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New Cisco 200-125 Exam Dumps Collection (Question 7 - Question 16)

New Questions 7

What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)

A. It requires the use of ARP.

B. It can support multiple IPv6 subnets on a single link.

C. It supports up to 2 instances of OSPFv3 over a common link.

D. It routes over links rather than over networks.

Answer: B,D

Explanation:

Here is a list of the differences between OSPFv2 and OSPFv3:

u2711 They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols

u2711 OSPFv3 introduces new LSA types

u2711 OSPFv3 has different packet format

u2711 OSPFv3 uses different flooding scope bits (U/S2/S1)

u2711 OSPFv3 adjacencies are formed over link-local IPv6 communications

u2711 OSPFv3 runs per-link rather than per-subnet

u2711 OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses

u2711 OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs)

u2711 OSPFv3 Neighbor Authentication done with IPsec (AH)

u2711 OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number

Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and- ipv6.html

New Questions 8

Which three of these statements regarding 802.1Q trunking are correct? (Choose three.)

A. 802.1Q native VLAN frames are untagged by default.

B. 802.1Q trunking ports can also be secure ports.

C. 802.1Q trunks can use 10 Mb/s Ethernet interfaces.

D. 802.1Q trunks require full-duplex, point-to-point connectivity.

E. 802.1Q trunks should have native VLANs that are the same at both ends.

Answer: A,C,E

Explanation:

By default, 802.1Q trunk defined Native VLAN in order to forward unmarked frame. Switches can forward Layer 2 frame from Native VLAN on unmarked trunks port. Receiver

switches will transmit all unmarked packets to Native VLAN. Native VLAN is the default VLAN configuration of port. Note for the 802.1Q trunk ports between two devices, the same Native VLAN configuration is required on both sides of the link. If the Native VLAN in 802.1Q trunk ports on same trunk link is properly configured, it could lead to layer 2 loops. The 802.1Q trunk link transmits VLAN information through Ethernet.

New Questions 9

What is the alternative notation for the IPv6 address B514:82C3:0000:0000:0029:EC7A:0000:EC72?

A. B514 : 82C3 : 0029 : EC7A : EC72

B. B514 : 82C3 :: 0029 : EC7A : EC72

C. B514 : 82C3 : 0029 :: EC7A : 0000 : EC72

D. B514 : 82C3 :: 0029 : EC7A : 0 : EC72

Answer: D

Explanation:

There are two ways that an IPv6 address can be additionally compressed: compressing leading zeros and substituting a group of consecutive zeros with a single double colon (::). Both of these can be used in any number of combinations to notate the same address. It is important to note that the double colon (::) can only be used once within a single IPv6 address notation. So, the extra 0u2021s can only be compressed once.

New Questions 10

What are the possible trunking modes for a switch port? (Choose three.)

A. transparent

B. auto

C. on

D. desirable

E. client

F. forwarding

Answer: B,C,D

Explanation:

These are the different types of trunk modes:

u2711 ON: This mode puts the port into permanent trunk mode and negotiates to convert the link into a trunk link. The port becomes a trunk port even if the adjacent port does not agree to the change.

u2711 OFF: This mode puts the port into permanent non-trunk mode and negotiates to convert the link into a non-trunk link. The port becomes a non-trunk port even if the adjacent port does not agree to the change.

u2711 Desirable: This mode causes the port to actively attempt to convert the link into a trunk link. The port becomes a trunk port if the adjacent port is set to on, desirable, or auto mode.

u2711 Auto: This mode enables the port to convert the link into a trunk link. The port becomes a trunk port if the adjacent port is set to on or desirable mode. This is the default mode for Fast and Gigabit Ethernet ports.

u2711 Nonegotiate: This mode puts the port into permanent trunk mode, but does not allow the port to generate Dynamic Trunking Protocol (DTP) frames. The adjacent port must be configured manually as a trunk port to establish a trunk link.

New Questions 11

In a switched environment, what does the IEEE 802.1Q standard describe?

