show interface interface
C. show ip interface brief
D. show interface vlan
E. show interface switchport
Answer: A,E
Explanation:
Example output from these two commands:
SW3#show interface trunk
Port Mode Encapsulation Status Native vlan
Fa0/19 auto n-802.1q trunking 1
Fa0/20 auto n-802.1q trunking 1
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2
Fa0/21 auto n-802.1q trunking 1
Fa0/22 auto n-802.1q trunking 1
Port Vlans allowed on trunk
Fa0/19 1-4094
Fa0/20 1-4094
Fa0/21 1-4094
Fa0/22 1-4094
SW1#show interface fast 0/2 switchport
Name: Fa0/2
Switchport: Enabled
Administrative Mode: dynamic desirable
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of TrunkinG. On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
NO.3 Which type of device can be replaced by the use of subinterfaces for VLAN routing?
A. Layer 2 bridge
B. Layer 2 switch
C. Layer 3 switch
D. router
Answer: C
NO.4 Under normal operations, Cisco recommends that you configure switchports on which VLAN?
A. on any VLAN except the default VLAN
B. on the management VLAN
C. on the native VLAN
D. on the default VLAN
Answer: D
NO.5 Which two statements about IPv6 router advertisement messages are true? (Choose two.)
A. They use ICMPv6 type 134.
B. The advertised prefix length must be 64 bits.
C. The advertised prefix length must be 48 bits.
D. They are sourced from the configured IPv6 interface address.
E. Their destination is always the link-local address of the neighboring node.
Answer: A,B
NO.6 Which three options are fields in a basic ethernet data frame ?
A. preamble
B. time to live
C. version
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3
D. header checksum
E. length type
F. frame check sequence
Answer: A,E,F
NO.7 Which three elements must be used when you configure a router interface for VLAN trunking?
(Choose three.)
A. one physical interface for each subinterface
B. one IP network or subnetwork for each subinterface
C. a management domain for each subinterface
D. subinterface encapsulation identifiers that match VLAN tags
E. one subinterface per VLAN
F. subinterface numbering that matches VLAN tags
Answer: B,D,E
Explanation:
This scenario is commonly called a router on a stick.
A short, well written article on this operation can be found here:
NO.8 If two OSPF neighbors have formed complete adjacency and are exchanging link-state
advertisements, which state have they reached?
A. Exstart
B. 2-Way
C. FULL
D. Exchange
Answer: C
Explanation:
https://www.google.com/search?q=state+ospf&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjg7ebX
jtLVAhXJAsAKHXoyATQQ_AUIDCgD&biw=1536&bih=735#imgrc=99-F38FQ0gZgVM:
NO.9 What is one requirement for interfaces to run IPv6?
A. An IPv6 address must be configured on the interface.
B. An IPv4 address must be configured.
C. Stateless autoconfiguration must be enabled after enabling IPv6 on the interface.
D. IPv6 must be enabled with the ipv6 enable command in global configuration mode.
Answer: A
Explanation: To use IPv6 on your router, you must, at a minimum, enable the protocol and assign
IPv6 addresses to your interfaces.
NO.10 Which statement about Cisco Discovery Protocol is true?
A. It is a Cisco-proprietary protocol.
B. It runs on the network layer.
C. It can discover information from routers, firewalls, and switches.
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4
D. It runs on the physical layer and the data link layer.
Answer: A
NO.11 Refer to the exhibit.
After you apply the given configuration to arouter, the DHCP clients behind the device connot
communicate with hosts outside of their subnet. Which action is most likely to correct the problem?
A. Configure the dns server on the same subnet as the clients
B. Activate the dhcp pool
C. Correct the subnet mask
D. configure the default gateway
Answer: D
NO.12 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.
Answer: B,C,F
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Why is flash memory erased prior to upgrading the IOS image from the TFTP server?
A. The router cannot verify that the Cisco IOS image currently in flash is valid.
B. Flash memory on Cisco routers can contain only a single IOS image.
C. Erasing current flash content is requested during the copy dialog.
D. In order for the router to use the new image as the default, it must be the only IOS image in flash.
Answer: C
Explanation:
During the copy process, the router asked “Erasing flash before copying? [confirm]” and the
administrator confirmed (by pressing Enter) so the flash was deleted.
