H31-161問題集、Huawei実際の試験問題

質問 1

Exhibit:

As shown in the figure, RTA and have one BGP session. To detect fault fast, the BFD for BGP feature needs to be configured on RTA and RTB. BGP-related configurations are as follows:

The only Ethernet link between RTA and RTB becomes faulty when the BGP neighbor session is in ESTABLISHED state and the BFD session is in the UP state. Which statements is true? (Note: BFD works in asynchronous mode)

A. RTA and RTB detect the fault simultaneously.

B. The BGP session between RTA and RTB is interrupted when the BGP hold time (time duration is 180s by default) express.

C. RTA detect the fault faster than RTB.

D. RTB detect the fault faster than RTA.

正解: D

質問 2

Exhibit:

As shown in the figure, external route 1.1.1.0/24 is imported to RTA that is located in the NSSA area RTD is a backbone area router. RTB and RTC are both area border router (ABRs). OSPF configuration are as follows.

Which statement is true?

A. RTD receive an external LSAs whose LS_ID is 1.1.10/24 based on category 7 LSAs sent by RTA

B. RTD receive two external LSAs whose LS_ID is 1.1.1.0

C. RTD receive an external LSAs whose LS_ID is 1.1.1.0 and advRouter is 3.3.3.3.

D. RTD receive an external LSAs whose LS_ID is 1.1.1.0 and advRouter is 2.2.2.2.

正解: C

質問 3

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

A. 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.

B. 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.

C. 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.

D. 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.

E. 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.

正解: B,C

質問 4

CR-LSP and GRE are selected as tunneling policies. CR-LSP has a higher priority and a maximum of three tunnels can be configured for load balancing. Which statement about tunnel selection is false?

A. If the number of tunnels used for load balancing is less than the configured value and CR-LSP or GRE tunnels become Up, these tunnels will also be configured for load balancing.

B. The CR-LSP tunnel in the Up state is preferred. If less than three CR-LSP tunnels are in the Up state, GRE tunnels in the Up state are also selected until there are three available tunnels.

C. When three CR-LSP tunnels are used for load balancing, the three CR-LSP tunnels must be in different

D. One GRE tunnel is selected. If a new CR-LSP tunnel is added or a CR-LSP tunnel becomes Up, the selected GRE tunnel will be replaced with an active CR-LSP.

正解: C

質問 5

If a (*, G) entry exists in the RP, which of the following statements about the source registration process are true in PIM-SM?

A. The first hop DR connecting to the source encapsulates received multicast data into PIM registration information and unicasts the encapsulated information to the RP.

B. The RP unicasts a registration stop message to the first hop router connected to the multicast source.

C. The RP decapsulates registration information and uses RPT to send data packets to be sent to the multicast group to the outbound interface.

D. The RP sends an (S, G) Join message hop by hop to the first hop DR connected to the multicast source to add the multicast source to the SPT.

E. The first-hop DR connecting to the source sends received multicast data to the RP hop by hop.

正解: A,B,C,D

質問 6

Which statement about primary VPN tunnel binding is false?

A. Only the data destined for the specific peer device is transmitted through the n=bound primary VPN tunnel Data to other devices is transmitted using the default tunnel policy.

B. Primary VPN tunnel binding means to bind a tunnel to a specific VPN. The bound tunnel is exclusive to the VPN.

C. The bound primary tunnel can be selected sequentially.

D. Primary tunnel ensures that data can be transmitted from a VPN t a specific peer device permanently through a dedicate TE tunnel.

正解: C

質問 7

Which statement about the interworking between a VPN and the Internet is false?(D)

A. A VPN and the Internet can interwork through the PE, Internet gateway, or CE.

B. For a VPN and the Internet to interwork, network address translation (NAT) must be performed. NAT can be deployed on the interface of a PE used to connect to the Internet gateway, on the interface of a PE used to connect to a CE, or on the interface of a CE used to connect to a PE.

C. A VPN and the Internet can interwork through the CE or PE.

D. For a VPN and the Internet to interwork, the user device used to access the Internet must have a route to the desired address on the Internet and a backhaul route.

