2017 Cisco Official New Released 200-125 ♥♥
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Q136.  - (Topic 3)

Which type of EIGRP route entry describes a feasible successor?

A. a backup route, stored in the routing table

B. a primary route, stored in the routing table

C. a backup route, stored in the topology table

D. a primary route, stored in the topology table

Answer: C


EIGRP uses the Neighbor Table to list adjacent routers. The Topology Table list all the learned routers to destination whilst the Routing Table contains the best route to a destination, which is known as the Successor. The Feasible Successor is a backup route to a destination which is kept in the Topology Table.

Q137.  - (Topic 8)

Which switching method duplicates the first six bytes of a frame before making a switching decision?

A. fragment-free switching

B. store and-forward switching

C. cut through switching

D. ASIC switching

Answer: C

Explanation: Cut and Through method has lowest latency. In this method Switch only read first six bytes from frame after the preamble. These six bytes are the destination address of frame. This is the fastest method of switching. This method also processes invalid frames. Only advantage of this method is speed.

Q138.  - (Topic 7)

Refer to the exhibit.

A problem with network connectivity has been observed. It is suspected that the cable connected to switch port Fa0/9 on Switch1 is disconnected. What would be an effect of this cable being disconnected?

A. Host B would not be able to access the server in VLAN9 until the cable is reconnected.

B. Communication between VLAN3 and the other VLANs would be disabled.

C. The transfer of files from Host B to the server in VLAN9 would be significantly slower.

D. For less than a minute, Host B would not be able to access the server in VLAN9. Then normal network function would resume.

Answer: D


Spanning-Tree Protocol (STP) is a Layer 2 protocol that utilizes a special-purpose algorithm to discover physical loops in a network and effect a logical loop-free topology. STP creates a loop-free tree structure consisting of leaves and branches that span the entire Layer 2 network. The actual mechanics of how bridges communicate and how the STP algorithm works will be discussed at length in the following topics. Note that the terms bridge and switch are used interchangeably when discussing STP. In addition, unless otherwise indicated, connections between switches are assumed to be trunks.

Q139.  - (Topic 8)

Which route source code represents the routing protocol with a default administrative distance of 90 in the routing table?

A. S

B. E

C. D

D. R

E. O

Answer: C



Default Administrative distance of EIGRP protocol is 90 then answer is C

Default Distance Value TableThis table lists the administrative distance default values of the protocols that Cisco supports:

Route Source

Default Distance Values

Connected interface 0

Static route 1

Enhanced Interior Gateway Routing Protocol (EIGRP) summary route 5

External Border Gateway Protocol (BGP) 20

Internal EIGRP 90

IGRP 100 OSPF 110

Intermediate System-to-Intermediate System (IS-IS) 115

Routing Information Protocol (RIP) 120

Exterior Gateway Protocol (EGP) 140

On Demand Routing (ODR) 160

External EIGRP 170

Internal BGP 200

Unknown* 255

Q140.  - (Topic 5)

Refer to the exhibit.

Which address range efficiently summarizes the routing table of the addresses for router Main?





Answer: B


The network is the best option as it includes all networks from – and does it more efficiently than the /16 and /18 subnets. The /21 subnet will not include all the other subnets in this one single summarized address.

Q141.  - (Topic 6)

Which statement about access lists that are applied to an interface is true?

A. You can place as many access lists as you want on any interface.

B. You can apply only one access list on any interface.

C. You can configure one access list, per direction, per Layer 3 protocol.

D. You can apply multiple access lists with the same protocol or in different directions.

Answer: C


We can have only 1 access list per protocol, per direction and per interface. It means:

+ We cannot have 2 inbound access lists on an interface

+ We can have 1 inbound and 1 outbound access list on an interface

Q142. - (Topic 5)

What is a valid HSRP virtual MAC address?

A. 0000.5E00.01A3 

B. 0007.B400.AE01 

C. 0000.0C07.AC15 

D. 0007.5E00.B301

Answer: C


With HSRP, two or more devices support a virtual router with a fictitious MAC address and unique IP address. There are two version of HSRP.

+ With HSRP version 1, the virtual router’s MAC address is 0000.0c07.ACxx , in which xx is the HSRP group.

