HCDP英文版多选题[精华](可编辑)

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1、HCDP英文版多选题精华（可编辑）（文档可以直接使用，也可根据实际需要修改使用 ，可编辑推荐下载）多选题1. Which of the following are characteristics of a high availability network?A Faults seldom occur.B Services can be quickly restored when a fault occurs.C Faults never occur.D Services can only be manually restored when a fault occurs.AB2. Which o

2、f the following statements about BFD control packets are true?A BFD control packet is encapsulated in a UDP packet for transmission.B BFD detection is not available in VRP 5.7C Echo packets use UDP destination port number 3784.D Echo packets use UDP destination port number 3785.ABC3. Which of the fo

3、llowing statements about the BFD asynchronous mode are true?A The local system regularly send BFD control packets,and the remote system detects the BFD control packets sent from the local system.B The local system detects the BFD control packets sent by itself.C If one system does not receive any BF

4、D packets from its peer within a detection period,it advertises a session down event.D Each system confirms its connections with other systems in a particular method.After a BFD seeion is set up, BFD control packets are no longer sent .AC4. Which of the following statements about the BFD demand mode

5、 are true?A The local system regularly send BFD control packets,and the remote system detects the BFD control packets sent from the local systemB The local system detects the BFD control packets sent by itself.C If one system does not receive any BFD packets from its peer within a detection period,i

6、t advertises a session down event.D Each system confirms its connections with other systems in a particular method.After a BFD seeion is set up, BFD control packets are no longer sent .BD5. Which of the following statements about the BFD echo function are true?A The local system sends a series of BF

7、D Echo packets,and the remote system loops the packets back through its forwarding channel.B If the local system does not receive several consecutive Echo packets,it advertises a session down event.C The echo function can work together with the asynchronous or demand detection mode.D The echo functi

8、on can take the place of fault detection by sending BFD control packets. ABCD6. Which of the following statements about a smart link group are true?A Smart link group consists of a maximum of two interfaces,where there are two interfaces,one is an active interface,and the other a standby interface.B

9、 Of the two interface in a smart link group,one is active,and the other is standby.C when an active interface goes down,the Smart link group automatically blocks it and changes the status of the standby interface to active.D when an active interface recovers,the standby interface is blocked and traf

10、fic is switched back to the active interface.ABC7. Which of the following statements about Flush packets in a smart link group are true?A A smart link group sends flush packets to instruct other devices to update the address table.B Flush packets use IEEE 802.3 encapsulation.C The destination MAC ad

11、dress of Fulsh packets is an unknown unicast address,which is used to distinguish protocols.D The destination MAC address of flush packets is a special multicast address,which is used to distinguish protocols.ABC8. When links are switched in a smart link group, which of thefollowing mechanisms can b

12、eused to refresh MAC and ARP entries?A MAC and ARP entries are refreshed automatically with respect to traffic.B The smart link group uses a new link to send flush packets.C MAC entries are refreshed after the aging time expires.D ARP entries are refreshed after the aging time expires.ABC9. Which of

13、 the following statements about link aggregation are true?A link aggregation binds a group of physical interfaces together as a logical interface to increase the bandwidth and reliability.B Link aggregation complies with IEEE 802.3ah.C The logical link formed by bundling multiple physical links toge

14、ther is called a link aggregation group (LAG) or a trunk.D Active and inactive interfaces exist in link aggregation,Active interfaces forward data, whereas inactive interfaces do not.ABCD10. Which of the following statements about link aggregation are true?A Link aggregation can be performed in manu

15、al load balancing or LACP mode.in manual loading balancing mode,LACP is disabled:in LACP mode,LACP is enabled.B In manual load balancing mode,all active member interfaces forward data and perform load balancing.C In static LACP mode,the creation of the Eth-Trunk and the addition of member interfaces

16、 to the Eth-Trunk are perfaormed manually.Compared with link aggregation in manual load balancing mode,active interfaces in static LACP mode are seleted by sending LACP data units(LACPDUs).D Indynamic LACP mode,the creation of the Eth-Trunk,the addition of member interfaces,and the selection of acti

17、ve interfaces are performed based on LACP negotiation. ABCD11. Which of the following statements about LACP are true?A It complies with IEEE 802.3ad.B A device enabled with LACP exchanges link Aggregation Control protocol data Units (LACPDUs) with its peer.C Devices at both ends determine the active