正解: B

質問 8

BGP often uses AS PATH to control inter-area routes. Which of the following regular expressions helps ensure that routes within AS 100 and neighboring ASs are received from only one EBGP neighbor?

A. ^100_([0-9]*)$

B. ^100_([0-9]*)

C. ^100_([0-9]+)$

D. 100_([0-9]+)$

正解: A

質問 9

Refer to the exhibit.

As shown in the figure, CE 1 and CE 3 belong to VPN-A, and CE 2 and
CE 4 belong to VPN-B. VPN-target of VPN-A is 111:1, and that of VPN-B is 222:2.Users on different VPNs are not allowed to access each other. Configuration principles are as follows:
1. On the backbone network, if a PE is connected to a CE, VPN instances need to be configured on the PE, and an interface on the PE for connecting to the CE must be bound to a VPN instance. After binding an interface to a VPN instance, you must configure the IP address of the interface.Between PEs, IS-IS is configured for PE interworking, MPLS basic capabilities and MPLS LDP are configured for MPLS LSP establishment, and MP-IBGP is configured for VPN route exchange. LDP is short for Label Distribution Protocol, and IBGP is short for Interior Border Gateway Protocol.
2. A CE exchanges VPN routes with a PE over External Border Gateway Protocol (EBGP).
Which of the following configurations of PE 1 is incorrect? (A)
(1) Configure Interior Gateway Protocol (IGP) on the IS-IS+MPLS backbone network to achieve the interworking between PEs and P routers.
# Configure PE 1 as follows:
[PE 1] isis 100
[PE 1-isis-100] is-level level-2
[PE 1-isis-100] network-entity 10.1234.1234.1234.00
[PE 1] interface loopback1
[PE 1-LoopBack1] ip address 1.1.1.9 32
[PE 1-LoopBack1] isis enable
[PE 1-LoopBack1] quit
[PE 1] interface pos3/0/0
[PE 1-Pos3/0/0] ip address 172.1.1.1 24
[PE 1-Pos3/0/0] isis enable
[PE 1-Pos3/0/0] quit
(2) Configure MPLS basic capabilities and MPLS LDP for setting up LDP LSPs on the IS-IS+MPLS backbone network.
# Configure PE 1 as follows:
[PE 1] mpls lsr-id 1.1.1.9
[PE 1] mpls
[PE 1-mpls] lsp-trigger all
[PE 1-mpls] quit
[PE 1] mpls ldp
[PE 1-mpls-ldp] quit
[PE 1] interface pos 3/0/0
[PE 1-Pos3/0/0] mpls
[PE 1-Pos3/0/0] mpls ldp
[PE 1-Pos3/0/0] quit(3) Configure VPN instances on a PE for connecting CEs to the PE.
# Configure PE 1 as follows:
[PE 1] ip vpn-instance vpna
[PE 1-vpn-instance-vpna] route-distinguisher 100:1
[PE 1-vpn-instance-vpna] vpn-target 111:1 both
[PE 1-vpn-instance-vpna] quit
[PE 1] ip vpn-instance vpnb
[PE 1-vpn-instance-vpnb] route-distinguisher 100:2
[PE 1-vpn-instance-vpnb] vpn-target 222:2 both
[PE 1-vpn-instance-vpnb] quit
[PE 1] interface gigabitethernet 1/0/0
[PE 1-GigabitEthernet1/0/0] ip binding vpn-instance vpna
[PE 1-GigabitEthernet1/0/0] ip address 10.1.1.2 24
[PE 1-GigabitEthernet1/0/0] quit
[PE 1] interface gigabitethernet 2/0/0
[PE 1-GigabitEthernet2/0/0] ip binding vpn-instance vpnb
[PE 1-GigabitEthernet2/0/0] ip address 10.2.1.2 24
[PE 1-GigabitEthernet2/0/0] quit
(4) Set up an EBGP peer relationship between a PE and a CE and import VPN routes.
# Configure PE 1 as follows:
[PE 1] bgp 100
[PE 1-bgp] ipv4-family vpn-instance vpna
[PE 1-bgp-vpna] peer 10.1.1.1 as-number 65410
[PE 1-bgp-vpna] import-route direct
[PE 1-bgp-vpna] quit
[PE 1-bgp] ipv4-family vpn-instance vpnb
[PE 1-bgp-vpnb] peer 10.2.1.1 as-number 65420
[PE 1-bgp-vpnb] import-route direct
[PE 1-bgp-vpnb] quit
(5) Set up an MP-IBGP peer relationship between PEs.
# Configure PE 1 as follows:
[PE 1] bgp 100
[PE 1-bgp] peer 3.3.3.9 as-number 100
[PE 1-bgp] peer 3.3.3.9 connect-interface loopback 1
[PE 1-bgp] ipv4-family vpnv4
[PE 1-bgp-af-vpnv4] peer 3.3.3.9 enable
[PE 1-bgp-af-vpnv4] quit

