Make success possible with our Latest and Unique HCIE-Datacom H12-891_V1.0 Practice Exam!
Name: HCIE-Datacom V1.0
Exam Code: H12-891_V1.0
Certification: HCIE-Datacom
Vendor: Huawei
Total Questions: 275
Last Updated: April 24, 2025
293 Satisfied Customers
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View the IGMP configuration of the interface on the router RTA as follows, and the
information about the operation of the RTA is incorrect
A. The packet interval for a particular group query is 60 seconds
B. The interface IP address is 1921681.1
C. The maximum response time for query messages is 10 seconds
D. The IGMP protocol version is 2
ANSWER : A
ISIS does not send CSNP packets under the P2P network type during the neighbor establishment process.
A. True
B. False
ANSWER : B
The network administrator is ready to use the 6to4 automatic tunnel to carry IPv6 data on the IPv4 network, and the IPv4 address of the router interface is 1381485210, so the corresponding tunnel address is 2001:8a0e:55d2:1:230:65ff:fe2:9a6?
A. True
B. False
ANSWER : B
You need to access the subnets of different VPNs in the VXLAN network , such as information about one subnet Bottom: RT=10:1ORT.100:1000 Export 1000 in EVPN instance and RT-100-100 in VPN instance. Which of the following can be basketed for another subnet?
A. All EVPN instances are 1000:1000
B. In VPN instances, it is 10:10
C. 1000:1000 appears in VPN instances
D. EVPN implements 1000:1000 export
ANSWER : C,D
BGP can only automatically aggregate routes whose source is Incomplete.
A. True
B. False
ANSWER : A
Which is the correct description of optimal routing election for each protocol in the following options?( Radio).
A. Route entries in BGP that are unreachable for the next hop are also placed in the IP routing table. In the
B. BGP protocol, the best route to reach the same destination circumference is selected by comparing the cost values of the route entries.
C. The OSPF protocol puts all the routing information in the LSDB into the IP routing table.
D. From BGP and OSPF, different route entries to reach the same destination segment are learned, and the optimal route is selected to join the IP route table by comparing the protocol's preference value .
ANSWER : D
D Class IP address range 239000-239255255,What does 255 do? Radio
A. SSM multicast address, the multicast address segment is valid for the whole network
B. Any legitimate multicast traffic and multicast application can adopt this address
C. Locally managed multicast address, which is valid only locally C. Link-local multicast address, where traffic that uses that address includes network control messages and that address range is only the multicast address segment used by the E. routing protocol
ANSWER : C
A. VPN routing information can be exchanged between A. CE and PE using BGP
messages
B. When Hub-CE passes routing information with Hub-PE, you need to configure a route
on Hub-PE that allows receiving AS numbers to be repeated 1 time to receive routes
published by Hub-CE
C. Between Hub-CE and Hub-PE, and between Spoke-PE and Plan-CE, routing information can be exchanged using the OSPF protocol
D. An MP-IBGP peer relationship is established between Spoke-PE and THE VPN routing information is exchanged.
ANSWER : D
Configuring filter-policy 2000 export in the IS-IS process, the wrong statement about the function of the command is ?
A. which needs to be used in conjunction with route ingestion, acts as an external route sender neighbor that only partially introduces.
B. If you do not configure this command, the device will by default introduce the external routing protocol to the IS-IS route all outgoing
C. Restricts the external publication of route entries generated by the device itself
D. This command will filter the link status information released to the outside world
ANSWER : D
Configure queue-based traffic shaping, which defaults to tailing if the queue length exceeds the cache size
A. True
B. False
ANSWER : A
The MAC address of a PC is 5489-98FB-65D8 The administrator wants this PC to get the specified P address 1921681.11/24 from the DHCP server So the administrator-configured command should be,
A. dhcp static-bind ip address 1921681.11 mac- address 5489-98FB-65D8
B. dhcp static-bind ip address 1921681.11 24 mac- address 5489-98FB-65D8
C. dhcp server static -bind ip address 1921681.112552552550 mac-address 5489-98FB65D8
D. dhcp server static-bind ip-address 1921681. 11 mac- address 5489-98FB-65D8
ANSWER : D
Which of the following is the benefit of VLAN aggregation?
A. Implements isolation of broadcast domains between Sub-VLANs
B. Reduce the waste of IP addresses
C. Increased number of available VLANs
D. Increased flexibility in addressing
ANSWER : A,B,D
Regarding the sliding window of TCP, what are the following descriptions that are enough to be wrong? ( Multiple choice question)
A. The sender declares the initial window size
B. The sender does not need to transmit messages of full window size
C. The TCP sliding window allows multiple packets to be sent before an acknowledgment is received
D. After the retransmission timer times out, the sender has not received an acknowledgment and will retransmit unacknowledged data
E. The receiver needs to acknowledge the sender's packet F. Sliding window size can only be increased or remain unchanged
ANSWER : A,F
The following statements about the VRRP protocol are correct (multiple choice).
