Quick Guide: ccna 200 125 study guide

200-125 Guide

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  • Exam Number/Code 200-125
  • Product Name CCNA Cisco Certified Network Associate CCNA (v3.0)
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Quick Guide: ccna 200 125 study guide

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New Cisco 200-125 Exam Dumps Collection (Question 10 - Question 19)

Question No: 10

Which command can you use to manually assign a static IPv6 address to a router interface?

A. ipv6 autoconfig 2001:db8:2222:7272::72/64

B. ipv6 address 2001:db8:2222:7272::72/64

C. ipv6 address PREFIX_1 ::1/64

D. ipv6 autoconfig

Answer: B

Explanation:

To assign an IPv6 address to an interface, use the u201cipv6 addressu201d command and specify the IP address you wish to use.


Question No: 11

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?

A. 255.255.255.0

B. 255.255.254.0

C. 255.255.252.0

D. 255.255.248.0

Answer: B

Explanation:

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

1110.0000 0000 -> 255.255.254.0


Question No: 12

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.

Answer: B,C

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).

Topic 9, Infrastructure Services

765.Which IPv6 address is the equivalent of the IPv4 interface loopback address 127.0.0.1?

A. ::1

B. ::

C. 2000::/3

D. 0::/10


Question No: 13

Refer to the exhibit.

When running EIGRP, what is required for RouterA to exchange routing updates with RouterC?

A. AS numbers must be changed to match on all the routers

B. Loopback interfaces must be configured so a DR is elected

C. The no auto-summary command is needed on Router A and Router C

D. Router B needs to have two network statements, one for each connected network

Answer: A

Explanation:

This question is to examine the understanding of the interaction between EIGRP routers. The following information must be matched so as to create neighborhood.

EIGRP routers to establish, must match the following information:

1. AS Number;

2. K value.


Question No: 14

Refer to the exhibit.

What is the meaning of the term dynamic as displayed in the output of the show frame- relay map command shown?

A. The Serial0/0 interface is passing traffic.

B. The DLCI 100 was dynamically allocated by the router.

C. The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server.

D. The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay cloud.

E. The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned

through Inverse ARP.

Answer: E

Explanation:

Inverse Address Resolution Protocol (Inverse ARP) was developed to provide a mechanism for dynamic DLCI to Layer 3 address maps. Inverse ARP works much the same way Address Resolution Protocol (ARP) works on a LAN. However, with ARP, the device knows the Layer 3 IP address and needs to know the remote data link MAC address. With Inverse ARP, the router knows the Layer 2 address which is the DLCI, but needs to know the remote Layer 3 IP address.

When using dynamic address mapping, Inverse ARP requests a next-hop protocol address for each active PVC. Once the requesting router receives an Inverse ARP response, it updates its DLCI-to-Layer 3 address mapping table. Dynamic address mapping is enabled by default for all protocols enabled on a physical interface. If the Frame Relay environment supports LMI autosensing and Inverse ARP, dynamic address mapping takes place automatically. Therefore, no static address mapping is required.


Question No: 15

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.)

A. Remove the IP address from the physical interface.

B. Encapsulate the physical interface with multipoint PPP.

C. Create the virtual interfaces with the interface command.

D. Configure each subinterface with its own IP address.

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

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

Answer: A,C,D

Explanation:

For multiple PVCu2019s 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: 16

What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two.)

A. hello packets

B. SAP messages sent by other routers

C. LSAs from other routers

D. beacons received on point-to-point links

E. routing tables received from other link-state routers

F. TTL packets from designated routers

Answer: A,C

Explanation:

Neighbor discovery is the first step in getting a link state environment up and running. In keeping with the friendly neighbor terminology, a Hello protocol is used for this step. The protocol will define a Hello packet format and a procedure for exchanging the packets and processing the information the packets contain.

After the adjacencies are established, the routers may begin sending out LSAs. As the term flooding implies, the advertisements are sent to every neighbor. In turn, each received LSA is copied and forwarded to every neighbor except the one that sent the LSA.


Question No: 17

Which of these represents an IPv6 link-local address?

A. FE80::380e:611a:e14f:3d69

B. FE81::280f:512b:e14f:3d69

C. FEFE:0345:5f1b::e14d:3d69

D. FE08::280e:611:a:f14f:3d69

Answer: A

Explanation:

In the Internet Protocol Version 6 (IPv6), the address block fe80::/10 has been reserved for link-local unicast addressing. The actual link local addresses are assigned with the prefix fe80::/64. They may be assigned by automatic (stateless) or stateful (e.g. manual) mechanisms.


Question No: 18

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

u2711 Host B should be able to use a web browser (HTTP) to access the Finance Web Server.

u2711 Other types of access from host B to the Finance Web Server should be blocked.

u2711 All access from hosts in the Core or local LAN to the Finance Web Server should be blocked.

u2711 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 anumbered access listto a single outbound interface. This access list can contain no more thanthreestatements that meet these requirements.

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

u2711 All passwords have been temporarily set to u201cciscou201d.

u2711 The Core connection uses an IP address of 198.18.132.65.

u2711 The computers in the Hosts LAN have been assigned addresses of 192.168.201.1

u2013 192.168.201.254.

u2711 host A 192.168.201.1

u2711 host B 192.168.201.2

u2711 host C 192.168.201.3

u2711 host D 192.168.201.4

u2711 The Finance Web Server has been assigned an address of 172.22.237.17.

u2711 The Public Web Server in the Server LAN has been assigned an address of 172.22.237.18.

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 u201cshow ip interface briefu201d command:

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 u2013 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:

u2711 Other types of access from host B to the Finance Web Server should be blocked.

u2711 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 canu2019t 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: 19

A network administrator creates a layer 3 EtherChannel, bundling four interfaces into channel group 1. On what interface is the IP address configured?

A. the port-channel 1 interface

B. the highest number member interface

C. all member interfaces

D. the lowest number member interface

Answer: A

Explanation:

To create an EtherChannel interface and assign its IP address and subnet mask, use the following steps beginning in global configuration mode:

Command Purpose Step 1

Router(config)#interface port-channelchannel-number

Router(config-if)#

Creates the EtherChannel interface. You can configure up to 16 FECs and 1 GEC on the Catalyst 2948G-L3 and up to 4 GECs on the Catalyst 4908G-L3.

Step 2

Router(config-if)#ip addressip-address subnet-mask

Assigns an IP address and subnet mask to the EtherChannel interface.

Step 3 Router(config-if)#exit Router(config)#

Exits this mode. Optionally, you can remain in interface configuration mode and enable other supported interface commands to meet

The IP address is assigned to the port channel interface, not the underlying physical member interfaces.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2948gand4908g/12-0_7_w5_15d/configuration/guide/config/ether_ch.html


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