Download Valid H12-821_V1.0-ENU Dumps for Best Preparation
Exam
:
H12-821
Title
: HCIP-Datacom-Core
Technology V1.0
https://www.passcert.com/H12-821_V1.0-ENU.html
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1.There are the following states in the BGP neighbor establishment process, then the state machine
sequence that a successful connection goes through is:
1. Active
2. OpenConfirm
3. Idle
4. Establish
5. OpenSent
A. 3-1-2-5-4
B. 1-3-5-2-4
C. 3-5-1-2-4
D. 3-1-5-2-4
Answer: D
2.As shown in the figure, in the network running the RSTP protocol, the original root port of SWC fails and
the port is in the Down state.
At this time, which of the following processes will the network go through to achieve stability?
A. The standby port on the SWC becomes the new root port and enters the Forwarding state after going
through the Learning state
B. SWC re-elects the root port and directly enters the Forwarding state
C. The standby port on the SWC becomes the new root port and directly enters the Forwarding state
D. SWC re-elects the root port and enters the Forwarding state after Learning
Answer: C
3.About the description about the OSPF calculating the shortest path tree stage, which is the correct?
A. The first stage calculates the Stub network segment, and the second stage calculates the router node
and Transit network segment.
B. The first stage calculates routing nodes and Transit network segments, and the second stage
calculates Stub network segments.
C. The first stage calculates the stub segment, and the second stage calculates the routing node.
D. The first stage calculates the routing nodes, and the second stage calculates the Stub network
segment.
Answer: B
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4.Regarding the description of IGMP Snooping-working mechanism, which is the correct?
A. The layer 2 switch establishes and maintains the PIM routing table on the layer 2 by continuously
monitoring IGMP messages.
B. When IGMP Snooping is not running, the multicast message will be broadcast on the second layer.
After running IGMP Snooping, the message will no longer be broadcast on the second layer, but will be
multicast on the second layer.
C. If the host sends an IGMP leave message, the switch will add the host to the corresponding multicast
table.
D. If the host sends an IGMP host report message, the switch will delete the multicast entry
corresponding to the hos.t
Answer: B
5.What is the minimum total length of the address in IS-IS Byte?
A. 2
B. 8
C. 20
D. 16
Answer: B
6.Which of the following does not include the advantages of address translation technology?
A. Address translation allows internal network users (private IP addresses) to easily access the Internet
B. Address translation can shield users on the internal network and improve the security of the internal
network.
C. Address translation can enable many hosts in the internal office network to share a P address for
accessing the Internet.
D. Address translation can handle the case of IP header encryption
Answer: D
7.Which of the following does not include the switch role in the stack system?
A. Main switch
B. Candidate switch
C. Slave switch
D. Standby switch
Answer: B
8.Which of the following tools is used to filter routing information and set routing attributes for filtered
routing information?
A. route-policy
B. as-path-filter
C. policy-based-route
D. IP-prefix
Answer: A
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9.Regarding the description of the routing tool, which of the following statement is wrong?
A. route-policy can only match routes and data packets, and cannot be used to modify routing attributes
or data packet forwarding behavior
B. Prefix list (ip-prefix) matching object is the destination address of routing information
C. The access control list (ACL) is used to match the IP routing information or the address of the data
packet
D. as-path-filter is used to match the AS-PATH attribute in BGP routing information, so it can only be
used to filter BGP routes
Answer: A
10.Which of the following descriptions about setting Community through routing policies to affect routing
selection is wrong?
A. It can be indirectly affected. By setting the Community attribute of the route, the route can be classified,
and then set different route selection-related attributes according to the category, such
as Local_Pre, MED, etc., to achieve the purpose of affecting route selection
B. It cannot be affected, because the Community attribute of the route is a non-transitional attribute and
cannot be passed between routers
C. It can be affected indirectly. By setting the Community attribute of the route, the route can be classified,
and then different attributes related to route selection can be set according to the category. These
attributes only include Loacal_Pre and MED, so as to achieve the purpose of affecting route selection
D. After the router receives the routing update whose Commmity attribute is No_ Advertise, it will not
advertise it outside the local AS.
Answer: A
11.Regarding the description of the summary automatic command and BGP aggregation, which is
wrong?
A. This command is used to implement automatic aggregation, and its priority is higher than manual
aggregation
B. After configuring this command, BGP will aggregate routes according to natural network segments
C. This command is used to enable automatic aggregation of locally imported routes
D. After configuring this command, BGP only sends the aggregated route to the peer
Answer: A
12.There is a message in the BGP protocol that is periodically sent between BGP neighbors to maintain
the neighbor relationship.
This message is:
A. Update
B. Hello
C. open
D. Keepalive
Answer: D
13.Which BGP route will send BGP neighbors without BGP path load sharing enabled?
A. All BGP routes learned from all neighbors
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B. Only the best route preferred by BGP
C. Only routes learned from IBGP
D. Only routes learned from EBGP
Answer: B
14.When using authentication in BGP configuration, how should it be configured?
