Ensurepass

QUESTION 201

Which three statements about the Route Distinguisher (RD) are true? (Choose three.)

 

A.

The RD is a BGP extended community.

B.

The RD prefix and a route target make the VPNv4 address unique.

C.

RD, similar to the AS number, is assigned to a service provider by the Internet Assigned Numbers Authority (IANA).

D.

The RD is an 8-byte field.

E.

One customer may use different RDs for the same IPv4 route.

 

Correct Answer: BDE

 

 

QUESTION 202

Which statement about multicast VPN is true?

 

A.

The MDT group address should be the same for both address families in the same VRF.

B.

The MDT group address should be the same for both address families in the different VRFs.

C.

Configuration of the MDT source on a pre-VRF basis is supported only on IPv6.

D.

The MDT group address should be different for both address families in the same VRF.

 

Correct Answer: A

Explanation:

Restrictions for Multicast VPN for Multicast Routing

Configuration of the MDT source on a per-VRF basis is only supported on IPv4.

The MDT group address should be the same for both the address families in the same VRF. Default-MDTs must have the same group address for all VRFs that comprise a MVPN. Data-MDTs may have the same group address if PIM-SSM is used. If PIM-SM is used, they must have a different group address, as providing the same one could result in the PE router receiving unwanted traffic. This is a PIM-SM protocol issue, not an implementation issue.

 

 

QUESTION 203

If the OSPF protocol is used to connect customer edge (CE) routers to service provider edge (PE) routers in the VPN backbone, which two options best describe the use of SHAM links?

 

A.

A sham-link is created between any two VPN sites that belong to the same OSPF area and share an OSPF backdoor link

B.

A sham-link is seen as an intra-area link between PE routers, an OSPF adjacency is created and database is exchanged

C.

A sham-link is created between two directly connected PE routers so that it is preferred over the low speed backdoor door

D.

A sham-l
ink is part of OSPF network of MPLS-VPN provider.

 

Correct Answer: AB

 

 

QUESTION 204

Refer to the exhibit. The exhibit illustrates the exchange of VPN route and label information between MPLS VPN inter-AS. The exhibit also shows ASBRs exchanging VPN-IPv4 addresses. Which command is needed to change the next-hop address when ASBR2 is not configured?

 

clip_image002

 

A.

Redistribute command with the BGP routing process

B.

Redistribute command with connected

C.

Redistribute command with the IGP routing process

D.

Redistribute command with static

 

Correct Answer: B

Explanation:

Figure 11-3 illustrates the exchange of VPN route and label information between autonomous systems. The only difference is that ASBR2 is configured with the redistribute connected command, which propagates the host routes to all PEs. The redistribute connected command is necessary because ASBR2 is not the configured to change the next hop address.

Figure 11-3 Host Routes Propagated to All PEs Between Two Autonomous Systems

 

clip_image004

 

Reference:

http://www.cisco.com/en/US/docs/net_mgmt/ip_solution_center/4.0/mpls/user/guide/11_isc.html

 

 

QUESTION 205

Which three of these are major components of an MPLS VPN network? (Choose three)

 

A.

LDP notification

B.

L2TPv3 session

C.

VPN route target communities

D.

Multiprotocol BGP peering of PE routers

E.

MPLS forwarding

 

Correct Answer: CDE

 

 

QUESTION 206

In the Carrier Supporting Carrier (CsC) feature, which two protocols run between CSC-PE and CSC-CE. (Choose two)

 

A.

IGP and RSVP

B.

EBGPv4 with a sending community

C.

IGP and EBGPv4

D.

IGP and LDP

E.

EBGPv4 with a sending label

 

Correct Answer: DE

 

 

QUESTION 207

Which four statements about the Carrier Supporting Carrier (CSC) feature are true? (Choose four.)

 

A.

MPLS is required between the PE and CE routers that connect the backbone carrier to the customer carrier.

B.

The backbone carrier must enable the PE router to check that the packets it receives from the CE router contain only the labels that the PE router advertised to the CE router.

C.

Every packet that crosses the backbone carrier must be encapsulated so that the packet includes MPLS labels

D.

AII PE routers that link the backbone carrier to the customer carrier must run Route Target Rewrite.

E.

A routing protocol is required between the PE and CE routers that connect the backbone carrier to the customer carrier. The routing protocol enables the customer carrier to exchange IGP routing information with the backbone carrier.

 

Correct Answer: ABCE

 

 

QUESTION 208

Which two statements are correct with regard to route distinguisher as defined in RFC 4364 AKA IP-VPN (MPLS-VPN)? (Choose two.)

 

A.

The configuration to define Route-Distinguisher is ip vrf CNT rd 1:1.

B.

A route distinguisher can be imported and exported to and from a VRF.

C.

Route-Distinguisher is an 8 byte BGP attribute value used in influencing BGP best path algorithm.

D.

Route-Distinguisher is an 8 byte value used in creating unique VPNv4 address.

 

Correct Answer: AD

 

 

QUESTION 209

In the context of MPLS, what is the correct action to be performed when an aggregate label is received?

 

A.

It replaces the bottom label in the MPLS label stack with a VPN label and propagates.

B.

It replaces the top label in the MPLS label stack with a VPN label and propagates.

C.

It adds the VPN label into the top label in the MPLS label stack.

D.

It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets.

 

Correct Answer: D

 

 

QUESTION 210

Assume that the PEs are separated by Multiple P routers. How many labels should the ingress PE push for 6PE functionality?

 

A.

1

B.

None

C.

3

D.

2

E.

It depends on the numbers of hops between the ingress and egress PE.

 

Correct Answer: D

Explanation:

A PE device on receiving the IPv6 prefix from CE by routing protocol will assign a label and advertise through BGP to other PE devices which in turn will be advertised to remote CE devices.

 

This label information will be used to switch the packet through MPLS cloud. 6PE implementation will have minimum 2 labels imposed, top label being the one to identify the remote PE while bottom label to identify the IPv6 prefix.

 

Free VCE & PDF File for C
isco 400-201 Real Exam


Instant Access to Free VCE Files: CCNA | CCNP | CCIE …
Instant Access to Free PDF Files: CCNA | CCNP | CCIE …

Comments are closed.