A. Both VRRPv2 and VRRPv3 support authentication
B. VRRPv3 does not support authentication, while VRRPV2 does
C. VRRPv2 only applies to IPv4 networks, and VRRPv3 only applies to IPv6 networks
D. The owner of the Master IP address has a VRP priority of 255, and all configurable priorities range from 0 to 254
ANSWER : B
The following statement about the VXLAN gateway is incorrect?( Single choice questions).
A. Layer 2 gateway: Used to solve the problem of tenant access to the VXLAN virtual network, and can also be used for subnet communication of the same VXLAN virtual network.
B. Layer 3 gateway: Used for cross-subnet communication of the VXLAN virtual network and access to external networks.
C. VXLAN Layer 3 gateways can be divided into centralized gateways and distributed gateways.
D. Layer 2 gateway and VPN instance binding.
ANSWER : D
Which of the following BGP attributes is not required in the Update message for a BGP route?
A. WITH
B. Local-Preference
C. AS_PATH
D. Origin
ANSWER : A,B
The following description of BGP loop protection is correct: multi-selec
A. Any routing information from an IBGP peer is advertised to the other IBGP peers
B. Any update information received from the EBGP peer that contains its own AS number in the AS-PATH attribute is discarded via the AS-PATH attribute
C. Non-RR BGP routers do not announce any updates from IBGP peers to other IBGP peers
D. BGP routers do not announce any slaves The EBGP peer comes to update the information to its EBGP peer
ANSWER : B,C
In the VXLAN implementation, the mapping relationship between VNI and BD is
A. 1:N
B. N:1
C. 1:1
D. N: M
ANSWER : C
As shown in the figure, a company sets up an OSPF network. The links in the figure all
form OSPF adjacencies, and all OSFP devices declare their own loopback addresses. One
day SIR2 The two links of the S2AR1 suddenly failed, and in order to detect if the network
was operating properly, the engineers performed a device status check, which is correct as
described below
A. R5 can normally learn the loopback route to R2
B. R3 can not learn the loopback route to R2
C. R1 can normally learn the loopback route
D. R3 of R2 The loopback route of R2 can be learned normally
ANSWER : A,B
What designs in the router can improve the reliability of the router?
A. Dual power supply design
B. Module hot-swappable design
C. Issu Design
D. Dual-engine design
ANSWER : A,D
The following statement about the security alliance SA in IPSec is incorrect
A. 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)
B. Use the display ipsec command to view the encryption algorithm used with another IPSec peer, the traffic of interest, and so on.
C. IPSec only supports encrypting data using symmetric encryption algorithms.
D. A two-way SA must exist between IPSec peers to establish an IPSec VPN connection
ANSWER : A
Level-1-2IS transmits Level-2LSP to the Level-1 area if the AT location 1 in Level-2LSP is delivered It means that the Level-1lS in the area can be accessed to the outer area through Level-1-2IlS
A. True
B. False
ANSWER : B
A. True
B. False
ANSWER : A
If the topology of the entire network does not change, but the allocation of IP segments in the router changes, ISIS only uses PRC to calculate the changed routing information, and does not recalculate all SPT
A. True
B. False
ANSWER : A
Is the following correct statement for the VXLAN message?
A. The outer destination IP address is the IP address of the VTEP at the far end of the VXLAN tunnel
B. The source UDP port number is 4789
C. The destination UDP port number is 4789
D. VNI has 24 T bits to distinguish the VIAN segment
ANSWER : A,C,D
As shown in the figure, all routing diagrams declare the loopback address in OSPF, where R2 does not return the address is 10022/32, it is advisable to tell AraD. The R3 loopback address is 10033/321001.1.0/24 external routing, in order to reduce the burden on the RI router, the configuration command is as follows:( Multiple choice questions)[Rlip ip-prefix 1 permit 001.1.024 [RLIJospfl [RL-ospf-1]filter-policy ip-prefix l import please ask the following description is correct?
A. In the P route table of router R1, there is no external route to 1001.1.0/24
B. In the IP routing table of router R1, there is an external route to 1001.1.0/24
C. In the IP routing table of router R1, there is no loopback route to R2
D. In the IP routing table of router RI, there is no loopback route to R3
ANSWER : A,C,D
What check frames can IPSG set?
