200-125 | Breathing CCNA Routing and Switching 200-125 vce

Q1. Which MTU size can cause a baby giant error?

A. 1500

B. 9216

C. 1600

D. 1518

Answer: C

Explanation: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html

Q2. Which two commands can you enter to verify that a configured NetFlow data export is operational? (Choose two.)

A. show ip flow export

B. show ip cache flow

C. ip flow ingress

D. ip flow egress

E. interface ethernet 0/0

F. ip flow-export destination

Answer: A,B

Q3. R1#show running-config interface Loopback0

description ***Loopback***

ip address 192.168.1.1 255.255.255.255

ip ospf 1 area 0

!

interface Ethernet0/0

description **Connected to R1-LAN** ip address 10.10.110.1 255.255.255.0

ip ospf 1 area 0

!

interface Ethernet0/1

description **Connected to L2SW**

ip address 10.10.230.1 255.255.255.0

ip ospf hello-interval 25 ip ospf 1 area 0

!

router ospf 1

log-adjacency-changes

R2# show running-config R2

!

interface Loopback0 description **Loopback**

ip address 192.168.2.2 255.255.255.255

ip ospf 2 area 0

!

interface Ethernet0/0

description **Connected to R2-LAN** ip address 10.10.120.1 255.255.255.0

ip ospf 2 area 0

!

interface Ethernet0/1

description **Connected to L2SW**

ip address 10.10.230.2 255.255.255.0

ip ospf 2 area 0

!

router ospf 2

log-adjacency-changes

R3#show running-config R3

username R6 password CISCO36

!

interface Loopback0 description **Loopback**

ip address 192.168.3.3 255.255.255.255

ip ospf 3 area 0

!

interface Ethernet0/0

description **Connected to L2SW**

ip address 10.10.230.3 255.255.255.0

ip ospf 3 area 0

!

interface Serial1/0

description **Connected to R4-Branch1 office** ip address 10.10.240.1 255.255.255.252

encapsulation ppp ip ospf 3 area 0

!

interface Serial1/1

description **Connected to R5-Branch2 office** ip address 10.10.240.5 255.255.255.252

encapsulation ppp

ip ospf hello-interval 50 ip ospf 3 area 0

!

interface Serial1/2

description **Connected to R6-Branch3 office** ip address 10.10.240.9 255.255.255.252

encapsulation ppp ip ospf 3 area 0

ppp authentication chap

!

router ospf 3

router-id 192.168.3.3

!

R4#show running-config

R4

!

interface Loopback0 description **Loopback**

ip address 192.168.4.4 255.255.255.255

ip ospf 4 area 2

!

interface Ethernet0/0

ip address 172.16.113.1 255.255.255.0

ip ospf 4 area 2

!

interface Serial1/0

description **Connected to R3-Main Branch office** ip address 10.10.240.2 255.255.255.252

encapsulation ppp ip ospf 4 area 2

!

router ospf 4

log-adjacency-changes

R5#show running-config R5

!

interface Loopback0 description **Loopback**

ip address 192.168.5.5 255.255.255.255

ip ospf 5 area 0

!

interface Ethernet0/0

ip address 172.16.114.1 255.255.255.0

ip ospf 5 area 0

!

interface Serial1/0

description **Connected to R3-Main Branch office**

ip address 10.10.240.6 255.255.255.252

encapsulation ppp ip ospf 5 area 0

!

router ospf 5

log-adjacency-changes

R6#show running-config R6

username R3 password CISCO36

!

interface Loopback0 description **Loopback**

ip address 192.168.6.6 255.255.255.255

ip ospf 6 area 0

!

interface Ethernet0/0

ip address 172.16.115.1 255.255.255.0

ip ospf 6 area 0

!

interface Serial1/0

description **Connected to R3-Main Branch office** ip address 10.10.240.10 255.255.255.252

encapsulation ppp ip ospf 6 area 0

ppp authentication chap

!

router ospf 6

router-id 192.168.3.3

!

An OSPF neighbor adjacency is not formed between R3 in the main office and R6 in the Branch3 office. What is causing the problem?

A. There is an area ID mismatch.

B. There is a PPP authentication issue; the username is not configured on R3 and R6.

C. There is an OSPF hello and dead interval mismatch.

D. The R3 router ID is configured on R6.

Answer: D

Q4. Which two statements about late collisions are true? (Choose two.)

A. They may indicate a duplex mismatch.

B. By definition, they occur after the 512th bit of the frame has been transmitted.

C. They indicate received frames that did not pass the FCS match.

D. They are frames that exceed 1518 bytes.

E. They occur when CRC errors and interference occur on the cable.

Answer: A,B

Q5. When troubleshooting client DNS issues, which two tasks must you perform? (Choose two.)

A. Ping a public website IP address.

B. Determine whether a DHCP address has been assigned.

C. Determine whether the hardware address is correct.

D. Ping the DNS server.

E. Determine whether the name servers have been configured.

Answer: D,E

Q6. Which protocol authenticates connected devices before allowing them to access the LAN?

A. 802.1d

B. 802.11

C. 802.1w

D. 802.1x

Answer: D

Explanation:

802.1X authentication involves three parties: a supplicant, an authenticator, and an authentication server. Thesupplicantis 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 authenticatoris a network device, such as an Ethernet switch or wireless access point; and theauthentication serveris 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 supplicantu2021s 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.

Q7. Which effect of the passive-Interface command on R1 is true?

A. It removes the 172.16.0.0 network from all updates on all interfaces on R1.

B. It prevents interface Fa0/0 from sending updates.

C. Interface Fa0/0 operates in RIPv1 mode.

D. It removes the 172.17.0.0 network from all updates on all interfaces on R1.

Answer: B

Q8. Which NAT type is used to translate a single inside address to a single outside address?

A. dynamic NAT

B. NAT overload

C. PAT

D. static NAT

Answer: D

Explanation:

Network address translation (NAT) is the process ofmodifying IP addressinformation in IP packet headers while in transit across a traffic routing device.

There are two different types of NAT:

u2711 NAT

u2711 PAT

Q9. If all OSPF routers in a single area are configured with the same priority value, what value does a router use for the OSPF router ID in the absence of a loopback interface?

A. the IP address of the first Fast Ethernet interface

B. the IP address of the console management interface

C. the highest IP address among its active interfaces

D. the lowest IP address among its active interfaces

E. the priority value until a loopback interface is configured

Answer: C

Explanation: Ordinarily the loopback interface would be selected as the router ID. In the event that no loopback interface is configured, the router ID will be the first active interface that comes up on the router. If that particular interface has more then one IP address, then the highest address will be selected as the Router ID.

Q10. Which statement about the inside interface configuration in a NAT deployment is true?

A. It is defined globally

B. It identifies the location of source addresses for outgoing packets to be translated using access or route maps.

C. It must be configured if static NAT is used

D. It identifies the public IP address that traffic will use to reach the internet.

Answer: B

Explanation:

This module describes how to configure Network Address Translation (NAT) for IP address conservation and how to configure inside and outside source addresses. This module also provides information about the benefits of configuring NAT for IP address conservation. NAT enables private IP internetworks that use nonregistered IP addresses to connect to the Internet. NAT operates on a device, usually connecting two networks, and translates the private (not globally unique) addresses in the internal network into legal addresses before packets are forwarded onto another network. NAT can be configured to advertise to the outside world only one address for the entire network. This ability provides additional security by effectively hiding the entire internal network behind that one address.

NAT is also used at the enterprise edge to allow internal users access to the Internet and to allow Internet access to internal devices such as mail servers.