Free Huawei H12-891_V1.0-ENU Exam Dumps Questions & Answers

MACsec provides users with secure MAC layer data sending and receiving services.
Which of the following is not a service available by ACsec?

• A.  Integrity check
• B.  Data source authenticity verification
• C.  User data encryption
• D.  Controllability check

The following description of the RD attribute filter for BGP is correct?

• A.  If RD-filter is not configured, but the RD-filter is referenced for filtering, the matching result is deny.
• B.  There is always an "or" relationship between the rules configured by RD-filter.
• C.  If RD-filter is configured, but the routed RD is not matched with any of the RDs defined in the rule, the default match result is permit.
• D.  Multiple rules are matched in the order in which they are configured.

The following description of the LDPLSP establishment process is correct?

• A.  When a network topology change causes the next hop neighbor to change, the free label keep method is used. LSR can quickly rebuild the LSP by directly using the labels sent by the original non-optimal next-hop neighbor. Liberal needs more memory and tag space.
• B.  The process of establishing a LSP is actually to bind the FEC to the tag and advertise this binding to the LSP upstream LSR process.
• C.  In the DoD mode of label publishing, for a specific FEC, the LSR does not need to obtain a label request message from upstream to distribute the label.
• D.  By default, LSRs are for the same FEC, and the received tag mappings can only come from the optimal next hop, not from the non-optimal next hop.

The following description of the characteristics of multi-instance CE is?

• A.  Configuring MCE enables a CE to connect to multiple VPNs at the same time, which can not only completely isolate the service between different VPN users, but also reduce the input cost of network equipment.
• B.  MCE is implemented by creating their own routing forwarding tables for different VPNs on the MCE device and binding to the corresponding interface o
• C.  Since the MCE device is already bound to the VPN, there is no need to bind the VPN on the PE connected to the MCE device
• D.  The MCE device can determine the source of the routing information according to the interface that receives the routing information, and maintain it in the route forwarding table of the corresponding VP.

In ospf broadcast networks, there are 4 routers RTA, RTB, RTC, and RTDs within the same network segment. The DR priorities are 2, 1, 1, and O, and the Router ID is respective 1921681.1, 19216821, 19216831, and 19216841 If the OSPF protocol is enabled on both of these four routers, ospf selects the BDR as

• A.  RTA
• B.  RTD
• C.  RTB
• D.  RTC