Quick Guide: ccna 200 125 pdf

200-125 Guide

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  • Cisco
  • Exam Number/Code 200-125
  • Product Name CCNA Cisco Certified Network Associate CCNA (v3.0)
  • Questions and Answers
  • 635 Q&As
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Quick Guide: ccna 200 125 pdf

Exam Code: cisco ccna 200 125 (Practice Exam Latest Test Questions VCE PDF)
Exam Name: CCNA Cisco Certified Network Associate CCNA (v3.0)
Certification Provider: Cisco
Free Today! Guaranteed Training- Pass ccna routing and switching 200 125 official cert guide library Exam.

Q121.  - (Topic 8)

Which command can you enter to route all traffic that is destined for 192.168.0.0/20 to a specific interface?

A. router(config)#ip route 192.168.0.0 255.255.240.0 GigabitEthernet0/1

B. router(config)#ip route 0.0.0.0 255.255.255.0 GigabitEthernet0/1

C. router(config)#ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1

D. router(config)#ip route 192.168.0.0 255.255.255.0 GigabitEthernet0/1

Answer: A


Q122.  - (Topic 5)

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

Answer: A

Explanation:

In IPv6 the loopback address is written as, ::1

This is a 128bit number, with the first 127 bits being '0' and the 128th bit being '1'. It's just a single address, so could also be written as ::1/128.


Q123.  - (Topic 5)

Refer to the exhibit.

Which address range efficiently summarizes the routing table of the addresses for router Main?

A. 172.16.0.0./21

B. 172.16.0.0./20

C. 172.16.0.0./16

D. 172.16.0.0/18

Answer: B

Explanation:

The 172.16.0.0./20 network is the best option as it includes all networks from 172.16.0.0 –

172.16.16.0 and does it more efficiently than the /16 and /18 subnets. The /21 subnet will not include all the other subnets in this one single summarized address.


Q124.  - (Topic 8)

Which two statements about northbound and southbound APIs are true? (Choose two.)

A. Only southbound APIs allow program control of the network.

B. Only northbound APIs allow program control of the network.

C. Only southbound API interfaces use a Service Abstraction Layer.

D. Only northbound API interfaces use a Service Abstraction Layer.

E. Both northbound and southbound API interfaces use a Service Abstraction Layer.

F. Both northbound and southbound APIs allow program control of the network.

Answer: B,C


Q125.  - (Topic 8)

Which feature can you use to monitor traffic on a switch by replicating it to another port or ports on the same switch?

A. copy run start

B. traceroute

C. the ICMP Echo IP SLA

D. SPAN

Answer: D

Explanation: A source port, also called a monitored port, is a switched or routed port that you monitor for network traffic analysis. In a single local SPAN session or RSPAN source session, you can monitor source port traffic, such as received (Rx), transmitted (Tx), or bidirectional (both). The switch supports any number of source ports (up to the maximum

number of available ports on the switch) and any number of source VLANs. A source port has these characteristics:

✑ It can be any port type, such as EtherChannel, Fast Ethernet, Gigabit Ethernet,

and so forth.

✑ It can be monitored in multiple SPAN sessions.

✑ It cannot be a destination port.

✑ Each source port can be configured with a direction (ingress, egress, or both) to monitor. For EtherChannel sources, the monitored direction applies to all physical ports in the group.

✑ Source ports can be in the same or different VLANs.

✑ For VLAN SPAN sources, all active ports in the source VLAN are included as source ports.


Q126.  - (Topic 5)

What are two benefits of using NAT? (Choose two.)

A. NAT facilitates end-to-end communication when IPsec is enabled.

B. NAT eliminates the need to re-address all hosts that require external access.

C. NAT conserves addresses through host MAC-level multiplexing.

D. Dynamic NAT facilitates connections from the outside of the network.

E. NAT accelerates the routing process because no modifications are made on the packets.

F. NAT protects network security because private networks are not advertised.

Answer: B,F

Explanation:

By not revealing the internal IP addresses, NAT adds some security to the inside network -

> F is correct.

NAT has to modify the source IP addresses in the packets -> E is not correct.

Connection from the outside of the network through a “NAT” network is more difficult than a more network because IP addresses of inside hosts are hidden -> C is not correct.

In order for IPsec to work with NAT we need to allow additional protocols, including Internet Key Exchange (IKE), Encapsulating Security Payload (ESP) and Authentication Header (AH) -> more complex -> A is not correct.

