SPEDGE question of the day

[PlAwAnSaI]

Which type of VPN requires a full mesh of virtual circuits to provide optimal site-to-site connectivity?

A. peer-to-peer VPNs

B. MPLS Layer 3 VPNs

C. GET VPNs

D. Layer 2 overlay VPNs

 

[PlAwAnSaI]

Which three Layer 3 VPN technologies are based on the overlay model?

A. MPLS Layer 3 VPNs

B. DMVPNs

C. L2TPv3

D. Frame Relay virtual circuits

E. ATM virtual circuits

F. GRE/IPsec

 

[PlAwAnSaI]

Which VPN technology uses the Group Domain of interpretation as the keying protocol and IPsec for encryption that is often deployed over a private MPLS core network?

A. SSL VPN

B. DMVPN

C. GET VPN

D. L2TPv3

 

[PlAwAnSaI]

What is the primary difference between 6PE and 6VPE?

A. 6VPE provides IPv6 VPN services.

B. 6VPE does not require an MPLS core.

C. 6VPE requires an IPv6-aware core.

D. 6VPE tunnels IPv6 packets inside IPv4 packets.

 

[PlAwAnSaI]

Refer to the Cisco IOS XR router output exhibit,

RP/0/RP1/CPU0:R1#show route vrf red ipv6

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - ISIS, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, su - IS-IS summary null, * - candidate default
U - per-user static route, o - ODR, L - local

Gateway of last resort is not set

B 2001:db80:beef:1::/64
[200/0] via ::ffff:192.168.253.6 (nexthop in vrf default),07:04:14

which method is being used to transport IPv6 traffic over the service provider network?

A. native IPv4

B. 6PE

C. native IPv6

D. dual stack

E. 6VPE

 

[PlAwAnSaI]

Which flavor of MPLS Layer 3 VPN has MPLS enabled on PE-CE links?

A. basic

B. AToM

C. inter-AS

D. CSC

E. VPLS

 

[PlAwAnSaI]

Which MP-BGP address family must be configured to use VPLS autodiscovery in a Cisco IOS XR router?

A. address-family vpls vfi

B. address-family ipv4 mdt

C. address-family vpnv4 unicast

D. address-family l2vpn vpls-vpws

E. address-family ipv4 tunnel

 

[PlAwAnSaI]

In MPLS Layer 3 VPN implementations, what is used on the PE router to isolate potential overlapping routing information between different customers?

A. pseudowire classes

B. pseudowire IDs

C. route targets

D. VC IDs

E. VRFs

 

[PlAwAnSaI]

Within the service provider IP/MPLS core network, what must be implemented to enable Layer 3 MPLS VPN services?

A. targeted LDP between the PE routers

B. LDP between the CE and PE routers

C. RSVP on all the PE and P routers

D. IS-IS or OSPF on all the PE and P routers

E. MP-BGP between the PE routers

 

[PlAwAnSaI]

In MPLS Layer 3 VPN implementations, which mechanism is used to control which routes are imported to a VRF?

A. VRF ID

B. RD

C. PW ID

D. VC ID

E. RT

 

[PlAwAnSaI]

Which two statements regarding Cisco 6PE operations are correct?

A. The inner label in the label stack is assigned by LDP, and it is used for IPv6 forwarding at the egress PE.

B. The top label in the label stack is assigned by LDP, and it is used to reach the egress PE.

C. The top label in the label stack is assigned by MP-BGP, and it is used to reach the egress PE.

D. The inner label in the label stack is assigned by MP-BGP, and it is used for IPv6 forwarding at the egress PE.

 

[PlAwAnSaI]

Which Cisco IOS XR BGP configuration command is required to enable MP-BGP to carry IPv6 VPN routes?

A. address-family vpnv6 unicast

B. address-family vpnv4 unicast

C. address-family ipv4 unicast

D. address-family ipv6 unicast

 

[PlAwAnSaI]

Which statement regarding the Cisco IOS BGP configuration exhibit is correct?

router bgp 65101
no bgp default ipv4-unicast
neighbor 172.16.1.1 remote-as 65101
neighbor 172.16.2.1 remote-as 65101
neighbor 172.16.3.1 remote-as 65101
!
address-family ipv4
neighbor 172.16.1.1 activate
neighbor 172.16.3.1 activate
!
address-family vpnv4
neighbor 172.16.2.1 activate
neighbor 172.16.3.1 activate

A. All three neighbors (172.16.1.1, 172.16.2.1, and 172.16.3.1) will receive both VPNv4 routes and IPv4 BGP routes.

B. All three neighbors (172.16.1.1, 172.16.2.1, and 172.16.3.1) will receive IPv4 BGP routes.

C. Only the 172.16.2.1 and 172.16.3.1 neighbors will receive both VPNv4 routes and IPv4 BGP routes.

D. None of the routers will receive IPv4 BGP routes.

E. Only the 172.16.3.1 neighbor will receive both VPNv4 routes and IPv4 BGP routes.

 

[PlAwAnSaI]

When implementing MPLS Layer 3 VPNs with customers running OSPF as the CE-PE routing protocol, the service provider MPLS backbone looks like what to the CE routers?