A. A pair of BGP peers must use the same MD5 password
B. All routers in the AS must use the same password
C. All BGP peers on a router must use the same password
D. All routers in the same AS must use the same password
Answer: A
15.Which of the following descriptions about the Keepalive message in BGP is wrong?
A. Keepalive messages are mainly used to maintain the connection between BGP peers
B. The Keepalive message contains only one BGP data header
C. By default, the Keepalive interval is 180 seconds
D. Keepalive messages are periodically sent between two BGP neighbors
Answer: C
16.When a stateful inspection firewall forwards subsequent data packets (not the first packet), which of
the following is mainly based on?
A. Route table
B. OFIB table
C. MAC address table
D. Session table
Answer: D
17.ACL command ac1 [number] ac1-number [ match-order {autol config}], where ac1-numnbe is used to
specify the number of the access control list, and the value range of ac1-number of the basic access
control list is ().
A. 1000~3999
B. 0~1000
C. 3000~3999
D. 2000 ~2999
Answer: D
18.Which of the following tools cannot be directly referenced by the apply clause of a route-policy?
A. IP-Prefix
B. tag
C. community
D. origin
Answer: A
19.Regarding the default routes of each protocol, which of the following description is wrong?
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A. BGP can deliver default routes
B. ISIS can issue default routes
C. OSPF cannot deliver the default route
D. Static default routing can be configured
Answer: C
20.In a broadcast network, what is the default interval for sending Hello by DIS?
A. 5s
B. 10s
C. 40s
D. 3.3s
Answer: D
21.Regarding LSA3, LSA4 and LSA5, which of the following description is correct?
A. LSA5 will not change after passing through different areas, but LSA3 will change
B. LSA3, LSA4 and LSA5 will not change after passing through different areas
C. LSA3 will not change after passing through different areas, but LSA4 and LSA5 will change
D. LSA4 will not change after passing through different areas, but LSA3 and LSA5 will change
Answer: A
22.Which of the following description about OSPF is correct?
A. OSPF LSA is regularly updated every 30 minutes
B. OSPF floods an LSU every 5s
C. OSPF uses the Bellman-Ford algorithm, and each router runs the algorithm independently
D. OSPF itself has no confirmation mechanism, so 0SPP relies on the lower layer protocol,
namely TCP confirmation.
Answer: A
23.Among the matters needing attention in configuring the Stub area, the correct description is:
A. The virtual connection can pass through the stub area
B. If an area is configured as a Stub area, all routers in the area must be configured with Stub area
attributes
C. The backbone area can be configured as a stub area
D. ASBR can exist in the Stub area
Answer: B
24.Which of the following scenarios is the SD-WAN solution suitable for?
A. Enterprise branch interconnection
B. Internal interconnection of enterprise data center network
C. Enterprise campus wireless network deployment
Answer: A
25.Which of the following descriptions about OSPF route aggregation is incorrect?
A. Any router in OSPF can perform route aggregation operations.
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B. OSPF has two route aggregation methods: ABR aggregation and ASBR aggregation
C. Route aggregation refers to aggregating routing information with the same prefix and publishing only
one route to other areas.
D. Through route aggregation, routing information can be reduced, thereby reducing the size of the
routing table and improving router performance.
Answer: A
26. Which of the following description of how to establish a BFD session is wrong?
A. BFD sessions can only be established dynamically
B. Static configuration of the BFD session refers to configuring the BFD session parameters through the
command line, including local identifiers and remote identifiers, etc.
C. When dynamically establishing a BFD session, dynamically assign a local identifier.
D. The system distinguishes between static BFD sessions and dynamic BFD sessions by dividing the
identifier area.
Answer: A
27.During the operation of the DHCP protocol, the process from when the client applies to obtain an IP
address is:
① The host sends a DHCP Request to request an IP address
② Server sends DHCP Offer message response
③ The host sends a DHCP Discover message to find DHCP
④ Server 4 Server responds with ACK response request after receiving the request
A. ③-②-①-④
B. ①-②-③-④
C. ①-④-③-④
D. ③-④-①-②
Answer: A
28.The filter-policy 2000 export is configured in the IS-IS process server-group-AP, which statement
about the function of this command is wrong?
A. It needs to be used in combination with route import, so that only part of the imported external routes
can be advertised to neighbors
B. This command will filter the link state information published externally
C. If this command is not configured, the device will advertise all the routes imported to S-IS by the
external routing protocol by default.
D. It will restrict the publishing of routing entries generated by the device itself
Answer: D
29.When performing source NAT configuration and having no-pat configuration parameters, which of the
following statements is correct?
A. Only the destination IP address is translated
B. Simultaneous source IP address and source port translation
C. Only source IP address translation is performed
D. Perform destination IP address and destination port translation
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Answer: C
30.Which of the following description about the prefix list is wrong?
