[Free] 2017(Feb) Ensurepass Testinsides Cisco 200-125 Practice Test 181-190

Ensurepass

CCNA Routing and Switching v3.0

 

QUESTION 181

What is the purpose of Inverse ARP?

 

A.

to map a known IP address to a MAC address

B.

to map a known DLCI to a MAC address

C.

to map a known MAC address to an IP address

D.

to map a known DLCI to an IP address

E.

to map a known IP address to a SPID

F.

to map a known SPID to a MAC address

 

Correct Answer: D

Explanation:

Dynamic address mapping relies on the Frame Relay Inverse Address Resolution Protocol (Inverse ARP), defined by RFC 1293, to resolve a next hop network protocol (IP) address to a local DLCI value. The Frame Relay router sends out Inverse ARP requests on its Frame Relay PVC to discover the protocol address of the remote device connected to the Frame Relay network. The responses to the Inverse ARP requests are used to populate an address-to-DLCI mapping table on the Frame Relay router or access server. The router builds and maintains this address-to-DLCI mapping table, which contains all resolved Inverse ARP requests, including both dynamic and static mapping entries.

 

 

QUESTION 182

What is the result of issuing the frame-relay map ip 192.168.1.2 202 broadcast command?

 

A.

defines the destination IP address that is used in all broadcast packets on DCLI 202

B.

defines the source IP address that is used in all broadcast packets on DCLI 202

C.

defines the DLCI on which packets from the 192.168.1.2 IP address are received

D.

defines the DLCI that is used for all packets that are sent to the 192.168.1.2 IP address

 

Correct Answer: D

Explanation:

This command identifies the DLCI that should be used for all packets destined to the 192.168.1.2 address. In this case, DLCI 202 should be used.

 

 

QUESTION 183

Which protocol is an open standard protocol framework that is commonly used in VPNs, to provide secure end-to-end communications?

 

A.

RSA

B.

L2TP

C.

IPsec

D.

PPTP

 

Correct Answer: C

Explanation:

IPSec is a framework of open standards that provides data confidentiality, data integrity, and data authentication between participating peers at the IP layer. IPSec can be used to protect one or more data flows between IPSec peers.

 

 

QUESTION 184

RouterA is unable to reach RouterB. Both routers are running IOS version 12.0. After reviewing the command output and graphic, what is the most likely cause of the problem?

 

clip_image002

 

A.

incorrect bandwidth configuration

B.

incorrect LMI configuration

C.

incorrect map statement

D.

incorrect IP address

 

Correct Answer: C

Explanation:

First we have to say this is an unclear question and it is wrong. The “frame-relay map ip” statement is correct thus none of the four answers above is correct. But we guess there is a typo in the output. Maybe the “ip address 172.16.100.2 255.255.0.0 command should be “ip address 172.16.100.1 255.255.0.0. That makes answer C correct.

 

 

QUESTION 185

What occurs on a Frame Relay network when the CIR is exceeded?

 

A.

All TCP traffic is marked discard eligible.

B.

All UDP traffic is marked discard eligible and a BECN is sent.

C.

All TCP traffic is marked discard eligible and a BECN is sent.

D.

All traffic exceeding the CIR is marked discard eligible.

 

Correct Answer: D

Explanation:

Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the Frame Relay switch. Frames that are sent in excess of the CIR are marked as discard eligible (DE) which means they can be dropped if the congestion occurs within the Frame Relay network.

Note: In the Frame Relay frame format, there is a bit called Discard eligible (DE) bit that is used to identify frames that are first to be dropped when the CIR is exceeded.

 

 

QUESTION 186

DRAG DROP

clip_image004

 

Correct Answer:

 

 

 

QUESTION 187

A network administrator needs to configure a serial link between the main office and a remote location. The router at the remote office is a non-Cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?

 

A.

Main(config)# interface serial 0/0

Main(config-if)# ip address 172.16.1.1 255.255.255.252

Main(config-if)# no shut

B.

Main(config)# interface serial 0/0

Main(config-if)# ip address 172.16.1.1 255.255.255.252

Main(config-if)# encapsulation ppp

Main(config-if)# no shut

C.

Main(config)# interface serial 0/0

Main(config-if)# ip address 172.16.1.1 255.255.255.252

Main(config-if)# encapsulation frame-relay

Main(config-if)# authentication chap

Main(config-if)# no shut

D.

Main(config)# interface serial 0/0

Main(config-if)#ip address 172.16.1.1 255.255.255.252

Main(config-if)#encapsulation ietf

Main(config-if)# no shut

 

Correct Answer: B

Explanation:

With serial point to point links there are two options for the encapsulation. The default, HDLC, is Cisco proprietary and works only with other Cisco routers. The other option is PPP which is standards based and supported by all vendors.

 

 

QUESTION 188

Which two statements about using the CHAP authentication mechanism in a PPP link are true? (Choose two.)

 

A.

CHAP uses a two-way handshake.

B.

CHAP uses a three-way handshake.

C.

CHAP authentication periodically occurs after link establishment.

D.

CHAP authentication passwords are sent in plaintext.

E.

CHAP authentication is performed only upon link establishment.

F.

CHAP has no protection from playback attacks.

 

Correct Answer: BC

Explanation:

CHAP is an authentication scheme used by Point to Point Protocol (PPP) servers to validate the identity of remote clients. CHAP periodically verifies the identity of the client by using a three-way handshake. This happens at the time of establishing the initial link (LCP), and may happen again at any time afterwards. The verification is based on a shared secret (such as the client user’s password).

 

 

QUESTION 189

Which three are the components of SNMP? (Choose three)

 

A.

MIB

B.

SNMP Manager

C.

SysLog Server

D.

SNMP Agent

E.

Set

 

Correct Answer: ABD

Explanation:

SNMP is an application-layer protocol that provides a message format for communication between SNMP managers and agents. SNMP provides a standardized framework and a common language used for the monitoring and management of devices in a network.

The SNMP framework has three parts:

 

+ An SNMP manager

+ An SNMP agent

+ A Management Information Base (MIB)

 

The SNMP manager is the system used to control and monitor the activities of network hosts using SNMP. The most common managing system is called a Network Management System (NMS). The term NMS can be applied to either a dedicated device used for network management, or the applications used on such a device. A variety of network management applications are available for use with SNMP. These features range from simple command-line applications to feature-rich graphical user interfaces (such as the CiscoWorks2000 line of products).

 

The SNMP agent is the software component within the managed device that maintains the data for the device and reports these data, as needed, to managing systems. The agent and MIB reside on the routing device (router, access server, or switch). To enable the SNMP agent on a Cisco routing device, you must define the relationship between the manager and the agent.

 

The Management Information Base (MIB) is a virtual information storage area for network management information, which consists of collections of managed objects.

 

 

QUESTION 190

What is the default Syslog facility level?

 

A.

local4

B.

local5

C.

local6

D.

local7

 

Correct Answer: D

Explanation:

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

 

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