In different scenarios, RSTP provides different protection functions, and the wrong statement about this statement is

after the BPDU protection function is enabled on the switching device, if the edge port receives RST BPDU, the edge port will be set to a non-remote port and the spanning tree calculation will be re-performed

The root protection feature is enabled for the specified port, and its port role can only remain as the specified port

When the anti-TC-BPDU packet attack feature is enabled, the number of times the switching device processes IC BPDU packets per unit time is configurable

after the BPDU protection function is enabled on the switching device, if the edge port receives RST BPDU, the edge port will be set to a non-remote port and the spanning tree calculation will be re-performed

Start the specified port of root protection, when the port receives a better RSTBPDU, the port will enter the Discarding state and is no longer forwarding packets. If the port does not receive a better RSTBPD for a period of time then automatically revert to the normal Forwarding state

An engineer used 2 routers to test IPv6 services and simulated the interconnection between headquarters and branches by running BGP4+. The network logic topology is shown in the figure, regarding the delivery of IPv6 routes between two devices, which of the following statements is wrong?

When routing is passed, the Next_Hop attribute must be an IPv6 global unicast address

When a route is passed, it carries a recognized mandatory attribute such as AS_Path

BGP4+ passes routing information between peers via Update packet

When routing is passed, the Next_Hop attribute must be an IPv6 global unicast address

If the Update message carries the MP_REACH_NLRI attribute, it means that the advertisement is reachable route

When you deploy BGP/MPLSIPVPN, when two VPNs have a common site, the common site must not use overlapping address spaces with the other sites of the two VPNs. The series description for configuring static lSPs in MPLS networks is correct?

When an LSR is a Transit LSR, you need to configure both In Label and Out label, both in the range of 16-1023

When an LSR is An Egyptian LSR, only in Label needs to be configured, ranging from 16-1023

When an LSR is Ingress LSR, only configure Out Label, which ranges from 16-1048575

When an LSR is a Transit LSR, you need to configure both In Label and Out label, both in the range of 16-1023

When an LSR is TransitLSR, you need to configure both ln Label and Out Label, both of which are 161023 The Out Label ranges from 16 to 1048575

When an LSR is An Egyptian LSR, only in Label needs to be configured, ranging from 16-1023

S-4S supports multi-instance and multi-process, that is, on an IS-IS router, multiple VPN instances can be configured to associate with multiple IS-S processes, the following description of IS-IS multiinstance and multi-process, which are correct ?

If an IS-IS router creates multiple IS-IS processes, each process is independent of each other

1 IS-IS processes can only be associated with 1 VPN instance

1 VPN instances can be associated with several different IS-IS processes

If an IS-IS router creates multiple IS-IS processes, each process is independent of each other

1 IS-IS processes can only be associated with 1 VPN instance

1 IS-IS processes can be associated with several different VPN instances

1 VPN instances can be associated with several different IS-IS processes

Which of the following descriptions of MPLS header TTL are correct?

Can prevent wireless circular forwarding of messages

MPLS has two ways of handling TTL, one is that the IP packet copies the PTTL of the MPLS header hen it enters the MPLS network Value; Another is to set the TTL of the MPLS header to 255 at the entrance LER

Copy IPTIL value is handled in such a way that the LSR of the MPLS domain is hidden, which plays a certain security role

Can prevent wireless circular forwarding of messages

MPLS has two ways of handling TTL, one is that the IP packet copies the PTTL of the MPLS header hen it enters the MPLS network Value; Another is to set the TTL of the MPLS header to 255 at the entrance LER

When copying TTL is disabled, tracert can see the LSR of the passing MPLS domain

Regarding the tag space for MPLS, the description is incorrect

the tag is popped up by default and the message is sent to the last hop

When the penultimate hop LSR performs a label swap, if the swapped tag value is found to be

the tag is popped up by default and the message is sent to the last hop

Above 1024 is the tag space shared by dynamic signaling protocols such as LDP, RSVP-TE, MP-BGP, etc

16-1023 is a label control shared by static LSPs and static CR-LSPs

The following statement about ISIS (IPv6) is correct?

In order to support the processing and calculation of IPV6 routes, IS-IS has added TLV232, 236

IS-IS works at the data link layer and only needs to add a new TLV to support IPv6

To support the processing and computation of IPv6 routes, IS-IS has added NLPID to the 129TLV

In order to support the processing and calculation of IPV6 routes, IS-IS has added TLV232, 236

By default, IS-IS has the multi-topology feature turned on

IS-IS works at the data link layer and only needs to add a new TLV to support IPv6

To support the processing and computation of IPv6 routes, IS-IS has added NLPID to the 129TLV

QinQ technology is a technology that extends the VLAN space by adding a layer of 8021Q tag messages to the extended VLAN. The function of space, the following statement about QInQ is mispronounced?

