[Free] 2017(July) EnsurePass Examcollection Cisco 200-125 Dumps with VCE and PDF 171-180

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CCNA Cisco Certified Network Associate CCNA (v3.0)

Question No: 171 – (Topic 4)

RouterA is unable to reach RouterB. Both routers are running IOS version 12.0.

image

After reviewing the command output and graphic, what is the most likely cause of the problem?

  1. incorrect bandwidth configuration

  2. incorrect LMI configuration

  3. incorrect map statement

  4. incorrect IP address

Answer: C

Explanation:

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

Question No: 172 – (Topic 4)

Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?

  1. Router(config-if)# ppp authentication chap fallback ppp

  2. Router(config-if)# ppp authentication chap pap

  3. Router(config-if)# authentication ppp chap fallback ppp

  4. Router(config-if)# authentication ppp chap pap

Answer: B Explanation:

This command tells the router first to use CHAP and then go to PAP if CHAP isn#39;t available.

Question No: 173 – (Topic 4)

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

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

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

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

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

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 No: 174 – (Topic 4)

Users have been complaining that their Frame Relay connection to the corporate site is very slow. The network administrator suspects that the link is overloaded.

image

Based on the partial output of the Router# show frame relay pvc command shown in the graphic, which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion?

  1. DLCI = 100

  2. last time PVC status changed 00:25:40

  3. in BECN packets 192

  4. in FECN packets 147

  5. in DE packets 0

Answer: C Explanation:

If device A is sending data to device B across a Frame Relay infrastructure and one of the intermediate Frame Relay switches encounters congestion, congestion being full buffers, over-subscribed port, overloaded resources, etc, it will set the BECN bit on packets being returned to the sending device and the FECN bit on the packets being sent to the receiving device.

Question No: 175 – (Topic 4)

Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers?

  1. IETF

  2. ANSI Annex D

  3. Q9333-A Annex A

  4. HDLC

Answer: A Explanation:

Cisco supports two Frame Relay encapsulation types: the Cisco encapsulation and the IETF Frame Relay encapsulation, which is in conformance with RFC 1490 and RFC 2427. The former is often used to connect two Cisco routers while the latter is used to connect a Cisco router to a non-Cisco router. You can test with your Cisco router when typing the command Router(config-if)#encapsulation frame-relay ? on a WAN link. Below is the output of this command (notice Cisco is the default encapsulation so it is not listed here, just press Enter to use it).

image

Note: Three LMI options are supported by Cisco routers are ansi, Cisco, and Q933a. They represent the ANSI Annex D, Cisco, and ITU Q933-A (Annex A) LMI types, respectively.

HDLC is a WAN protocol same as Frame-Relay and PPP so it is not a Frame Relay encapsulation type.

Question No: 176 – (Topic 4)

What is the purpose of Inverse ARP?

  1. to map a known IP address to a MAC address

  2. to map a known DLCI to a MAC address

  3. to map a known MAC address to an IP address

  4. to map a known DLCI to an IP address

  5. to map a known IP address to a SPID

  6. to map a known SPID to a MAC address

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 No: 177 DRAG DROP – (Topic 4)

Drag the Frame Relay acronym on the left to match its definition on the right. (Not all acronyms are used.)

image

Answer:

image

Question No: 178 – (Topic 4)

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

  1. RSA

  2. L2TP

  3. IPsec

  4. PPTP

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 No: 179 – (Topic 4)

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

  1. All TCP traffic is marked discard eligible.

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

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

  4. All traffic exceeding the CIR is marked discard eligible.

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 No: 180 – (Topic 4)

What are three reasons that an organization with multiple branch offices and roaming users might implement a Cisco VPN solution instead of point-to-point WAN links? (Choose three.)

  1. reduced cost

  2. better throughput

  3. broadband incompatibility

  4. increased security

  5. scalability

  6. reduced latency

Answer: A,D,E Explanation:

IPsec offer a number of advantages over point to point WAN links, particularly when

multiple locations are involved. These include reduced cost, increased security since all traffic is encrypted, and increased scalability as s single WAN link can be used to connect to all locations in a VPN, where as a point to point link would need to be provisioned to each location.

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