CISCO CCNA Exam – Q18

Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An 802.1Q trunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 the native VLAN is not specified.
What will happen in this scenario?

A. 802.1Q giants frames could saturate the link.
B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.
C. A native VLAN mismatch error message will appear.
D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.

Correct Answer: C

Explanation:
A “native VLAN mismatch” error will appear by CDP if there is a native VLAN mismatch on an 802.1Q link. “VLAN mismatch” can cause traffic from one vlan to leak into another vlan.

CISCO CCNA Exam – Q17

Refer to the exhibit.

CISCO CCNA Exam – Q17

A network technician is asked to design a small network with redundancy. The exhibit represents this design, with all hosts configured in the same VLAN. What conclusions can be made about this design?

A. This design will function as intended.
B. Spanning-tree will need to be used.
C. The router will not accept the addressing scheme.
D. The connection between switches should be a trunk.
E. The router interfaces must be encapsulated with the 802.1Q protocol.

Correct Answer: C

Explanation:
Each interface on a router must be in a different network. If two interfaces are in the same network, the router will not accept it and show error when the administrator assigns it.

CISCO CCNA Exam – Q16

Refer to the exhibit.

CISCO CCNA Exam – Q16

A technician is troubleshooting host connectivity issues on the switches. The hosts in VLANs 10 and 15 on Sw11 are unable to communicate with hosts in the same VLANs on Sw12. Hosts in the Admin VLAN are able to communicate. The port-to-VLAN assignments are identical on the two switches. What could be the problem?

A. The Fa0/1 port is not operational on one of the switches.
B. The link connecting the switches has not been configured as a trunk.
C. At least one port needs to be configured in VLAN 1 for VLANs 10 and 15 to be able to communicate.
D. Port FastEthernet 0/1 needs to be configured as an access link on both switches.
E. A router is required for hosts on SW11 in VLANs 10 and 15 to communicate with hosts in the same VLAN on Sw12.

Correct Answer: B

Explanation:
In order for hosts in the same VLAN to communicate with each other over multiple switches, those switches need to be configured as trunks on their connected interfaces so that they can pass traffic from multiple VLANs.

CISCO CCNA Exam – Q15

Refer to the exhibit.

CISCO CCNA Exam – Q15
Given this output for Switch C, what should the network administrator’s next action be?

A. Check the trunk encapsulation mode for Switch C’s fa0/1 port.
B. Check the duplex mode for Switch C’s fa0/1 port.
C. Check the duplex mode for Switch A’s fa0/2 port.
D. Check the trunk encapsulation mode for Switch A’s fa0/2 port.

Correct Answer: C

Explanation:
Here we can see that this port is configured for full duplex, so the next step would be to check the duplex setting of the port on the other switch. A mismatched trunk encapsulation would not result in input errors and CRC errors.

CISCO CCNA Exam – Q14

Refer to the exhibit.
CISCO CCNA Exam – Q14

A network administrator is configuring an EtherChannel between SW1 and SW2. The SW1 configuration is shown. What is the correct configuration for SW2?

A.
interface FastEthernet 0/1
channel-group 1 mode active
switchport trunk encapsulation dot1q
switchport mode trunk
interface FastEthernet 0/2
channel-group 1 mode active
switchport trunk encapsulation dot1q
switchport mode trunk
B.
interface FastEthernet 0/1
channel-group 2 mode auto
switchport trunk encapsulation dot1q
switchport mode trunk
interface FastEthernet 0/2
channel-group 2 mode auto
switchport trunk encapsulation dot1q
switchport mode trunk
C.
interface FastEthernet 0/1
channel-group 1 mode desirable
switchport trunk encapsulation dot1q
switchport mode trunk
interface FastEthernet 0/2
channel-group 1 mode desirable
switchport trunk encapsulation dot1q
switchport mode trunk
D.
interface FastEthernet 0/1
channel-group 1 mode passive
switchport trunk encapsulation dot1q
switchport mode trunk
interface FastEthernet 0/2
channel-group 1 mode passive
switchport trunk encapsulation dot1q
switchport mode trunk

Correct Answer: C

Explanation:
If the EtherChannel was configured with mode “auto”, it was using PAgP, so, we need to configure the other switch with “desirable” mode.
PAgP modes: auto | Desirable
LACP modes: active | pasive

CISCO CCNA Exam – Q12

Refer to the exhibit.
CISCO CCNA Exam – Q12
What set of commands was configured on interface Fa0/3 to produce the given output?

A.
interface FastEthernet 0/3
channel-group 1 mode desirable
switchport trunk encapsulation dot1q
switchport mode trunk
B.
interface FastEthernet 0/3
channel-group 2 mode passive
switchport trunk encapsulation dot1q
switchport mode trunk
C.
interface FastEthernet 0/3
channel-group 2 mode active
switchport trunk encapsulation dot1q
switchport mode trunk
D.
interface FastEthernet 0/3
channel-group 2 mode on
switchport trunk encapsulation dot1q
switchport mode trunk

Correct Answer: B

Explanation:
Based on the output shown, the configured channel group number was 2 and the mode used was passive, so only choice B is correct.

CISCO CCNA Exam – Q11

You are working in a data center environment and are assigned the address range 10.188.31.0/23. You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each. Which IP address range meets these requirements?

A. 10.188.31.0/26
B. 10.188.31.0/25
C. 10.188.31.0/28
D. 10.188.31.0/27
E. 10.188.31.0/29

Correct Answer: D

Explanation:
Each subnet has 30 hosts < 32 = 25 so we need a subnet mask which has at least 5 bit 0s -> /27. Also the question requires the maximum number of subnets (which minimum the number of hosts-per-subnet) so /27 is the best choice.

CISCO CCNA Exam – Q10

What are three features of the IPv6 protocol? (Choose three.)

A. optional IPsec
B. autoconfiguration
C. no broadcasts
D. complicated header
E. plug-and-play
F. checksums

Correct Answers: B,C,E

Explanation:
An important feature of IPv6 is that it allows plug and play option to the network devices by allowing them to configure themselves independently. It is possible to plug a node into an IPv6 network without requiring any human intervention. This feature is critical to allow network connectivity to an increasing number of mobile devices. This is accomplished by autoconfiguration.

IPv6 does not implement traditional IP broadcast, i.e. the transmission of a packet to all hosts on the attached link using a special broadcast address, and therefore does not define broadcast addresses. In IPv6, the same result can be achieved by sending a packet to the link-local all nodes multicast group at address ff02::1, which is analogous to IPv4 multicast to address 224.0.0.1.

CISCO CCNA Exam – Q9

Which command enables IPv6 forwarding on a Cisco router?

A. ipv6 local
B. ipv6 host
C. ipv6 unicast-routing
D. ipv6 neighbor

Correct Answer: C. ipv6 unicast-routing

Explanation:
To enable IPv6 routing on the Cisco router use the following command:
ipv6 unicast-routing
If this command is not recognized, your version of IOS does not support IPv6.