A. The prefix list can match the prefix number and prefix length
B. The prefix list can be used for packet filtering
C. The prefix list can be used to filter IP prefixes
D. The prefix list has a stronger matching function for routing masks than the access control list
Answer: B
31.In SSM, which version of IGMP needs to be used?
A. IGMPv1
B. IGMPv3
C. IGMPv2
D. IGMPv4
Answer: B
32. Which of the following descriptions about configuring roaming groups is wrong?
A. After the AC is enabled with the Master Controller function, it joins the roaming group by default and
can manage other ACs
B. Master Controller is a logical role that can be assumed by any common entity AC
C. Member ACs need to designate an AC as their own Master Controller
D. The Master Controller manages each AC through the CAPWAP tunnel
Answer: A
33.Which of the following description of OSPF neighbor relationship and adjacency relationship is
correct?
A. The adjacency relationship is maintained by OSPF DD packets
B. OSPF routers must establish an adjacency before exchanging Hello packets
C. The neighbor relationship is selected from the adjacency relationship and formed to exchange routing
information
D. Not all neighbor relationships can be adjacencies
Answer: D
34.Which of the following does not belong to IGP?
A. RIP
B. IS-IS
C. BGP
D. OSPF
Answer: C
35.What are the key components of building an IP wide-area bearer network solution together with
Huawei NetEngine intelligent routers?
A. iMaster NCE-Fabric
B. iMaster NCE-IP
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C. iMaster NCE-Campus
D. iMaster NCE-WAN
Answer: D
36.Which of the following statements about the address used by AC to establish a CAPWAP tunnel
in VRRP hot backup is correct?
A. The physical address of the primary AC
B. The physical address of the standby MC
C. Any address configured in the AC is fine
D. VRRP virtual addresses of the active and standby ACs
Answer: D
37.The default priority of the VRRP device in the backup group is:
A. 0
B. 200
C. 150
D. 100
Answer: D
38.In the IS-IS broadcast network, which multicast MAC address does the Level-1 router use as the
destination address for sending IIH?
A. 0180-c200-0000
B. 0180-c200-0015
C. 0100-5E00-0001
D. 0180-c200-0014
Answer: D
39.Which of the following statements about OSPF protocol packets is wrong?
A. The header format of all OSPF packets is the same
B. All OSPF packet headers carry the Router-ID field
C. The OSPF protocol uses five types of packets to complete the transfer of routing information
D. OSPF packets are encapsulated in UDP packets, and the port number is 89
Answer: D
40.Regarding the ABR in OSPF, which is the wrong description?
A. ABR cannot generate Type 3, Type 4, and Type 5 LSAs
B. Convert the Type 1 and Type 2 LSAs in the connected non-bone thousand areas into Type
3 LSAs and publish them to the backbone area
C. The Type 1, Type 2, and Type 3 LSAs in the backbone area of the ABR grid are converted into Type
3 LSAs and advertised to the connected non-bone thousand areas
D. There are multiple LSDBs on the ABR, and the ABR maintains an LSDB for each area
Answer: A
41.Which of the following descriptions about OSPF default routing is wrong?
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A. The OSPF default route can be issued by the Area Border Router (ABR) to issue
Type 3 default LSAs to guide routers in the area to forward packets between areas
B. When the router has no exact matching route, it can forward the message through the default route
C. Due to the hierarchical management of OSPF routes, the priority of class 5 and class 7 default routes
is higher than that of class 3 default routes
D. Autonomous System Boundary Router (ASBR) publishes default LSA of type 5 or default LSA of
type 7, which is used to guide routes in the autonomous system (AS) to access the outside of the
autonomous system
Answer: D
42.Regarding the description of LSA header information in OSPF AS -External – LSA, which is wrong?
A. Link State ID indicates the destination network address
B. Forwarding Address is always 0.0.0.0
C. Advertising Router indicates the Router ID of ASBR
D. Net mask indicates the network mask of the destination network segment
Answer: B
43.Which function does the switch control plane not include?
A. Business processing
B. Routing operation
C. System loading
D. Traffic Statistics
Answer: C
44.By default, on a router running IS-IS in a broadcast network, how many seconds
does DIS send CSNP messages?
A. 10
B. 3.3
C. 30
D. 40
Answer: A
45.The MAC address of a certain PC is 5489-98FB-65D8. The administrator wants this PC to obtain the
specified IP address 192.168.1.11/24 from the DHCP server, so the command configured by the
administrator should be?
A. dhcp static-bind ip-address 192.168.1.11 24 mac-address 5489-98FB-65D8
B. dhcp server static-bind ip-address 192.168.1.11 mac-address 5489-98FB-65D8
C. dhcp server static-bind ip-address 192.168.1.11 255.255.255.0 mac-address 5489-98FB-65D8
D. dhcp static-bind ip-address 192.168.1.11 mac-address 5489-98FB-65D8
Answer: B
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