4A0-103 - Alcatel-Lucent Multiprotocol Label Switching
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What is the significance of receiving a packet with the bottom MPLS label S bit set to 1?
It indicates that the label is the bottom of the MPLS label stack.
Which of the following is NOT an advantage of MPLS shortcuts for BGP traffic?
It eliminates the need to run IGP on all routers within an AS.
Which of the following regarding label population is TRUE?
Selected labels from the LIB are populated to the LFIB.
Which of the following about label modes on the Alcatel-Lucent 7750 SR is FALSE?
LDP uses conservative label retention mode.
Which of the following about LSP path configuration on an Alcatel-Lucent 7750 SR is TRUE?
The path may be used for multiple LSPs.
Which of the following statements regarding RSVP-TE is FALSE?
RSVP-TE operates in a downstream unsolicited label advertisement mode.
Which of the following statements regarding LSPs are true? (Choose two)
IGP-based LSPs are established solely from information contained in routing tables.
The constraint-based routed LSP is calculated at the ingress of the network, based on the router database and user defined constraints.
What labels are encapsulated in the tunnels used by a 6PE deployment?
The inner label is the IPv6 Explicit Null. The outer label is an MPLS transport label.
Which of the following is defined by the following statement? All label mappings received from all peer LSRs are saved.
Liberal label retention.
Which default LDP parameter are you able to change with CLI?
Initially, all ports on an Alcatel-Lucent 7750 SR have 10Gbps bandwidth. RSVP configuration limits reservable bandwidth to 30 percent on all interfaces. An LSP is signaled reserving 1 Gbps bandwidth. How much unreserved bandwidth is left on the interface?
Which of the following prerequisites must you configure on a router to enable LDP-over-RSVP support? (Choose two)
Configure the T-LDP peers for tunneling.
Enable Idp-over-rsvp in the IGP configuration on the PEs and ABRs
Which of the following about LSPs is FALSE?
IGP-based LSPs must use LDP signaling.
Which of the following about the RSVP-TE Hello protocol is FALSE?
An interface with multiple RSVP sessions sends Hello messages for each session.
Which of the following about CAC is FALSE?
CAC is used to perform a bandwidth check based on the router's LSDB.
Router R3 signals an LSP, reserving 1Gbps bandwidth on a 10Gbps link. RSVP configuration limits reservable bandwidth to 20 percent on the egress interface. Which of the following statements is true?
The egress RSVP interface has 1 Gbps bandwidth unreserved.
What is the function of the MPLS label assigned to a packet?
It identifies the FEC.
Which of the following best describes downstream on demand label distribution?
An LSR distributes a label mapping for a FEC when it has been requested to do so.
Fill in the blanks: A ________device has all interfaces inside the provider domain, and a _______ device has at least one interface outside the provider domain.
Which of the following about Alcatel-Lucent 7750 SR command "oam Isp-trace prefix" is FALSE?
The router uses MPLS Echo Request packets that are IP-routed,
Which of the following statements regarding LDP-over-RSVP are true? (Choose two)
LDP prefixes resolve to an RSVP LSP, rather than to a physical egress interface.
RSVP LSPs must exist between each PE-ABR pair, or ABR-ABR pair in each area.
Which of the following statements is true of an established LDP session?
It uses a TCP connection with well known port number 646.
Which of the following devices assumes the active role during the establishment of an LDP session?
The peer with the higher transport address.
Which of the following best describes downstream unsolicited label distribution?
An LSR may advertise label mappings to all peers for which it might be a next-hop for a given FEC.
An LSP path is configured as follows: - Shared-explicit reservation style - Make-before-break (MBB) enabled - 500Mpbs bandwidth reserved on a 1Gbps link With 100Mbps of unreserved bandwidth remaining, the operator increases the LSP-path's bandwidth reservation to 900Mbps. What happens to the existing LSP?
CSPF looks for the delta bandwidth, implementing make-before-break.
Which of the following about configuring an LSP path definition on an Alcatel-Lucent 7750 SR is FALSE?
A path definition is not required if CSPF is enabled on an LSP.
Which of the following describes how a router sets the destination IP address for an RSVP RESV message?
It sets the address to the next upstream hop from the PSB.
Which of the following regarding MPLS label value assignment is FALSE?
Label values may be dynamically assigned by IGP.
Which LSA type is used for OSPF-TE?
Type 10 LSA -- Area local Opaque LSA
How does a DMP inform the downstream routers that it has merged detour tunnels?
The DMP sends a single PATH message containing the merged DETOUR_Objects.
Two directly connected routers set different interface Hello timeout values. Router R1 uses 15 seconds, while router R2 uses 30 seconds. Which of the following best describes the LDP adjacency?
The adjacency forms with the lower timeout value.
Which of the following are characteristics of an LSP? (Choose two)
It is unidirectional.
It provides a specific tunnel for a FEC through the network.
Which of the following reservation styles can be used to prevent both the primary and secondary paths from booking resources on a common link?
Which of the following is a characteristic of LDP Hello messages?
They are multicast to the All Routers address.
Which of the following about Fast Reroute node protection tunnels is FALSE?
Node protection tunnels are only used by one-to-one Fast Reroute.
Which of the following statements regarding LSP path configuration are true? (Choose three)
The path may comprise loose hop entries only.
The path may be used for multiple LSPs.
When a device receives a labeled packet, which of the following can occur?
The packet can be forwarded as a labeled or unlabeled packet, depending on the received label value.
Which of the following indicates the path over which an LSP's tail end router will return an RSVP RESV message?
The Path State Block (PSB)
Which of the following are functions of the MPLS control plane in a router? (Choose two)
Label allocation and management.
Which of the following regarding MPLS encapsulation for VPRN services is TRUE?
The customer's Layer 3 header is removed at the iLER.
Which LSA is used for OSPF-TE purposes?
Type 10 LSA ?Area local LSA
Which of the following describes 6PE?
P routers run IPv4 only. PE routers run both IPv4 and IPv6 and exchange IPv6 routes using MP-BGP.
If an Alcatel-Lucent 7750 SR is an iLER operating in pipe mode, which of the following regarding the TC field (EXP bits) is TRUE?
The TC field is set to a specific value via explicit administrative configuration.
An LSP is configured with one-to-one FRR and node protection on a Alcatel-Lucent 7750 SR. Which of the following is FALSE?
A single protection tunnel can protect all LSPs that go through the same hop.
Which MPLS label mode propagates a label mapping only for the FEC for which a router has a label mapping for the FEC's next-hop?
Ordered control mode
How many bits of the MPLS header are used for the label field?
Which of the following LDP message categories is UDP-based?
Which of the following are the default settings for the Alcatel-Lucent 7750 SR when using LDP?
Per-platform label space, liberal retention mode
If an LSP needs to use an admin group, which of the following configurations is NOT required on the Alcatel-Lucent 7750 SR?
Configure at least one strict hop on the LSP path.
Which of the following about Fast Reroute link protection tunnels is FALSE?
Link protection tunnels detour around a failed next downstream router.