A. Out of the interface
B. MAC address
C. IP address
D. VLAN ID
ANSWER : B,C,D
A???:import Target:12:3EpodTarget:12:3
B. Headquarters: importTarget:1:1EpodTarget:3:3
C. Headquarters: Impot Target:2:2; Expor Target:3:3
D. Headquarters: importTarget: 12:3EpodTarget: 3:12
ANSWER : D
Unlike STP, RSTP has only one BPDU type, its value is 2, and there is no TCN BPDU.
A. TRUE
B. FALSE
ANSWER : A
The means of the LAND attack is that the attacker sends an SVN packet message with the same source and destination addresses to the target host, the source port and the destination port are the same, and the receiver waits for the final ACK packet to be sent , the connection is always in a semi-connected state, resulting in a full limited TCP reception Waste of resources
A. True
B. False
ANSWER : A
To achieve an on-machine migration in the BGP EVPN distributed gateway scenario, which of the following messages is required?
A. Type5
B. Type4
C. Typel
D. Type2
E. Type3
ANSWER : D
What is the following description of MPLS BGPVPN incorrect?
A. The TTL field in the label has the effect of preventing loops.
B. IBGP PEes generally use the Loopback interface address to establish a stable BGP neighbor relationship
C. BGP So0, which is used to prevent routes issued from a VPN site from passing through the MPLS backbone and back to that site. So0 is an extended group attribute that MP-BGP automatically generates.
D. The routing exchange between D. PE-CE can be static routing, OSPF multi-instance, ISIS multi-instance, EBGP
ANSWER : C
When you deploy LLQ, you need to configure bandwidth parameters, what is the significance of bandwidth parameters?( Single choice questions).
A. Provides a built-in policer to limit the maximum available bandwidth of a low-latency queue during congestion
B. The parameter should be as small as possible. It means that the bandwidth is always preserved, and even if the LLQ is set, changing the parameters will reduce the available bandwidth of the interface
C. It represents a reference CIR to calculate the burst size D of the built-in tactician token bucket Changing parameters is an option because LLQ always takes precedence over other queues
ANSWER : A
What categories can ACLs be divided into?
A. Advanced ACLs
B. Two-layer ACL
C. User-defined ACLs
D. Basic ACL
ANSWER : A,B,C,D
The CPU was attacked by malicious traffic. Here are some of the following ways to prevent an attack: Multi-select
A. USE CPCAR to rate limit messages sent up to the CPU according to the protocol type
B. Speed limiting of messages sent to the CPu on the soil.
C. Filter packets with AcL on the compromised router port
D. Turn off the remote login function of the router.
E. Analyze and count the packets sent to the CPU to find out the user of the attack source or the interface of the attack source.
ANSWER : C,D
A. The 2::/64 route appears in the P route table
B. The 2019:/64 route appears in the IP routing table
C. 2020::/64 The route appears in the IP routing table
D. The 2021/64 route will appear in the IP routing table
ANSWER : A,B,C,D
Regarding how the device handles messages in the MPLS network model, what is the following description of the error?
A. The label forwarding path LSP is determined and established by various protocols during the forwarding of messages. There is certainly no stripping of the label on the
B. LSR. Both
C. LER and LSR are labeled.
D. For IP packets entering the MPLS domain, the device discards them.
ANSWER : A
If the OSPP protocol is running in the network , after configuring the non-backbone area in the OSPP area as the Totally Stub region, the ABR router sends a message to Totally. The Stub region issues an LSA with an LS ID of 0000, and what type of LSA is the LAS to?
A. LSA5
B. LSA2
C. LSA1
D. LSA3
ANSWER : D
The following statement about the VPNv4 address is wrongly described as ?
A. By default, PE does not perform VPN-target filtering on received VPNv4 routes.
B. Local PE sets up An Export Target for these routes before releasing VPNv4 routes learned from sites that are directly connected to them to other PEEs attributes, and are published with routes as extended community attributes for BGP.
C. Carries the RD attribute when BGP publishes both reachable and unreachable VPNv4 routes.
D. The VPNv4 address has a total of 12 bytes, including an 8-byte route identifier RD (Route Distingulisher) and a 4-byte IPv4 Address prefix.
ANSWER : A
The correct statement about the IGMP proxy is ? Multi-select
A. The downstream interface of the IGMP proxy device generates multicast relay table items
B. 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
C. IGMP proxy is typically deployed on devices between hosts that are members of the access device The
D. IGMP proxy device cannot send query messages to downstream member hosts in place of the IGMP queryer to maintain group membership
ANSWER : A,B,C
If a router only needs to forward iPv6 packets, you do not need to configure any IPV4 agreements and addresses on that router.
A. True
B. False
ANSWER : A
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