A. the operation of VTP

B. a method of VLAN trunking

C. an approach to wireless LAN communication

D. the process for root bridge selection

E. VLAN pruning

Answer: B

Explanation:

A broadcast domain must sometimes exist on more than one switch in the network. To accomplish this, one switch must send frames to another switch and indicate which VLAN a particular frame belongs to. On Cisco switches, a trunk link is created to accomplish this VLAN identification. ISL and IEEE 802.1Q are different methods of putting a VLAN identifier in a Layer 2 frame.

The IEEE 802.1Q protocol interconnects VLANs between multiple switches, routers, and servers. With 802.1Q, a network administrator can define a VLAN topology to span multiple physical devices.

Cisco switches support IEEE 802.1Q for FastEthernet and Gigabit Ethernet interfaces. An 802.1Q trunk link provides VLAN identification by adding a 4-byte tag to an Ethernet Frame as it leaves a trunk port.

New Questions 12

Refer to the exhibit.

A frame on VLAN 1 on switch S1 is sent to switch S2 where the frame is received on VLAN 2. What causes this behavior?

A. trunk mode mismatches

B. allowing only VLAN 2 on the destination

C. native VLAN mismatches

D. VLANs that do not correspond to a unique IP subnet

Answer: C

Explanation:

Untagged frames are encapsulated with the native VLAN. In this case, the native VLANs are different so although S1 will tag it as VLAN 1 it will be received by S2.

New Questions 13

The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command?

A. This command should be executed from the global configuration mode.

B. The IP address 10.121.16.8 is the local router port used to forward data.

C. 102 is the remote DLCI that will receive the information.

D. This command is required for all Frame Relay configurations.

E. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.

Answer: E

Explanation:

Broadcast is added to the configurations of the frame relay, so the PVC supports broadcast, allowing the routing protocol updates that use the broadcast update mechanism to be forwarded across itself.

New Questions 14

What are three advantages of VLANs? (Choose three.)

A. VLANs establish broadcast domains in switched networks.

B. VLANs utilize packet filtering to enhance network security.

C. VLANs provide a method of conserving IP addresses in large networks.

D. VLANs provide a low-latency internetworking alternative to routed networks.

E. VLANs allow access to network services based on department, not physical location.

F. VLANs can greatly simplify adding, moving, or changing hosts on the network.

Answer: A,E,F

Explanation:

VLAN technology is often used in practice, because it can better control layer2 broadcast to improve network security. This makes network more flexible and scalable.

Packet filtering is a function of firewall instead of VLAN.

New Questions 15

What command sequence will configure a router to run OSPF and add network 10.1.1.0/24 to area 0?

A. router ospf area 0

network 10.1.1.0 255.255.255.0 area 0

B. router ospf

network 10.1.1.0 0.0.0.255

C. router ospf 1

network 10.1.1.0 0.0.0.255 area 0

D. router ospf area 0

network 10.1.1.0 0.0.0.255 area 0

E. router ospf

network 10.1.1.0 255.255.255.0 area 0

F. router ospf 1

network 10.1.1.0 0.0.0.255

Answer: C

Explanation:

u2711 Enabling OSPF

SUMMARY STEPS

1.enable 2.configureterminal 3.router ospfprocess-id

4.networkip-addresswildcard-maskareaarea-id 5.end

DETAILED STEPS

Command or Action Purpose

Step 1 Enable

Example:

Device> enable

Enables privileged EXEC mode.

u2711 Enter your password if prompted.

Step 2 Configureterminal

Example:

Device# configure terminal Enters global configuration mode.

Step 3

router ospfprocess-id

Example:

Device(config)# router ospf 109

Enables OSPF routing and enters router configuration mode.

Step 4

Networkip-addresswildcard-maskareaarea-id

Example:

Device(config-router)# network 192.168.129.16 0.0.0.3 area 0

Defines an interface on which OSPF runs and defines the area ID for that interface.

Step 5 End

Example:

Device(config-router)# end

Exits router configuration mode and returns to privileged EXEC mode.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/12-4t/iro-12-4t-book/iro-cfg.html#GUID-588D1301-F63C-4DAC-BF1C-C3735EB13673

New Questions 16

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

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