18、 interface according to the interface priority of the active device.ABC12. Which of the following reliability designs are related to routers?A Reliability design of the system and hardwareB Reliability design of the softwareC Reliability test authenticationD Reliability design of the IP networkABCD1

19、3. Which of the following can speed up OSPF fast convergence?A Configuring dynamic BFD for OSPFB Adjusting the interval at which OSPF calculation is performedC Configuring the interval at which an LSA are retransmittedD Configuring the maximum number of external LSAs in the LSDB AB14. When the GR re

20、starter performs the active/standby switchover, the neighbor performs which of the following perations when detecting that a TCP disconnection?A Keeping the routing tables of various address families advertised by the GR Restarter during negotiation,marking entries in these tables with stale tags,an

21、d starting a stale timer. B Starting a restart timer.C Clearing all routing entries and forwarding entries related to the GR restarter if the GR restarter fails to re-establish the BGP connection with the neighbor after the restart timer expires.D Remaining the neighbor relationship unchanged.15. Wh

22、ich of the following statements about the reliability requirement level are true?A Faults seldom occur in the system software or hardware.B System functions are not affected by faults.C System functions are affected by faults but can rapidly recover.D System functions can be ensured by using redunda

23、ncy design,switchover policy,and high success rate in switchover.ABCD16. Which of the following are end-to-end link protection modes?A 1:1B M:NC N:1D 1+1ABD17. On a BGP/MPLSIPv4 VPN,OSPF,LD,aPnd static routes are configured.which of the following protocols need to be enabled with GR to achieve NSF o

24、n PEs?A OSPFB MPLS LDPC BGPD Static routesABC18. Which of the following statements about BFD are true?A It cannot be used to detect MPLS networks.B It provides low-load and short-duration detection for paths between adjacent forwarding engines.C It provides a unified mechanism for detecting all type

25、s of media and BFD-supporting protocols.D It is a bidirectional detection mechanism.BCD19. Which of the following statements about the setup of a BFD session are true?A A BFD session can be set up in either static or dynamic mode.B A static BFD session is set up by manually configuring BFD session p

26、arameters and delivering requests for setting up a BFD session. BFD session parameters include the local and remote discriminators.C A dynamic BFD session is set up by dynamically allocating local discriminators.D Static and dynamic BFD session are not differentiated. ABC20. Which of the following s

27、tatements are correct regarding OSPF Router LSA?A Every router running OSPF must generate Router LSA.B In broadcast and NBMA network,only DROther generates Router LSA.C Router LSA describes link states of the router in area.D Router LSA is flooded in the whole AS.AC21. Which of the following stateme

28、nts are correct regarding Network LSA in OSPF network? A Network LSA is generated by ABR.B only the router which connects NBMA or Broadcast Network may generate network LSA.C DR uses network LSA to describe routers that have established adjacency relation with it in the network.D Network LSA is floo

29、ded in the whole AS.BC22. Which type of LSA is only used to calculate external route?A Type 1B Type 2C Type 3D Type 4E Type 5DE23. Which of the following are OSPF packet type?A LSAB LS requestC LSPD LS UpdateE LS ackBDE24. Which of the following elements together uniquely identify a LSA?A LS typeB L

30、ink state IDC Advertising RouterD LS Sequence numberABC25. Which of the following statements are correct regarding how OSPF detects old and duplicate LSAs?A The smaller the sequence number,the more recent the LSA,B The smaller the LS age,the more recent the LSA.C When router generates a new LSA at t

31、he first time,it will use 0x80000001 as the sequence number.D An LSA can be flushed from routing domain by setting its LSA age to Maxage. BCD26. Which of the following statements are correct regarding intra-area route calculation of OSPF?A Every OSPFrouter only uses one Router LSA to describe local

32、active link state for one area.B Every OSPF uses more than one Router LSA to describe local active link state for one area. C One Router LSA Only describes one linkD One Router LSA describes more than one linkAD27. In OSPF protocol,which of the following elements are used to describe one link?A Link

33、 IDB DataC TypeD MetricABCD28. In OSPF protocol,which of the following elements are used by network LSA to describe broadcast network segment or NBMA network segment?A LINK IDB Net maskC Attached Router listD MetricABC29. Which of the connection types that Router LSA can describe?A Point-to-pointB S