By allocating specific public IP addresses to inside hosts, NAT eliminates the need to re- address the inside hosts -> B is correct.

NAT does conserve addresses but not through host MAC-level multiplexing. It conserves addresses by allowing many private IP addresses to use the same public IP address to go to the Internet -> C is not correct.


Q127.  - (Topic 7)

In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

A. during high traffic periods

B. after broken links are re-established

C. when upper-layer protocols require high reliability

D. in an improperly implemented redundant topology

E. when a dual ring topology is in use

Answer: D

Explanation:

If we connect two switches via 2 or more links and do not enable STP on these switches then a loop (which creates multiple copies of the same unicast frame) will occur. It is an example of an improperly implemented redundant topology.


Q128. CORRECT TEXT - (Topic 7)

The following have already been configured on the router:

✑ The basic router configuration

✑ The appropriate interfaces have been configured for NAT inside and NAT outside.

✑ The appropriate static routes have also been configured (since the company will be a stub network, no routing protocol will be required)

✑ All passwords have been temporarily set to “cisco”.

The task is to complete the NAT configuration using all IP addresses assigned by the ISP to provide Internet access for the hosts in the Weaver LAN. Functionality can be tested by clicking on the host provided for testing.

Configuration information:

router name – Weaver

inside global addresses – 198.18.184.105 - 198.18.184.110/29 inside local addresses - 192.168.100.17 – 192.168.100.30/28 number of inside hosts – 14

A network associate is configuring a router for the weaver company to provide internet access. The ISP has provided the company six public IP addresses of 198.18.184.105 198.18.184.110. The company has 14 hosts that need to access the internet simultaneously. The hosts in the company LAN have been assigned private space addresses in the range of 192.168.100.17 – 192.168.100.30.

Answer: 

The company has 14 hosts that need to access the internet simultaneously but we just have 6 public IP addresses from 198.18.184.105 to 198.18.184.110/29. Therefore we have to use NAT overload (or PAT)

Double click on the Weaver router to open it

Router>enable Router#configure terminal

First you should change the router's name to Weaver

Router(config)#hostname Weaver

Create a NAT pool of global addresses to be allocated with their netmask. Weaver(config)#ip nat pool mypool 198.18.184.105 198.18.184.110 netmask 255.255.255.248

Create a standard access control list that permits the addresses that are to be translated.

Weaver(config)#access-list 1 permit 192.168.100.16 0.0.0.15

Establish dynamic source translation, specifying the access list that was defined in the prior step.

Weaver(config)#ip nat inside source list 1 pool mypool overload

This command translates all source addresses that pass access list 1, which means a source address from 192.168.100.17 to 192.168.100.30, into an address from the pool named mypool (the pool contains addresses from 198.18.184.105 to 198.18.184.110). Overload keyword allows to map multiple IP addresses to a single registered IP address (many-to-one) by using different ports.

The question said that appropriate interfaces have been configured for NAT inside and NAT outside statements.

This is how to configure the NAT inside and NAT outside, just for your understanding:

Weaver(config)#interface fa0/0 Weaver(config-if)#ip nat inside Weaver(config-if)#exit Weaver(config)#interface s0/0 Weaver(config-if)#ip nat outside Weaver(config-if)#end

Finally, we should save all your work with the following command:

Weaver#copy running-config startup-config

Check your configuration by going to "Host for testing" and type:

C :\\>ping 192.0.2.114

The ping should work well and you will be replied from 192.0.2.114


Q129.  - (Topic 8)

While troubleshooting a connection problem on a computer, you determined that the computer can ping a specific web server but it cannot connect to TCP port 80 on that server. Which reason for the problem is most likely true?

A. A VLAN number is incorrect.

B. A Route is missing

C. An ARP table entry is missing.

D. An ACL is blocking the TCP port.

Answer: D


Q130.  - (Topic 8)

Which switching method duplicates the first six bytes of a frame before making a switching decision?

A. fragment-free switching

B. store and-forward switching

C. cut through switching

D. ASIC switching

Answer: C

Explanation: Cut and Through method has lowest latency. In this method Switch only read first six bytes from frame after the preamble. These six bytes are the destination address of frame. This is the fastest method of switching. This method also processes invalid frames. Only advantage of this method is speed.


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