最新的HCIE-Carrier IP認證 H31-161考試題庫

問題1

Refer to the exhibit.

As shown in the figure, DUT stands for the device under test and RTA is used to support the test.What is the correct procedure of a fast convergence test? ( )
1. Read data from the tester, record the numbers of sent and received packets, and count the number of lost packets.2. Switch the DUT-to-RTA background traffic to the link whose metric value is 100.3. DUT-to-RTA background traffic is forwarded along the link whose metric value is 10.4. Use the tester to advertise 10K routes to RTA and inject 10K flows to the DUT (each flow takes one route).5. Remove the optical fiber (providing a link whose metric value is 10) from the tester.6.
Calculate the convergence time based on the number of lost packets and packet sending rate.7.
Stop forwarding traffic when the packet receiving rate is equal to the packet sending rate.

A. 3 5 4 2 1 6 7

B. 1, 2, 3, 4, 5, 6, 7

C. 4, 3, 5, 2, 7, 1, 6

D. 3, 4, 5, 7, 2, 1, 6

正確答案: C

問題2

As shown in the figure, for SWA, Eth0/2 belongs to VLAN 2, and Eth0/24 (PVID = 2) is a trunk interface and permits packets from VLAN 2 and VLAN 3 to pass through; for SWB, Eth0/2 belongs to VLAN 2, Eth0/3 belongs to VLAN 3, and Eth0/24 (PVID) is a trunk interface and permits packets from VLAN 2 and VLAN 3 to pass through. Which statement is true?

A. PC A can ping both PC B and PC C.

B. PC A can ping neither PC B nor PC C.

C. PC A can ping PC B instead of PC C.

D. PC A can ping PC C instead of PC B.

正確答案: D

問題3

The VRRP is enabled on the firewall dual-system Intranet users use NAT to access extranet FTP services Which of the following statements are true?

A. The NAT cannot be used in easy IP mode.

B. VRIDs of the VRRP do not need to be bound with the NAI during NAI configuration in the outbound direction between domains.

C. The FTP Nat Alg function must be enabled on the firewall

D. VRIDs of the VRRP must be bound with the NAT during NAT configuration in the outbound direction between domain.

正確答案: A,C,D

問題4

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

A. The OSPF protocol supports area authentication and interface authentication.

B. 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.

C. The authentication function of the OSPF is implemented by parameter settings in hello packets.

D. The interface authentication mode can be different from the area authentication mode.

正確答案: A,C,D

問題5

RTA is a leaf router that directly connects to host A through interface GigabitEthernet 1/0/0. The interface is configured as follows:
interface GigabitEthernet1/0/0
undo shutdown
ip address 192.168.4.2 255.255.255.0
pim sm
igmp enable
igmp version 3igmp ssm-mapping enable
igmp static-group 232.1.1.1
Configurations in the IGMP view are as follows:
igmp
ssm-mapping 232.1.1.0 255.255.255.0 10.10.1.1
ssm-mapping 232.1.2.0 255.255.255.0 10.10.1.1
Host A sends an IGMPv2 Report message to group 232.1.2.2. Which entry can be displayed by the display igmp ssm-mapping group command?

A. (10.10.1.1, 232.1.1.1) and (10.10.1.1, 232.1.2.2)

B. No entry

C. (10.10.1.1, 232.1.2.2)

D. (10.10.1.1, 232.1.1.1)

正確答案: A

問題6

As shown in the figure, RTA connects to RTB and RTC. A TE tunnel is configured on RTA to reach RTC. The TE tunnel cannot be successfully established. However, CSPFbased path calculation is successful and RTA does not receive any PathErro messages. What are possible causes?

A. The reserved bandwidth is insufficient at interface RTB-2.

B. An interface address on RTB is the same as the address of interface RTA-1.

C. RSVP-TE is not configured at interface RTB-2.

D. Different authentication keys are configured on interfaces RTB-2 and RTC-1.

正確答案: C,D

問題7

As shown in the figure, the PHP function is enabled on all routers by default and an MPLS TE tunnel RT 1-RT 2-RT 3-RT 4-RT 5 is set up between RT 1 and RT 5. See the figure for label distribution of the TE tunnel. A bypass tunnel RT 2-RT 6-RT 4 is configured on RT 2 to protect RT 3. See the figure for the label distribution of the bypass tunnel. When RT 3 is faulty, RT 2 switches traffic to the bypass tunnel. How many MPLS labels do packets on the path from RT
6 to RT 4 have? What is the value of each label?

A. Two labels; label value: 1200 for the outer label and 2200 for the inner label

B. Two labels; label value: 3 for the outer label and 2200 for the inner label

C. One label; label value: 3

D. One label; label value: 2200

正確答案: D

問題8

As shown in the figure, the asymmetric VLL FRR networking is used. AC
interfaces on PE 1, PE 2, and PE 3 are configured as follows:
Configuration of the AC interface on PE 1:
interface Pos3/0/1link-protocol ppp
undo shutdown
oam detect lcp-terminal notify lcp-terminal
ip address 208.1.1.1 255.255.255.0
ip address 208.2.2.1 255.255.255.0 sub
mpls l2vc pw-template pw1 13579 ip-interworking
mpls l2vc pw-template pw2 24680 ip-interworking secondary
mpls l2vpn oam-mapping
mpls l2vpn reroute immediately resume 0
Configuration of the AC interface on PE 2:
interface Pos1/0/3
link-protocol ppp
undo shutdown
ip address 208.1.1.2 255.255.255.0
mpls l2vc pw-template pw1 13579 ip-interworking
mpls l2vpn oam-mapping
Configuration of the AC interface on PE 3:
interface Pos1/0/0
link-protocol hdlc
undo shutdown
oam detect hello-stop notify hello-stop
ip address 208.2.2.2 255.255.255.0
mpls l2vc pw-template pw1 24680 ip-interworking
mpls l2vpn oam-mapping
Which of the following statements are true on the condition that IGP and MPLS are configured correctly on the public network?

