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CertBus 2020 Latest Cisco 200-125 CCNA Routing and Switching Exam VCE and PDF Dumps for Free Download!

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Question 1:

Which command can you enter to view the ports that are assigned to VLAN 20?

A. Switch#show vlan id 20

B. Switch#show ip interface brief

C. Switch#show interface vlan 20

D. Switch#show ip interface vlan 20

Correct Answer: A

Explanation


Question 2:

Which protocol authenticates connected devices before allowing them to access the LAN?

A. 802.1d

B. 802.11

C. 802.1w

D. 802.1x

Correct Answer: D

Explanation

802.1X authentication involves three parties: a supplicant, an authenticator, and an authentication server. The supplicant is a client device (such as a laptop) that wishes to attach to the LAN/WLAN. The term \’supplicant\’ is also used interchangeably to refer to the software running on the client that provides credentials to the authenticator. The authenticator is a network device, such as an Ethernet switch or wireless access point; and the authentication server is typically a host running software supporting the RADIUS and EAP protocols. The authenticator acts like a security guard to a protected network. The supplicant (i.e., client device) is not allowed access through the authenticator to the protected side of the network until the supplicant\’s identity has been validated and authorized. An analogy to this is providing a valid visa at the airport\’s arrival immigration before being allowed to enter the country. With 802.1X port-based authentication, the supplicant provides credentials, such as user name/password or digital certificate, to the authenticator, and the authenticator forwards the credentials to the authentication server for verification. If the authentication server determines the credentials are valid, the supplicant (client device) is allowed to access resources located on the protected side of the network.


Question 3:

What is a difference between TACACS and RADIUS in AAA?

A. Only TACACS allows for separate authentication.

B. Only RADIUS encrypts the entire access-request packet.

C. Only RADIUS uses TCP.

D. Only TACACS couples authentication and authorization.

Correct Answer: A

Explanation

Explanation: Authentication and Authorization

RADIUS combines authentication and authorization. The access-accept packets sent by the RADIUS server to the client contain authorization information. This makes it difficult to decouple authentication and authorization.

TACACS uses the AAA architecture, which separates AAA. This allows separate authentication solutions that can still use TACACS for authorization and accounting. For example, with TACACS , it is possible to use Kerberos

authentication and TACACS authorization and accounting. After a NAS authenticates on a Kerberos server, it requests authorization information from a TACACS server without having to re-authenticate. The NAS informs the TACACS

server that it has successfully authenticated on a Kerberos server, and the server then provides authorization information. During a session, if additional authorization checking is needed, the access server checks with a TACACS server to

determine if the user is granted permission to use a particular command. This provides greater control over the commands that can be executed on the access server while decoupling from the authentication mechanism.


Question 4:

Which IPv6 address is valid?

A. 2001:0db8:0000:130F:0000:0000:08GC:140B

B. 2001:0db8:0:130H::87C:140B

C. 2031::130F::9C0:876A:130B

D. 2031:0:130F::9C0:876A:130B

Correct Answer: D

Explanation

An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits (two octets). The groups are separated by colons (:). An example of an IPv6 address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334. The leading 0\’s in a group can be collapsed using ::, but this can only be done once in an IP address.


Question 5:

Which two commands can be used to verify a trunk link configuration status on a given cisco switch? (choose two)

A. show interfaces interface

B. show interfaces trunk

C. show interfaces switch port

D. show ip interface brief

E. show interfaces vlan

Correct Answer: BC


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Question 6:

If you are configuring syslog messages specifying `logging trap warning\’, which log messages will the router send?

A. 0-4

B. 0-5

C. 0-6

D. 0-2

E. 0-1

Correct Answer: A


Question 7:

Which command can you enter to configure an IPV6 floating static route?

A. Router(config)# ipv6 route FE80:0202::/32 serail 0/1 201

B. Router(config)# ipv6 route::/0 serail0/1

C. Router(config)# ipv6 route static resolve default

D. Router(config)# ipv6 route FE80:0202::/32 serail 0/1 1

Correct Answer: A


Question 8:

What is true about Ethernet? (Choose Two.)

A. 802.2 Protocol

B. 802.3 Protocol

C. 10BaseT half duplex

D. CSMA/CD Stops transmitting when congestion occurs

E. CSMA/CA Stops transmitting when congestion occurs

Correct Answer: BD


Question 9:

How to configure RIPv2? (Choose Two.)

A. Enable RIP

B. Connect RIP to WAN interface

C. Enable no auto-summary

D. Enable authentication

Correct Answer: AC


Question 10:

What is the status of port-channel if LACP is misconfigured?

A. Forwarding

B. Enabled

C. Disabled

D. Err disabled

Correct Answer: D


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