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Questions # 11:

Click on the exhibit button below. Assume the following:

Question # 11

- The protected path is R1-R2-R3-R6.

- Fast reroute one-to-one protection is enabled.

If the original LSP already has two labels, and router R2 has failed, how many labels will there be in packets on the detour path?

Options:
A.

1

B.

2

C.

3

D.

4

Expert Solution
Questions # 12:

Click on the exhibit.

Question # 12

This policy is applied as an LDP export policy. In addition to the FECs learned from its neighbors, which FECs now appear in the router's LIB?

Options:
A.

Local FECs not included in the 192.168.1.0/24 address space and the system IP FEC.

B.

Only the system IP FEC appears in the LIB.

C.

Any local FECs, except those with a 24-bit mask.

D.

Local FECs in the 192.168.1.0/24 address space.

Expert Solution
Questions # 13:

Which of the following regarding MPLS Encapsulation is FALSE?

Options:
A.

The customer's Layer 2 header is preserved at the iLER for Layer 2 services.

B.

The customer's Layer 2 Header is preserved at the iLER for Layer 3 services.

C.

The service provider's Layer 2 header is added at the iLER for Layer 2 services.

D.

The service provider's Layer 2 header is added at the iLER for Layer 3 services.

Expert Solution
Questions # 14:

Which of the following about T-LDP is FALSE?

Options:
A.

Link-based and T-LDP sessions may be configured on the same LSR.

B.

T-LDP supports sessions between non-directly connected devices.

C.

T-LDP can be configured between directly connected devices.

D.

T-LDP Hello messages are sent to a multicast address.

Expert Solution
Questions # 15:

Which of the following is described by the following statement? An LSR propagates a label mapping only for an FEC for which it has a label mapping for the FEC next-hop.

Options:
A.

Independent control mode.

B.

Ordered control mode.

C.

Liberal label retention.

D.

Conservative label retention.

E.

Downstream on demand

Expert Solution
Questions # 16:

Which of the following about Alcatel-Lucent 7750 SR command "oam Isp-trace prefix" is FALSE?

Options:
A.

The router performs a unidirectional LSP test.

B.

The router collects hop information along the tunnel's path.

C.

The router uses MPLS Echo Request packets that are IP-routed,

D.

The MPLS TTL values are incremented at each request.

Expert Solution
Questions # 17:

Which mode does the following statement describe? An LSR will advertise a label mapping immediately, without waiting for a label mapping from the FEC's next-hop.

Options:
A.

Liberal label retention mode

B.

Conservative label retention mode

C.

Ordered control mode

D.

Independent control mode

Expert Solution
Questions # 18:

How does MPLS-TE overcome the issue of IP hyper-aggregation?

Options:
A.

By enabling the creation of LSPs across alternate links to balance the network traffic.

B.

By eliminating the requirement for core IP routing.

C.

By not allowing more than one LSP to use a particular path.

D.

By defining multiple LSPs across a network and implementing an IGP load balancing algorithm across them.

Expert Solution
Questions # 19:

Click on the exhibit button below. Assume the following:

Question # 19

- Each router's OSPF interfaces are in the areas shown.

- Bidirectional LDP-over-RSVP tunnels extend from routers R1 to R3 and back over the path R1-R4-R5-R3.

- You enable fast reroute facility bypass on the R5-R3 RSVP LSP.

- Router R5 acts as a PLR, protecting the R5-R3 link by building a bypass tunnel through router R2.

You build a layer 2 VPN on routers R1 and R3, using the LDP-over-RSVP tunnels. What MPLS configuration step must you complete on router R2 for it to protect the end-to-end service?

Options:
A.

Enable LDP on the R2-R5 interface.

B.

Configure T-LDP sessions between routers R2 and R5 and R3.

C.

Configure LDP-over-RSVP support on router R2.

D.

Enable MPLS and RSVP on the router R2 network interfaces.

E.

Enable LDP on the R2-R5 and R2-R3 interfaces.

Expert Solution
Questions # 20:

Which of the following about T-LDP on the Alcatel-Lucent 7750 SR is FALSE?

Options:
A.

T-LDP is used to provide an end-to-end session between two PE routers.

B.

T-LDP is used to signal service labels for Layer 2 services.

C.

T-LDP is used to establish transport tunnels for Layer 2 services.

D.

T-LDP is used in LDP over RSVP solution.

Expert Solution
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