A. If a forwarding fault is detected on the public network side of the PW between PE 1 and PE 2, traffic from CE 2 to CE 1 can be switched to the PW between PE 1 and PE 3.

B. If a forwarding fault is detected on the PW between PE 1 and PE 2, traffic from CE 1 to CE 2 can be switched to the PW between PE 1 and PE 3.

C. If a forwarding fault is detected on the PW between PE 1 and PE 2, traffic can be switched to the backup PW on PE 1.

D. The PW between PE 1 and PE 2 is the primary PW.

正確答案: B,C,D

問題9

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-RT13-RT33-RTB

B. RTA-RT15-RT35-RTB

C. RTA-RT12-RT32-RTB

D. RTA-RT11-RT21-RT31-RTB

E. RTA-RT14-RT34-RTB

正確答案: B,E

問題10

Which of the following statements about LDP-IGP synchronization are true?

A. The LDP and IGP synchronization involves four states: Init, Hold-down, Hold-max-cost, and Syncachieved.

B. The LDP and IGP synchronization helps shorten the time for switching traffic from the standby link back to the active link and the switchback can be complete within several milliseconds.

C. The LDP-IGP synchronization involves three timers: Hold-down, Hold-max-cost, and Syncachieved.

D. The LDP-IGP synchronization means to postpone the route switchback until LDP completes convergence by suppressing the establishment of IGP neighbor relationships or setting the cost of route advertisement to the largest value.

正確答案: A,B,D

問題11

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

A. OSPF ASs are differentiated by domain ID. Therefore, devices within one AS must be configured with the same domain ID.

B. A VPN instance can include multiple OSPF processes. An OSPF process can be bound to multiple VPN instances.

C. When a PE is an OSPF ABR, the PE is connected to a CE only in a non-backbone OSPF area.

D. An OSPF process can be configured with one or multiple primary domain IDs.

正確答案: A

問題12

Refer to the exhibit.

As shown in the figure, PE 1 sets up an MP-IBGP neighbor relationship
with PE 2 and they communicate over MPLS LDP. A CE communicates with a PE over OSPF.
Configure the VRF on PE 1 as follows:
ip vpn-instance vrf1
route-distinguisher 100:1
vpn-target 1:1 export-extcommunity
vpn-target 1:1 import-extcommunityConfigure OSPF on PE 1 as follows:
ospf 1 vpn-instance vrf1
area 0.0.0.0
network 100.1.1.0 0.0.0.255
Configure BGP on PE 1 as follows:
bgp 100
peer 22.22.22.22 as-number 100
peer 22.22.22.22 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
peer 22.22.22.22 enable
#
ipv4-family vpnv4
policy vpn-target
peer 22.22.22.22 enable
#
ipv4-family vpn-instance vrf1
import-route ospf 1
PE 2 has the same configurations as PE 1. MP-IBGP neighbor relationships have been set up between PEs, and OSPF neighbor relationships have been set up between PEs and CEs. A valid route 1.1.1.1/32 is imported from CE 1 to an OSPF area, but CE 1 does not learn the route. What is the reason?

A. CE can be connected to a PE through OSPF only when the PE also runs OSPF.

B. CE cannot be connected to a PE through OSPF.

C. An RD is shared by VRFs on PE 1 and PE 2.

D. BGP routes must be imported to OSPF areas on a PE.

正確答案: D

問題13

On a BGP/MPLS VPN, a PE and a CE communicate with each other over OSPF. Which command cannot be configured on the PE?

A. route-tag 3

B. vpn-instance-capability simple

C. domain-id 3

D. sham-hello

正確答案: B

問題14

Which of the following statements about control words in the L2VPN are true?

A. The control word can be used for packet padding For example, when the public network uses Ethernet and the AC uses Peer-to-protocol (PPP), control words can be used to transfer and identify PPP packet with a bytes.

B. When Martini VLL is used, if PEs at two ends of a virtual connection (VC) use different control words, the VC may not become Up

C. The control word can be used to identically the packet sequence.

D. A control word generally has two bytes and can ne extended to four bytes.

E. When SVC VLL is used, if PEs at two ends of a VC use different control words, the may not become Up.

正確答案: D

問題15

About the merits and demerits of inter-AS VPN-IPv4 Option B using MP-EBGP between ASBRs, which statement is true?

A. An ASBR is required to store all VPN routes, which challenges the performance of the ASBR.

B. An ASBR does not store VPN routes but sends them out as label data.

C. The inter-AS scheme in Option B is an inherent feature of VPN.

D. VRFs matching PEs must be configured on the ASBR.

正確答案: A

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