The following description of BGP loop protection is correct: multi-select

Any update information received from the EBGP peer that contains its own AS number in the ASPATH attribute is discarded via the AS-PATH attribute

Non-RR BGP routers do not announce any updates from IBGP peers to other IBGP peers

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

Any update information received from the EBGP peer that contains its own AS number in the ASPATH attribute is discarded via the AS-PATH attribute

Non-RR BGP routers do not announce any updates from IBGP peers to other IBGP peers

BGP routers do not announce any slaves The EBGP peer comes to update the information to its EBGP peer

The command to configure VRRP preemption delay is ?

vrrp vrid 1 preempt-mode timer delay 20

If a DR needs to be elected between multicast routers running PIM-SM to be responsible for the sending and receiving of source or member multicast data, which one is described correctly below for the DR election rule?

Compare the DR priority first; With the same priority, you need to compare the interface IP addresses of the PIM routers to elect dr

PIM routers with long interface masks are elected dr.

Compare the DR priority first; With the same priority, you need to compare the interface IP addresses of the PIM routers to elect dr

PIM routers with small IP addresses are elected DR. PIM routers with low

DR priority values are elected DR.

In an intra-domain MPLSVPN network, when a packet enters the public network and is forwarded, it is encapsulated with two layers of MPLS tags, and the description of the two layers of tags in the following options is incorrect

The outer label of MPLS VPN is called a private network label, and the inner label is called a public network label

The outer label is used to correctly send packets to the appropriate VPN in

The outer label of mpls VPN is assigned by the LDP protocol or statically, and the inner label is assigned by the MP-BGP neighbor of the peer

The outer label of MPLS VPN is called a private network label, and the inner label is called a public network label

The outer label is used to correctly send packets to the appropriate VPN in

on the PE device By default, the outer label is ejected before the packet is forwarded to the last hop device

The following statement about the security alliance SA in IPSec is incorrect

SA is uniquely identified by a triple that includes the security parametric reference SPI (Security Parameter Inder), the source IP address, and the security protocol number (AH or ESP)

Use the display ipsec command to view the encryption algorithm used with another IPSec peer, the traffic of interest, and so on.

IPSec only supports encrypting data using symmetric encryption algorithms.

A two-way SA must exist between IPSec peers to establish an IPSec VPN connection

The following statement about RSTP root protection is correct?

It is recommended that you turn it on on a switch that is at the edge of the network

After opening the root-protected port and receiving the RSTBPDU with a higher priority, if it does not continue to receive the RSTBPDU with a higher priority for a period of time, it will return to the normal forwarding state

Turning on root protection on the root port takes effect

The port that turns on the root protection receives the RST BDPU with a higher priority and will enter the error-down state

It is recommended that you turn it on on a switch that is at the edge of the network

After opening the root-protected port and receiving the RSTBPDU with a higher priority, if it does not continue to receive the RSTBPDU with a higher priority for a period of time, it will return to the normal forwarding state

IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculations. As shown in the figure, at the same time, a certain area has IPV4 and IPV6 and runs IS-IS to achieve network interconnection, of which R2 only supports IPV4 Regarding the topology calculation of the network, which of the following statements is correct?

By default, in the shortest path tree formed by the IPv6 network calculation, R1 accesses R4 as R1- R2-R4, since R2 does not support IPv6 Therefore, R2 will directly drop the IPv6 packet after receiving it, and select the traffic loss

By default, IPv6 is not supported because R2 Therefore, in the shortest path tree formed by the JPv6 network computation, the path where R1 accesses R4 is: R1-R3-R4

If you want the IPv4 and IPv6 networks to compute the same shortest path tree. The IPv6-enable topology lpv6 command is required to enable the Russian force of IPv6 under the IS-IS process

By default, in the shortest path tree formed by the IPv6 network calculation, R1 accesses R4 as R1- R2-R4, since R2 does not support IPv6 Therefore, R2 will directly drop the IPv6 packet after receiving it, and select the traffic loss

By default, IPv4 and IIPV6 networks are computed separately to form different shortest path trees

Is the following description of the differences between IGMP name versions correct?

IGMPv1 does not support specific group queries, while IGMPv2 does

For members to leave, IGMPv2/v3 can actively leave, while IGMPvl cannot

IGMPv1/v2 cannot elect the queryer itself, while IGMPv3 can

IGMPv1 does not support specific group queries, while IGMPv2 does

IGMPv1/2/v3 cannot support the SSM model

For members to leave, IGMPv2/v3 can actively leave, while IGMPvl cannot

A medium-sized campus network manages the network through the SNMP protocol, and the campus is highly network-safe, so which version of SNMP is recommended for management?

