[Free] 2017(July) EnsurePass Examcollection Cisco 200-125 Dumps with VCE and PDF 181-190

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CCNA Cisco Certified Network Associate CCNA (v3.0)

Question No: 181 – (Topic 4)

Which PPP subprotocol negotiates authentication options?

  1. NCP

  2. ISDN

  3. SLIP

  4. LCP

  5. DLCI

Answer: D Explanation:

The PPP Link Control Protocol (LCP) is documented in RFC 1661. LPC negotiates link and PPP parameters to dynamically configure the data link layer of a PPP connection. Common LCP options include the PPP MRU, the authentication protocol, compression of PPP header fields, callback, and multilink options.

Question No: 182 – (Topic 4)

It has become necessary to configure an existing serial interface to accept a second Frame Relay virtual circuit. Which of the following procedures are required to accomplish this task? (Choose three.)

  1. Remove the IP address from the physical interface.

  2. Encapsulate the physical interface with multipoint PPP.

  3. Create the virtual interfaces with the interface command.

  4. Configure each subinterface with its own IP address.

  5. Disable split horizon to prevent routing loops between the subinterface networks.

  6. Configure static Frame Relay map entries for each subinterface network.

Answer: A,C,D Explanation:

For multiple PVC’s on a single interface, you must use subinterfaces, with each subinterface configured for each PVC. Each subinterface will then have its own IP address, and no IP address will be assigned to the main interface.

Question No: 183 – (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:

Sample 鈥渟how frame-relay map鈥?output: R1#sh frame map

Serial0/0 (up): ip 10.4.4.1 dlci 401(0x191,0x6410), dynamic, broadcast,, status defined, active

Serial0/0 (up): ip 10.4.4.3 dlci 403(0x193,0x6430), dynamic, broadcast,, status defined, active

Serial0/0 (up): ip 10.4.4.4 dlci 401(0x191,0x6410), static, CISCO, status defined, active

Question No: 184 – (Topic 4)

The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router.

Which of the following statements is true concerning this command?

  1. This command should be executed from the global configuration mode.

  2. The IP address 10.121.16.8 is the local router port used to forward data.

  3. 102 is the remote DLCI that will receive the information.

  4. This command is required for all Frame Relay configurations.

  5. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.

Answer: E Explanation:

Broadcast is added to the configurations of the frame relay, so the PVC supports broadcast, allowing the routing protocol updates that use the broadcast update mechanism to be forwarded across itself.

Question No: 185 – (Topic 4)

Which two statistics appear in show frame-relay map output? (Choose two.)

  1. the number of BECN packets that are received by the router

  2. the value of the local DLCI

  3. the number of FECN packets that are received by the router

  4. the status of the PVC that is configured on the router

  5. the IP address of the local router

Answer: B,D Explanation:

Sample 鈥渟how frame-relay map鈥?output: R1#sh frame map

Serial0/0 (up): ip 10.4.4.1 dlci 401(0x191,0x6410), dynamic, broadcast,, status defined, active

Serial0/0 (up): ip 10.4.4.3 dlci 403(0x193,0x6430), dynamic, broadcast,, status defined, active

Serial0/0 (up): ip 10.4.4.4 dlci 401(0x191,0x6410), static, CISCO, status defined, active

Question No: 186 – (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:

The Point-to-Point Protocol (PPP) provides a standard method for transporting multi- protocol datagrams over point-to-point links. PPP was originally emerged as an encapsulation protocol for transporting IP traffic between two peers. It is a data link layer protocol (layer 2 in the OSI model)

Question No: 187 – (Topic 4)

What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)

  1. They create split-horizon issues.

  2. They require a unique subnet within a routing domain.

  3. They emulate leased lines.

  4. They are ideal for full-mesh topologies.

  5. They require the use of NBMA options when using OSPF.

Answer: B,C Explanation:

Subinterfaces are used for point to point frame relay connections, emulating virtual point to point leased lines. Each subinterface requires a unique IP address/subnet. Remember, you cannot assign multiple interfaces in a router that belong to the same IP subnet.

Question No: 188 CORRECT TEXT – (Topic 4)

A corporation wants to add security to its network. The requirements are:

->Host B should be able to use a web browser (HTTP) to access the Finance Web Server.

->Other types of access from host B to the Finance Web Server should be blocked.

->All access from hosts in the Core or local LAN to the Finance Web Server should be blocked.

->All hosts in the Core and on local LAN should be able to access the Public Web Server.

You have been tasked to create and apply a numbered access list to a single outbound interface. This access list can contain no more than three statements that meet these requirements.

Access to the router CLI can be gained by clicking on the appropriate host.

->All passwords have been temporarily set to 鈥渃isco鈥?

->The Core connection uses an IP address of 198.18.132.65.

->The computers in the Hosts LAN have been assigned addresses of 192.168.201.1

鈥?192.168.201.254.

->host A 192.168.201.1

->host B 192.168.201.2

->host C 192.168.201.3

->host D 192.168.201.4

->The Finance Web Server has been assigned an address of 172.22.237.17.

->The Public Web Server in the Server LAN has been assigned an address of 172.22.237.18.

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Answer: Please check the below explanation for all details.

Explanation:

We should create an access-list and apply it to the interface that is connected to the Server LAN because it can filter out traffic from both S2 and Core networks. To see which interface this is, use the 鈥渟how ip interface brief鈥?command:

image

From this, we know that the servers are located on the fa0/1 interface, so we will place our numbered access list here in the outbound direction.

Corp1#configure terminal

Our access-list needs to allow host B 鈥?192.168125.2 to the Finance Web Server 172.22.109.17 via HTTP (port 80), so our first line is this:

Corp1(config)#access-list 100 permit tcp host 192.168.125.2 host 172.22.109.17 eq 80

Then, our next two instructions are these:

->Other types of access from host B to the Finance Web Server should be blocked.

->All access from hosts in the Core or local LAN to the Finance Web Server should be blocked.

This can be accomplished with one command (which we need to do as our ACL needs to

be no more than 3 lines long), blocking all other access to the finance web server:

Corp1(config)#access-list 100 deny ip any host 172.22.109.17

Our last instruction is to allow all hosts in the Core and on the local LAN access to the Public Web Server (172.22.109.18)

Corp1(config)#access-list 100 permit ip host 172.22.109.18 any Finally, apply this access-list to Fa0/1 interface (outbound direction) Corp1(config)#interface fa0/1

Corp1(config-if)#ip access-group 100 out

Notice: We have to apply the access-list to Fa0/1 interface (not Fa0/0 interface) so that the access-list can filter traffic coming from both the LAN and the Core networks.

To verify, just click on host B to open its web browser. In the address box type http://172.22.109.17 to check if you are allowed to access Finance Web Server or not. If your configuration is correct then you can access it.

Click on other hosts (A, C and D) and check to make sure you can’t access Finance Web Server from these hosts. Then, repeat to make sure they can reach the public server at 172.22.109.18. Finally, save the configuration

Corp1(config-if)#end

Corp1#copy running-config startup-config

Question No: 189 – (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-Data Link Connection Identifier Bits: The DLCI serves to identify the virtual connection so that the receiving end knows which information connection a frame belongs to. Note that this DLCI has only local significance. Frame Relay is strictly a Layer 2 protocol suite.

Topic 5, Infrastructure Services

Question No: 190 – (Topic 5)

What is the first 24 bits in a MAC address called?

  1. NIC

  2. BIA

  3. OUI

  4. VAI

Answer: C Explanation:

An Organizationally Unique Identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization globally or worldwide.

They are used as the first 24 nits of the MAC address to uniquely identify a particular piece of equipment.

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