Alcatel Lucent Scalable IP Networks Set 4

1.

What operation is performed by an LSR when it receives an MPLS labeled packet?

The LSR refers to its routing table and forwards the packet to the next LSR or LER without altering the MPLS label. The LSR refers to its MPLS label table, swaps the label and forwards the packet to the next LSR or LER. The LSR refers to its MPLS label table forwards the packet to the next LSR or LER without altering the MPLS label. The LSR refers to its MPLS label table, pops the label and forwards the packet to the next IP router.

2.

What is the function of an LSR?

Label Switching Routers make switching decisions based on the original MAC Header. Label Switching Routers make routing decisions based on the original IP Header. Label Switching Routers make forwarding decisions based on the MPLS label. Label Switching Routers make decisions based on ATM header information.

3.

In an MPLS network, which device is responsible for taking an unlabeled packet and encapsulating it with an MPLS label?

Ingress Label Edge Router Egress Label Edge Router Label Switching Router Next Hop Router

4.

Multiple SAPs may be defined on the same physical port and may be used for different services.

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5.

SAPs may be a port, a port with a specific VLAN tag in the case of an Ethernet port, or a port with a specific Circuit ID in the case of ATM or Frame Relay.

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6.

Which statement best describes an SDP?

Service Delivery Points are defined on the service provider network side and used to bind the service to an MPLS transport tunnel. Many services can be bound
to a single SDP. Service Delivery Points are defined on the service provider access side and used to bind the connection of the service to CE device. Many services can bebound to a single SDP. Service Delivery Points are defined on the service provider network side and used to bind the service to an MPLS transport tunnel. Only one service can bebound to a single SDP. Service Delivery Points are defined on the service provider access side and used to bind the service to CE device. Only one service can be bound to a singleSDP.

7.

Which statement best describes a VPRN service?

From the customers perspective it looks as if all sites are connected by the same set of dark fibers. From the customers perspective it looks as if all sites are connected to a private switched network administered by the service provider. From the customers perspective it looks as if all sites are connected to a private routed network administered by the service provider. From the customers perspective it looks as if all sites have public internet access administered by the service provider.

8.

How does a VPRN service avoid the problem overlapping IP addresses from different customers?

You cannot have overlapping IP addresses. The service provider must ensure that its customers are all using discrete IP address space. Each VPRN service maintains a separate VPN routing and forwarding instance to separate customer routing information. A VPRN will ignore IP addressing information and use MAC addressing instead which are always unique. A VPRN will translate customer IP addresses to a private addressing scheme administered by the service provider.

9.

How does a VPRN service avoid the problem of overlapping IP addresses from different customers?

You cannot have overlapping IP addresses. Customers must change their IP address assignment. Each VPRN service maintains a separate VPN routing and forwarding instance to separate customer routing information. This allows for overlapping addresses. A VPRN ignores IP addressing information and uses MAC addressing instead, which are always unique. A VPRN translates customer IP addresses to a private addressing scheme administered by the service provider.

10.

A VPWS service maintains a MAC Forwarding Database (FDB) for Ethernet SAPs.

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Alcatel Lucent Scalable IP Networks Set 4

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