+ With HSRP version 2, the virtual MAC address if 0000.0C9F.Fxxx, in which xxx is the HSRP group.

Note: Another case is HSRP for IPv6, in which the MAC address range from 0005.73A0.0000 through 0005.73A0.0FFF.

Q143.  - (Topic 8)

Refer to the exhibit.

What is the effect of the given configuration?

A. It configures an inactive switch virtual interface.

B. It configures an active management interface.

C. It configures the native VLAN.

D. It configures the default VLAN.

Answer: A

Q144.  - (Topic 5)

Which statement is correct regarding the operation of DHCP?

A. A DHCP client uses a ping to detect address conflicts.

B. A DHCP server uses a gratuitous ARP to detect DHCP clients.

C. A DHCP client uses a gratuitous ARP to detect a DHCP server.

D. If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.

E. If an address conflict is detected, the address is removed from the pool for an amount of time configurable by the administrator.

F. If an address conflict is detected, the address is removed from the pool and will not be reused until the server is rebooted.

Answer: D


An address conflict occurs when two hosts use the same IP address. During address assignment, DHCP checks for conflicts using ping and gratuitous ARP. If a conflict is detected, the address is removed from the pool. The address will not be assigned until the administrator resolves the conflict.

(Reference: http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html)

Q145.  - (Topic 8)


You are a junior network engineer for a financial company, and the main office network is experiencing network issues. Troubleshoot the network issues.

Router R1 connects the main office to the internet, and routers R2 and R3 are internal routers.

NAT is enabled on router R1.

The routing protocol that is enabled between routers R1, R2 and R3 is RIPv2.

R1 sends the default route into RIPv2 for the internal routers to forward internet traffic to R1.

You have console access on R1, R2 and R3 devices. Use only show commands to troubleshoot the issues.

Users complain that they are unable to reach internet sites. You are troubleshooting internet connectivity problem at main office. Which statement correctly identifies the problem on Router R1?

A. Interesting traffic for NAT ACL is incorrectly configured.

B. NAT configurations on the interfaces are incorrectly configured

C. NAT translation statement incorrectly configured.

D. Only static NAT translation configured for the server, missing Dynamic NAT or Dynamic NAT overloading for internal networks.

Answer: B

Q146.  - (Topic 5)

The network administrator is asked to configure 113 point-to-point links. Which IP addressing scheme defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?

A. subnetted with mask 

B. subnetted with mask 

C. subnetted with mask 

D. subnetted with mask 

E. subnetted with mask

Answer: D


We need 113 point-to-point links which equal to 113 sub-networks < 128 so we need to borrow 7 bits (because 2^7 = 128).

The network used for point-to-point connection should be /30. So our initial network should be 30 – 7 = 23.

So is the correct answer.

You can understand it more clearly when writing it in binary form:

/23 = 1111 1111.1111 1110.0000 0000

/30 = 1111 1111.1111 1111.1111 1100 (borrow 7 bits)

Q147.  - (Topic 7)

What are three reasons to collect Netflow data on a company network? (Choose three.)

A. To identify applications causing congestion.

B. To authorize user network access.

C. To report and alert link up / down instances.

D. To diagnose slow network performance, bandwidth hogs, and bandwidth utilization.

E. To detect suboptimal routing in the network.

F. To confirm the appropriate amount of bandwidth that has been allocated to each Class of Service.

Answer: A,D,F


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.

Q148.  - (Topic 3)

Refer to the exhibit.

According to the routing table, where will the router send a packet destined for





Answer: C


The destination IP address belongs to, & subnets but the “longest prefix match” algorithm will choose the most specific subnet mask

-> the prefix “/29 will be chosen to route the packet. Therefore the next-hop should be ->.

Q149.  - (Topic 8)

Which command can you execute to set the user inactivity timer to 10 seconds?

A. SW1(config-line)#exec-timeout 0 10

B. SW1(config-line)#exec-timeout 10

C. SW1(config-line)#absolute-timeout 0 10

D. SW1(config-line)#absolute-timeout 10

Answer: A

Q150.  - (Topic 8)

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

Answer: C