Huawei HCIE-Carrier IP (Written) - H31-161 FREE EXAM DUMPS QUESTIONS & ANSWERS]

Question 1

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

A. 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. B. 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. C. 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. D. 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. E. 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.

Discussion 0

Correct Answer: A,D Vote an answer

Question 2

Which statement about the Ethernet clock synchronization technology used in actual solutions is true?

A. The IEEE1588 technology requires the intermediate node to support transparent clock transmission. B. The 802.1as technology requires the intermediate node to support transparent clock transmission. C. The NTP technology requires the intermediate node to support transparent clock transmission. D. The CES packet recovery technology requires the intermediate node to support transparent clock transmission.

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Correct Answer: B Vote an answer

Question 3

Exhibit:

As shown in the figure, virtual private LAN service (VPLS) is enabled on routers PE 1 and PE 2.CEs are connected to PEs through QinQ and PC A and PC B are connected to the two CEs. The two PCs belong to the same VPN and can communicate with each other properly. Which of the following statements about the communication process when you ping PC B from PC A are true?

A. PE 1 receives packets with a VLAN tag from CE 1 and adds a VLAN tag to these packets. B. PE 1 add two MPLS labels to a packet before sending the packet to a router. C. A packet received by CE 2 from PE 2 has two VLAN tags CE 2 removed the outer tab and forwards the packets to PC B based on the inner tag D. If the penultimate hop popping (PHP) feature of MPLS is enabled on PEs, a packet received by PE 2 from a P router has two VLAN tags one MPLS label.

Discussion 0

Correct Answer: A,B,D Vote an answer

Question 4

Exhibit:

As shown in the figure, OSPF process 100 runs on both PEs and CEs, and VPN routers are transmitted between PE 1 and PE 2 through PGB CE 1 enables interface address 43.1.1.0/24 in area 0.A route to 43.1.10/24. However, does not exist in the routing table of CE 2. What are the possible causes?

A. The LSDB of PE 1 does not have the type 1 LSA generated by CE 1. B. The LSDB of PE 12 does not have the type 1 LSA generated by CE 1. C. The VPN route to 43.1.1.0/24 does not exist in the routing table of PE 2. D. The public network rout to 43.1.1.0/24 does not exist in the routing table of PE2
.

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Correct Answer: A,D Vote an answer

Question 5

In PIM DM, which of the following statements about state-refresh message processing are true?

A. State-refresh messages carry the (S, G) assert and prune status of downstream interfaces. B. Only state-refresh messages received by the RPF interface may be forwarded. C. If an interface with the (S, G) entry is in the prune state, state-refresh messages are not forwarded to the interface. D. If an interface with the (S, G) entry is an assert loser, state-refresh messages are not forwarded to the interface. E. State-refresh messages are generated only on the DRs that directly connect to multicast sources.

Discussion 0

Correct Answer: A,B,D Vote an answer

Question 6

Refer to the exhibit.

As shown in the figure, RTA, RTB, RTC, and RTD are connected through a switch. From small to large in order of the MAC address, the four routers are arranged as follows:
RTB, RTA, RTD, and RTC. The Level-2 DIS priority is set to 100 on RTB and RTD, and IS-IS BFD is enabled on all these routers. When the links of RTB are down, how should IS-IS BFD sessions be set up?

A. Level 2 IS-IS BFD sessions are set up among RTA, RTC, and RTD, and a level 1 IS-IS BFD session is set up between RTC and RTD. B. Level 1 and level 2 IS-IS BFD sessions are set up among RTA, RTC, and RTD. C. Level 1 and level 2 IS-IS BFD sessions are set up only between RTC and RTD D. Level 2 IS-IS BFD sessions are set up between RTD and RTA as well as between RTD and RTC, and a level 1 IS-IS BFD session is set up between RTC and RTD.

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Correct Answer: D Vote an answer

Question 7

As shown in the figure, the costs of paths from RTA to RT 11, RT 12, RT
13, RT 14, and RT 15 are all 10 and the available bandwidth is 200 Mbit/s.
The costs of paths from RTB to RT 31, RT 32, RT 33, RT 34, and RT 35 are all 10 and the available bandwidth is 200 Mbit/s.
The costs of paths from RT 11 to RT 21 and from RT 21 to RT 31 are both 5. The available bandwidth is 200 Mbit/s.
The cost of the path from RT 12 to RT 32 is 5 and the available bandwidth is 120 Mbit/s. The cost of the path from RT 13 to RT 33 is 10 and the available bandwidth is 80 Mbit/s.
The cost of the path from RT 14 to RT 34 is 10 and the available bandwidth is 100 Mbit/s.
The cost of the path from RT 15 to RT 35 is 10 and the available bandwidth is 100 Mbit/s.
The load balancing rule of Constraint Shortest Path First (CSPF) is set to Random on RTA.
Which path will a 100 Mbit/s tunnel from RTA to RTB take?

