[Free] Download New Latest (November) Cisco 400-201 Actual Tests 211-220

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QUESTION 211

Which two features prevent routing loops between the OSPF sites of a customer when the sites are multihomed or a backdoor link is used between the sites? (Choose two.)

 

A.

sham link

B.

down bit

C.

virtual link

D.

Site of Origin

E.

domain tag

 

Correct Answer: BE

Explanation:

If a route sent from a PE router to a CE router could then be received by another PE router from one of its own CE router, there are chances of routing loops. This situation is possible when a “backdoor link” connects two CE routers connected to two different PE routers. To prevent this, the PE sets the DN bit in any LSA that it sends to the CE router. If the PE router receives any LSA with DN bit set, it ignores the LSA.

 

1) DN bit:

When a PE router sends a Type-3 LSA to a CE router, the DN bit in LSA Options field must be set. Now if the CE router sends the Type-3 LSA to other PE router(s), the PE router will not redistribute it further.

 

When a PE router needs to distribute a route to a CE router which comes from the outside of CE router’s OSPF domain, the PE router presents itself as an ASBR and distributes the route in Type-5 LSA. The DN bit must be set in the LSA.

 

The Options field is present in all LSAs. The Options field is 1-byte long as follows- DN O DC EA N/P MC E MT

 

2) Route Tags (Domain Tags):

In some implementations (where DN bit is not set), Domain Tags (named by Cisco) are used to ensure Type-5

LSAs generated by a PE router will be ignored by other PE routers that may receive it. The value of Domain tag is configurable and arbitrary if not set. Hence must be distinct from other OSPF tags

 

 

 

 

 

QUESTION 212

Refer to the exhibit. The service provider is an MPLS and IPv4 enabled network. Which two approaches can enable IPv6 tunneling between site A and site B over the backbone? (Choose two.)

 

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A.

IPv6 customer premise (6CP) over MPLS

B.

IPv6 VPN provider edge (6VPE) over MPLS

C.

IPv6 virtual forwarding (6VF) over MPLS

D.

IPv6 forwarding instance (6FI) over MPLS

E.

IPv6 provider edge router (6PE) over MPLS

 

Correct Answer: BE

 

 

QUESTION 213

When configuring Multicast VPN (MVPN) over an MPLS core, both the Default and Data MDT is configured under which configuration mode?

 

A.

router(config-router)#

B.

router(config)#

C.

router(config-router-af)#

D.

router(config-if)#

E.

router(config-vrf)#

 

Correct Answer: E

 

 

QUESTION 214

Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used between PE and CE in MPLS-VPN networks? (Choose two)

 

A.

BGP cost community

B.

BGP feature allow-as in

C.

Access-list Control in Distance Vector protocol like RIP and EIGRP.

D.

SHAM links with OSPF

E.

RPF Reverse Path forwarding.

F.

Site Of Origin SOO.

 

Correct Answer: CF

 

 

QUESTION 215

Option 10C is an implementation of Inter-AS MPLS VPN. Which two statements about Option 10C are true? (Choose two.)

 

A.

Great scalability is offered

B.

Route Target Rewrite must be configured on ASBRs

C.

Multihop EBGP is utilized between route reflectors

D.

Multihop EBGP is utilized between ASBRs

E.

The ASBRs hold VPNv4 routes

 

Correct Answer: AC

 

 

QUESTION 216

Which statement about VPNv6 addresses is true?

 

A.

The VPNv6 address is a 96-bit route distinguisher and a 128-bit IPv6 address.

B.

The VPNv6 address is a 64-bit route distinguisher and a 128-bit IPv6 address.

C.

The VPNv6 address is a 64-bit route distinguisher and a 96-bit IPv6 address.

D.

The VPMv6 address is a 96-bit route distinguisher and a 96-bit IPv6 address.

E.

The VPNv6 address is a 128-bit route distinguisher and a 128-bit IPv6 address.

 

Correct Answer: B

 

 

QUESTION 217

Using more than one label on a single packet is required in what context?

 

A.

MPLS TE

B.

When CEF switching and Label switching is done

C.

In all the above circumstances.

D.

MPLS VPN

 

Correct Answer: D

 

 

 

 

 

QUESTION 218

In which Cisco IOS configuration mode is the route distinguisher (RD) configured?

 

A.

R1(config-route-at)#

B.

R1(config-route-map)#

C.

R1(config-it)#

D.

R1(config-vrf)#

E.

R1(config)#

F.

R1(router)#

 

Correct Answer: D

 

 

QUESTION 219

Option 10A (back-to-back VRF) is an implementation of inter-AS MPLS VPN. Which of four statements about option 10A are not true? (Choose four.)

 

A.

MPLS is required between the ASBRs.

B.

ASBR must hold all routing information.

C.

It is a scalable solution.

D.

It is a simple solution.

E.

MP-EBGP is used to exchange routes between ASBRs.

 

Correct Answer: ACDE

 

 

QUESTION 220

What is the encapsulation format of an MPLS Multicast VPN (MVPN) packet?

 

A.

IP unicast in IP unicast

B.

IP multicast in IP anycast

C.

IP anycast in IP anycast

D.

IP multicast in IP unicast

E.

IP multicast in IP multicast

F.

IP unicast in IP multicast

 

Correct Answer: E

 

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