A. Import IS-IS 200 routes in IS-IS process 100

B. Import BGP routes in IS-IS process 200

C. Import BGP routes in IS-IS process 100

D. Import IS-IS 100 routes in IS-IS process 200c

正解: B

質問 10

If a (*, ) entry exists in the RP, Which of the following statements about the source registration are true in PIM_SM?

A. The first hop DR connecting to the source encapsulate received multicast into PIM registration information and unicast the encapsulated information to the PR.

B. The first-hop RD connecting to the source sends received multicast data to the RP ho[p by hop.

C. The RP encapsulates registration information and uses RTP to send data packet to be sent to the multicast group to the outbound interface.

D. The RP unicast a registration stop message to the first router connection to the multicast source.

E. The RP sends an (S, G) join message hop by hop to the first hop DR connected to the multicast source to add the multicast source to the SPT.

正解: D

質問 11

On a metropolitan area network, VIP customers access the network through the MPLS VPN to ensure their security. Which of the following security deployments are required for PEs?

A. Deploy protocol authentication if a router protocol is used between PEs and CEs.

B. Configure the ACL to filter out IP packets that use the IP address of the CE-connected interface as the destination address.

C. Configure the ACL to filter out data packets with common network viruses at the interface connected to the CE.

D. Configure the CP-CAR on the interface connected to the CE.

正解: A,C

質問 12

When the multicast source starts to send multicast data and no receiver joins in the RP in PIM-SM, which of the following statements are true?

A. After receiving a registration message, the RP creates the multicast routing entries (*, G) of all source groups and sends a register stop message to the source DR.

B. After the source DR unicasts registration information to the RP, the multicast routing entries (S, G) of all source groups are generated in the RP but the outbound interface is null.

C. After all sources unicast registration information to the RP, no multicast route entries related to source groups are generated due to receiver absence.

D. The RP receives a registration message from the source DR, creates a multicast routing entry (S, G), and sends a register stop message to the source DR.

正解: B,D

質問 13

Exhibit:

As shown in the figure, complex traffic classification is configured for RTA's upstream GigabitEthernet 1/0/0. The QoS is configured as follows:

A tester sends TCP packets from GE 1/1 to GE 1/2 at 40 1.2.2 IF DSCP values of packets GE receives are not 46, what are the possible causes?

A. DSCP values of sent packets are not 10.

B. The qos phb command is enabled on RTA's GigabitEthernet1/0/0.

C. The default mapping from the EF value to the DDCP value is modified

D. STC is disabled at RTA's GigabitEthernet 1/0/0.

正解: A

質問 14

Which statement about the MPLS LSP traceroute is true?

A. Echo request route sends by the LSP traceroute can cay multiple downstream mapping TLVs.

B. The destination IP address if an Echo request sent by the LSP traceroute is the IP address of the corresponding FEC.

C. The egress route sends back an reply packet containing the downstream mapping TLV if the receives Echo request contains the downstream mapping TLV.

D. The downstream mapping TLV is used to carry downstream information of the correct node.

正解: D

Huawei HCIE-Carrier IP (Written) - H31-161 模擬練習