[Free] 2017(July) EnsurePass Examcollection Cisco 200-105 Dumps with VCE and PDF 141-150

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Interconnecting Cisco Networking Devices Part 2 (ICND2 v3.0)

Question No: 141 – (Topic 4)

What is the advantage of using a multipoint interface instead of point-to-point subinterfaces when configuring a Frame Relay hub in a hub-and-spoke topology?

  1. It avoids split-horizon issues with distance vector routing protocols.

  2. IP addresses can be conserved if VLSM is not being used for subnetting.

  3. A multipoint interface offers greater security compared to point-to-point subinterface configurations.

  4. The multiple IP network addresses required for a multipoint interface provide greater addressing flexibility over point-to-point configurations.

Answer: B Explanation:

You do not have to assign a separate subnet per sub-interface .if you#39;re using a Class A network (10.x.x.x/8), you blow the whole network on a few connections (if you used VLSM, you could use a better mask, limit the addresses used). if you used 10.0.0.0/8, you would not be assigning the entire /8 to a single network. You would select a subnet mask for the

network and then, you would have to use that mask with all subnets of the network. So if you chose a /24 mask, that would mean that you would have to use a /24 mask for even point-to-point links.

Question No: 142 – (Topic 4)

Refer to the exhibit.

image

Which WAN protocol is being used?

  1. ATM

  2. HDLC

  3. Frame Relay

  4. PPP

Answer: C Explanation:

quot;Show interface pos8/0/0quot; command showing LMI enq sent which show frame-relay encapsulation enabled on this interface. Cisco supports three different Local Management Interface (LMI) types for Frame Relay: Cisco, ANSI Annex D, and Q933-A Annex A http://www.ciscopress.com/articles/article.asp?p=170741amp;seqNum=3

Question No: 143 – (Topic 4)

Which PPP subprotocol negotiates authentication options?

  1. NCP

  2. ISDN

  3. SLIP

  4. LCP

  5. DLCI

Answer: D Explanation:

A protocol that establishes, configures, and tests data link connections used by the PPP Link Control Protocol offers PPP encapsulation different options, including the following: Authentication – options includes PAP and CHAP Compression – Data compression increases the throughput on a network link, by reducing the amount of data that must be transmitted. Error Detection -Quality and Magic numbers are used by PPP to ensure a reliable, loop-free data link.

Multilink – Supported in IOS 11.1 and later, multilink is supported on PPP links between Cisco routers. This splits the load for PPP over two or more parallel circuits and is called a bundle.

Question No: 144 – (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:

http://www.ciscopress.com/articles/article.asp?p=170741amp;seqNum=4

Frame-Relay (a Layer 2 protocol) uses Inverse-Arp to map a know Layer 2 Address (DLCI) to a unknow Layer 3 Address.

Dynamic Mapping

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 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.

When data needs to be transmitted to a remote destination address, the router performs a lookup on its routing table to determine whether a route to that destination address exists and the next hop address or directly connected interface to use in order to reach that destination. Subsequently, the router consults its address-to-DLCI mapping table for the local DLCI that corresponds to the next hop address. Finally, the router places the frames targeted to the remote destination on its identified outgoing local DLCI.

On Cisco routers, dynamic Inverse ARP is enabled by default for all network layer protocols enabled on the physical interface. Packets are not sent out for network layer protocols that are not enabled on the physical interface. For example, no dynamic Inverse ARP resolution is performed for IPX if ipx routing is not enabled globally and there is no active IPX address assigned to the interface. Because dynamic Inverse ARP is enabled by default, no additional Cisco IOS command is required to enable it on an interface.

Example 4-16 shows the output of the show frame-relay map privileged EXEC mode command. The addressto-DLCI mapping table displays useful information. The output of the command shows that the next hop address 172.16.1.2 is dynamically mapped to the local DLCI 102, broadcast is enabled on the interface, and the interface#39;s status is currently active.

