Huawei Routing & Switching H12-261 Questions & Answers

• Question 31:

  In the aggregate ipv4-address {mask | mask-length} [as-set | attribute-policy route-policy-name1 | detail-suppressed | origin-policy route-policy-name2 | suppress-policy route-policy-name3] command, multiple parameters can be used to affect the BGP summarized route and summarization result. Which of the following statements regarding this command are true?

  A. If the origin-policy parameter is specified, only the specific routes matching route-policy are summarized.

  B. If the attribute-policy parameter is specified, attributes of the summary route can be modified.

  C. If the suppress-policy parameter is specified, a summary route is generated. The if-match clause of the route-policy can be used to filter specific routes to be suppressed. The specific routes matching route-policy are still advertised to other BGP peers.

  D. If the as-set parameter is specified, the AS_Path attribute of the summary route contains AS path information about all specific routes to prevent loops.

  Correct Answer: ABD

• Question 32:

  As shown in the following figure, R1 can connect to the Internet through R2 or R3. EBGP connections are set up between R1 and R2 and between R1 and R3. R2 and R3 reside in the same AS and advertise default routes using BGP. Which of the following methods can be used to enable traffic from R1 to the Internet to be preferentially forwarded by R2?

  

  A. On R2, set the Local_Pref value to 150 in the egress direction of R1

  B. On R1, set the MED attribute value to 150 in the ingress direction of R3

  C. On R1, set the Local_Pref attribute value to 150 in the ingress direction of R2

  D. On R2, set the MED attribute value to 150 in the egress direction of R1

  Correct Answer: C

• Question 33:

  A Huawei router is configured to import a route into OSPF on an enterprise network. Which of the following statements about the LSA generated from the imported route are true?

  A. The Net Mask field is set to all 0s

  B. The Link State ID, and Advertising Router fields can uniquely identify an LSA

  C. The Advertising Router field is set to the ASBR's Router ID

  D. The Link State ID field is set to the destination network segment address

  Correct Answer: B

• Question 34:

  Regular expressions can be used in Community-filter and AS-Path-filter to filter routes.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 35:

  Which of the following statements regarding an OSPF virtual link is true?

  A. A virtual link can be used to solve the problem of a non-continuous Area 0

  B. A virtual link uses the IP address of the outbound interface as the link address

  C. A virtual link can be established in any area, and the virtual link belongs to the area after it is established

  D. A virtual link with a cost of 0 is the optimal link

  Correct Answer: A

• Question 36:

  Which of the following statements regarding MP-BGP is false?

  A. The MP_UNREACH_NLRI attribute of Update packets does not contain path information

  B. MP_REACH_NLRI and MP_UNREACH_NLRI are optional transitive attributes

  C. The complete MP_REACH_NLRI attribute structure contains the address family, next hop, and prefix information

  D. MP-BGP can be used to allocate labels

  Correct Answer: B

• Question 37:

  Which of the following statements regarding OSPFv3 LSAs are true?

  A. The Link State ID of an Inter-Area-Prefix-LSA contains prefix information

  B. Router-LSAs and Network-LSAs do not contain routing information

  C. Inter-Area-Prefix-LSAs contain link-local information

  D. When the Referenced Link State Type of an Intra-Area-Prefix-LSA is 2, the Referenced Link State ID contains the interface ID of the DR

  Correct Answer: D

• Question 38:

  Which of the following statements regarding deploying IS-IS in an IPv6 environment is true?

  A. On a broadcast network, the IPv4 DIS priority and IPv6 DIS priority can be set, respectively.

  B. If the isis silent command is run on an IS-IS interface, the interface does not send but receives IS-IS packets.

  C. On a broadcast network, if each router supports both IPv4 and IPv6, the IPv4 DIS and IPv6 DIS must be the same device.

  D. By default, the DIS priority of Level-1 and Level-2 broadcast interfaces is 1.

  Correct Answer: A

• Question 39:

  Assuming three routers (A, B, and C) uses BGP as the routing protocol. A sends Update packets to B and B sends the Update packets to C. Which of the following attributes meet the following two conditions? (1) A can select whether to carry this attribute in Update packets.

  (2)

  If B receives an Update packet carrying this attribute, B still advertises the Update packet to C although B cannot identify this attribute. Then, Router C may identify and use this attribute.

  A.

  Multi_Exit_Disc

  B.

  Local_Pref

  C.

  Community

  D.

  Aggregator

  Correct Answer: CD

• Question 40:

  Which of the following statements regarding OSPFv3 Link-LSAs is true?

  A. The Link-LSA contains both the link-local address and all IPv6 prefixes of the interface

  B. The Link-LSA contains both the link-local address of the interface and all IPv6 prefixes of the same area on the router

  C. The Option field exists in an LSA header rather than the data area of a Link-LSA

  D. If the PrefixOptions field of a prefix in the Link-LSA is 0x00, the prefix is not involved in the IPv6 unicast calculation

  Correct Answer: B