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H3C GB0-372-ENU Exam Syllabus Topics:

Section	Weight	Objectives
VLAN Technologies	20%	- VLAN fundamentals and configuration - Trunk, Hybrid and Access ports - QinQ technology and application - VLAN routing and Inter-VLAN communication
Campus Network Overview	10%	- Hierarchical network model - Campus network architecture and design principles
Spanning Tree Protocols	20%	- STP, RSTP and MSTP principles - Root bridge and port roles election - MSTP configuration and optimization - Bridge protocol data units (BPDU)
Advanced Switching Features	20%	- Layer 3 switching and routing protocols - Port security and traffic control - DHCP relay and snooping - Switch management and monitoring
High Availability Technologies	15%	- VRRP protocol and deployment - Link aggregation (LACP and static mode) - Device redundancy and failover
IP Multicast	15%	- Multicast concepts and addressing - IGMP protocol versions and operation - PIM-DM and PIM-SM basics

H3CSE-RS-SW Sample Questions:

1. In the switching network shown in the figure, VLAN10 is set as Private VLAN on switch SWA, VLAN2 and VLAN3 are Secondary VLAN of VLAN10, VLAN2-VLAN20 is set on switch SWB, and VLAN20 is set as Private VLAN, and VLAN4 is Secondary VLAN of VLAN20. After setting the IP addresses of each device as shown in the figure, which of the following is correct for the communication between PCA and PCB?

A) PCA can communicate directly with PCB without additional configuration
B) The local proxy ARP function needs to be enabled in the VLAN20 view of SWB so that PCA can communicate with PCB.
C) You need to enable the local proxy ARP function in the VLAN10 view of SWA so that PCA can communicate with PCB.
D) The local proxy ARP function needs to be enabled in the VLAN10 virtual interface view of SWA so that PCA can communicate with PCB.
E You need to enable the local proxy ARP function in the VIAN20 virtual interface view of SWB so that PCA can communicate with PCB.

2. Which of the following statements about PIM SM is correct? (Multiple choice)

A) RP will forward multicast traffic downstream only after receiving multicast data forwarded by the multicast source
B) Upon receiving a registration message from a multicast source, the RP sends a join message to the multicast source and generates an (S, G) entry only when it receives normal multicast traffic from the multicast source.
C) When a multicast source initially sends traffic, an (S, G) entry is formed on the DR connected to it.
D) Before the multicast traffic is forwarded from the RP to the multicast receiver, all routers along the way have established (*, G) entries.

3. Regarding the priority marking of IP packets, which of the following is correct? (Multiple choice)

A) The TOS field of the current IP packet contains two fields: IP priority and service type, of which IP priority occupies 3 bits.
B) 802.1P priority is divided into 4 levels from 0 to 3
C) DSCP defines four types of network processes, among which the accelerated forwarding EF class is divided into four subclasses EF1/2/3/4
D) 802.1P priority is identified by the prionity field in the VLAN tag

4. The GARP messages used in information exchange between GARP application entities are?
(Multiple choice)

A) Join
B) LeaveAll
C) JoinAll
D) Empty
E) Leave
F) JoinEmpty
G) LeaveEmpty

5. The IP address of host PCA is 40.1.1.1, and the MAC address is 0011.1111.1111. It is connected to the GigabitEthernet1/0/1 port of switch SWA. The following commands are configured on switch SWA:
[SWA] vlan 10
[SWA-vlan10] quit
[SWA] vlan 20
[SWA-vlan20] protocol-vlan ipv4
[SWA-vlan20] quit
[SWA] vlan 30 [SWA-vlan30] quit
[SWA] mac-vlan mac-address 0011-1111-1111 vlan 30
[SWA] vlan 40
[SWA-vlan40] ip-subnet-vlan ip 50.1.1.0 255.255.255.0
[SWA-vlan40] quit
[SWA] interface GigabitEthernet 1/0/1
[SWA-GigabitEthernet1/0/1] port link-type hybrid
[SWA-GigabitEthernet1/0/1] port hybrid pvid vlan 10
[SWA-GigabitEthernet1/0/1] port hybrid vlan 10 20 30 40 untagged
[SWA-GigabitEthernet1/0/1] port hybrid protocol-vlan vlan 20 0
[SWA-GigabitEthernet1/0/1] port hybrid ip-subnet-vlan vlan 40
[SWA-GigabitEthernet1/0/1] mac-vlan enable
[SWA-GigabitEthernet1/0/1] vlan precedence ip-subnet-vlan
After the configuration is complete, can you tell which one the PCA will join?