Which of the following statements about BFD for MPLS LSP are true?

• A.In BFD for MPLS LSP, LSP Ping is used to negotiate the identifier and parameters of a BFD session.
• B.An MPLS LSP may be unidirectional .If BFD packets are transmitted along an MPLS LSP in the forward direction., these packets may be forwarded over IP in the reverse direction. Then the forward and reverse paths of a packet may be different As a result, when a fault occurs on the reverse path, BFD detects and reports the fault even if the MPLS LSP is normal.
• C.BFD for MPLS LSP detects faults only on the forwarding plane. LSP Ping, however, can not only detect faults on the forwarding plane, but also find out inconsistencies between the forwarding plane and the control plain- Therefore, they are often combined for a better fault detection solution.
• D.If MPLS LSPs work in load balancing mode, a BFP session should be triggered on each LSP in principle. Only one BFD session. however, can be initialed for load-balancing MPLS LSPs to an intermediate node In this case, the forwarding path ol BFD packets may be different from what expected. As a result may be reported or missed.

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Exhibit.

RTA is an edge route of the MPLS backbone network. It provides the access for users under layer 2 switches
and differentiates user by subinterface. User access VALN 100 and has subscribed to the His ViIP , and
services. According to 802 1p priorities, the value 0 indicates the HIS service, 1 indicates the VoIp service and
4 indicate the IPTV service. The DiffSerc model is deployed in E-LSP mode on the MPLS network,
And the STC is configured for subinterface on the access side of RTA (the qos phb disable command is not
configured). Outgoing on the traffic on the G1/0/0.1 suninterface involves the His VoIP, and services on the
access side of RTA. Which statements about EXP about values corresponding to these three services is true?

• A.At least three EXP values be contained, and the values are uncertain.
• B.Only one EXP may be contained, and the value is uncertain
• C.Only two EXP values be contains, and the values are certain.
• D.The EXP values must be 0, 1, and 4.

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Which of the following are conditions for bringing the remote CCC connection Up? (ABE)

• A.If a next hop is specified in CCC configuration, a route to the next hop is available.
• B.The interface that is bound to a CCC connection is physically Up.
• C.MPLS LDP is enabled on the outbound interface of the public network.
• D.If an outbound interface is specified in CCC configuration, the outbound interface is Up.
• E.MPLS is enabled on the outbound interface of the public network.

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An IPTV bearer network requires the broadband TV (BTV), VOD, and near video on demand (NVOD) services. Video programs use the standard MPEG 4 codec format. Which of the following statements about the QoS policy are true?

• A.Ensure that the BTV service has a higher priority than the VOD/NVOD service, and forward the downstream traffic and some protocol packets, such as the IGMP and PIM packets in priority.
• B.Ensure that the VOD/NVOD service has a higher priority than the BTV service and guarantee QoS of both the upstream and downstream traffic.
• C.To ensure the IPTV service quality on the user side, reserve 4 Mbit/s bandwidth for the IPTV service for each user and plan extra bandwidth for the broadband Internet service.
• D.To ensure the IPTV service quality on the user side, reserve 2.5 Mbit/s bandwidth for the IPTV service for each user and plan extra bandwidth for the broadband Internet service.

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Refer to the exhibit.

As shown in the figure, RT 5 is a stub area router, an external Internet route is imported by RT 1, and a virtual connection is established between RT 1 and RT 3.At present, the Internet is accessible to routers except RT 5. Why can the Internet not be accessed from RT 5?(Select two answers)

• A.A stub area cannot be connected using a virtual link.
• B.RT1 does not inform RT 5 that category 3 LSAs are configured by default.
• C.Category 5 LSAs cannot be sent in a stub area.
• D.The cost of the link between RT 1 and RT 3 is excessively large.

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