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2017 Mar 200-125 real exam

Q61.  - (Topic 7)

In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

A. during high traffic periods

B. after broken links are re-established

C. when upper-layer protocols require high reliability

D. in an improperly implemented redundant topology

E. when a dual ring topology is in use

Answer: D


If we connect two switches via 2 or more links and do not enable STP on these switches then a loop (which creates multiple copies of the same unicast frame) will occur. It is an example of an improperly implemented redundant topology.

Q62.  - (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.

Q63.  - (Topic 3)

What is the default administrative distance of OSPF?

A. 90

B. 100

C. 110

D. 120

Answer: C


Administrative distance is the feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing

protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value.

Default Distance Value Table

This 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

Q64.  - (Topic 3)

Why do large OSPF networks use a hierarchical design? (Choose three.)

A. to decrease latency by increasing bandwidth

B. to reduce routing overhead

C. to speed up convergence

D. to confine network instability to single areas of the network

E. to reduce the complexity of router configuration

F. to lower costs by replacing routers with distribution layer switches

Answer: B,C,D


OSPF implements a two-tier hierarchical routing model that uses a core or backbone tier known as area zero (0). Attached to that backbone via area border routers (ABRs) are a number of secondary tier areas. The hierarchical approach is used to achieve the following:

•Rapid convergence because of link and/or switch failures

•Deterministic traffic recovery

•Scalable and manageable routing hierarchy, reduced routing overhead.

Q65.  - (Topic 3)

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router?

A. 2

B. 8

C. 16

D. unlimited

Answer: B


maximum-paths (OSPF)

To control the maximum number of parallel routes that Open Shortest Path First (OSPF) can support, use the maximum-paths command.

Syntax Description


Maximum number of parallel routes that OSPF can install in a routing table. The range is from 1 to 16 routes.

Command Default

8 paths

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Q66.  - (Topic 3)

Which command is used to display the collection of OSPF link states?

A. show ip ospf link-state

B. show ip ospf lsa database

C. show ip ospf neighbors

D. show ip ospf database

Answer: D


The “show ip ospf database” command displays the link states. Here is an example: Here is the lsa database on R2.

R2#show ip ospf database

OSPF Router with ID ( (Process ID 1) Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count 793 0x80000003 0x004F85 2 776 0x80000004 0x005643 1 755 0x80000005 0x0059CA 2 775 0x80000005 0x00B5B1 2

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum 794 0x80000001 0x001E8B 812 0x80000001 0x004BA9 755 0x80000001 0x007F16 775 0x80000001 0x00C31F

Q67.  - (Topic 5)

Refer to the exhibit.

Which subnet mask will place all hosts on Network B in the same subnet with the least amount of wasted addresses?





Answer: B


310 hosts < 512 = 29 -> We need a subnet mask of 9 bits 0 -> 1111 1111.1111 1111.1111

1110.0000 0000 ->

Q68.  - (Topic 5)

What is the default Syslog facility level?

A. local4

B. local5

C. local6

D. local7

Answer: D


By default, Cisco IOS devices, CatOS switches, and VPN 3000 Concentrators use facility local7 while Cisco PIX Firewalls use local4 to send syslog messages. Moreover, most Cisco devices provide options to change the facility level from their default value.

Reference: http://www.ciscopress.com/articles/article.asp?p=426638

Q69.  - (Topic 5)

What are the Popular destinations for syslog messages to be saved? (Choose three)

A. Flash

B. The logging buffer .RAM

C. The console terminal

D. Other terminals

E. Syslog server

Answer: B,C,E


By default, switches send the output from system messages and debug privileged EXEC commands to a logging process. The logging process controls the distribution of logging messages to various destinations, such as the logging buffer (on RAM), terminal lines (console terminal), or a UNIX syslog server, depending on your configuration. The process also sends messages to the console.

Note: Syslog messages can be written to a file in Flash memory although it is not a popular place to use. We can configure this feature with the command logging file flash:filename.

Q70.  - (Topic 8)

Which component of the routing table ranks routing protocols according to their preferences?

A. administrative distance

B. next hop

C. metric

D. routing protocol code

Answer: A


Administrative distance - This is the measure of trustworthiness of the source of the route. If a router learns about a destination from more than one routing protocol, administrative distance is compared and the preference is given to the routes with lower administrative distance. In other words, it is the believability of the source of the route.