CCIE Routing and Switching Written Exam v5.1

 

QUESTION 221

Refer to the exhibit. If ISIS is configured utilizing default metrics, what is the cost for Router 4 to reach the 10.2.2.0/24 network?

 

clip_image002

A.

1

B.

20

C.

30

D.

63

 

Correct Answer: C

Explanation:

By default,
every link is an IS-IS network has a metric of 10.

 

 

QUESTION 222

DRAG DROP

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Correct Answer:

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QUESTION 223

Which two services are used to transport Layer 2 frames across a packet-switched network? (Choose two.)

 

A.

Frame Relay

B.

ATM

C.

AToM

D.

L2TPv3

 

Correct Answer: CD

Explanation:

Both AToM and L2TPv3 have the common objective of transmitting packet switched traffic of L2 frames (Frame Relay, ATM, and Ethernet) across a packet-switched network.

Reference: Layer 2 VPN Architectures – Google Books Result Wei Luo, Carlos Pignataro, Anthony Chan

https://books.google.com/books?isbn=0132796864

 

 

QUESTION 224

Which three statements are true about VSS? (Choose three.)

 

A.

VSS separates the control planes of the active and the standby chassis.

B.

Configuration changes can be made on both active and standby chassis.

C.

When the VSS active chassis recovers after a failure, it initiates a switchover and takes on the active role again.

D.

VSS unifies the control planes of the active and the standby chassis.

E.

HSRP configuration is not required to run VSS.

F.

The VSS standby chassis monitors the VSS active chassis using the VSL.

 

Correct Answer: DEF

Explanation:

VSS operates on a unified control plane with a distributed forwarding architecture in which the active supervisor (or switch) is responsible for actively participating with the rest of the network and for managing and maintaining control plane information. VSS actually removes the need for a next-hop redundancy protocol like HSRP or VRRP. These first-hop redundancy protocols are usually heavily tied to a fast-converging routing protocol like EIGRP, and still require that each device maintain it’s own control plane. The standby chassis monitors the active chassis using the VSL. If it detects failure, the standby chassis initiates a switchover and takes on the active role. When the failed chassis recovers, it takes on the standby role.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-1SY/config_guide/sup2T/15_1_sy_swcg_2T/virtual_switching_systems.pdf

 

 

QUESTION 225

Which statement describes the difference between a stub area and a totally stub area?

 

A.

The ABR advertises a default route to a totally stub area and not to a stub area.

B.

Stub areas do not allow LSA types 4 and 5, while totally stub areas do not allow LSA types 3, 4, and 5.

C.

Totally stub areas allow limited external routes in the area via a special type 7 LSA, while stub areas do not

D.

Stub areas do not allow external LSAs, ASBR summary LSAs, or summary LSAs with the exception of a default route originated by the ABR via a summary LSA.

 

Correct Answer: B

Explanation:

Standard areas can contain LSAs of type 1, 2, 3, 4, and 5, and may contain an ASBR. The backbone is considered a standard area.

Stub areas can contain type 1, 2, and 3 LSAs. A default route is substituted for external routes.

Totally stubby areas can only contain type 1 and 2 LSAs, and a single type 3 LSA. The type 3 LSA describes a default route, substituted for all external and inter-area routes.

Not-so-stubby areas implement stub or totally stubby functionality yet contain an ASBR. Type 7 LSAs generated by the ASBR are converted to type 5 by ABRs to be flooded to the rest of the OSPF domain.

 

Reference: http://packetlife.net/blog/2008/jun/24/ospf-area-types/

 

 

QUESTION 226

DRAG DROP

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Correct Answer:

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QUESTION 227

Refer to the exhibit. With these configurations for R1 and R2, which statement about PPP authentication is true?

 

clip_image012

 

A.

Authentication fails because R1 is missing a username and password.

B.

R2 responds with the correct authentication credentials.

C.

R2 requires authentication from R1.

D.

R1 requires authentication from R2.

Correct Answer: C

Explanation:

Only R2 is configured with the “PPP authentication PAP” command so it requires authentication from R1, but R1 does not require authentication from R2.

 

 

QUESTION 228

On an MPLS L3VPN, which two tasks are performed by the PE router? (Choose two.)


 

A.

It exchanges VPNv4 routes with other PE routers.

B.

It typically exchanges iBGP routing updates with the CE device.

C.

It distributes labels and forwards labeled packets.

D.

It exchanges VPNv4 routes with CE devices.

E.

It forwards labeled packets between CE devices.

 

Correct Answer: AC

Explanation:

MPLS VPN functionality is enabled at the edge of an MPLS network. The PE router performs these tasks:

 

clip_image014Exchanges routing updates with the CE router

clip_image014[1]Translates the CE routing information into VPN version 4 (VPNv4) routes

clip_image014[2]Exchanges VPNv4 routes with other PE routers through the Multiprotocol Border Gateway Protocol (MP-BGP)

 

A PE router binds a label to each customer prefix learned from a CE router and includes the label in the network reachability information for the prefix that it advertises to other PE routers. When a PE router forwards a packet received from a CE router across the provider network, it labels the packet with the label learned from the destination PE router. When the destination PE router receives the labeled packet, it pops the label and uses it to direct the packet to the correct CE router. Label forwarding across the provider backbone is based on either dynamic label switching or traffic engineered paths. A customer data packet carries two levels of labels when traversing the backbone.

Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-2/lxvpn/configuration/guide/vcasr9kv342/vcasr9k42v3.html

 

 

QUESTION 229

DRAG DROP

clip_image016

 

Correct Answer:

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QUESTION 230

Which three statements are true about an EtherChannel? (Choose three.)

 

A.

PAGP and LACP can be configured on the same switch if the switch is not in the same EtherChannel.

B.

EtherChannel ports in suspended state can receive BPDUs but cannot send them.

C.

An EtherChannel forms between trunks that are using different native VLANs.

D.

LACP can operate in both half duplex and full duplex, if the duplex setting is the same on both ends.

E.

Ports with different spanning-tree path costs can form an EtherChannel.

 

Correct Answer: ABE

Explanation:

Answer A: EtherChannel groups running PAgP and LACP can coexist on the same switch or on different switches in the stack. Individual EtherChannel groups can run either PAgP or LACP, but they cannot interoperate.

 

Answer B:

EtherChannel Member Port States

Port States

Description

bundled

The port is part of an EtherChannel and can send and receive BPDUs and data traffic.

suspended

The port is not part of an EtherChannel. The port can receive BPDUs but cannot send them. Data traffic is blocked.

standalone

The port is not bundled in an EtherChannel. The port functions as a standalone data port. The port can send and receive BPDUs and data traffic.

 

Answer E: Ports with different spanning-tree path costs can form an EtherChannel if they are otherwise compatibly configured. Setting different spanning-tree path costs does not, by itself, make ports incompatible for the formation of an EtherChannel.

 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-0_2_EX/layer2/configuration_guide/b_lay2_152ex_2960-x_cg/b_lay2_152ex_2960- x_cg_chapter_010.html

 

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