34、tubC transitD Virtual linkABCD30. In OSPF, which of the following statements are incorrect regarding Router LSA generated by Router A?A In point-to-point link type, Data is set to the interface IP address of RouterA.B In TransNet link type,Data is set to the interface IP address of RouterA.C In Stub

35、Net link type,Data is set to the interface IP address of RouterA.D In Virtual link type,Data is set to the Router ID of RouterA.CD31. In OSPF protocol,which of the following elements are used by network LSA to describe broadcast network segment or NBMA network segment?A Link IDB Net maskC Attached R

36、outer listD MetricABC32. Which of the connection types that Router LSA can describe?A Point-to-pointB StubC TransitD Virtual link33. In OSPF area,RTA and RTB interconnect through FE interface.which of the following commands can be used to configure the link cost between RTA and RTB as 10?A Use comme

37、d ospf cost 10 on two routersB Use commed ospf cost 5 on two routersC Use commed bandwidth-reference 500 on two routers to change bandwidth-reference valueD use command bandwidth-reference 1000 on two routers to change bandwidth-referenceAD34. In OSPF protocol,which of the following statements are i

38、ncorrect regarding link ID of Router LSA?A in point-to-point link type,link ID is the neighbor s interface IP address.B In TransNet link type,link ID is the network address of TransNet network segment.C In StubNet link type,link ID is the network address of Stub network.D In virtual link typemlink I

39、D is the neighbor s Router ID of virtual link.AB35. Which of the following statements are correct regarding how OSPF detects old and duplicate LSAs?A The smaller the sequence number,the more recent the LSA.B The smaller the LS age,the more recent the LSA.C When router generates a new LSA at the firs

40、t time.it will use 0x80000001 as the sequence number.D An LSA can be flushed from routing domain by setting its LSA age to Maxage.BCD36. OSPF uses SPF algorithm to calculate SPF tree according to topology.which of the following statements are correct regarding SPF tree node?A The node on SPF tree in

41、dicates router and port.B There are two types of SPF tree node; Transit node and Stub node.C The router node on SPF tree is one type of Stub nodes.D The router node on SPF tree is one type of Transit nodes.BD37. What kind of the BGP attributes does AS-Path attribute belong to ?A MandatoryB Transitiv

42、eC OptionalD Non-transitiveAB38. Which of the following statements are correct regarding BGP attribute?A Till now,there are 16 BGP attributesB BGP attribute can be extended to 256 typesC Well-know discretionary attribute may not be included in each BGP update message,such as Origin attributeD AS_PAT

43、H is an Optional Transitive attributeAB39. Which of the following statements belong to BGP COMMUNTY attribute? A NO_EXPORT B NO_ADVIERTISEC LOCAL_EXPORT_SUBCONFEDD NO_BROADCASTABC40. Which of the BGP attributes are Well-known mandatory attributes? A ORIGINB AS_PATHC NEXT_HOPD MEDE LOCAL_PREFF COMMUN

44、ITYABC41. Which of the attributes must exist in the BGP Update messages? A LOCAL_PREF B NEXT-HOP C ORIGIN D AS_PATHBCD42. Which of the attributes may affect BGP Route Selection?A NEXT_HOPB AS_PATHC LOCAL_PREFD CLUSTER_IDABCD43. Which of the following can be used for BGP route selection?A ACLB IP-PRE

45、FIXC AS-PATH-FILTERD COMMUNITY-FILTER44. Which of the following statements about comparison between ACL and IP-PREFIX are true?A Both ACL and IP-PREFIX can be used for route filteringB Both ACL and IP-PREFIX can be used for data packet filteringC ACL can be used for data packet filtering and route f

46、iltering,but IP-PREFIXcan only be used for route filteringD IP-PREFIXcan be used for data packet filtering and route filtering,but ACL can only be used for route filteringAC45. Which of the following statements about ACL type are true?A ACL consists of basic ACL,advanced ACL and interface-based ACLB

47、 ACL ranging from 2000 to 2999 belongs to advanced ACLC ACL ranging from 3000 to 3999 belongs to advanced ACLD Advanced ACL can be used to match either destination address or source address ACD46. Which of the following can only be used for BGP route selection?A ACLB IP-PREFIXC AS-PATH-FILTERD COMMU