NOTE

After enabling Frame Relay on the interface, the Cisco router does not perform Inverse ARP until IP routing is enabled on the router. By default, IP routing is enabled on a Cisco router. If IP routing has been turned off, enable IP routing with the ip routing command in the global configuration mode. After IP routing is enabled, the router performs Inverse ARP and begins populating the address-to-DLCI mapping table with resolved entries.

Question No: 145 – (Topic 4)

What command is used to verify the DLCI destination address in a Frame Relay static

configuration?

  1. show frame-relay pvc

  2. show frame-relay lmi

  3. show frame-relay map

  4. show frame relay end-to-end

Answer: C Explanation:

Cisco Frame Relay Configurations http://www.ciscopress.com/articles/article.asp?p=170741amp;seqNum=9 show frame-relay map

The show frame-relay map privileged EXEC mode command shows the contents of the next hop protocol address to DLCI mapping table on the router. The table contains both dynamic mapped and static mapped entries. The below example shows a sample output of the show frame-relay map command.

Router#show frame-relay map

Serial1/2 (up): ip 172.16.1.4 dlci 401(0x191,0x6410), dynamic, broadcast,, status defined, active

Serial1/2 (up): ip 172.16.1.5 dlci 501(0x1F5,0x7C50), dynamic, broadcast,, status defined, active

Serial1/2 (up): ip 172.16.1.2 dlci 301(0x12D,0x48D0), dynamic, broadcast,, status defined, active

Question No: 146 – (Topic 4)

Refer to the exhibit.

image

Which statement describes DLCI 17?

  1. DLCI 17 describes the ISDN circuit between R2 and R3.

  2. DLCI 17 describes a PVC on R2. It cannot be used on R3 or R1.

  3. DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3.

  4. DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider.

Answer: C Explanation:

DLCI stands for Data Link Connection Identifier. DLCI values are used on Frame Relay interfaces to distinguish between different virtual circuits. DLCIs have local significance because, the identifier references the point between the local router and the local Frame Relay switch to which the DLCI is connected.

Question No: 147 – (Topic 4)

Which command allows you to verify the encapsulation type (CISCO or IETF) for a Frame Relay link?

  1. show frame-relay lmi

  2. show frame-relay map

  3. show frame-relay pvc

  4. show interfaces serial

Answer: B

Explanation: map will show frame relay encapsulation (cisco or ietf) http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp102934 3

quot;show frame-relay mapquot; will show frame relay encapsulation type (CISCO or IETF)

image

Question No: 148 – (Topic 4)

At which layer of the OSI model does PPP perform?

  1. Layer 2

  2. Layer 3

  3. Layer 4

  4. Layer 5

Answer: A Explanation:

Point-to-Point Protocol (PPP) is a data link protocol commonly used in establishing a direct connection between two networking nodes. It can provide connection authentication, transmission encryption (using ECP, RFC 1968), and compression.

Question No: 149 – (Topic 4)

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?

  1. Main(config)# interface serial 0/0

    Main(config-if)# ip address 172.16.1.1 255.255.255.252 Main(config-if)# no shut

  2. 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

  3. 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

  4. 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

Answer: B Explanation:

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. So HDLC runs only in Cisco router. PPP is not proprietary protocol it#39;s a open source every cisco router and non-cisco router understand the PPP protocol.So we need to configure the PPP protocol if connection is between cisco and non-cisco router.

Question No: 150 – (Topic 4)

Refer to the exhibit.

image

The show interfaces serial 0/1 command was issued on the R10-1 router. Based on the output displayed which statement is correct?

  1. The cable connected to the serial 0/1 interface of the R10-1 router is a DTE cable.

  2. The R10-1 router can ping the router interface connected to the serial 0/1 interface.

  3. The clock rate used for interface serial 0/1 of the R10-1 router is 1,544,000 bits per second.

  4. The CSU used with the serial 0/1 interface of the R10-1 router has lost connection to the service provider.

  5. The interface of the remote router connected to the serial 0/1 interface of the R10-1 router is using the default serial interface encapsulation.

Answer: E Explanation:

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for Cisco HDLC is the default encapsulation type for the serial interfaces.

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