Testking cisco 646-222
Vendor: cisco
Exam Code: 646-222
Exam Name: IP Communications Express Account Manager (IPCXAM) (Others Certification )
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QUESTION 6:
In order for MPLS to be implemented on ATM switches, what requirements must
the ATM switch meet? Select two.
A. become Layer 3 aware by running a routing protocol
B. use MPLS LDP or TDP to distribute and receive MPLS label information
C. use BGP to exchange MPLS VPN labels in the data plane
D. use RSVP to exchange MPLS traffic-engineering labels in the data plane
E. establish a full mesh of Layer 2 ATM virtual circuits between all the ATM switches in
the MPLS domain
F. use cell-mode MPLS and insert MPLS label in the ATM AAL5 header
Answer: A, B
QUESTION 7:
When running basic MPLS in conjunction with VPNs, how many labels does each
packet contain?
A. Each packet contains one label that identifies the VPN.
B. Each packet contains at least two labels. One label identifies the path to the egress
router and one that identifies the VPN.
C. Each packet contains at least three labels. One label identifies the ingress router, one
identifies the egress router and one identifies the path that will be taken.
D. Each packet contains at least three labels. One label identifies the ingress router, one
label identifies the path to the egress router, and one identifies the VPN.
Answer: B
QUESTION 8:
On ingress, a label is imposed to a packet. Which process is responsible for this
function?
A. LDP process.
B. Control plane process
C. Penultimate hop process.
D. Forwarding plane process.
Answer: B
QUESTION 9:
How could you check for potential MTU size issues on the path taken by a PE-to-PE
LSP?
A. Because MPLS packets are label switched, MTU problems can only be detected by
the user applications.
B. Use the ping vrf command with packet size set to the largest MTU along the path and
DF bit set from the local PE-router to ping the remote PE-router.
C. Use the ping vrf command with packet size set to the smallest MTU along the path
and DF bit set from the local PE-router to ping the remote PE-router.
D. Because MPLS packets are label switched, packets are automatically fragmented and
reassembled by the PE-routers.
Therefore, there are no potential MTU issues.
Answer: A D
QUESTION 10:
Which one of the following is true regarding MPLS independent control label
allocations?
A. The LSR can always assign a label for a destination prefix, even if it has no
downstream label.
B. The LSR can assign a label for a destination prefix only if it has already receives a
label from the next-hop LSR, otherwise, it must request a label from the next-hop LSR.
C. The LSR will assign a label to a destination prefix only when asked for a label by an
upstream LSR.
D. The label for a destination prefix is allocated and advertised to all LDP peers, regardless
of whether the LDP peers are upstream or downstream LSRs for the destination prefix.
E. The LSR stores the receives label in its LIB, even when the label is not received from
the next-hop LSR.
F. The LSR stores only the labels received from the next-hop LSR, all other labels are
ignored.
Answer: A
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