Note: In this case, the flash has enough space to copy a new IOS without deleting the current one.
The current IOS is deleted just because the administrator wants to do so. If the flash does not have
enough space you will see an error message like this:
%Error copying tftp://192.168.2.167/ c1600-k8sy-mz.l23-16a.bin (Not enough space on device)
NO.2 Which two commands can be used to verify a trunk link configuration status on a given Cisco
switch interface? (Choose two.)
A. show interface trunk
B. show interface interface
C. show ip interface brief
D. show interface vlan
E. show interface switchport
Answer: A,E
Explanation:
Example output from these two commands:
SW3#show interface trunk
Port Mode Encapsulation Status Native vlan
Fa0/19 auto n-802.1q trunking 1
Fa0/20 auto n-802.1q trunking 1
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2
Fa0/21 auto n-802.1q trunking 1
Fa0/22 auto n-802.1q trunking 1
Port Vlans allowed on trunk
Fa0/19 1-4094
Fa0/20 1-4094
Fa0/21 1-4094
Fa0/22 1-4094
SW1#show interface fast 0/2 switchport
Name: Fa0/2
Switchport: Enabled
Administrative Mode: dynamic desirable
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of TrunkinG. On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
NO.3 Which type of device can be replaced by the use of subinterfaces for VLAN routing?
A. Layer 2 bridge
B. Layer 2 switch
C. Layer 3 switch
D. router
Answer: C
NO.4 Under normal operations, Cisco recommends that you configure switchports on which VLAN?
A. on any VLAN except the default VLAN
B. on the management VLAN
C. on the native VLAN
D. on the default VLAN
Answer: D
NO.5 Which two statements about IPv6 router advertisement messages are true? (Choose two.)
A. They use ICMPv6 type 134.
B. The advertised prefix length must be 64 bits.
C. The advertised prefix length must be 48 bits.
D. They are sourced from the configured IPv6 interface address.
E. Their destination is always the link-local address of the neighboring node.
Answer: A,B
NO.6 Which three options are fields in a basic ethernet data frame ?
A. preamble
B. time to live
C. version
IT Certification Guaranteed, The Easy Way!
3
D. header checksum
E. length type
F. frame check sequence
Answer: A,E,F
NO.7 Which three elements must be used when you configure a router interface for VLAN trunking?
(Choose three.)
A. one physical interface for each subinterface
B. one IP network or subnetwork for each subinterface
C. a management domain for each subinterface
D. subinterface encapsulation identifiers that match VLAN tags
E. one subinterface per VLAN
F. subinterface numbering that matches VLAN tags
Answer: B,D,E
Explanation:
This scenario is commonly called a router on a stick.
A short, well written article on this operation can be found here:
NO.8 If two OSPF neighbors have formed complete adjacency and are exchanging link-state
advertisements, which state have they reached?
A. Exstart
B. 2-Way
C. FULL
D. Exchange
Answer: C
Explanation:
https://www.google.com/search?q=state+ospf&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjg7ebX
jtLVAhXJAsAKHXoyATQQ_AUIDCgD&biw=1536&bih=735#imgrc=99-F38FQ0gZgVM:
NO.9 What is one requirement for interfaces to run IPv6?
A. An IPv6 address must be configured on the interface.
B. An IPv4 address must be configured.
C. Stateless autoconfiguration must be enabled after enabling IPv6 on the interface.
D. IPv6 must be enabled with the ipv6 enable command in global configuration mode.
Answer: A
Explanation: To use IPv6 on your router, you must, at a minimum, enable the protocol and assign
IPv6 addresses to your interfaces.
NO.10 Which statement about Cisco Discovery Protocol is true?
A. It is a Cisco-proprietary protocol.
B. It runs on the network layer.
C. It can discover information from routers, firewalls, and switches.
IT Certification Guaranteed, The Easy Way!
4
D. It runs on the physical layer and the data link layer.
Answer: A
NO.11 Refer to the exhibit.
After you apply the given configuration to arouter, the DHCP clients behind the device connot
communicate with hosts outside of their subnet. Which action is most likely to correct the problem?
A. Configure the dns server on the same subnet as the clients
B. Activate the dhcp pool
C. Correct the subnet mask
D. configure the default gateway
Answer: D
NO.12 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.
Answer: B,C,F
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