A. a transit area (similar to a transit area for supporting virtual links)

B. an external routing domain

C. a superbackbone that is transparent to the CE OSPF routers

D. the backbone (Area 0)

 

[PlAwAnSaI]

When implementing MPLS Layer 3 VPNs with customers running OSPF as the CE-PE routing protocol, which situation will require a sham link to be implemented in the MPLS backbone?

A. to connect customer sites in different OSPF areas

B. if there is a backdoor link between the CE routers, to ensure that the backdoor link is used only to back up the primary connection through the MPLS VPN

C. to connect customer sites in the same OSPF area

D. to prevent OSPF routing loops when a customer site has redundant CE-PE connections

 

[PlAwAnSaI]

On Cisco IOS and IOS XE Layer 3 MPLS VPN implementations, when redistributing the customer RIP routes into MP-BGP, the RIP metric is copied into which BGP attribute?

A. extended community

B. MED

C. local preference

D. weight

 

[PlAwAnSaI]

Which option is used as a loop prevention mechanism to support MPLS VPN customers with multihomed sites?

A. sham links

B. BGP down bit

C. SOO extended BGP community

D. allow as-in

E. AS override

 

[PlAwAnSaI]

Refer to the partial Cisco IOS XR PE router configuration exhibit for supporting a Layer 3 MPLS VPN customer using BGP as the CE-to-PE routing protocol.

router bgp 64500
address-family vpnv4 unicast
!
vrf Customer_A
address-family ipv4 unicast
!
neighbor 10.1.1.1
remote-as 64501
address-family ipv4 unicast

The service provider AS number is 64500, the customer AS number is 64501, and the customer CE router is 10.1.1.1. What is missing in the configuration?

A. The route distinguisher has not been configured under router bgp 64500 vrf Customer_A.

B. The import and export route targets have not been configured under router bgp 64500 vrf Customer_A.

C. The 10.1.1.1 BGP neighbor has not been activated for IPv4 unicast routing.

D. The 10.1.1.1 BGP neighbor has not been activated for the VPNv4 address family.

 

[PlAwAnSaI]

Based on the Cisco IOS XR VRF configuration exhibit,

vrf CustomerA
description Customer A Site
address-family ipv4 unicast
import route-target
1:210
!
export route-target
1:210
!
vrf CustomerB
description Customer B Site
address-family ipv4 unicast
import route-target
1:220
!
export route-target
1:220
!
vrf CustomerA-C
description Customer A Central Site
address-family ipv4 unicast
import route-target
1:210
1:1000
!
export route-target
1:210
1:1000
!
vrf CustomerB-C
description Customer B Central Site
address-family ipv4 unicast
import route-target
1:220
1:1000
!
export route-target
1:220
1:1000

Which two data flows between the MPLS VPNs will be allowed?

A. The CustomerA sites can communicate with all CustomerB sites.

B. The CustomerA central site can communicate with all CustomerA sites.

C. The CustomerA central site can communicate with the CustomerB central site.

D. The CustomerA central site can communicate with all CustomerB sites.

 

[PlAwAnSaI]

Refer to the partial Cisco IOS XR PE router VRF configuration exhibit.

vrf customer1
address-family ipv4 unicast
import route-target
1:1
2:1
!
export route-target
1:1
2:2
!
vrf customer2
address-family ipv4 unicast
import route-target
1:2
2:1
!
export route-target
1:2
2:2

To implement a central-service VPN supporting both customer1 and customer2, what will be the required corresponding VRF configuration on the central-service-server PE router?

A.
vrf central-service-server
address-family ipv4 unicast
import route-target
1:1
1:2
2:1
2:2
3:1
!
export route-target
1:1
1:2
2:1
2:2
3:1

B.
vrf central-service-server
address-family ipv4 unicast
import route-target
2:2
3:1
!
export route-target
2:1
3:1

C.
vrf central-service-server
address-family ipv4 unicast
import route-target
1:1
1:2
3:1
!
export route-target
1:1
1:2
3:1

D.
vrf central-service-server
address-family ipv4 unicast
import route-target
2:1
3:1
!
export route-target
2:2
3:1