4A0-106 試験問題と解答 - 模擬練習 - 練習問題・模擬試験

Question No : 1
Click the exhibit.

For the inter-AS model B VPRN, which of the following is FALSE when CE2 sends an IP packet to 192.168.1.1?

A.PE2 pushes one label on the IP packet and forwards it to ASBR2.
B.ASBR2 forwards the IP packet with one label to ASBR1.
C.ASBR1 forwards the IP packet with two labels to PEL
D.PE1 forwards an unlabeled IP packet to CE1.

正解:

Question No : 2
Which of the following best describes the goal of an Extranet VPRN?

A.Allow routes to be exchanged between all or selected sites of one VPRN and all or selected sites of a second VPRN
B.Allow the service provider to provide multiple VPRNs with Internet access
C.Reduce the number of VPRN tunnels required
D.Simplify the administration of multiple VPRNs
E.Force all traffic in multiple VPRNs to pass through a single device

正解:

Question No : 3
At what point does the Route Target become associated with a route?

A.When the route is first received at the P from the PE
B.When the route from the CE is populated into the VRF at the PE
C.When the route from the PE is populated into the VRF at the CE
D.When the route is propagated from the PE to the CE
E.When the route is exported into the MP-BGP table from the VRF

正解:

Question No : 4
What is wrong with the configuration shown below?

A.The VPRN ID must be the same value as is used in the vrf-target command
B.The VPRN ID must be the same value as is used in the route-distinguisher command
C.The router-id command should not be used in this context
D.The vrf-target command is mandatory
E.There is nothing wrong with this configuration

正解:

Question No : 5
Which of the following statements is true? Choose the best answer.

A.A P router may forward customer packets to their destination without the presence of a route to that destination
B.The ingress PE router may forward customer packets to their destination without the presence of a route to that destination
C.The egress PE router may forward customer packets to their destination without the presence of a route to that destination
D.Any provider core router (P or PE) may forward customer packets to their destination without the presence of a route to that destination

正解:

Question No : 6
For a Carrier Supporting Carrier (CSC) VPRN where the customer carrier is an ISP that provides Internet connectivity to its end-customers, which of the following is FALSE?

A.All traffic exchanged between end-customers is carried over a single CSC VR
B.Customer carrier PE routers residing in different sites must run eBGP between them to exchange customers' routes.
C.The customer carrier network can be a pure IP network.
D.MPLS can be used in the customer carrier network to improve scalability.

正解:

Question No : 7
What are the main functions of a Layer 3 VPN? (Choose three).

A.Distributing customer routing information between sites
B.Forwarding customer data packets
C.Providing an integrated billing solution
D.Maintaining separation between distinct customer networks
E.Allowing the implementation of Layer 3 devices in the provider core

正解:

Question No : 8
Click the exhibit.

Community lists are configured for the PE hub and spoke VPRN.
Which communities should be exported by the VPRN service on PE1?

A."Spoke.Sites" and "Hub_Site"
B."Spoke_Sites"
C."Hub_Site"
D.No communities should be exported

正解:

Question No : 9
In a traditional layer 3 VPN which of the following will be an issue when there is overlapping address space between two customers? Choose the best answer.

A.There will be increased memory usage on the PE
B.There will be increased CPU utilization on the PE
C.The CE will reject the overlapping prefix
D.The PE will not recognize the prefixes as being different
E.There is no issue with overlapping address space in a traditional Layer 3 VPN

正解:

Question No : 10
Click the exhibit.

Which of the following best describes the output?

A.The AS-Path is not present because a policy is configured on PE2 to set it to null.
B.The AS-Path is not present because a policy is configured on CE1 to set it to null.
C.The AS-Path is not present because a policy is configured on PE1 to set it to null.
D.The AS-Path is not present because VPN-IPv4 routes do not propagate the IPv4 AS-Path BGP attribute.

正解:

Question No : 11
Which of the following about BGP Site of Origin (SoO) is FALSE?

A.The SoO attribute can be used to uniquely identify the site from which a PE learns routes.
B.Before a PE redistributes a VPN-IPv4 route, it can assign an SoO attribute to the route.
C.The SoO attribute can be used to prevent loops from a single site with multiple CE-PE connections.
D.The SoO attribute can be used as matching criteria when redistributing routes from the CE to the P

正解:

Question No : 12
Which command may be used on an Nokia 7750 SR to verify the number of VRF routes allowed, based on the maximum routes value configured in the service instance?

A.Show service id <service-id> base
B.Show router bgp <service-id> routes
C.Show service id <service-id> maximum-routes
D.Show router <service-id> status

正解:

Question No : 13
You are configuring a VPLS spoke termination to a VPRN on an Nokia 7750 SR.
If LDP is used for all transport tunnels, what type of sessions are established by the VPRN PE router that is configured with the spoke termination?

A.T-LDP and LDP sessions with the other VPRN PE routers and the VPLS PE router
B.T-LDP sessions with the other VPRN PE routers and the VPLS PE router
C.LDP sessions with the other VPRN PE routers and the VPLS PE router
D.LDP sessions with the other VPRN PE routers, and both T-LDP and LDP sessions with the VPLS PE router
E.T-LDP and LDP sessions with the other VPRN PE routers and LDP sessions with the VPLS PE router

正解:

Question No : 14
An advantage of using BGP as the PE-CE protocol is that route policies are no longer required to control the exchange of routes from BGP to MP-BGP.

A.True
B.False

正解:

Question No : 15
Which of the following describes how a route is handled when is received at the PE from the local CE?

A.It will be placed into the customer VRF and automatically propagated into the BGP table
B.It will be placed into the customer VRF and then be propagated to the BGP table only if BGP is used as the PE-CE protocol
C.It will be placed into the customer VRF and require an export policy to be propagated to the BGP table
D.It will be placed into the customer VRF and require an export policy to be propagated to the BGP table if RIP is used as the PE-CE protocol
E.It will be placed into the customer VRF and require an export policy to be placed into the BGP table if a protocol other than BGP is used as the PE-CE protocol

正解:

Alcatel Lucent 4A0-106 問題練習