QinQ increases the number of VLANs to 4095*4095

basic QinQ is implemented based on the interface orientation

QinQ increases the number of VLANs to 4095*4095

Flexible QinQ can be based on different inner layerS Tag and different outer layers of Tag, for user VL The division of AN is more granular

QinQ technology enables private VLANs to pass through the public Network

In an MPLSVPN network, when a packet enters the Internet and is forwarded, it is encapsulated with two layers of MPLS tags, and the processing of the packet in the following options is described correctly?

The penultimate hop device receives packets with an outer label of 3

The Egress PE device correctly sends packets to the appropriate VPN

based on the inner tag The packet pops up the outer label on the penultimate hop device and forwards it to the Egress PE device

The penultimate hop device receives packets with an outer label of 3

The Egress PE appliance receives an UNlabeled IP packet

The Egress PE device correctly sends packets to the appropriate VPN

based on the inner tag The packet pops up the outer label on the penultimate hop device and forwards it to the Egress PE device

0SPFV2 is running on the IPV4 network IGP: OSPF3 is running in the IPV6 network, OSPF35 OSPFV2 has the same message type. Includes hello messages, DOD messages, LSR messages, LAU messages, and SAX messages aboutOSPP The following statement is correct?

OSPFv3 sends OSPFv3 packet using the IPV6 multicast addresses FF02::5 and FF02

The hello packet of OSPFv3 carries the IPV6 address prefix of the router interface

OSPFv3 uses the authentication field of the packet header to complete the packet authentication

OSPFv3 uses the link-local address as the source address for sending packets, which can be forwarded outside the range of the originating link

OSPFv3 sends OSPFv3 packet using the IPV6 multicast addresses FF02::5 and FF02

What is correct about the multicast message forwarding?

The source address of the multicast message is the unicast address

RPF check failure indicates that the multicast data packets are received from a suboptimal interface, but the interface still receives multicast traffic and forwards it downstream

IGMP snooping function can not control the range of multicast traffic in the Ethernet flood

In the multicast transmission mode, the destination address of the message can specify the location of the receiver

The source address of the multicast message is the unicast address

Man-in-the-middle attacks or IP/MAC spoofing attacks can lead to information leakage and other hazards, and are more common in the intranet, in order to prevent man-in-the-middle attacks or IP/MAC spoofing attacks, you can take the configuration method

Configure DHCP snooping on the switch to interbolde with DAI or IPSG

Enable DHCP snooping to check the chaddr field in a DHCP request message

Configure the trusted/untrusted interface

Configure DHCP snooping on the switch to interbolde with DAI or IPSG

Limit the maximum number of MAC addresses allowed to be learned on the switch interface

When the BFD detection intervals on both ends are 30ms and 40ms, are the following options described correctly? An

BFD session can be established, which takes 40ms after negotiation A B. BFD session can be established, which takes 30ms after negotiation

BFD sessions can be established, each occurring at its own interval l D. BFD sessions cannot be established

Regarding the description of the hello message in the PIM-SM message, the error is ?

Hello messages are sent to multicast address 224005

Elect dr in multiple router segments with hello messages

Routers periodically use hello messages to stay in touch

In a PIM-SM network, a newly started multicast router needs to use hello messages to discover neighbors and maintain neighbor relationships

The correct statement about the IGMP proxy is ? Multi-select

The downstream interface of the IGMP proxy device generates multicast relay table items

IGMP proxy can detect the link status with the linkage through the information of the member host joining/leaving the multicast group, and realize the rapid switching of the primary and standby device links

IGMP proxy is typically deployed on devices between hosts that are members of the access device The

The downstream interface of the IGMP proxy device generates multicast relay table items

IGMP proxy can detect the link status with the linkage through the information of the member host joining/leaving the multicast group, and realize the rapid switching of the primary and standby device links

IGMP proxy is typically deployed on devices between hosts that are members of the access device The

IGMP proxy device cannot send query messages to downstream member hosts in place of the IGMP queryer to maintain group membership

The following description of BGP ring protection is correct

BGP routers that are not RR do not announce any updates from the IBGP peer to other IBGP peers

, through the AS-path attribute, discard any update information received from the EBGP peer that contains its own AS number in the AS-path attribute

The BGP router does not announce any updates from the EBGP peer to other EBGP peers

BGP routers that are not RR do not announce any updates from the IBGP peer to other IBGP peers

Any routing information from the IBGP peer is advertised to the other IBGP peers

, through the AS-path attribute, discard any update information received from the EBGP peer that contains its own AS number in the AS-path attribute

Huawei H12-891 Practice Test 12 - Free Online Exam Prep & Questions

IGMP SSMMapping is bound to multicast through a static multicast source, so that members of IGMPv1 and IGMP2 can also access the SSM multicast network. The following statement about IGMPSSMMapping is wrong?( Radio).

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Huawei H12-891 Practice Test 12

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