Free HCIE Carrier IP (Written) V1.0 Exam H31-161 Exam Practice Test

Which of the following statements describe the reliability requirements of the voice service for theIP bearer network?

• Key modules of equipment must support active/standby switching or other redundancy backup functions.
• The IP network uses a full/half-meshed structure and provides redundant links to strengthen the self-healing capability.
• Link protection switching time = 50 ms
• Link protection switching time can larger than 150 ms

Which of the following statements about the relationship between the SPE and the UPE are false?

• The UPE provides access service for users. It maintains the routes of the VPN sites it is directly connected to and sometimes aggregates routes of remote VPN sites. In addition, a UPE allocates inner labels for routes of the sites directly connected to the UPE and advertises VPN routes with these labels to an SPE through MP-BGP.
• The SPE manages and advertises VPN routes. It maintains all routes on the VPN it is connected to through UPEs, including routes of local and remote sites. The SPE, however, does not advertise routes of remote sites to the UPE, but only advertises the labeled default routes or aggregate routes of VPN instances.
• The SPE and UPE are relative to each other. In a hierarchical PE structure, a PE on the upper layer is the SPE to PEs on the lower layer, and these lower-layer PEs are UPEs to the SPE. However, the hierarchical PE cannot coexist with common PEs on an MPLS network.
• When MP-IBGP is deployed between an SPE and UPEs, the SPE can function as the RR of these UPEs so that routes can be advertised between IBGP peers. It is not recommended that an SPE serving as the RR of UPEs still reflect routes between other PEs so that routes on UPEs can be reduced. A UPE and an SPE communicate through a physical interface, subinterface, or tunnel interface. When the tunnel interface is configured, only one MPLS network is allowed between them and labeled packets are transferred through tunnels. Their communication may fail if the MPLS network is replaced with an IP network.
• The SPE has a large routing table, which provides excellent forwarding performance and access capability, whereas the UPE has a small routing table and poor forwarding performance, but occupies fewer interface resources.

Which of the following methods can be used to ensure loop-free and reachable Martini VPLS links?

• Split horizon
• Poison reverse
• Spanning tree algorithm
• Full-meshed PEs

Which statement about the OSPF VPN is true? (B)

• A VPN instance can include multiple OSPF processes. An OSPF process can be bound to multiple VPN instances.
• OSPF ASs are differentiated by domain ID. Therefore, devices within one AS must be configured with the same domain ID.
• An OSPF process can be configured with one or multiple primary domain IDs.
• When a PE is an OSPF ABR, the PE is connected to a CE only in a non-backbone OSPF area.

Which of the following statements about IGP Shortcut and FA are true?

• An MPLS TE tunnel is viewed as a link and the MPLS TE tunnel interface is used as the outbound interface of a route.
• When IGP Shortcut is enabled, MPLS TE tunnels can be advertised to routers as if they are links.
• If FA is enabled on an MPLS TE tunnel, the MPLS TE tunnel can be shared by other routers.
• OSPF BFD does not need to be applied to IGP Shortcut-enabled tunnels.

In PIM-DM, which of the following scenarios about sending Join messages is true?

• The leaf router in the idle state receives host Join messages.
• The router receives prune messages of the RPF neighbor from other routers when it is receiving data from the upstream.
• The intermediate router receives graft messages from the downstream router when all downstream interfaces of the intermediate router are in the prune state.
• The router receives state-refresh messages.

On the OSPF network, which of the following statements about the authentication function of the OSPF protocol are true?

• The OSPF protocol supports area authentication and interface authentication.
• The interface authentication mode must be consistent with the area authentication mode . For Example, interface and area are authentication in simple or MDS mode or are not authenticated.
• The interface authentication mode can be different from the area authentication mode.
• The authentication function of the OSPF is implemented by parameter settings in hello packets.

As shown in the figure, MPLS, MPLS TE, and MPLS RSVP-TE are configured on RTA, RTB, RTC, and RTD. Tunnel1/0/0 and Tunnel2/0/0 are set up based on the explicit path RTA-RTB-RTC. Tunnel1/0/0 has a hot-standby path (RTA-RTD-RTC) and an FRR path: RTA-RTD-RTC, whereas Tunnel2/0/0 has an ordinary path (RTA-RTD-RTC) and an FRR path. Which of the following statements are true?

• When the link between RTA and RTB is faulty, the state of Tunnel1/0/0 is hotstanby inuse.
• When the link between RTA and RTB is faulty, the state of Tunnel2/0/0 is ordinary inuse.
• When the link between RTA and RTB is faulty, the state of Tunnel2/0/0 is FRR inuse.
• When the link between RTB and RTC is faulty, the state of Tunnel2/0/0 is ordinary inuse.

Which statement describes the delay variation requirement of the voice service for the IP bearer network?

• No strict requirement
• Bearer network delay variation + 1s
• Bearer network delay variation +100 ms, allowed maximum delay variation +200 ms
• Bearer network delay variation = 10 ms. Allowed maximum delay variation =20ms

In which L2VPN technology is L2VPN information transferred through the extended LDPsignaling?

• Cross circuit connection (CCC)
• Martini
• Kompella
• SVC