A. RTA-RT15-RT35-RTB B. RTA-RT14-RT34-RTB C. RTA-RT11-RT21-RT31-RTB D. RTA-RT12-RT32-RTB E. RTA-RT13-RT33-RTB

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Correct Answer: A,B Vote an answer

Question 8

Exhibit:

As shown in the figure, inter-AS VPN Option A is used. CE 1 and CE 2 belong to the same VPNAS 100 and AS 200 run IGP and LDP, respectively.
ASBRs communicate with each other through EBGP. the loopback interface address of CE 1 is 10.1.1.1/24 Suppose VPNs configured on the PE and ASBR are both named vpn-1 and CE 2 can ping CE1. Which command can be ruin on ASBR 2 to find out route 10.1.1.1/24?

A. Display bgp vpnv4 all routing-table B. Display ip routing-table C. Display ip routing-table vpn-instance vpn_1

Discussion 0

Correct Answer: C Vote an answer

Question 9

On a VPLS network a PE router receive a packet that containers layer 2 user data from a PE. How does the PE router determine the source VSI of this packet?

A. Outer label of the packets B. Destination MAC address in the L2 PDU encapsulation in the packet C. Inner label of the packet D. MAC address and VLAN ID in the PDU encapsulated in the packet

Discussion 0

Correct Answer: C Vote an answer

Question 10

#
pim
c-rp Ethernet6/2/0
timer hello 100
state-refresh-interval 10
state-refresh-ttl 60
Interface Ethernet6/2/0Ip address 20.1.1.3 255.255.255.0
Pim timer hello 45
Pim dm
#
Which of the following statements are false?

A. Ethernet 6/2/0 sends a PIM hello message every 100 seconds. B. The TTL value is 60 in state-refresh messages sent by the router. C. If the PIM-DM is enabled at Ethernet 6/2/0 on a router, the PIM-SM cannot be enabled at other interfaces on the router. D. Ethernet 6/2/0 sends a state-refresh message every 10 seconds.

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Correct Answer: A,D Vote an answer

Question 11

Which of the following statements about the working principle f LDAP FRR are true?

A. After LDP FRR is enabled, a backup LSP is generated both the primary and backup LSPs are stored in the forwarding table. B. Multiple LSPs can be up on the ingress node, that is entries about multiple backup LSPs are generated in the forwarding table according to the priority of the FRR, implementing multi-layer protection. C. After LDP FRR enable, a backup can degenerated for a primary LSP to prevent serious packet loss during fats flapping of the primary LSP. D. LDP TFRR can be deployed on the ingress node and the intermediate node. The primary and backup LSPas are recorded in the ILM table on the intermediate node and on the FIB table on the ingress node.

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Correct Answer: C Vote an answer

Question 12

Which of the following statements about the Dynamic Host Configuration Protocol (DHCP) snooping function are true?

A. It prevents Mac Flood attacks. B. It prevents DHCP starvation attacks. C. It prevents fake DHCP server attacks. D. It prevents denial-of-service (Dos) attacks from changing the CHADDR value

Discussion 0

Correct Answer: B,C,D Vote an answer

Question 13

Exhibit:

RTA is an edge router of the MPLS backbone network. It provides the access services for users under Layer 2 switches and different users by subinterface . User A access VLAN 12 and has subscribed to the His, VoIP, and IPTV services. According to 802 1p priorities, the value indicates the His service, 1 indicates the VoIp service, and 4 indicates the IPTV service. RTA is configured on he access side as follows.

What is the descending order of service priorities?

A. HSI, VoIP, IPTV B. IPTV, VoIP, HSI C. HSI, IPTV, VoIP D. VoIP, IPTV, HSI

Discussion 0

Correct Answer: C Vote an answer

Question 14

An Ethernet cable connects RTA to RTB through Ethernet 0/0.the OSPF neighbor relationship can be established without enabling the OSPF authentication function is enabled, Which of the following statements about the OSPF relationship between RTA and RTB are true?

A. The OSPF neighbor relationship cannot be established between RTA and RTB due to failure of area authentication B. The OSPF neighbor relationship can be established between RTA and RTB C. Simple authentication is used between RTA and RTB D. MD5 authentication is used between RTA and RTB

Discussion 0

Correct Answer: B,D Vote an answer

Question 15

As shown in the figure, the DiffServ model is deployed in E-LSP mode on the MPLS network. A tester connects to GE interfaces of RTA and RTC on the edge of the MPLS network through GE links. The trust upstream default command is configured for interfaces on the IP access side of RTA and RTC. When the tester sends IP packets with DSCP values 10, 12, and 14,the DSCP values of IP packets received at the receiver side are supposed to remain unchanged. However, the DSCP values of all received IP packets are 10. In this case, which of the following statements are true? (Default mapping is configured between the EXP and DSCP values on each router.)

A. The DSCP values are 10 when RTA's IP packets leave the MPLS network because the EXP values are 1 when RTA's IP packets enter the MPLS network. B. The configurations on RTA or RTC are incorrect. C. If the qos phb disable command is configured for the outbound interface on the IP access side of RTC, the DSCP values of packets the tester receives remain unchanged. D. The DSCP values of packets the tester receives are 10 regardless of whether qos phb disable is configured for the outbound interface on RTC's IP access side.

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Correct Answer: A,C Vote an answer