H12-224 : HCNP-R&S Fast Track (Huawei Certified Network Professional – Routing & Switching Fast Track) : Part 19
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By default, the cost of an OSPF interface is related to interface bandwidth. The algorithm for calculating the cost is: bandwidth-reference/bandwidth.
- True
- False
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Which statements about OSPF packets are true? (Choose three.)
- Hello packets can be sent after OSPF is enabled on an interface.
- LS Request packets are sent only after an adjacency is established.
- LS Update packets contain detailed LSA information for LSDB synchronization.
- LS Update packets are sent only after an adjacency is established.
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How many hosts are available per subnet if apply a /21 mask to the class B network?
- 510
- 512
- 1022
- 2046
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OSPF supports the combination of a group of network segments. Such a group is also called an area. In other words, an area is a set of network segments.
- True
- False
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Which of the following statements about route summary are true? (Choose two.)
- Advertise is the default parameter of the abr-summary command. If neither advertise nor not-advertise is specified in the abr-summary command, advertise is used.
- Not-advertise is the default parameter of the abr-summary command. If neither advertise nor not-advertise is specified in the abr-summary command, not-advertise is used.
- The abr-summary command is run in the OSPF view.
- The asbr-summary command is run in the OSPF view.
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Which of the following statements about a Smart Link group are true? (Choose three.)
- 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.
- Of the two interfaces in a Smart Link group, one is active, and the other is standby.
- When an active interface goes Down, the Smart Link group automatically blocks it and changes the status of the standby interface to active.
- When an active interface recovers, the standby interface is blocked and traffic is switched back to the active interface.
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Which of the following statements are correct regarding how OSPF detects old and duplicate LSAs? (Choose three.)
- The smaller the sequence number, the more recent the LSA.
- The smaller the LS age, the more recent the LSA.
- When router generates a new LSA at the first time, it will use 0x80000001 as the sequence number.
- An LSA can be flushed from routing domain by setting its LSA age to Maxage.
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Which of the following statements is false?
- A Router-LSA is used to describe the local link status information of a router.
- A Network-LSA is used to describe the link status information of a broadcast network or an NBMA network segment.
- A virtual link is a virtual adjacency in the backbone area (Area 0).
- An AS-External-LSA describes how to reach an ASBR.
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What is the network address for 190.233.27.13/16?
- 190.0.0.0
- 190.233.0.0
- 190.233.27.0
- 190.233.27.1
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Which of the following statements about BFD control packets are true? (Choose three.)
- A BFD control packet is encapsulated in a UDP packet for transmission. Authentication fields in a BFD control packet are optional.
- BFD detection is not available in VRP 5.7.
- Echo packets use UDP destination port number 3784.
- Echo packets use UDP destination port number 3785.
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Which of the following elements together uniquely identify a LSA? (Choose three.)
- LS type
- Link state ID
- Advertising Router
- LS Sequence number
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The address space 172.28.100.0/24 is currently used. If the subnet mask 172.28.100.0/30 is used to divide this address space into several subnets serving WAN links, how many subnets in total can the address space be divided into?
- 30
- 64
- 126
- 254
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An OSPF neighbor relationship fails to be established and the display ospf error command output is as follows.
H12-224 HCNP-R&S Fast Track (Huawei Certified Network Professional – Routing & Switching Fast Track) Part 19 Q13 022 Which of the following is the possible cause?
- Router IDs conflict.
- Area IDs are mismatched.
- Network masks are inconsistent.
- Authentication types are inconsistent.
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OSPF supports two authentication modes: area authentication and interface authentication.
The two authentication modes cannot be configured at the same time.
- True
- False
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A Router ID is optional in the OSPF configuration.
- True
- False
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Which statement about OSPF is false?
- Hello packets are used to discover and maintain neighbor relationships. On a broadcast network or an NBMA network, Hello packets can also be used to elect a DR and a BDR.
- DD packets describe summary LSDB information by carrying LSA headers.
- The intervals at which two routers send Hello packets must be consistent; otherwise, a neighbor relationship cannot be established between them.
- DD packets contain headers of all LSAs for periodic LSDB synchronization between OSPF neighbors.
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A device can be assigned an IP address 192.168.13.175, with the mask being 255.255.255.240.
- True
- False
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Which of the following statements about OSPF authentication are false? (Choose two.)
- Entering a password in cipher text is allowed.
- The ospf authentication-mode md5 1 huawei command and the ospf authentication-mode md5 1 plain huawei command have the same function.
- If passwords are configured for both an area and an interface, the password configured for the area is used.
- The ospf authentication-mode simple huawei command and the ospf authentication-mode simple plain Huawei command have the same function.
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Which of the following rules should a network administrator obey when the network administrator uses the VLSM technology to plan subnets? (Choose three.)
- A subnet is composed of all summarized routes.
- A subnet can address a host or be further subnetted.
- The Update message of a routing protocol in use must carry subnet mask information.
- The summarized networks must have the same high-order bit.
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For network segment 192.168.2.16/28, how many hosts it can hold at most?
- 16
- 8
- 15
- 14
- 7
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