48、NITY-FILTERCD47. Which of the following statements about VLSM characteristics are true?A VLSM supports both IPv4 and IPv6B VLSM supports overlapped address ranges.C VLSM provides more proper route summarization information in the routing table.D VLSM allows a subnet to be divided into smaller subnet

49、s.CD48. Which of the following IP address are network addresses?BD49. What are the advantages of subnet division? A Isolating broadcast traffic B Improving network Qos C Increasing the IP address usage D Improving network reliabilityAC50.BCD51. Which of the following addresses can be used on a publi

50、c network?CD52. Which of the following rules should a network administrator obey when the network administrator uses the VLSM technology to plan subnets?A A subnet is composed of all summarized routes.B A subnet can address a host or be further subnetted.C The update message of a routing protocol in

51、 use must carry subnet mask information.D The summarized networks must have the same high-order bit.BCD53. Which of the following statements about OSPF authentication are false?A Entering a password in cipher text is allowedB The ospf authentication-mode md5 1 huawei command and the ospf authenticat

52、ion-mode md5 1 plain Huawei command have the same function.C If passwords are configured for both an area and an interface,thepassword configuredfor the area is used.D The ospf authentication-mode simple Huawei command and the ospf authentication-mode simple plain Huawei command have the same functi

53、on.BC54. Which of the following statements about route summary are true?A advertise is the default parameter of the abr-summary comman,IF neither advertise nor not-advertise is specified in the abr-summary command,advertise is used.B not-advertise is the default parameter of the abr-summary command,

54、If neither advertise nor not-advertise is specified in the abr-summary command,not-advertise is used.C The abr-summary command is run in the OSPF viewD The asbr-summary command is run in the OSPF view.AD55. What are the OSPF message types?A HelloB Database DescriptionC Link state RequestD Link state

55、 UpdateE Link state AckABCDE56. What are possible causes for a failure in the establishment of an OSPF neighbor relationship?A Router IDs conflictB Area IDs are mismatchedC Network masks are inconsistentD Authentication types and authentication passwords are inconsistentABCD57. Which statements abou

56、t OSPF packets are true?A Hello packets can be sent after OSPF is enabled on an interface.B LS Request packets are sent only after an adjacency is established.C LS Update packets contain detailed LSA information for LSDB synchronization.D LS Update packets are sent only after an adjacency is establi

57、shed.ABC58. Which of the following statements about state transition are true?A The neighbor state machine transitions from the loading state to the full state if a loadingdone event occursB The neighbor state machine transitions from the Exstart state to the Full state if a Negotiationdone event oc

58、cursC The neighbor state machine transitions from the Exchange state to the full state if an Exchangedone event occursD The neighbor state machine transitions from the Exchange state to the loading state if an Exchangedone event occurs.ACD59. Which of the following statements are true?A The neighbor

59、 state machine can transition from the Down state to the attempt stateB The neighbor state machine can transition from the Down state to the init stateC The neighbor state machine can transition from the init state to the Exstart stateD The neighbor state machine can transition from the init state t

60、o the 2-way state ABCD60. Which of the following LSAs are flooded within a single area?A Router LSAB Network LSAC Summary LSAD AS External LSAABC61. Which of the following statements about an AS-External-LSA are true?A The Link State ID field specifies the network segment address for an advertised d

61、estination.B The Advertising Router field specifies the Router ID of an ASBR.C The Net mask field specifies the network mask of an advertised.D The link state ID and Advertising Router fields are used together to uniquely identify an AS-External-LSA.ABC62. Which of the following statements are true?

62、A An LSDB uses a directed graph to show a network topology.The graph contains three elements:routers,Stub networks,and transit network.B A broadcast network or an NBMA network,each having two or more routers,is a Transit network.C The default value of bandwidth-reference is 10M.D The cost of the rou

63、te from a Transit network to an attached router is 0. ABD63. Which of the following statements are false?A An ASBR-Summary-LSA describes the route to an ASBR and is flooded within an AS.B An ASE-LSA describes the route to an external AS and is flooded to an external ASC An AS-External-LSA does not b

64、elong to any specific area.D The metric of a Type-1 external route is the AS external metric only. ABD64. Which parameters are optional for configuring a BGP peer?AIP addressBDescriptionCPasswordDAS-numberBC65.Which types of packets are supported by BGP?AHelloBNotificationCUpdateDRoute-refreshBCD66.Which methods can b