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4A0-100 PDF

QUESTION 155
What operation is performed by an LSR when it receives an MPLS labeled packet?
A. The LSR refers to its routing table and forwards the packet to the next LSR or LER without altering the MPLS label.
B. The LSR refers to its MPLS label table, swaps the label and forwards the packet to the next LSR or LER.
C. The LSR refers to its MPLS label table forwards the packet to the next LSR or LER without altering the MPLS label.
D. The LSR refers to its MPLS label table, pops the label and forwards the packet to the next IP router.

Correct Answer: B
QUESTION 156
What is the function of an LSR?
A. Label Switching Routers make switching decisions based on the original MAC Header.
B. Label Switching Routers make routing decisions based on the original IP Header.
C. Label Switching Routers make forwarding decisions based on the MPLS label.
D. Label Switching Routers make routing decisions based on the original IP Header.

Correct Answer: C
QUESTION 157
In an MPLS network, which device is responsible for taking an unlabeled packet and encapsulating it with an MPLS label?
A. Ingress Label Edge Router.
B. Egress Label Edge Router.
C. Label Switching Router.
D. Next Hop Router.
Correct Answer: A
QUESTION 158
Which of the following are correct statements about MPLS labels (Choose three)?
A. A series of labels from one LER to another LER represent a logical tunnel known as an LSP.
B. Labels used for a LSP may be static but are usually signaled dynamically with an MPLS label signaling protocol.
C. Labels are locally significant to the MPLS router which means its possible for two routers on the LSP path to use the same label.
D. Labels are globally significant to the MPLS network which means all labels on the LSP path must be unique.
E. Labels used for an LSP must be statically assigned by the service provider.
Correct Answer: ABC
QUESTION 159
Which device is responsible for removing the MPLS label before the packet reaches the CE device?
A. The CE device removes the MPLS label.
B. The last LSR on the LSP removes the MPLS label.
C. MPLS labels are not removed until they reach the final destination.
D. The egress LER removes the MPLS label.

Correct Answer: D

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QUESTION 160
Which two protocols are used for the dynamic signaling of MPLS labels (Choose two)?
A. RSVP-TE
B. CSPF
C. PNNI
D. LDP

Correct Answer: AD
QUESTION 161
How does LDP select the path used for an LSP?
A. LDP monitors the available bandwidth on all links and signals the LSP based on this information.
B. LDP uses the shortest hop-count between two endpoints for the LSP.
C. LDP must be configured hop-by-hop by the service provider.
D. LDP follows the path chosen by the IGP.

Correct Answer: D
QUESTION 162
A CE device has a physical connection to which device in the service providers MPLS network?
A. CE always connects to a PE router.
B. CE always connects to a P router.
C. CE always connects to another CE device.
D. The CE does not connect to the service provider network.

Correct Answer: A
QUESTION 163
Which of the following are accurate statements about the PE device in a service providers MPLS network? (Select three)
A. A PE router only connects to CE devices.
B. A PE router only connects to P routers.
C. A PE router connects to at least one P router.
D. A PE router connects to at least one CE device.
E. PE routers support many different interface types connecting to CE devices.
F. PE routers only support Ethernet interfaces connecting to the CE.
Correct Answer: CDE
QUESTION 164
Where would you expect to find a P router in a service provider’s network?
A. At the edge of the provider’s network facing the customer.
B. At the edge of the customer’s network facing the provider.
C. In the core of the providers network.
D. On the customer premises.

Correct Answer: C QUESTION 165
Which of the following are considered Virtual Private Networks? Choose all that apply.
A. IES
B. VPWS
C. VPLS
D. VPRN

Correct Answer: BCD

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