VLAN Pool has two algorithms for allocating VLANs, namely sequential allocation and HASH allocation.
Which of the following descriptions of these two algorithms are correct? (Multiple choice)

• A.When the sequential allocation algorithm is set, IP addresses may change when users go online or offline.
• B.When the HASH allocation algorithm is set, it may lead to uneven division of users between VLANs.
• C.When the HASH allocation algorithm is set, VLAN changes will not occur when users go online and offline.
• D.When the sequential allocation algorithm is set, VLAN changes may occur when users go online and offline.

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Which of the following descriptions of the BGP Local_Preference attribute are correct? (Multiple choice)

• A.The default value of Local_Preference is 100
• B.You can modify the default Local_Preference value through the bgp default local-preference command.
• C.You can use the Import direction policy on the AS border router to modify the Local_Preference attribute value.
• D.The Local_Preference attribute can be passed between IBGP peers and EBGP peers.

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A wide area network (WAN) is a remote network that connects local area networks (LANs) or metropolitan area networks (MANs) in different areas for communication purposes. It is typically used to interconnect campus networks or data center networks.

• A.TRUE
• B.FALSE

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During routine maintenance, an enterprise administrator runs a command to check VRRP group information.
Which of the following statements is false about the command output?
yaml
CopyEdit
<HUAWEI> display vrrp verbose
Vlanif100 | Virtual Router 1 State: Master
Virtual IP: 10.1.1.100
Master IP: 10.1.1.2
PriorityRun: 120 PriorityConfig: 120
DR: None BDR: None MTU: 0
Preempt: YES Delay Time: 20s
Remain: --
Track: YES Priority Reduced: 20
Auth Type: MD5
BFD-session State: UP

• A.Preemption is enabled for the VRRP group.
• B.This VRRP group is an mVRRP group.
• C.Authentication is enabled for the VRRP group.
• D.The ID of the VRRP group is 1.

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Which of the following VPN technologies operate based on the data link layer? (Multiple choice)

• A.GRE VPN
• B.PPTP VPN
• C.IPsec VPN
• D.L2TP VPN
• E.MPLS VPN

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