Huawei Huawei Certifications H12-891 Questions & Answers

• Question 151:

  The following topology diagram is available, and it is correct to analyze the following statement accordingly A. There are route entries for 10022/32 and 10000/16 in the IP routing table for AR1

  

  B. R1's IP routing table has both 10033/32 and 10000/16-bit route entries

  C. Because R does the route aggregation, R1 Only route entries of 10000/16 exist in the IP routing table

  D. There are route entries for 10022/32 and 10033/32 in the IP routing table for R1

  Correct Answer: B

• Question 152:

  In order for routers at both ends of the IPv6 over lPv4 manual tunnel to exchange routing information, OSPV3 can be enabled on the tunnel, osPFv3 will be able to form a normal neighbor relationship, and the tunnel interface will be treated as a P2P link interface.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 153:

  What's wrong about vrrp timers is?

  A. MASTER DOWN = (3*ADVER_ INTERVAL) + Skew_ time

  B. Skew Time= (255-Priority)/255

  C. By default, the time period for VRRP advertisement messages is 2 seconds

  D. By default, the VRRP preemption delay is I seconds

  Correct Answer: BCD

• Question 154:

  The following statement about the application of BFD is correct?

  A. The one-arm echo function refers to the detection of the connectivity of the forwarding link through the loopback operation of the BFD packet

  B. BFD multi-hop detection means that BFD can detect arbitrary paths between two systems that may span many hops or overlap in some parts

  C. BFD and OSPF linkage is to associate BFD and OSPF, and notify OSPF through BFD's rapid sensing of link failures, thereby speeding up OSPF Response to changes in network topology

  D. BFD single-hop detection refers to the IP connectivity detection of two direct-connected systems

  Correct Answer: ABCD

• Question 155:

  Regarding the mpLS handling mode of TTL, is the following description correct?

  A. Pipe mode. When an IP message passes through the MPLS network, the IPTTL minus 1 is mapped to the WLSTTL field at the incoming node.

  B. The TTL in the B. MPLS label has the same meaning as the TTL field in the head. TTL prevents mpLS networks from developing bad routing.

  C. Unifore style, when an IP packet passes through the MPLS network, the IPTTL of the incoming node is minus l. The MPLS TTL field is a fixed value.

  D. In MPLSVPI, if you need to hide the structure of the MPLS backbone network, you can use Uniform mode on Ingress for private network messages .

  Correct Answer: B

• Question 156:

  Is the following description of the OSPFv3 message correct?

  A. The interface ID of the sending interface must be included in the A Hello packet

  B. The LSACK message contains LSA header information to confirm the receipt of LSU packets

  C. The LSR message contains the complete LSA header information for requesting an update to the LSA

  D. Hello messages and the Option field for DD messages extends to 24-bit

  Correct Answer: ABD

• Question 157:

  A campus deploys OSPF to achieve network interoperability, and an engineer configures R2 as shown in the figure, then the following description of the LSA in the OSPF network is wrong

  

  A. There is no Type3 LsA flooding within Areal

  B. There is no Type3 LSA flooding in Area2

  C. There is Type5 LSA flooding within Areal

  D. Area2 contains Type5 LSA generic adverb

  Correct Answer: A

• Question 158:

  Which of the following are single-packet attacks?

  A. Special control message attacks

  B. Scan Probe Attack

  C. DDos Attack

  D. Malformed Message Attack

  Correct Answer: ABD

• Question 159:

  Communityflter has two types of basic group nature filters and advanced group property filters. Which of the following filters makes the Advanced Group Genus Filter more flexible than the Basic Group Attribute Filter to match group attributes?

  A. IP-prefix

  B. AS-path-filter

  C. Regular-expression

  D. ACL

  Correct Answer: C

• Question 160:

  What information does the BGP Open message carry as follows?

  A. BGP Router ID

  B. Route attributes

  C. Local Autonomous System (AS) number

  D. Hold time

  Correct Answer: ACD