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Share Huawei H12-221 HCNP-R&S-IERS Exam Questions and Answers
About the Stub area, full Stub area and NSSA, whichi is correct?
A. The Stub area can only flood Type 3 LSAs, and the full Stub area cannot flood any Type 3 LSA (including the default route LSA).
B. The biggest difference between a fully stub area and a stub area is that cannot flood the Type 3 LSA.
C. Stub area can import AS external routes. The NSSA cannot import AS external routes.
D. Stub areas can flood Type 3 and Type 4 LSAs. Full Stub areas cannot flood Type 3 and Type 4 LSAs (except Type 3 LSAs that advertise default routes).
Answer: B
Which of the following command is used to check Type 2 LAS detailed information?
A. display ospf Isdb network
B. display ip ospf Isdb network
C. display ospf Isdb router
D. display ip ospf Isdb router
Answer: A
About the description of MUX VLAN, which is wrong?
A. Each Group VLAN must have a Principal VLAN bound to it.
B. If the VLAN ID is already used for the principal VLAN, the VLAN can no longer be used for VLANIF interfaces, super VLANs and sub VLANs.
C. After MUX VLAN is enabled on a port, you can use it again for VLAN mapping and VLAN stacking configuration.
D. Enterprises can use the Principal PORT to connect to enterprise servers, separate PORT to connect enterprise customers and Group PORT to connect enterprise employees. In this way, enterprise customers and enterprise employees can access enterprise servers, and internal employees can communicate, enterprise customers cannot communicate, and enterprise customers and enterprise employees cannot communicate with each other.
Answer: C
MSTP is also called multiple spanning tree protocol. What problems can be solved in a single spanning tree network through MSTP? (Multiple Choice)
A. Part of the Vlan path is inaccessible.
B. Unable to use traffic sharing.
C. Suboptimal Layer 2 path.
D. Improve business reliability.
Answer: ABC
The LS Sequence Number is used to detect expired and repeated LSA. It is a 32-bit signed integer, so the maximum LS Sequence Number is 0x7FFFFFFE.
A. True
B. False
Answer: B
The wrong description about OSPF route aggregation is:
A. Route aggregation means to aggregate the routing information of the same prefix and only advertise one route to other areas.
B. Through route aggregation, routing information can be reduced, thereby reducing the size of the routing table and improving the performance of the router.
C. OSPF has two route aggregation modes: ABR aggregation and ASBR aggregation
D. Route aggregation can be performed on any router in OSPF
Answer: D
About the description of connection type of Router-LSA, which is wrong?
A. Point-to-Point describes a point-to-point connection from this router to a neighboring router.
B. TransNet describes the connection from this router to a Transit network segment.
C. StubNet describes a connection from this router to a Stub network segment.
D. P2MP describes the connection from a local router to multiple neighboring routers.
Answer: D
Although the STP protocol can solve the loop problem, the slow convergence of the network topology affects the user communication quality.
RSTP has made many improvements to STP. Which of the following is not an improvement of RSTP to STP?
A. RSTP has deleted 3 kinds of port states and added 2 kinds of port roles.
B. The RSTP port state specification is based on whether the port forwards user traffic and learns the MAC address, reducing the original five port states to three.
C. The non-root switch running RSTP sends configuration BPDUs at the interval specified by the Hello Timer. This behavior is completely performed by each device.
D. If a port does not receive configuration BPDUs from the upstream device within 4 consecutive Hello Time durations, the device considers that negotiation with this neighbor fails.
Answer: D
Compared to STP, the RSTP protocol defines different port states, including Discarding and Learning. About he description of the two port states, the correct is: (Multiple Choice)
A. The ports in these two states do not forward data frames.
B. Ports in Discarding state do not learn the MAC address table.
C. Ports in the Learning state do not learn the MAC address table.
D. All ports in Discarding state and Learning state do not learn MAC address table
Answer: AB
In the same LAN, if some IGMPv1 routers exist in the LAN, IGMPv1 must be forcibly configured for all routers in the subnet to use normally.
A. True
B. False
Answer: A
The matching order of ACL can be out of accordance with sequencing of user configuring the rules for the ACL.
A. True
B. False
Answer: A
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