All versions are available to implement

What are the problems with manually creating static VXLAN tunnels in campus networks? Multiselect

Although the static VXLAN tunnel mode can support distributed gateway application scenarios, the configuration workload is large and the configuration adjustment is complex

N devices to establish static VXLAN tunnels, you need to manually configure up to N(N-1)/2 tunnels, the amount of configuration is large

VTEP can only learn remote MAC addresses in a way that relies on data flooding

Although the static VXLAN tunnel mode can support distributed gateway application scenarios, the configuration workload is large and the configuration adjustment is complex

N devices to establish static VXLAN tunnels, you need to manually configure up to N(N-1)/2 tunnels, the amount of configuration is large

VTEP can only learn remote MAC addresses in a way that relies on data flooding

Static VLAN tunnel also uses related protocols on the control plane, which will cause equipment resource loss

In the description of the MAC address spoofing attack, the error is ? Radio

Mac address spoofing attacks cause the switch to learn the wrong mapping of Mac addresses to IP addresses

A MAC address spoofing attack causes the data that the switch is sending to the correct destination to be sent to the attacker

MAC address spoofing attacks primarily exploit the switch Mac address learning mechanism

An attacker can perform a MAC address spoofing attack by sending a forged source Mac address data frame to the switch

The following is a description of how BFD sessions are established, which is the wrong one

Static configuration of BFD session refers to manual configuration of BFD session parameters through the command line, including local identifiers and remote identifiers

The system distinguishes between static BFD sessions and dynamic BPD sessions by dividing the identifier area Dynamically assign this landmark identifier

BFD sessions can only be established dynamically

Static configuration of BFD session refers to manual configuration of BFD session parameters through the command line, including local identifiers and remote identifiers

In the multi-level RR scenario, the first-level RR will be connected to a large number of second-level R, which may cause the BGP circuit of the first-level RR to overflow from the table Risk of R BGP routing table overflow?( Radio).

Route Control C. Route Aggregation

?BGP4+?,Update ????M IP_R EACH_NLRI ?????next hop network address ????? ?

You can carry a link-local address and a global unicast address

It can be just link-local address

Can only be a link-local address

You can carry a link-local address and a global unicast address

at the same time Can only be a global unicast address

The following description of Link ID, Data, Type, and Metirc in Router-LSA is correct :( Multiple select).

Metric describes the overhead of this connection

The Link ID represents the local identity of this connection, and the different connection types The Link ID represents different meanings

Data is used to describe additional information for this connection, and different connection types describe different information

Type indicates the type of connection

Metric describes the overhead of this connection

The Link ID represents the local identity of this connection, and the different connection types The Link ID represents different meanings

Data is used to describe additional information for this connection, and different connection types describe different information

Type indicates the type of connection

The following statement about the IS-IS protocol is incorrect?

The IS-IS protocol is a link-state protocol that runs between AS

The IS-IS protocol supports CLNP networks

Messages for the IS-IS protocol are encapsulated directly by the data link layer

The IS-IS protocol supports IP network ad

The following statement about the OSPFv3 message format is correct?( Multiple select).

Remove the Authentication, Auth Type fields

Hello messages no longer contain address information, carrying Interface lD

The OSPF version number changed from 2 to 3

There is no change in the option field of the Hello message

Remove the Authentication, Auth Type fields

Hello messages no longer contain address information, carrying Interface lD

The OSPF version number changed from 2 to 3

MPLS is called multiprotocol label switching, and with respect to label descriptions in MPLS, the correct one is ?( Multiple select).

The MPLS system has a variety of label publishing protocols, such as LDP is a label publishing protocol

A tag is a fixed-length, locally only meaningful identifier that uniquely identifies the FEC to which a group belongs

MPLS supports single-layer tags as well as multi-tier tags

The MPLS system has a variety of label publishing protocols, such as LDP is a label publishing protocol

The label is carried by the head of the MPLS message and has a global significance, that is, the label value of all routers cannot repeat

A tag is a fixed-length, locally only meaningful identifier that uniquely identifies the FEC to which a group belongs

MPLS supports single-layer tags as well as multi-tier tags

The following description of IGMPv1 and IGMPv2 is correct?( Multiple select).

IGMPv2 message types include member departure packets

IGMPv1 supports universal group queries

The IGMPv1 message type does not contain members leaving the packet AD

IGMPv2 message types include member departure packets

IGMPv2 does not support specific group queries

IGMPv1 supports universal group queries

The IGMPv1 message type does not contain members leaving the packet AD

When configuring the source NAT and having no pat configuration parameters, which of the following statements is true?( Radio)

Only source P address translation occurs

Perform destination IP address and destination port translation

Only source P address translation occurs

Only destination IP address translation occurs

Simultaneous source P address and source port translation

Huawei H12-891 Practice Test 9 - Free Online Exam Prep & Questions

What information does the BGP Open message carry as follows?

BGP Router ID

Route attributes

Local Autonomous System (AS) number

Hold time

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