H31-161 Online Practice Questions and Answers

Which of the following can be implemented in an IP backbone network?

A. RIP

B. BGP

C. ISIS

D. MPLS

RTA is an edge router of the MPLS backbone network. It provides the access service for users under Layer 2 switches and differentiates users by subinterface. User A accesses VLAN 100 and has subscribed to the HSI, VoIP, and IPTV services. According to 802.1p priorities, the value 0 indicates the HSI service, 1 indicates the VoIP service, and 4 indicates the IPTV service. The DiffServ model is deployed in E-LSP mode on the MPLS network, and the STC is configured for subinterfaces on the access side of RTA (the qos phb disable command is not configured). Outgoing traffic on the G1/0/0.1 subinterface involves the HSI, VoIP, and IPTV services on the access side of RTA. Which statement about EXP values corresponding to these three services is true?

A. Only one EXP value may be contained, and the value is uncertain.

B. Only two EXP values may be contained, and the values are uncertain.

C. At least three EXP values may be contained, and the values are uncertain.

D. The EXP values must be 0, 1, and 4.

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 CE1 and PE1-A and between CE 2 and PE1-B. The default route leading to PE1-A is configured on CE3, 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?

A. Only one (The route leading to CE 3 is learned based on the IBGP neighbor relationship between PEs. The other route is filtered out by OSPF loopback detection.)

B. Two (One route is learned based on the IBGP neighbor relationship between PEs, and the other one is the OSPF category-5 route.)

C. No route

D. Only the OSPF category-5 route can reach CE 3.

RTA is a leaf router that directly connects to host A through interface GigabitEthernet 1/0/0.

The interface is configured as follows:

interface Ethernet1/0/0

undo shutdown

ip address 192.168.4.2 255.255.255.0

pim sm

igmp enable

igmp version 3

igmp ssm-mapping enable

Configurations in the IGMP view are as follows:

igmp

ssm-mapping 233.1.1.0 255.255.255.0 10.10.1.1

A user sends an IGMPv2 Report message on host A to join groups 232.1.1.1 and 233.1.1.1 but the user

cannot receive (10.10.1.1, 232.1.1.1) and (10.10.1.1, 233.1.1.1) messages. To solve this problem, which of

the following configurations are required?

A. Configure ssm-mapping 232.1.1.0 255.255.255.0 10.10.1.1 in the IGMP view.

B. Configure ssm-policy in the PIM view and use the ACL to set the SSM group address range to

233.1.1.1.

C. Configure ssm-policy in the PIM view and use the ACL to set the SSM group address range to

232.1.1.1.

D. Configure ssm-policy in the PIM view and use the ACL to set the SSM group address range to

232.1.1.1 and 233.1.1.1.

Which functions does the bearer network NMS mainly provide?

A. Monitoring network traffic

B. Switchover time of a device's active/standby system

C. Monitoring device load(CPU and Memory)

D. Packet loss delay

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. VoIP, IPTV, HSI

B. HSI, VoIP, IPTV

C. IPTV, VoIP, HSI

D. HSI, IPTV, VoIP

display current-configuration # multicast routing-enable # interface Ethernet6/1/0 ip address 10.1.1.1 255.255.255.0 igmp timer query 40 # igmp

The preceding are partial multicast router configurations. How long is the interval (in seconds) for sending IGMP General Query messages when IGMP is enabled on Ethernet 6/1/0?

A. 15

B. 10

C. 40

D. 60

In asymmetric dual-homing CE networking, which of the following statements about the VPN are true?

A. RDs in the VPN instances configured on PE 2a and PE 2b must be the same.

B. RDs in the VPN instances configured on PE 2a and PE 2b may be different.

C. RTs in the VPN instances configured on PE 2a and PE 2b must be the same.

D. RTs in the VPN instances configured on PE 2a and PE 2b may be different

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

A. Split horizon

B. Poison reverse

C. Spanning tree algorithm

D. Full-meshed PEs

Which statement about the MPLS LSP traceroute is true?

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

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

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

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