H31-161 HCIE-Carrier IP (Written) Questions and Answers

As shown in the figure, DUT stands for the device under test and RTA is

used to support the test. Which combination of the following configurations is mandatory for fast convergence?

1. BFD

2. Minimum LSP refreshing interval

3. Most sensitive SPF timer

4. Minimum Hello packet sending interval

5. Minimum LSP sending interval

6. Longest computing time of SPF slices

7. Minimum LSP retransmission interval

8. Minimum LSP generation time

9. Flash-flood

10. GR function

11. Setting cost-style to wide

Which of the following statements about the L2VPN are true?

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

1. On the backbone network , if a PE is connect to a CE, VPN instances need to b reconfigured on the PE, and 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 configured for PE interworking. PLSA basic capabilities and MPLS LSP are configured for LSP establishment, and MP _IBGP is configured for VPN route exchange VPN routes exchange , LDAP is short for Label Distribution Protocol, and IBGP is short for interior Border gateway protocol.

2. A CE exchange route exchange routers with a PE over External Border gateway Protocol (EBGP.

Configure interior gateway protocol (IGP) on the IS-IS+MPLS backbone networking to achieve the interworking between PEs and IP routers.

As shown in the figure, the AS number of operator 1 is 100 and that of

operator 2 is 200. Option C is used for exchanging VPN routes between AS 100 and AS 200. Which of the following statements about Option C are true?

Which of the following statements about the fault notification in VLL FRR are true?

Refer to the exhibit

.

As shown in the figure, basic BGP/MPLS IP VPN configuration has been completed on routers. Which of the following configurations is incorrect for advertising default

routes in VPN instances on the SPE?

Note: All configurations are performed on the SPE.

On the typical access network of a bearer network, a core network device connects to two

upstream CEs. CEs connect to PEs in a square shape. This access network must bear voice and

signaling services. A CE must be configured with two VPNs to separate the voice and signaling

services and ensure high security and QoS. The signaling service works in active/standby mode,

and the voice service works in load sharing mode. The VRRP must be enabled between the CEs to

terminate the signaling flow. If the network robustness is ensured and the network architecture is

rational, which of the following statements about the topological structure are true?

As shown in the figure, RTA, RTB, and RTC use the OSPF protocol. The default cost value is used for links, and unicast routes converge on the entire network. The Loopback 0 interface is set to configure RTC as the RP or BSR. The SPT switching threshold uses the default value on RTB. The receiver joins the multicast group 225.1.1.1. The multicast source sends multicast data to the destination address 225.1.1.1. Which interface is the inbound interface in the (10.1.1.1, 225.1.1.1) entry on RTB?

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?

In which L2VPN technology is L2VPN information transferred through the extended LDP

signaling?

Which of the following statements about the merits of the HoVPN networking are true?

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?

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

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

A PW is found Down after VPLS is configured on an NE series router. What are possible causes?

On a city’s dual-plane bearer network, PE1-A and PE1-B are two PEs in different planes of the city.

Three CEs are on the same VPN. The OSPF is used to exchange VPN route information between CE

1 and PE1-A and between CE 2 and PE1-B. The default route leading to PE1-A is configured on CE

3, and a static route leading to CE 3 is configured on PE1-A. The static route is imported to the OSPF,

and the OSPF route is imported to the VPN instance of the BGP. The MP-IBGP neighbor relationship

is established among the PEs. Subinterfaces are enabled in the links between PEs and are bound

to the same VPN to exchange VPN route information between PEs. How many routes on PE1-B can reach CE 3?

As shown in the figure, IGP is configured on RT 1 and RT 2, and route 193.3.6.0/24 is configured on RT 2. Which of the following statements is correct? Suppose OSPF is used here. Configure an access control list (ACL) on RT 2 in system mode.

ACL 2000

rule 5 permit source 193.3.6.0 0.0.0.255

Configure a routing policy in system mode:

route-policy t permit node 1

if-match acl 2000

apply backup-nexthop 106.108.4.1

apply backup-interface Ethernet4/0/4

Configure the IP FRR in system mode:

ip frr route-policy tConfigure the ethe4/0/4 interface of RT 2:

ospf cost 100

Configure BFD on RT 2:

Enable BFD on Ethernet4/0/3

bfd b1 bind peer-ip 106.108.3.1 interface Ethernet4/0/3

discriminator local 1

discriminator remote 1

min-tx-interval 10

min-rx-interval 10

process-pst

commit

Configuration on RT 1:

Enable BFD on Ethernet7/0/3

bfd b1 bind peer-ip 106.108.3.2 interface Ethernet7/0/3

discriminator local 1

discriminator remote 1

min-tx-interval 10

min-rx-interval 10

process-pst

commit

Which message does the pseudo wire emulation edge-to-edge (PWE3) add for LDP signaling

extension compared with Martini VLL?

Which statement describes the packet loss ratio requirement of the voice service for the IP bearer network?

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?

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?

Refer to the exhibit.

As shown in the figure, a CE requires access to the Internet, and PE 1 is

connected to the Internet gateway. Configurations on PE 1 are as follows:

PE 1:

#

nat address-group 0 175.31.1.3 175.31.1.10

#

ip vpn-instance vrf1route-distinguisher 192.168.1.1:100

vpn-target 100:1 export-extcommunity

vpn-target 100:1 import-extcommunity

#

acl number 2000

rule 5 permit vpn-instance vrf1

#

#

interface Serial0/0/1:0

link-protocol ppp

ip binding vpn-instance vrf1

ip address 150.1.1.1 255.255.0.0

nat outbound acl 2000 address-group 0

#

interface Pos2/1/0

clock master

link-protocol ppp

ip address 175.31.1.1 255.255.0.0

#

bgp 100

group ibgp internal

peer ibgp connect-interface LoopBack0peer 192.168.1.2 as-number 100

peer 192.168.1.2 group ibgp

#

ipv4-family unicast

undo synchronization

peer ibgp enable

peer 192.168.1.2 enable

peer 192.168.1.2 group ibgp

#

ipv4-family vpnv4

policy vpn-target

peer ibgp enable

peer 192.168.1.2 enable

peer 192.168.1.2 group ibgp

#

ipv4-family vpn-instance vrf1

default-route imported

import-route direct

import-route static

group nei_vrf1 external

peer nei_vrf1 as-number 65004

peer 150.1.1.2 as-number 65004peer 150.1.1.2 group nei_vrf1

#

ip route-static vpn-instance vrf1 0.0.0.0 0.0.0.0 175.31.1.2

PE 1 is connected to the Internet gateway through interface 175.31.1.2. CE 1 and CE 2 cannot ping

this interface. Which of the following statements are true?

Configurations are as follows:

#

multicast routing-enable

#

msdp

peer 2.2.2.2 connect-interface loopback0

peer 3.3.3.3 connect-interface loopback0

import-source acl 3000

peer 2.2.2.2 sa--policy import acl 3001

peer 3.3.3.3 sa--policy export acl 3002

#

Interface loopback0

ip address 1.1.1.1 32

pim sm

#

acl 3000

rule 5 deny ip destination 230.0.0.1 0 source 30.0.0.1 0

rule 10 permit ip

#

acl 3001

rule 5 permit ip destination 231.0.0.1 0 source 30.0.0.1 0

#

acl 3002

rule 5 permit ip destination 233.0.0.1 0 source 30.0.0.1 0

#

Which statement is true?